217 results on '"ORGANIC dyes"'
Search Results
152. Anthracene‐Bridged Sensitizers for Dye‐Sensitized Solar Cells with 37% Efficiency under Dim Light.
- Author
-
Chen, Ching‐Chin, Nguyen, Vinh Son, Chiu, Hsiao‐Chi, Chen, Yan‐Da, Wei, Tzu‐Chien, and Yeh, Chen‐Yu
- Subjects
- *
DYE-sensitized solar cells , *PHOTOVOLTAIC power systems , *SOLAR cell efficiency , *ORGANIC dyes , *ANTHRACENE derivatives , *PHOTOSENSITIZERS , *OPEN-circuit voltage , *SHORT-circuit currents - Abstract
New anthracene‐bridged organic dyes CXC12 and CXC22 are designed and synthesized for high‐efficiency dye‐sensitized solar cells (DSSCs) under dim light. Compared to their parent dye TY6, CXC dyes have additional anthracene‐acetylene group to extend the π‐conjugation of the molecules, resulting in red‐shifted absorption and an enhanced molar extinction coefficient. The absorption spectra of CXC12 and CXC22 with a maximum located at 561 and 487 nm, respectively, match to those of AM 1.5G sunlight and T5 fluorescent light better than that of TY6 (419 nm). It was initially anticipated that long alkoxyl chains introduced to the 2,6‐position of the bridged anthracenyl in CXC12 will retard charge recombination and dye molecular aggregation, and achieve a higher device open‐circuit voltage. However, adsorption of CXC12 molecules on the photoanode dramatically decrease to less than half as compared to that of CXC22 and TY6, resulting in lower short‐circuit current and thus power conversion efficiency. Among these three anthracene‐based dyes, CXC22 has the most appropriate molecular structure for light harvesting and striking the balance between dye loading and molecular aggregation, to exhibit a remarkable power conversion efficiency as high as 37.07% under dim‐light. Therefore, this work shows the potential of anthracene‐bridged organic dyes for indoor photovoltaic applications. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
153. N‐donor‐induced Two Co(II) Coordination Polymers Derived from the Flexible Citraconic Acid as Photocatalysts for the Decomposition of Organic Dyes.
- Author
-
Li, Gui‐Lian, Yin, Wei‐Dong, Liu, Qian‐Long, Gong, Xiao‐Ru, Zhao, Ya‐Jing, and Liu, Guang‐Zhen
- Subjects
- *
COORDINATION polymers , *ORGANIC dyes , *PHOTOCATALYSTS , *METAL-organic frameworks , *WASTEWATER treatment , *ELEMENTAL analysis - Abstract
Two Co(II) coordination polymers, {[Co(ca)(bpe)(H2O)] ⋅ H2O}n (1) and [Co(ca)(bibp)]n (2) (H2ca=citraconic acid, bpe=1,2‐di(4‐pyridyl)ethylene, bibp=4,4′‐bis(imidazolyl)biphenyl) were prepared by hydrothermal reactions, and characterized by single‐crystal X‐ray diffractions, elemental analysis, FT‐IR, PXRD and TGA. Compound 1 shows a 2D grid layer containing Co‐carboxylate chains. Compound 2 exhibits a three‐dimensional metal‐organic framework with the dia topology type and 66 topology symbol. Both compounds have high thermal stabilities and good phase purity. The photocatalytic reactions of two compounds were investigated under UV irradiation in the presence of H2O2, and the results show that both compounds are highly efficient photocatalysts for MB and RhB degradation, which may be used as potential materials for wastewater treatment. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
154. Water‐Soluble Doubly‐Strapped Isolated Perylene Diimide Chromophore.
- Author
-
Yang, Fei, Li, Ran, Wei, Wei, Ding, Xingwei, Xu, Zhenzhen, Wang, Ping, Wang, Guo, Xu, Yanqing, Fu, Hongbing, and Zhao, Yanli
- Subjects
- *
PHOTOTHERMAL effect , *IMIDES , *RADICAL anions , *ORGANIC dyes , *AQUEOUS solutions , *BISIMIDES , *PERYLENE - Abstract
Perylene diimides (PDIs), a well‐studied class of organic dyes, have a strong tendency to self‐aggregate in water, thus greatly restricting their phototheranostic applications. Herein, we report a water‐soluble PDI cyclophane "Gemini Box" (GBox‐14+), consisting of a central PDI chromophore enclosed by double‐sided cationic molecular straps. Owing to the effective spatial isolation, the chromophore self‐aggregation can be completely eliminated, even in a concentrated aqueous solution up to 2 mM. To our knowledge, GBox‐14+ represents an interesting example of a fluorescent PDI cyclophane in water, capable of being employed for lysosome‐targetable live‐cell imaging. More importantly, the highly concentrated aqueous solution of PDI radical anion can be significantly stabilized by GBox‐14+ to exhibit an excellent near‐infrared photothermal effect, which was further exploited for efficient and selective antibacterial applications. This work provides a new access to water‐soluble non‐aggregated organic dyes and promotes their potential biomedical applications. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
155. Water‐Soluble Doubly‐Strapped Isolated Perylene Diimide Chromophore.
- Author
-
Yang, Fei, Li, Ran, Wei, Wei, Ding, Xingwei, Xu, Zhenzhen, Wang, Ping, Wang, Guo, Xu, Yanqing, Fu, Hongbing, and Zhao, Yanli
- Subjects
- *
PHOTOTHERMAL effect , *IMIDES , *RADICAL anions , *ORGANIC dyes , *AQUEOUS solutions , *BISIMIDES , *PERYLENE - Abstract
Perylene diimides (PDIs), a well‐studied class of organic dyes, have a strong tendency to self‐aggregate in water, thus greatly restricting their phototheranostic applications. Herein, we report a water‐soluble PDI cyclophane "Gemini Box" (GBox‐14+), consisting of a central PDI chromophore enclosed by double‐sided cationic molecular straps. Owing to the effective spatial isolation, the chromophore self‐aggregation can be completely eliminated, even in a concentrated aqueous solution up to 2 mM. To our knowledge, GBox‐14+ represents an interesting example of a fluorescent PDI cyclophane in water, capable of being employed for lysosome‐targetable live‐cell imaging. More importantly, the highly concentrated aqueous solution of PDI radical anion can be significantly stabilized by GBox‐14+ to exhibit an excellent near‐infrared photothermal effect, which was further exploited for efficient and selective antibacterial applications. This work provides a new access to water‐soluble non‐aggregated organic dyes and promotes their potential biomedical applications. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
156. The effects of polar solvents on structural, electronic, and optical properties of organic dyes.
- Author
-
Majid, Abdul, Kiran, Saba, Sandhu, Qurat‐ul‐Ain, Khan, Salahuddin, and Khan, Shaukat
- Subjects
- *
POLAR solvents , *ORGANIC dyes , *OPTICAL properties , *LIGHT absorbance , *MOLECULAR orbitals - Abstract
This study reports first principles investigations on effects of polar solvents acetonitrile, acetone, water, ethanol, and methanol on the structural, electronic, and optical properties of organic dyes named D1, D1A, D1B, and D1C. The solute‐solvent interaction studied via conductor like screening model revealed changes in structural parameters whereas dipole moment of all the dyes increased after immersing in the solvents. The relaxation of dyes structures in the solvents caused stabilization or destabilization of molecular orbitals which is responsible for spectral shifts in UV–visible absorption spectra. The absorbance and light harvesting efficiency of majority of dyes increased upon solvation which shows their suitability to use as sensitizer. The findings suggested that water is not a suitable solvent for the simulated dyes. The efficiency of solvated dyes D1, D1B, and D1C increased but that of D1B is decreased. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
157. Visible‐Light‐Promoted Synthesis of Arylthiopyrimidines through Oxidative Coupling of Pyrimidine Disulfides with Arylhydrazines.
- Author
-
Zhao, Xue‐Jun, Wang, Wen‐Peng, Zhang, Bo‐Sheng, Quan, Zheng‐Jun, and Wang, Xi‐Cun
- Subjects
- *
OXIDATIVE coupling , *TRANSITION metal catalysts , *ORGANIC dyes , *DISULFIDES , *PYRIMIDINES , *SUSTAINABLE chemistry , *MASS spectrometry - Abstract
This report describes the oxidative coupling reaction of dithiopyrimidines with phenylhydrazine hydrochlorides to synthesize a series of arylthiopyrimidine derivatives. The reaction does not require transition metals as catalysts, and uses organic dye rose bengal as photocatalyst and air as oxidant. The reaction conditions are mild and meet the requirements of green chemistry. In addition, the method has a wide scope of substrates and good tolerance of functional groups. The control experiment showed that the reaction may be a free radical mechanism, and the molecular weight of the intermediate was captured by high‐resolution mass spectrometry. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
158. Highly efficient photocatalytic organic dyes degradation based on 1D magnetic Bi2Fe4O9/C@AgBr composite.
- Author
-
Ma, Mingliang, Chen, Yan, Liu, Yanyan, Jiang, Jiabin, Jiao, Zhengguo, and Ma, Yong
- Subjects
- *
WASTEWATER treatment , *RADICAL anions , *VISIBLE spectra , *PHOTOCATALYSTS , *POLYACRYLONITRILES , *POLLUTANTS , *ORGANIC dyes , *METHYLENE blue - Abstract
Wastewater treatment has become a research hot issue in recent decade. Organic dyes as one of the main pollutants can change the water behavior. To deracinate the organic pollutants from wastewater, there are numerous methods have been taken into consideration. Photocatalysis is the promising strategy for the dye degradation with low cost, high efficiency, and environmental friendliness. Hence, a novel one‐dimensional (1D) magnetic Bi2Fe4O9/C@AgBr composite photocatalyst was prepared employing electrospinning, calcination, and deposition–precipitation methods. The morphology and composition of photocatalyst were characterized, as well as the photocatalytic activities of degrading methylene blue (MB) under visible light were investigated. And the results exhibited that the efficiency of Bi2Fe4O9/C@AgBr under visible light for 60 min is 97.4%. After three cycles, the degradation efficiency of MB could still reach 88.0%. Moreover, radical quenching experiment implicated superoxide radical anions as the primary active species responsible for photodegradation of MB. This work provides a new insight into the design of effective photocatalysts for practical application. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
159. Metal‐Organic Frameworks as Unique Platforms to Gain Insight of σ‐Hole Interactions for the Removal of Organic Dyes from Aquatic Ecosystems.
- Author
-
Negro, Cristina, Escamilla, Paula, Bruno, Rosaria, Ferrando‐Soria, Jesus, Armentano, Donatella, and Pardo, Emilio
- Subjects
- *
METAL-organic frameworks , *HOST-guest chemistry , *MOLECULAR recognition , *X-ray crystallography , *ECOSYSTEMS , *POROUS materials , *METHIONINE , *ORGANIC dyes - Abstract
The combination of high crystallinity and rich host‐guest chemistry in metal‐organic frameworks (MOFs), have situated them in an advantageous position, with respect to traditional porous materials, to gain insight on specific weak noncovalent supramolecular interactions. In particular, sulfur σ‐hole interactions are known to play a key role in the biological activity of living beings as well as on relevant molecular recognitions processes. However, so far, they have been barely explored. Here, we describe both how the combination of the intrinsic features of MOFs, especially the possibility of using single‐crystal X‐ray crystallography (SCXRD), can be an extremely valuable tool to gain insight on sulfur σ‐hole interactions, and how their rational exploitation can be enormously useful in the efficient removal of harmful organic molecules from aquatic ecosystems. Thus, we have used a MOF, prepared from the amino acid L‐methionine and possessing channels decorated with −CH2CH2SCH3 thioalkyl chains, to remove a family of organic dyes at very low concentrations (10 ppm) from water. This MOF is able to efficiently capture the four dyes in a very fast manner, reaching within five minutes nearly the maximum removal. Remarkably, the crystal structure of the different organic dyes within MOFs channels could be determined by SCXRD. This has enabled us to directly visualize the important role sulfur σ‐hole interactions play on the removal of organic dyes from aqueous solutions, representing one of the first studies on the rational exploitation of σ‐hole interactions for water remediation. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
160. The Design and Bioimaging Applications of NIR Fluorescent Organic Dyes with High Brightness.
- Author
-
Wu, Jiaxing, Shi, Zhenxiong, Zhu, Linlin, Li, Jie, Han, Xu, Xu, Man, Hao, Shiping, Fan, Yibo, Shao, Tao, Bai, Hua, Peng, Bo, Hu, Wenbo, Liu, Xiaowang, Yao, Chuanhao, Li, Lin, and Huang, Wei
- Subjects
- *
ORGANIC dyes , *FLUORESCENT dyes , *NEAR infrared radiation , *FLUOROPHORES , *TISSUES , *BIOFLUORESCENCE , *FLUORESCENCE - Abstract
Due to the merits of decreased photon attenuation, autofluorescence, and scattering, the near‐infrared (NIR, 700–1700 nm) region is an important window in the field of biomedicine, such as in vivo fluorescence imaging, in which both the optical detection depth and the resolution/contrast have been significantly improved. In particular, for second NIR (NIR‐II, 1000–1700 nm) dyes, biological tissues have almost no background interference. Typical fluorophores have excellent spectral performance and rich functional modification sites and can be optimized into NIR dyes for bioimaging. However, as the absorption/emission wavelength of fluorophores redshift to NIR, it is challenging to keep fluorophores with satisfying brightness. Therefore, for the purpose of increasing the absorption/emission wavelength of dye while promoting its brightness, it is necessary to study the structure–property relationship of the dyes. This review introduces the influences of fluorophores' structure on their photophysical properties, summarizes the strategies for maintaining high fluorescence brightness along with redshifted absorption/emission wavelengths, and the latest advances of highly fluorescent brightness dyes. Finally, the opportunities and challenges in this emerging field are also provided. The authors aim to provide insightful design guidelines and clear overview of highly bright NIR fluorescent dyes, which might trigger new ideas and applications. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
161. Controlling the Dual‐Emission Character of Aryl‐Modified o‐Carboranes by Intramolecular CH⋅⋅⋅O Interaction Sites.
- Author
-
Ochi, Junki, Yuhara, Kazuhiro, Tanaka, Kazuo, and Chujo, Yoshiki
- Subjects
- *
SOLID solutions , *BINDING energy , *EXCITED states , *INTERMOLECULAR interactions , *ORGANIC dyes , *BORON - Abstract
It is still challenging to realize a dual‐emission system, in which two luminescent bands simultaneously appear by photoexcitation, in solid with organic dyes due to the difficulty in regulation of electronic properties in the excited state and concentration quenching. o‐Carborane is known to be a versatile platform for constructing solid‐state emitters since the sphere boron cluster is favorable for suppressing intermolecular interactions and subsequently concentration quenching. Here, we show solid‐state dual‐emissive o‐carborane derivatives. We prepared 4 types of o‐carborane derivatives and found dual‐emission behaviors both in solution and solid states. By regulating the rotation at the o‐carborane unit with the intramolecular CcageH⋅⋅⋅O interaction, the dual‐emission intensity ratios were changed. Finally, it was demonstrated that the overall photoluminescence spectra can be estimated using the binding energy of intramolecular interactions. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
162. Structural Color on Pencil Lead Formed by Plasma Etching.
- Author
-
Moriwaki, Hiroshi, Kamine, Tomoya, Kawabe, Yukari, and Okada, Yusuke
- Subjects
- *
STRUCTURAL colors , *PLASMA etching , *RED , *PENCILS , *POISONS , *ORGANIC dyes , *HEAVY metals - Abstract
The development of a simple and rapid technique to form structural colors would be an important step to achieve the coloring without dyes containing toxic organic dyes or heavy metals. Here, a novel method to form structural color using plasma etching is presented. The structural color is reproducibly formed by the plasma irradiation of the surface of a pencil lead for 40–120 s. The color changes with the plasma irradiation time. The formed colors exhibit a luster and turn blue, yellow, red‐purple, blue, green, or pale red by the plasma irradiation time of 40, 60, 80, 90, 100, and 120 s, respectively. The surface asperities due to the removals of the graphite at the surface of the pencil lead by the plasma etching are changed by the irradiation time. This causes the changes in the structural color of the pencil lead. The coloring by this method can easily control the colored part by using a masking plastic plate. Furthermore, a paper painted with a pencil is also colored by the plasma treatment. The presented method is a simple and rapid technique to form structural colors and can be applied for coloring without dyes. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
163. Construction of crystalline cadmium complex based on 1,4,5,8‐naphthalene diimide derivative and photocatalytic degradation about organic dyes.
- Author
-
Zhang, Xue, Wang, Chen, Wang, Li Yan, Xing, Yong Heng, Bai, Feng Ying, and Shi, Zhan
- Subjects
- *
PHOTODEGRADATION , *CADMIUM compounds , *NAPHTHALENE derivatives , *ORGANIC dyes , *CARBOXYLIC acid derivatives , *IMIDES , *PERYLENE , *MOLECULAR structure - Abstract
The complex [Cd(PDNDI)]·DMF (Cd‐PDNDI) (H2PDNDI = N‐(4‐pyridine)‐4,5‐dicarboxy‐1,8‐naphthalene dicarboxyimide) was synthesized by the reaction of N,N′‐di(4‐pyridyl)‐1,4,5,8‐naphthalene diimide (DPNDI) and Cd(NO3)2·4H2O. It was characterized by elemental analysis, infrared spectroscopy, ultraviolet–visible (UV‐vis) spectroscopy, powder X‐ray diffraction (PXRD), single crystal X‐ray diffraction, and thermogravimetric analysis. Structural analysis shows that the Cd‐PDNDI has a self‐assembled 3D network structure with the rtl type topology. It is worth mentioning that the composition of the ligand is different from the initial raw material used in this molecular structure. This may be because the ligand undergoes an in situ hydrolysis reaction in the reaction system and becomes an NDI carboxylic acid derivative, which continues to join coordination reaction with the metal ion. In addition, the Cd‐PDNDI has an excellent photocatalytic effect on malachite green (MG) among the six dyes, which shows that the Cd‐PDNDI could be used as a photocatalytic material for the degradation of dyes. Highlights: A 3D complex Cd‐PDNDI was synthesized.The Cd‐PDNDI show higher degradation efficiency for MG and can be used as a potential photocatalyst.The possible mechanism of in‐situ reaction of ligands in Cd‐PDNDI is proposed, which provides a reference for the further development of NDI series complexes. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
164. Towards Nitrogen‐Rich N‐Heteropolycycles: Synthesis of Octaazaperopyrenes (OAPP).
- Author
-
Wesp, Tobias, Bruckhoff, Tim, Petry, Julian, Wadepohl, Hubert, and Gade, Lutz H.
- Subjects
- *
RADICAL anions , *FRONTIER orbitals , *ACYL chlorides , *ELECTRON paramagnetic resonance spectroscopy , *OXIDATION-reduction reaction , *DEHALOGENATION - Abstract
Ortho substituted octaazaperopyrenes (OAPPs) are a new class of functional dyes characterized by their strong electron‐accepting behavior. Herein, the synthesis, as well as the electrochemical and photo physical properties of an OAPP dye, is reported. The OAPP target was prepared via selective nucleophilic substitution at the peri position of a bay chlorinated tetraazaperylene by introduction of four amino‐substituents. The resulting tetraminoperylene was reacted with different acyl chlorides and anhydrides to give the twisted bay chlorinated OAPP derivatives which were isolated in their reduced dihydro‐form. The OAPP target could be obtained via a palladium catalyzed dehalogenation and a subsequent oxidation. The eightfold isosteric [CH→N] replacement within the peropyrene core structure results in a large decrease of the frontier orbital energies, rendering the target compound a potent oxidant while preserving the planarity of the aromatic core. The radical anion was obtained by reduction of the OAPP with KC8 and characterized by EPR spectroscopy. A general discussion of the number and location of [CH→N] replacements in peropyrene structures and their frontier orbital energies is provided. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
165. A strategy of designed anionic metal–organic framework adsorbent based on reticular chemistry for rapid selective capture of carcinogenic dyes.
- Author
-
Feng, Meng, Wu, Liang, Wang, Xirong, Wang, Jingyu, Wang, Dongmei, and Li, Chunxia
- Subjects
- *
METAL-organic frameworks , *PHYSISORPTION , *ION exchange (Chemistry) , *DYES & dyeing , *POISONS , *ORGANIC dyes , *COLOR removal in water purification - Abstract
In this work, highly effective and rapid removal of cationic carcinogenic organic dye molecules is achieved through the implementation of a novel anionic metal–organic framework (MOF). Benefit from reticular chemistry, an anionic pts topology‐directed MOF [CH3NH3][In (TPTAB)4]·solvents (In‐TPTAB, H4TPTAB = [1,1′:3′,1″‐terphenyl]‐4,4′,4″,6′‐tetracarboxylic acid) has been solvothermally synthesized. The structural characteristics of high porosity and the large size 1D channel modified by uncoordinated O sites promote In‐TPTAB to be a promising adsorbent material. By ion exchange, In/Cu‐TPTAB exhibits obviously increased BET surface area (248 m2 g−1) compared with In‐TPTAB (55 m2 g−1). More importantly, In‐TPTAB presents commendable performances with the maximum adsorption capacities for toxic dye BR9 and MLB are up to 368 and 304 mg g−1, and the adsorption rates are 10.9 and 6.7 mg g−1 min−1, respectively. It is noteworthy that the high‐efficiency capacity of In‐TPTAB in capturing dyes surpasses many reported adsorbent materials. The mechanism of physical adsorption can be ascribed to the synergistic effect of multiple host‐guest interactions. Coupled with the good recyclable, push In‐TPTAB to be potential used for the removal of cationic organic pollutants [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
166. Acridine Orange Hemi(Zinc Chloride) Salt as a Lewis Acid‐Photoredox Hybrid Catalyst for the Generation of α‐Carbonyl Radicals.
- Author
-
Das, Sanju, Mandal, Tanumoy, and De Sarkar, Suman
- Subjects
- *
ZINC chloride , *ACRIDINE orange , *ALKYL radicals , *CATALYSTS , *LEWIS acids , *ORGANIC dyes , *ELECTROCHEMICAL experiments - Abstract
A readily accessible organic‐inorganic hybrid catalyst is reported for the reductive fragmentation of α‐halocarbonyl compounds. The robust hybrid catalyst is a self‐stabilizing combination of ZnCl2 Lewis acid and acridine orange as the photoactive organic dye. Mechanistic specifics of this hybrid catalyst have been studied in detail using both photophysical and electrochemical experiments. A systematic study enabled the discovery of the appropriate Lewis acid for the effective LUMO stabilization of α‐halocarbonyl compounds and thereby lowering of reduction potential within the range of a standard organic dye. This strategy resolves the issues like dehalogenative hydrogenation or homo‐coupling of alkyl radicals by guiding the photoredox cycle through an oxidative quenching pathway. The cooperativity between the photoactive organic dye and the Lewis acid counterparts empowers functionalization with a wide range of coupling partners through efficient and controlled generation of alkyl radicals and serves as an appropriate alternative to the expensive late transition metal‐based photocatalysts. To demonstrate the application potential of this cooperative catalytic system, four different synthetic transformations of α‐carbonyl bromides were explored with broad substrate scopes. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
167. Electrochemical Synthesis of Graphene from Waste Discharged Battery Electrodes and Its Applications to Preparation of Graphene/Fe3O4/Chitosan‐Nanosorbent for Organic Dyes Removal.
- Author
-
Tran, Huyen Thi Thu, Hoang, Ly Thanh, and Tran, Hoang Vinh
- Subjects
- *
METHYLENE blue , *GRAPHENE synthesis , *ORGANIC dyes , *ADSORPTION capacity , *SCANNING electron microscopy , *ELECTRODES , *RAMAN spectroscopy - Abstract
In this work, graphene was synthesized from waste discharged battery electrodes using an electrochemical exfoliation method. The graphene product was characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy and adsorption activity. For application, as‐synthesized graphene was used for preparation of Fe3O4/graphene/chitosan (FGC) nanocomposite as a recyclable‐nanosorbent for removal of organic dyes including methylene blue (MB), methyl orange (MO), brilliant blue FCF (E133), eriochorome black T (EBT) and thymol blue (ThB) from aqueous solution. The obtained results shown that the FGC adsorbent is more attractive to MB and EBT than other evaluated dyes. At optimized conditions, FGC can adsorb MB at maximum adsorption capacity (qmax) of 94.16 mg g−1 and the remaining adsorption efficiency for the 5th cycle was 74.81 % compared to that of the pristine FGC nanosorbent. Moreover, the FGC nanocomposite was also used to remove MB from real wastewater with high removal efficiency. This performance implies a high application potential of synthesized graphene from waste graphite for environmental treatments. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
168. Photocatalytic Degradation of Organic Dyes with Magnetically Separable PANI/Fe3O4 Composite under Both UV and Visible‐light Irradiation.
- Author
-
Demir, Muslum, Taymaz, Bircan Haspulat, Sarıbel, Muhammet, and Kamış, Handan
- Subjects
- *
ORGANIC dyes , *PHOTODEGRADATION , *POLYANILINES , *MALACHITE green , *IRRADIATION , *WATER reuse - Abstract
The creation of a novel composite photocatalyst has gained great attention in the field of organic dye remediation. Herein, the PANI/Fe3O4 photocatalyst has been prepared using the chemical oxidative polymerization of aniline. The as‐prepared photocatalyst represents a denser and uniform morphology along with strong magnetic properties. The photocatalytic activity of the PANI/Fe3O4 was investigated for the degradation of Malachite Green (MG), Jakazol Kala (JK) and Levafix Red (LR). In the presence of PANI/Fe3O4 composite, the reaction rate constants were found to be 0.1997, 0.0521, and 0.1993 min−1 for MG, JK and LR, under UV‐light irradiation and 0.0522, 0.0491, 0.0544 min−1 under visible light irradiation, respectively. The nanocomposite can be easily separated from the treated water and reused several times. The suppression of electron recombination, the reduced bandgap and the broad light‐harvesting in both UV and visible‐light regions contribute to the advanced photocatalytic performance of the PANI/Fe3O4. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
169. In‐Situ Stabilizing Nano‐Ag onto Nonwoven Fabrics via a Mussel‐Inspired Approach for Continuous‐Flow Catalysis Reduction of Organic Dyes.
- Author
-
Sha, Zhou, Fan, Jiahui, Lu, Jian, He, Huan, Hong, Bo, Fei, Xiang, and Zhu, Meifang
- Subjects
- *
NONWOVEN textiles , *CONTINUOUS flow reactors , *CATALYSIS , *CATALYTIC reduction , *ORGANIC dyes , *CATALYTIC activity , *DIFFUSION - Abstract
A novel nonwoven‐fabric‐supported‐nano‐Ag (NWF/Ag) reactor was obtained via a mussel‐inspired in‐situ fabrication method. The resulting NWF/Ag features a high catalytic activity for the reduction reaction of organic dyes in the presence of sodium borohydride. More importantly, it is also feasible for the scale‐up catalysis in NWF/Ag‐assembled continuous‐flow reactors. Such a NWF/Ag catalyst preserves the fiber‐based three‐dimensional architecture to effectively drive the continuous‐flow catalysis reactions at unprecedented efficiency, benefiting from it the easy diffusion of dye molecules to access the active catalytic sites of nano‐Ag. Moreover, the resulting NWF/Ag composites can serve as versatile platforms to assemble continuous‐flow reactors in different shapes, sizes, and configurations to extend the catalysis applications. In this study, the catalytic reduction conversion of methylene blue can reach more than 98 % in 270 seconds using the NWF/Ag‐based channel‐type continuous‐flow reactor. It also preserves good catalytic reduction performance to other organic dyes, including methyl orange and acid orange 7. The NWF‐based platforms, combined with a rational designed approach of surface functionalization and hybridization, probably provide new insights into the catalytic reduction of organic dyes in a continuous‐flow way. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
170. Hybridization of Nanoclay with a Chromium‐Based Metal‐Organic Framework for Boosting Adsorption of Organic Dyes from Wastewater.
- Author
-
Far, Hossein Shahriyari, Hasanzadeh, Mahdi, Najafi, Mina, and Rahimi, Rahmatollah
- Subjects
- *
ORGANIC dyes , *METAL-organic frameworks , *ADSORPTION kinetics , *ADSORPTION (Chemistry) , *WASTEWATER treatment , *ADSORPTION capacity , *WATER quality management , *WATER purification - Abstract
We demonstrate enhanced dye adsorption capacity of nanoclay by decoration with chromium‐based MOF (MIL‐101) nanostructure. The Clay/Cr‐MOF composite exhibits a crystalline structure with high thermal stability. Moreover, it shows the superior specific surface area (4959 m2/g) and porosity which is beneficial for wastewater treatment. The developed Clay‐MOF composite exhibits superb adsorption capacity toward various organic dyes as compared with existing materials. The adsorption experiments revealed high adsorption capacity and selective dye removal efficiency of MOF‐modified nanoclay with reusability for multiple regeneration cycles. The adsorption kinetics was found to obey the pseudo‐second‐order kinetic model. These findings provide new insights into the application of such porous adsorbents for wastewater treatment applications. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
171. Synthesis and characterization of a new polyoxometalate nanocluster containing Mo and V as an environmentally green catalyst for oxidative degradation of organic pollutants from aquatic environments.
- Author
-
Naslhajian, Hadi, Amini, Mojtaba, Hosseinifard, Mojtaba, Farnia, S. Morteza F., and Janczak, Jan
- Subjects
- *
CATALYSTS , *POLLUTANTS , *X-ray crystallography , *CYCLIC voltammetry , *ORGANIC dyes , *THERMOGRAVIMETRY , *METHYLENE blue - Abstract
A water‐insoluble Keggin‐type polyoxomolybdovanadate nanocluster, (Et4N)4[VMo12O40]·MeCN (1) was synthesized and crystallized in acetonitrile. The catalyst was characterized by X‐ray crystallography, UV–Vis, thermogravimetric analysis (TGA), cyclic voltammetry (CV), and FT‐IR techniques. Degradation of organic dyes, Amido black 10B (AB10B) and Methylene blue (MB) was investigated by 1/H2O2 system at room temperature and the influence of different conditions on the decomposition of AB10B and MB dyes such as catalyst dosage, oxidant concentration, pH, radical scavengers, and reusability of 1 were studied. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
172. Analytical investigation of the original painted canvas of Santa Irene, by Giuseppe Verrio (Church of Sant'Irene, Lecce, Italy)*.
- Author
-
Rizzo, Daniela and Casciaro, Raffaele
- Subjects
- *
CANVAS , *OIL paint , *VARNISH & varnishing , *GAS chromatography/Mass spectrometry (GC-MS) , *ACRYLIC paint , *MONASTICISM & religious orders , *ORGANIC dyes , *PAINT - Abstract
The object of this study is unusual for both its material and technique. It is an oil painting on sheets of paper glued to a canvas made of linen fibres, thereby showing some execution peculiarities. It depicts the Virgin of Thessalonica in a hieratic attitude. The painting is attributed to the Salento‐born artist Giuseppe Verrio (1639) for the church of the Theatine religious Order in Lecce, Italy, in which it is still placed, on the left altar of the transept. To truly understand and appreciate a work of art, it is important to have a basic knowledge of the materials and techniques used by the artist. For a better understanding of the execution techniques and to study the original materials and those that have been added over time, the painting was examined using the following analytical techniques: microscopic examination of cross‐sections, μ‐Raman spectroscopy and pyrolysis gas chromatography‐mass spectrometry (Py‐GC‐MS). The data indicate that Verrio used different earthy, mineral and manufactured pigments, an organic dye used only on the paper, oil as a binder, and varnish as a protectant. The results demonstrate that the latter are both original and due to a subsequent restoration. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
173. Micro‐structural Analysis and Photocatalytic Properties of Green Synthesized t‐ZrO2 Nanoparticles.
- Author
-
Sikdar, Suranjan, Banu, Afroja, Ali, Salim, Barman, Subhodeep, Kalar, Pankaj Lal, and Das, Rahul
- Subjects
- *
RIETVELD refinement , *METHYLENE blue , *SCANNING electron microscopes , *BAND gaps , *CRYSTAL structure , *CYCLODEXTRINS , *ORGANIC dyes - Abstract
Tetragonal zirconia (t‐ZrO2) nanoparticles (NPs) were successfully synthesized by a green method using β‐cyclodextrin as stabilizer. The structural characterization of the prepared nanoparticles was done by X‐ray diffraction (XRD).The tetragonal crystalline structure of ZrO2 NPs was confirmed by XRD analysis. We employed the Rietveld method to refine the XRD data and the refinement result leads to specify the tetragonal phase of ZrO2 NPs with space group P 42/n m c. The FTIR spectrum gives the information about the presence of Zr−O bonding at 501 cm−1. Particle size and morphological properties were demonstrated by Scanning Electron Microscope (SEM) and elemental compositions were analysed using EDAX spectrum. The band gap energy was estimated using optical absorption spectroscopy and the value was found to be 3.99 eV. The UV (310 nm) and visible (401, 420 and 560 nm) emissions were observed from PL spectrum. Brunauer‐Emmet‐Teller (BET) surface analysis was used for determining the surface area and average pore size of ZrO2 NPs.The photocatalytic degradation of the prepared ZrO2 NPs for organic dyes had been studied under visible light irradiation. Results showed that 68 % degradation was achieved within 135 min for Methylene Blue (MB) dye but other dyes almost remains unchanged during the same reaction times. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
174. Synthesis of Amphiphilic Silica with High Exposure of Surface Groups and Its Utilization in Efficient Removal of Organic Dyes from Aqueous Solution.
- Author
-
Yang, Yuanyuan, Qiu, Zhenhao, Weng, Guoying, Wang, Huibin, Li, Yanshuo, Fan, Benhan, Bai, Xiu, Zhang, Qiaohong, and Chen, Chen
- Subjects
- *
AQUEOUS solutions , *CONGO red (Staining dye) , *ORGANIC dyes , *ADSORPTION capacity , *SILICA , *LIPOPHILICITY - Abstract
Amphiphilic silica is synthesized with the simultaneous introduction of two kinds of polar and weakly polar organic groups on its surface using a one‐step reverse‐phase microemulsion method. The obtained materials present as nanospheres with a size of ≈100 nm. A high percentage (≈80%) of silicon species can be exposed and the amount of surface SiOH increased by above 50% with the introduction of organic groups. Plenty of groups, including polar groups (3‐aminopropyl and hydroxyl) and weakly polar group (n‐propyl) coexisting on the surface, enable the material to show amphiphilicity. This amphiphilic material can show an excellent property for the removal of various organic dyes from the aqueous solution, and the maximum adsorption capacity of Congo Red, Acid Blue 25, Reactive Blue 19, and Reactive Black 5 can reach 2453.1, 1157.7, 964.6, and 916.9 mg g−1, respectively. Good reusability is also realized for the present amphiphilic material, which can be reused for at least three times. The reported work provides a successful example to prove that the surface hydrophilicity and lipophilicity can be simultaneously improved just through a simple introduction of certain organic groups, and then realize efficient removal of dyes from the polluted water. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
175. High trans‐2‐Decalones by Photoredox Catalyzed β‐Isomerization.
- Author
-
Sombret, Juliette, Quintaine, Julie, Biremond, Tony, Barnes, Quentin, de Saint‐Laumer, Jean‐Yves, and Saudan, Lionel
- Subjects
- *
ABSTRACTION reactions , *ORGANIC dyes , *IRIDIUM - Abstract
The synergistic combination of three catalytic processes – photoredox, enamine and hydrogen atom transfer (HAT) catalysis – enabled the β‐isomerization of 2‐decalones towards the thermodynamically most stable trans‐isomers. A library of iridium (III) complexes and organic dyes were screened in combination with cyclic amines and thiols which after optimization gave the desired trans‐2‐decalones with high trans/cis ratios of 60 : 40 up to 98 : 2. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
176. Macrocycle‐Based Crystalline Sponge that Stabilizes and Lights Up Cationic Aggregation‐Caused Quenching Dyes.
- Author
-
Sun, Xin, Yang, Yu‐Dong, Chen, Xu‐Lang, Sun, Ai‐Huan, Xiang, Jun‐Feng, and Gong, Han‐Yuan
- Subjects
- *
BASIC dyes , *LIGHT emitting diodes , *ORGANIC dyes , *DYE lasers , *FLUORESCENT dyes , *DYES & dyeing - Abstract
Solid‐state fluorescent materials play a critical role in the manufacture of light‐emitting diodes, laser dyes, storage materials, and fluorescence sensors. However, it remains challenging to produce solid‐state fluorescent materials using traditional organic dyes since most are subject to aggregation‐caused quenching (ACQ) in the solid state. Here, a macrocycle‐derived crystalline framework is reported that captures various cationic test‐ACQ dyes (e.g., Basic Red 2 (BR2)) and stabilizes them in a fluorescent form. Cyclo[3](1,3‐benzene)[3](4,6‐benzene)(1,3‐dicarboxylic acid), CA‐3, is used as the core macrocyclic building block. When allowed to coordinate with Zn(NO3)2•6H2O or Cd(NO3)2•4H2O, crystalline sponge (CS‐Zn or CS‐Cd) is obtained. In the case of CS‐Zn, nano‐sized cavities are observed in the solid state that serve as containers to capture the cationic ACQ dye BR2 with loading yields up to 14.6 wt% and emission enhancements up to 41× of those seen for solid BR2. The resulting dye‐containing material, CS‐Zn@BR2, displays high stability in water or selected organic solvents at room temperature or under reflux, or when heated at 300 °C for 1 h open to the air, or in the presence of sodium hypochlorite solution (3.0 mm). This study highlights a new strategy for rendering fluorescent ACQ dyes in the solid state. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
177. Unveiling the Unique Roles of Metal Coordination and Modulator in the Polymorphism Control of Metal‐Organic Frameworks.
- Author
-
Li, Zi‐Jian, Ju, Yu, Zhang, Zeya, Lu, Huangjie, Li, Yongxin, Zhang, Ningjin, Du, Xian‐Long, Guo, Xiaofeng, Zhang, Zhi‐Hui, Qian, Yuan, He, Ming‐Yang, Wang, Jian‐Qiang, and Lin, Jian
- Subjects
- *
METAL-organic frameworks , *ORGANIC dyes , *METALS , *EMPIRICAL research , *POROSITY - Abstract
Polymorphism control of metal‐organic frameworks is highly desired for elucidating structure‐property relationships, but remains an empirical process and is usually done in a trial‐and‐error approach. We adopted the rarely used actinide cation Th4+ and a ditopic linker to construct a series of thorium‐organic frameworks (TOFs) with a range of polymorphs. The extraordinary coordination versatility of Th4+ cations and clusters, coupled with synthetic modulation, gives five distinct phases, wherein the highest degree of interpenetration (threefold) and porosity (75.9 %) of TOFs have been achieved. Notably, the O atom on the capping site of the nine‐coordinated Th4+ cation can function as a bridging unit to interconnect neighboring secondary building units (SBUs), affording topologies that are undocumented for other tetravalent‐metal‐containing MOFs. Furthermore, for the first time HCOOH has been demonstrated as a bridging unit of SBUs to further induce structural complexity. The resulting TOFs exhibit considerably different adsorption behaviors toward organic dyes, thus suggesting that TOFs represent an exceptional and promising platform for structure‐property relationship study. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
178. Luminescent Metal–Organic Frameworks for White LEDs.
- Author
-
Tang, Ying, Wu, Hailong, Cao, Wenqian, Cui, Yuanjing, and Qian, Guodong
- Subjects
- *
METAL-organic frameworks , *POROSITY , *LIGHT emitting diodes , *QUANTUM dots , *RARE earth metals , *LUMINESCENCE , *ORGANIC dyes , *PHOTOLUMINESCENCE - Abstract
Phosphor‐converted white light‐emitting diodes (pc‐WLEDs), as a main approach of solid‐state white light illumination, have caught tremendous attention and achieved enormous progress in the past decades. Since the phosphor plays a dominating role in the final property of pc‐WLEDs, the exploration for high‐performance phosphor has become a challenging and targeted research topic. In this regard, metal–organic frameworks (MOFs) are emerging to offer a fascinating platform for well color‐tuning flexibility and designability endowed by their diversified architectures, devisable pore structures and affluent luminescent centers. In this review, the design strategies of achieving high‐performance phosphor with the doping of luminescent lanthanide ions, organic ligands, and diverse luminescent guest species including organic dyes, metal complexes, quantum dots in MOF matrix are highlighted, and the representative advances in the development of MOF phosphor are presented, providing guidance and reference for further research of phosphor for pc‐WLEDs. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
179. Cryptomelane nanorods coated with Ni ion doped Birnessite polymorphs as bifunctional efficient catalyst for the oxygen evolution reaction and degradation of organic contaminants.
- Author
-
Gürbüz, Mustafa Ulvi, Elmacı, Gökhan, Zhang, Yajun, Meng, Xu, and Ertürk, Ali Serol
- Subjects
- *
OXYGEN evolution reactions , *POLLUTANTS , *CATALYSTS , *METHYLENE blue , *NANORODS , *IONS , *ORGANIC dyes , *DYE-sensitized solar cells - Abstract
The intelligent design or development of dual‐functional catalysts using non‐precious metals especially for the oxygen evolution reaction (OER) in sustainable energy systems and degradation of organic pollutants is still a difficult and a significant challenge. Furthermore, the development of these catalysts is of great importance in terms of energy security and solution of the environmental problems. To meet these requirements, herein, we describe the synthesis of a Ni‐ion doped Birnessite@Cryptomelane (Ni2+/B@Cr) hybrid structure as a bifunctional efficient catalyst for the OER in neutral media and degradation of dye pollutants. The Ni2+/B@Cr catalyst exhibited a sharp onset potential at 390 mV (vs. RHE) and achieved a current density of 1 mA cm−2 at a low ƞ of 430 mV with a Tafel slope of ~96 mV dec−1. The results of electrochemical impedance spectroscopy (EIS) studies indicated that Ni intercalation into birnessite layer and heterostructure of the hybrid electrocatalyst Ni2+/B@Cr increased the conductivity by lowering the resistance of charge transfer (Rct = 4.82 Ω) and oxygen evolution processes (ROER = 4.13 Ω). The durability assay identified Ni2+/B@Cr as stable electrocatalyst with 10% loss of activity after long‐term stability tests (10 h, under 500‐mV overpotential). In addition, the Ni2+/B@Cr achieved high (86.67 s−1 g−1) and rapid (173 s) catalytic performance for the reduction of methylene blue (MB). Overall, this paper presents a low‐cost production strategy for the design of highly efficient bifunctional catalysts, offering boosted electrocatalytic and degradation performance for water oxidation and organic dye contamination, respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
180. Highly effective selectively removal of carcinogenic dyes and iodine adsorption and release via a metal–organic framework based on multiple helical chains.
- Author
-
Yu, Xin, Liu, Mengfan, Feng, Lijuan, Yao, Shuo, and Liu, Yunling
- Subjects
- *
METAL-organic frameworks , *IODINE , *ADSORPTION (Chemistry) , *FLUORESCEIN , *COORDINATION polymers , *ORGANIC dyes , *DYES & dyeing - Abstract
A novel porous metal–organic framework Cu‐BCPPy based on a desymmetrized heterofunctional ligand 3,5‐di(4‐carboxyphenyl)pyridine has been successfully synthesized under solvothermal conditions. The framework possesses two sizes of 2D straight channels, which are constructed by one pair and three pairs of helixes, respectively. The distortion of the ligand leads to the structure exhibiting a new type of (3,6)‐connected topology. According to the structural characteristic, Cu‐BCPPy can effectively adsorb large carcinogenic organic dyes sudan III (SD III) and direct black 38 (DB 38) but exclude small molecular dyes. Hence, Cu‐BCPPy exhibits effective and selective adsorption performance for the carcinogenic dye DB 38 on the equal proportional mixture dyes methyl orange (MO) and DB 38, fluorescein and DB 38, and basic red 2 (BR 2) and DB 38 with different sizes. In addition, Cu‐BCPPy can be also provided with the characteristic of high iodine adsorption and release, which indicates that it is a promising candidate material for selectively adsorption and separation of many substances. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
181. Emerging Design Principle of Near‐Infrared Upconversion Sensitizer Based on Mitochondria‐Targeted Organic Dye for Enhanced Photodynamic Therapy.
- Author
-
Tian, Ruisong, Wang, Chao, Chi, Weijie, Fan, Jiangli, Du, Jianjun, Long, Saran, Guo, Lianying, Liu, Xiaogang, and Peng, Xiaojun
- Subjects
- *
PHOTODYNAMIC therapy , *PHOTOSENSITIZERS , *PHOTON upconversion , *ORGANIC dyes , *MULTIPHOTON absorption , *DYE-sensitized solar cells - Abstract
Upconversion luminescent (UCL) triggered photodynamic therapy (PDT) affords superior outcome for cancer treatment. However, conventional UCL materials which all work by a multiphoton absorption (MPA) process inevitably need extremely high power density far over the maximum permissible exposure (MPE) to laser. Here, a one‐photon absorption molecular upconversion sensitizer Cy5.5‐Br based on frequency upconversion luminescent (FUCL) is designed for PDT. The unusual super heavy atom effect (SHAE) in Cy5.5‐Br strongly enhances its spin‐orbit coupling (0.23 cm−1), triplet quantum yield (11.1 %) and triplet state lifetime (18.8 μs) while the potential hot‐band absorption of Cy5.5‐Br is well maintained. Importantly, Cy5.5‐Br can efficiently target the tumour site and kill cancer cells by destroying mitochondria under a biosafety MPE to 808 nm laser. The photostability and antitumor results are obviously superior to that of a Stokes process. This work provides a design criterion for FUCL dyes to realize effective PDT upon a biosafety optical density, possibly bringing more clinical benefits than conventional MPA materials. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
182. Analysis of photoaging characteristics of Chinese traditional pigments and dyes in different environments based on color difference principle.
- Author
-
Zhao, Zining, Zhang, Peng, Liu, Xianming, Lei, Xiaohua, and Luo, Yun
- Subjects
- *
PIGMENTS , *ORGANIC dyes , *LIGHT sources , *NATURAL dyes & dyeing , *FLUORESCENT lamps , *DYES & dyeing , *ATMOSPHERIC nitrogen - Abstract
Photocatalytic oxidation is one of the main factors leading to the aging damage of Chinese traditional dyes and pigments. In this study, in order to analyze the photoaging characteristics of traditional dyes and pigments commonly used in Chinese cultural relics in different environments, we used traditional Chinese painting pigments to make colored paper samples, and used traditional dye extraction and dyeing technology to make colored silk samples. By setting up nitrogen and atmospheric chamber and using LED, tungsten halogen lamp, metal halide lamp and fluorescent lamp as light sources, an accelerated photoaging contrast test on 16 kinds of dyes and pigments was carried out, and then the color difference of different samples in different light environment and atmosphere environment was obtained. Through systematic analysis, the results show that the type of light source and the gas environment will affect the photoaging rate of the samples. The nitrogen environment can significantly reduce the degree and speed of photoaging, especially for organic dyes and pigments. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
183. Engineering DNA‐Grafted Quatsomes as Stable Nucleic Acid‐Responsive Fluorescent Nanovesicles.
- Author
-
Rossetti, Marianna, Stella, Lorenzo, Morlà‐Folch, Judit, Bobone, Sara, Boloix, Ariadna, Baranda, Lorena, Moscone, Danila, Roldán, Mònica, Veciana, Jaume, Segura, Miguel F., Köber, Mariana, Ventosa, Nora, and Porchetta, Alessandro
- Subjects
- *
SURFACE charges , *DNA probes , *ORGANIC dyes , *ENGINEERING , *POLYMERSOMES , *MICRORNA , *NUCLEIC acids , *TRANSDUCERS - Abstract
The development of artificial vesicles into responsive architectures capable of sensing the biological environment and simultaneously signaling the presence of a specific target molecule is a key challenge in a range of biomedical applications from drug delivery to diagnostic tools. Herein, the rational design of biomimetic DNA‐grafted quatsome (QS) nanovesicles capable of translating the binding of a target molecule to amphiphilic DNA probes into an optical output is presented. QSs are synthetic lipid‐based nanovesicles able to confine multiple organic dyes at the nanoscale, resulting in ultra‐bright soft materials with attractiveness for sensing applications. Dye‐loaded QS nanovesicles of different composition and surface charge are grafted with fluorescent amphiphilic nucleic acid‐based probes to produce programmable FRET‐active nanovesicles that operate as highly sensitive signal transducers. The photophysical properties of the DNA‐grafted nanovesicles are characterized and the highly selective, ratiometric detection of clinically relevant microRNAs with sensitivity in the low nanomolar range are demonstrated. The potential applications of responsive QS nanovesicles for biosensing applications but also as functional nanodevices for targeted biomedical applications is envisaged. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
184. Temperature‐Controlled Conversion of Boc‐Protected Methylene Blue: Advancing Solid‐State Time‐Temperature Indicators.
- Author
-
Merkes, Jean Michel and Banala, Srinivas
- Subjects
- *
FOOD packaging , *ORGANIC dyes , *PRODUCT quality - Abstract
Cold‐chain management is of high importance in preserving perishable products and in retaining quality. A visible marker on packages indicating complete maintenance of the cold chain assures safe consumption of products by end‐users and assists in reducing waste. Time‐temperature indicators (TTIs) are integrated markers that provide information about exposure of packages to adverse temperature and have been gaining increased attention by consumers. Here we present a methylene‐blue‐based derivative, N,N,N′,N′‐tetramethyl‐N10‐Boc‐phenothiazine‐3,7‐diamine (BocPTDA), that can be used as a solid‐state organic TTI dye, exhibiting an irreversible change from colorless to blue green upon heating. The conversion properties, studied using a silicagel‐coated plate, confirmed that BocPTDA undergoes a color change above 20 °C. At temperatures of 4 °C and below, no visible changes are exhibited, making BocPTDA a well‐suited marker for monitoring abrupt temperature deviations indicating improper cold‐chain management. Thus, application of BocPTDA‐based TTI systems on packages could inform consumers about the cold‐chain maintenance, assuring quality and safe consumption. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
185. Direct Photoexcitation of Ethynylbenziodoxolones: An Alternative to Photocatalysis for Alkynylation Reactions**.
- Author
-
Amos, Stephanie G. E., Cavalli, Diana, Le Vaillant, Franck, and Waser, Jerome
- Subjects
- *
AROMATIC amines , *TERTIARY amines , *VISIBLE spectra , *ORGANIC dyes , *IMINES , *OXALATES , *PHOTOCATALYSIS , *PHOTOEXCITATION - Abstract
Ethynylbenziodoxolones (EBXs) are commonly used as radical traps in photocatalytic alkynylations. Herein, we report that aryl‐substituted EBX reagents can be directly activated by visible light irradiation. They act as both oxidants and radical traps, alleviating the need for a photocatalyst in several reported EBX‐mediated processes, including decarboxylative and deboronative alkynylations, the oxyalkynylation of enamides and the C−H alkynylation of THF. Furthermore, the method could be applied to the synthesis of alkynylated quaternary centers from tertiary alcohols via stable oxalate salts and from tertiary amines via aryl imines. A photocatalytic process using 4CzIPN as an organic dye was also developed for the deoxyalkynylation of oxalates. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
186. Direct Photoexcitation of Ethynylbenziodoxolones: An Alternative to Photocatalysis for Alkynylation Reactions**.
- Author
-
Amos, Stephanie G. E., Cavalli, Diana, Le Vaillant, Franck, and Waser, Jerome
- Subjects
- *
AROMATIC amines , *TERTIARY amines , *VISIBLE spectra , *ORGANIC dyes , *IMINES , *OXALATES , *PHOTOCATALYSIS , *PHOTOEXCITATION - Abstract
Ethynylbenziodoxolones (EBXs) are commonly used as radical traps in photocatalytic alkynylations. Herein, we report that aryl‐substituted EBX reagents can be directly activated by visible light irradiation. They act as both oxidants and radical traps, alleviating the need for a photocatalyst in several reported EBX‐mediated processes, including decarboxylative and deboronative alkynylations, the oxyalkynylation of enamides and the C−H alkynylation of THF. Furthermore, the method could be applied to the synthesis of alkynylated quaternary centers from tertiary alcohols via stable oxalate salts and from tertiary amines via aryl imines. A photocatalytic process using 4CzIPN as an organic dye was also developed for the deoxyalkynylation of oxalates. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
187. Rational Fabrication of Multiple Dimensional Assemblies from Tryptophan‐Based Racemate.
- Author
-
Zhang, Yaqian, Qin, Minggao, Xing, Chao, Zhao, Changli, Dou, Xiaoqiu, and Feng, Chuanliang
- Subjects
- *
ORGANIC dyes , *ENANTIOMERS , *SUPRAMOLECULAR chemistry , *NANOFIBERS , *PHASE transitions , *MIXTURES , *RACEMIC mixtures - Abstract
Fabricating structural complex assemblies from simple amino acid‐based derivatives is attracting great research interests due to their easy accessibility and preparation. However, the morphological regulation of racemates (an equimolar mixture of enantiomers) were largely overlooked. In this work, through rational modulation of kinetic and thermodynamic parameters, we achieved multiple dimensional architectures employing tryptophan‐based racemate (RPWM). Upon assembling, 1D bundled nanofibers, 2D lamellar nanostructure and 3D urchin‐like microflowers could be obtained depending on the solvents used. The corresponding morphology evolutions were successfully illustrated by changing the enantiomeric excess (ee) value. Moreover, for RPWM, uniform 0D nanospheres were formed in H2O under 4 °C, which could spontaneously convert into lamella under ambient temperature. Taking advantages of its temperature‐responsive phase change behavior, RPWM assemblies exhibited excellent removal efficiency for organic dye RhB, and could be reused for several consecutive cycles without significant changes in its removal performance. Taken together, it's rational to envision that the engineering of racemates assembly pathways can greatly increase the robustness in a wide variety of supramolecular materials and further lead to their blooming versatile applications. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
188. Fabrication of Highly Catalytically Active Gold Nanostructures on Filter‐Paper and Their Applications towards Degradation of Environmental Pollutants.
- Author
-
Khan, Ghazanfar Ali, Esentürk, Emren Nalbant, Bek, Alpan, Bhatti, Arshad Saleem, and Ahmed, Waqqar
- Subjects
- *
POLLUTANTS , *ENVIRONMENTAL degradation , *NANOSTRUCTURES , *FILTER paper , *GOLD nanoparticles , *GOLD mining - Abstract
Supported metallic nanoparticles (NPs) have recently become a promising candidate for the degradation of environmental pollutants. In this work, we report the fabrication of highly catalytically active, surfactant‐free interconnected Au nanostructures directly on filter paper. The width of nanostructures is only a few nanometers and they contain high concentration of low‐coordination atoms. Our approach involves the immersion and evaporation of Au precursor solution on the filter paper and its subsequent reduction. This approach generates filter paper‐based gold substrates (FPGS) not only in a simple and straightforward fashion that can be executed in a matter of minutes but can also be easily scaled up for large‐scale production. Owing to their surfactant‐free nature, FPGS are well suited for the degradation of both cationic and anionic dyes by providing large unhindered surface for dye adsorption. The FPGS were able to completely degrade methyl orange (MO) and methylene blue (MB) dyes and also showed excellent reusability and stability. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
189. Mechanochromic Luminescence (MCL) of Purely Organic Two‐Component Dyes: Wide‐Range MCL over 300 nm and Two‐Step MCL by Charge‐Transfer Complexation.
- Author
-
Ito, Suguru, Sekine, Ryohei, Munakata, Masayasu, Yamashita, Maho, and Tachikawa, Takashi
- Subjects
- *
ORGANIC dyes , *LUMINESCENCE , *FLUORESCENCE microscopy , *STIMULUS intensity , *FLUOROPHORES , *ANTHRAQUINONES - Abstract
Despite recent extensive studies on mechanochromic luminescence (MCL), rational control over the magnitude of the emission‐wavelength shift in response to mechanical stimuli remains challenging. In the present study, a two‐component donor‐acceptor approach has been applied to create a variety of organic MCL composites that exhibit remarkable emission‐wavelength switching. Dibenzofuran‐based bis(1‐pyrenylmethyl)diamine and typical organic fluorophores have been employed as donor and acceptor dyes, respectively. Outstanding wide‐range MCL with an emission‐wavelength shift of over 300 nm has been achieved by mixing the diamine with 3,4,9,10‐perylenetetracarboxylic diimide. Unprecedented two‐step MCL in response to mechanical stimuli of different intensity has also been realized for a two‐component mixture with 9,10‐anthraquinone. Fluorescence microscopy observations at the single‐particle level revealed that the segregation and mixing of the two‐component dyes contribute to the stimuli‐responsive emission‐color switching of the MCL composites. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
190. Bulk and Surface‐Mediated Polymorphs of Bio‐Inspired Dyes Organic Semiconductors: The Role of Lattice Phonons in their Investigation.
- Author
-
Salzillo, Tommaso, Giunchi, Andrea, Pandolfi, Lorenzo, Brillante, Aldo, and Venuti, Elisabetta
- Subjects
- *
PHONONS , *ORGANIC dyes , *ORGANIC semiconductors , *MOLECULAR spectroscopy , *THIN films , *RAMAN spectroscopy , *CHARGE carrier mobility - Abstract
Raman spectroscopy of organic molecular materials in the low‐wavenumber region gives access to lattice vibrational modes and to the wealth of information on solid state properties that these can provide. In the field of organic electronics a useful application concerns the discrimination of the crystalline forms i. e. polymorphism of the semiconductor. The capability of characterizing and identifying the polymorphs of a compound is in fact the prerequisite for an exhaustive study of the charge transport characteristics which arise from the relationship between molecular, electronic, and crystal structures. Thus, the need is felt of a non‐invasive, non‐destructive tool such as Raman, which probes the crystal phase by detecting the lattice modes which are sensitive even to subtle variations of the packing. Here we review the contribution of the technique to the study of organic pigments displaying promising semiconducting properties and characterized by polymorphism both in their bulk and thin film phases. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
191. Pyrrole/thiophene π‐bridged two triphenylamine electron donor and substituted thiobarbituric electron acceptor for D‐π‐A‐D‐featured DSSC applications.
- Author
-
Mersal, Gaber A. M., Toghan, Arafat, Yahia, Ibrahim S., and El‐Sheshtawy, Hamdy S.
- Subjects
- *
THIOPHENES , *ELECTRON donors , *ELECTROPHILES , *PYRROLES , *TRIPHENYLAMINE , *ORGANIC dyes , *DENSITY functional theory , *PHOTOSENSITIZERS - Abstract
We designed a series of organic dyes based on two triphenylamine units (electron donors), pyrrole/thiophene (π‐bridge) and N‐substituted alkyl thiobarbituric acid (electron acceptors) to construct the D‐π‐A‐D photosensitizer systems. The electronic structures and photophysical properties of the sensitizers were investigated by density functional theory (DFT) and time‐dependent DFT (TD‐DFT). The potential use of the dyes as photosensitizers in DSSCs was explored by calculating the light harvesting efficiency (LHE), electrons driving force injection (ΔGinject), the open‐circuit photovoltage (VOC), and surface interaction with semiconductor (TiO2). From alkyl‐substituted sensitizers, N‐ethyl derivatives TPAA3 and TPAB3 performance for ΔGinject (−1.69 and −1.65 eV) and VOC (1.43, and 1.11 eV) was superior to the other dyes. In addition, the anchoring ability of the N‐substituted alkyl derivatives was higher than the cyanoacrylic dyes. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
192. A Simple Effective Δ SCF Method for Computing Optical Gaps in Organic Chromophores.
- Author
-
Roy, Raj, Ghosal, Abhisek, and Roy, Amlan K.
- Subjects
- *
OPTICAL computing , *CHROMOPHORES , *POLYCYCLIC aromatic hydrocarbons , *SMALL molecules , *ACENES , *ORGANIC dyes , *DELAYED fluorescence - Abstract
Photoluminescence effects in organic chromophores are of significant importance and requires precise description of low lying excited states. In this communication, we put forward an alternative time‐independent DFT scheme for computing lowest single‐particle excitation energy, especially for singlet excited state. This adopts a recently developed "virial"‐theorem based model of singlet‐triplet splitting which requires a DFT calculation on closed shell ground state and a restricted open‐shell triplet excited state, followed by a simple 2e- integral evaluation. This produces vertical excitation energies in small molecules, linear and non‐linear polycyclic aromatic hydrocarbon and organic dyes in comparable accuracy to the TDDFT. We also explore the functional dependency of present method with three different functionals (B3LYP, wB97X and CAM‐B3LYP) for polyenes and linear acenes. A systematic comparison with literature value illustrates the validity and usefulness of the present scheme in determining optical gap with fair computational cost. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
193. Visible‐Light‐Induced Homolysis of Earth‐Abundant Metal‐Substrate Complexes: A Complementary Activation Strategy in Photoredox Catalysis.
- Author
-
Abderrazak, Youssef, Bhattacharyya, Aditya, and Reiser, Oliver
- Subjects
- *
HOMOLYSIS , *CATALYSIS , *PRECIOUS metals , *ENERGY transfer , *ORGANIC dyes - Abstract
The mainstream applications of visible‐light photoredox catalysis predominately involve outer‐sphere single‐electron transfer (SET) or energy transfer (EnT) processes of precious metal RuII or IrIII complexes or of organic dyes with low photostability. Earth‐abundant metal‐based MnLn‐type (M=metal, Ln=polydentate ligands) complexes are rapidly evolving as alternative photocatalysts as they offer not only economic and ecological advantages but also access to the complementary inner‐sphere mechanistic modes, thereby transcending their inherent limitations of ultrashort excited‐state lifetimes for use as effective photocatalysts. The generic process, termed visible‐light‐induced homolysis (VLIH), entails the formation of suitable light‐absorbing ligated metal–substrate complexes (MnLn‐Z; Z=substrate) that can undergo homolytic cleavage to generate Mn−1Ln and Z. for further transformations. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
194. Organic Semiconducting Macromolecular Dyes for NIR‐II Photoacoustic Imaging and Photothermal Therapy.
- Author
-
Yin, Chao, Li, Xiaozhen, Wang, Yi, Liang, Yuying, Zhou, Shan, Zhao, Pengchao, Lee, Chun‐Sing, Fan, Quli, and Huang, Wei
- Subjects
- *
ACOUSTIC imaging , *PHOTOTHERMAL conversion , *DYES & dyeing , *STEM cells , *ORGANIC dyes , *PHOTOACOUSTIC spectroscopy , *PHOTOACOUSTIC effect - Abstract
Owing to the unique advantages of photoacoustic imaging (PAI) and photothermal therapy (PTT) conducted over the near‐infrared‐II (NIR‐II) window, the development of high‐efficiency optical agents with NIR‐II light responsiveness is of great significance. Despite the diversity of optical agents developed for NIR‐II PAI and PTT, most of them are based on inorganic nanomaterials and small molecular dyes, whose biosafety and photostability need to be further assessed, respectively. Organic semiconducting macromolecular dyes (OSMDs) featuring a large semiconducting backbone are becoming alternative candidates for NIR‐II PAI and PTT owing to their reliable biocompatibility, durable photostability, and ideal photothermal conversion capability. This paper reviews the current progress of OSMD‐based PAI and PTT in the NIR‐II optical window. The three main types of OSMDs with different skeleton architectures are introduced, and their applications for NIR‐II PAI (tumor imaging, stem cell tracking, and vasculature imaging) and PTT (tumor ablation) are described. Viable strategies for further improving the NIR‐II PAI performance of OSMDs are discussed. Finally, some major issues faced by OSMDs in NIR‐II PAI and PTT are raised, and the future development directions of OSMDs are analyzed. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
195. Designing All‐Inorganic EuO‐Sensitized TiO2 Solar Cell from 4f‐3d Composite Bandgap Structure.
- Author
-
Wang, Qian, Zhu, Wenxuan, Pan, Feng, and Song, Cheng
- Subjects
- *
PHOTONIC band gap structures , *DYE-sensitized solar cells , *PHOTOELECTROCHEMICAL cells , *ORGANIC dyes , *SPINTRONICS , *PHOTOSENSITIZERS - Abstract
TiO2 dye‐sensitized solar cells (DSSCs) have blazed a new trail out of traditional silicon‐based photovoltaics. However, extensive applications of DSSCs are limited by the use of organic photosensitizers and liquid electrolytes, which raises strict requirements on dye synthesis and cell encapsulation. Considering the electron‐donating tendency and optical activity of Eu2+, EuO semiconductor is chosen as inorganic substitution of organic dyes based on Eu2+↔Eu3+ redox transition. Through first‐principle calculations, 4f‐3d composite bandgap is found in TiO2/EuO heterostructure, reducing the bandgap of pure TiO2 from 3.2 to 0.99 eV. This energy corresponds to near‐infrared photon and thus covers the whole range of visible light, which will significantly enhance the light‐absorption efficiency of TiO2. Similar electronic feature also appears in ATiO3 (A = Sr, Ba)/EuO interfaces. The bandgap value is critically dependent on bonding type and geometry structure of TiO6 octahedra at the interface. On this basis, all‐inorganic EuO‐sensitized TiO2 solar cell is theoretically designed, where EuO serves as photosensitizer to replace dye molecules and inject electrons into TiO2 anode under light excitation. This finding not only provides prospect for all‐inorganic DSSCs, but also sheds light on high‐efficiency TiO2‐based photocatalysis and EuO‐relevant spintronics with rich interfacial physics. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
196. Activating Room‐Temperature Phosphorescence of Organic Luminophores via External Heavy‐Atom Effect and Rigidity of Ionic Polymer Matrix**.
- Author
-
Yan, Zi‐Ang, Lin, Xiaohan, Sun, Siyu, Ma, Xiang, and Tian, He
- Subjects
- *
CONDUCTING polymers , *LUMINOPHORES , *PHOSPHORESCENCE , *ORGANIC dyes , *QUATERNARY ammonium salts , *IONIC bonds - Abstract
Pure organic room‐temperature phosphorescence (RTP) materials have attracted wide attention for their easy preparation, low toxicity, and applications in various fields like bioimaging and anti‐counterfeiting. Developing phosphorescent systems with more universality and less difficulty in synthesis has long been the pursuit of materials scientists. By employing a polymeric quaternary ammonium salt with an ionic bonding matrix and heavy atoms, commercial fluorescent dyes are directly endowed with phosphorescence emission. In a single amorphous polymer, the external heavy‐atom effect generates excited triplet states and the rigid polymer matrix stabilizes them. This study put forward a new general strategy to design and develop pure organic RTP materials starting from existing library of organic dyes without complicated chemical synthesis. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
197. Synthesis of BiOBr/Mg metal organic frameworks catalyst application for degrade organic dyes rhodamine B under the visible light.
- Author
-
Lou, Weiyi, Wang, Liying, Zhang, Yongfeng, and Xing, Yu
- Subjects
- *
METAL-organic frameworks , *VISIBLE spectra , *RHODAMINE B , *X-ray photoelectron spectroscopy , *ORGANIC dyes , *SCANNING electron microscopes - Abstract
A series of binary composite photo‐catalyst BiOBr/MgBTC (the ligand of MgBTC is 1, 3, 5‐benzenetricarboxylate = H3BTC) with different content of BiOBr have been designed and used to degrade the traditional dye rhodamine B (RhB). As‐prepared binary composites have been first obtained via a simple hydrothermal system and subsequently deposited onto the BiOBr substrates. The composites exhibited better catalytic performance compared with the pristine BiOBr, and the performance of BM‐55 (synthesized by 0.55 mmol BiOBr and 0.45 mmol MgCl2•6H2O) was the most efficient and its removal rate of RhB can reach 98.3% within 60 min. The composite photo catalyst was characterized by X‐ray diffraction (XRD), infrared (IR), scanning electron microscope (SEM), X‐ray photoelectron spectroscopy (XPS), diffuse reflectance spectroscopy (DRS), photoluminescence (PL), and electrochemical impedance spectroscopy (EIS), respectively. In the free radical trapping experiments, it can be seen that the main photo‐catalytic active species are superoxide radicals (•O2−) and holes (h+). This work can provide considerable opportunities to the development of various metal–organic frameworks (MOF)‐based visible light photo‐catalysts and modified 2D bismuth ox halide materials (BiOX) for use in environmental cleaning application. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
198. Activating Room‐Temperature Phosphorescence of Organic Luminophores via External Heavy‐Atom Effect and Rigidity of Ionic Polymer Matrix**.
- Author
-
Yan, Zi‐Ang, Lin, Xiaohan, Sun, Siyu, Ma, Xiang, and Tian, He
- Subjects
- *
CONDUCTING polymers , *LUMINOPHORES , *PHOSPHORESCENCE , *ORGANIC dyes , *QUATERNARY ammonium salts , *IONIC bonds - Abstract
Pure organic room‐temperature phosphorescence (RTP) materials have attracted wide attention for their easy preparation, low toxicity, and applications in various fields like bioimaging and anti‐counterfeiting. Developing phosphorescent systems with more universality and less difficulty in synthesis has long been the pursuit of materials scientists. By employing a polymeric quaternary ammonium salt with an ionic bonding matrix and heavy atoms, commercial fluorescent dyes are directly endowed with phosphorescence emission. In a single amorphous polymer, the external heavy‐atom effect generates excited triplet states and the rigid polymer matrix stabilizes them. This study put forward a new general strategy to design and develop pure organic RTP materials starting from existing library of organic dyes without complicated chemical synthesis. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
199. 2,9‐Diazadibenzoperylene and 2,9‐Dimethyldibenzoperylene‐1,3,8,10‐tetratriflates: Key to Functionalized 2,9‐Diazaperopyrenes.
- Author
-
Baal, Eduard, Klein, Marius, Harms, Klaus, and Sundermeyer, Jörg
- Subjects
- *
PERYLENE , *BAND gaps , *IMIDES , *ORGANIC dyes - Abstract
The synthesis of 2,9‐diaza‐1,3,8,10‐tetratriflato‐dibenzoperylene (DDP 3 a) and corresponding 2,9‐dimethyl‐1,3,8,10‐tetratriflato‐dibenzoperylene (DBP 3 b) has been developed at multigram scale via reduction of one of the industrially most important high‐performance dyes, perylene‐3,4,9,10‐tetracarboxylic diimide (PTCDI), and of the corresponding dihydroxy peropyrenequinone precursor. The focus of this paper is on the reactivity pattern of 3 a as key intermediate towards highly functionalized 2,9‐diazadibenzopyrelenes (DDPs) obtained via catalytic substitution of four triflate by aryl, heteroaryl, alkynyl, aminyl, and O‐phosphanyl substituents. The influence of electron‐donating substituents (OSiMe3, OPt‐Bu2, N‐piperidinyl), electron‐withdrawing (OTf, 3,5‐bis‐trifluoromethyl‐phenyl), and of electron‐rich π‐conjugated (2‐thienyl, 4‐tert‐butylphenyl, trimethylsilyl‐ethynyl) substituents on optoelectronic and structural properties of these functionalized DDPs has been investigated via XRD analyses, UV/Vis, PL spectroscopy, and by electroanalytical CV. These results were correlated to results of DFT and TD‐DFT calculations. Thus, functionalized DPPs with easily tunable HOMO and LUMO energies and gap became available via a new and reliable synthetic strategy starting from readily available PTCDI. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
200. New Hybrid Fe‐based MOFs/Polymer Composites for the Photodegradation of Organic Dyes.
- Author
-
Brahmi, Chaima, Benltifa, Mahmoud, Vaulot, Cyril, Michelin, Laure, Dumur, Frédéric, Gkaniatsou, Effrosyni, Sicard, Clémence, Airoudj, Aissam, Morlet‐Savary, Fabrice, Bousselmi, Latifa, and Lalevée, Jacques
- Subjects
- *
ORGANIC dyes , *DYNAMIC mechanical analysis , *METAL-organic frameworks , *PHOTODEGRADATION , *PHOTOCATALYSTS , *POLYMERS , *ATOMIC force microscopy - Abstract
Metals Organic Frameworks (MOFs) are promising crystalline, embrittled materials generally produced in powdering form with varied remarkably functionalities. In contrary, polymers are flexible and processable materials. Therefore, obtaining shaped solids gathering polymer malleability and MOFs properties such as their photocatalytic activities, have attracted many researchers' attention. This work, reports the successful fruitful incorporation of two different Fe‐based MOFs into a polymer matrix via a facile and cheap photopolymerization process upon mild visible light irradiation at 405 nm. The as‐prepared photocomposites display excellent stability and photocatalytic performance for several Acid Black degradation cycles. Hence, approximatively, 95 % of this model dye is decomposed by the two MIL‐100(Fe)/polymer and MIL‐88 A(Fe)/polymer composites under just 30 min of UV‐Visible lamp irradiation. Incorporation of the MOFs into the polymer is confirmed by several techniques including Scanning Electron Microscopy (SEM), Energy‐Dispersive X‐ray analysis (EDX), Transmission Electron Microscopy (TEM), X‐ Ray Diffraction analysis (DRX), Fourier‐Transform Infrared Spectroscopy (FTIR). Furthermore, these photocatalysts exhibit a high thermal stability, excellent rigidity and low band gap energy characterized by Thermogravimetric Analysis (TGA), Atomic Force Microscopy (AFM), Dynamic Mechanical Analysis (DMA) and UV‐Visible diffuse reflectance spectroscopy, respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.