566 results on '"Maochun Hong"'
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2. Highly Efficient White-Light Emission Induced by Carboxylic Acid Dimers in a Layered Hybrid Perovskite
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Wentao Wu, Junhua Luo, Dong Li, Shisheng Lin, Chengmin Ji, Maochun Hong, and Lina Li
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chemistry.chemical_classification ,chemistry.chemical_compound ,Metal halides ,Materials science ,chemistry ,Intermolecular interaction ,Carboxylic acid ,High color ,White light ,General Chemistry ,Photochemistry ,Rendering (computer graphics) ,Perovskite (structure) - Abstract
Broadband white-light emission in metal halides has been intensely explored because of their facile solution processability, structural adjustability, and high color rendering index. However, the m... more...
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- 2022
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3. 2D van der Waals Layered [C(NH2)3]2SO3S Exhibits Desirable UV Nonlinear-Optical Trade-Off
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Zheyao Xiong, Junhua Luo, Sangen Zhao, Bin-Wen Liu, Maochun Hong, Xiaomeng Liu, Lina Li, Jinlong Xu, Zheshuai Lin, and Youchao Liu
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Birefringence ,Chemistry ,Second-harmonic generation ,Molecular physics ,Ion ,Inorganic Chemistry ,Crystal ,Wavelength ,symbols.namesake ,Absorption edge ,symbols ,Physical and Theoretical Chemistry ,van der Waals force ,Anisotropy - Abstract
It remains a challenge to develop UV nonlinear optical (NLO) crystals that can achieve a desirable trade-off on UV absorption edge, second harmonic generation (SHG), and birefringence. Here we report a thiosulfate UV NLO crystal of a 2D van der Waals layered structure, [C(NH2)3]2SO3S. Remarkably, this thiosulfate realizes the desired trade-off, with a short absorption edge of 254 nm, a strong SHG response of approximately 2.8 times that of the benchmark KH2PO4, and a sufficient birefringence of 0.073 at the wavelength of 546 nm. In addition, it exhibits strong in-plane anisotropy of the SHG intensity. According to the first-principles calculations, the non-π-conjugated [SO3S]2- anion is the dominant SHG functional gene, while the π-conjugated [C(NH2)3]+ cation serves as the functional gene of birefringence. This is different from common UV NLO materials whose functionals of SHG and birefringence are the same. These findings indicate that combining different function genes may be an effective strategy to develop outstanding NLO materials with the desirable property trade-off. more...
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- 2021
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4. Activating Surface Dark Emitters in Lanthanide-Doped Ultrasmall Nanoparticles for Biological Applications Based on Interparticle Energy Transfer
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Rui Feng, Huhui Fu, Feilong Jiang, Yongsheng Liu, and Maochun Hong
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Lanthanide ,chemistry.chemical_compound ,Materials science ,chemistry ,Energy transfer ,Doping ,Nanoparticle ,Nanotechnology ,General Chemistry ,Scandium oxide - Abstract
Lanthanide-doped ultrasmall nanoparticles (NPs) are attractive for diverse applications because of their unique optical properties compared with their bulk materials; their practical use, however, ... more...
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- 2021
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5. A Nonlinear Optical Switchable Sulfate of Ultrawide Bandgap
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Xiaojun Kuang, Qingran Ding, Maochun Hong, Congling Yin, Xiaoyan Yang, Lunhua He, Sangen Zhao, Yanqiang Li, Junhua Luo, and Jie Chen
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Phase transition ,Nonlinear optical ,chemistry.chemical_compound ,Materials science ,chemistry ,Band gap ,business.industry ,Optoelectronics ,General Chemistry ,Sulfate ,business - Abstract
Nonlinear optical (NLO) switchable materials have attracted intense attention because of their promising applications in optoelectronic devices. However, previous studies are mainly limited to mole... more...
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- 2021
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6. Engineering Oxygen Vacancies in Mesocrystalline CuO Nanosheets for Water Oxidation
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Jiayue Tian, Ke-Yu Niu, Maochun Hong, Xiao-Lu Wang, Xian-Ming Zhang, Linjie Zhang, Linfeng Liang, and Kang Zhou
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Materials science ,Chemical engineering ,chemistry ,chemistry.chemical_element ,General Materials Science ,Oxygen - Published
- 2021
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7. Study on a novel fluorescent anti-counterfeiting acrylate pressure-sensitive adhesive
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Xia Wang, Heqing Fu, Kai Zhang, Xiaochen Yu, Qihui Chen, Maochun Hong, and Zhaoxi Zhou
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010407 polymers ,Acrylate ,Materials science ,Surfaces and Interfaces ,General Chemistry ,01 natural sciences ,Fluorescence ,0104 chemical sciences ,Surfaces, Coatings and Films ,chemistry.chemical_compound ,Monomer ,chemistry ,Mechanics of Materials ,Polymer chemistry ,Pressure sensitive ,Materials Chemistry ,Adhesive - Abstract
In this paper, a kind of fluorescent anti-counter feiting acrylate pressure-sensitive adhesive (PSA) label was prepared using 7-hydroxycoumarin and acrylate monomer. First,7-hydroxycoumarin was rea... more...
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- 2021
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8. Chiral ligands for palladium-catalyzed asymmetric C–H activation
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Yu Du, Yongliang Huang, Maochun Hong, Yue Gao, Weiping Su, and Hui Shen
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Phosphoramidite ,Denticity ,General Chemical Engineering ,Chiral ligand ,Enantioselective synthesis ,Total synthesis ,General Chemistry ,Planar chirality ,Biochemistry ,Combinatorial chemistry ,chemistry.chemical_compound ,chemistry ,Materials Chemistry ,Molecule ,Bifunctional - Abstract
Chiral ligands enabled palladium-catalyzed regio- and enantioselective C–H activation represents one of the current frontiers in transition metal catalysis. It has been extensively developed over the past decade as an important method for the synthesis of chiral molecules. Functional molecules bearing central, axial or planar chirality can be efficiently generated in good to excellent optical purities through this method. It has also been used as one of the most efficient methods for the rapid construction of various C–C and C–X bonds. In this review, we highlight the development of some representative chiral ligands in Pd-catalyzed enantioselective C(sp2)–H and C(sp3)–H functionalization reactions. Specifically, critical features of these novel Pd-catalyzed transformations assisted by chiral ligands such as monodentate phosphoramidites, chiral phosphoric acids (CPAs) and bifunctional mono-N-protected amino acids (MPAAs) will be discussed. The recent advances and limitations in this rapidly growing research area and its application in the total synthesis of natural products and pharmaceutical molecules will also be presented and discussed. more...
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- 2021
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9. Spacer Cation Alloying of a Homoconformational Carboxylate trans Isomer to Boost in-Plane Ferroelectricity in a 2D Hybrid Perovskite
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Junhua Luo, Xiao-Ying Huang, Shiguo Han, Maochun Hong, Wuqian Guo, Yu Ma, Zhihua Sun, Yi Liu, and Jiaqi Wang
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Chemistry ,General Chemistry ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Ferroelectricity ,Catalysis ,0104 chemical sciences ,chemistry.chemical_compound ,Crystallography ,symbols.namesake ,In plane ,Colloid and Surface Chemistry ,symbols ,Carboxylate ,van der Waals force ,Cis–trans isomerism ,Perovskite (structure) - Abstract
Two-dimensional (2D) hybrid perovskites of Ruddlesden–Popper (RP) lattices are recently booming as a vigorous class of ferroelectrics, whereas their intrinsic van der Waals gaps exert weak interact... more...
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- 2021
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10. An ultra-stable microporous supramolecular framework with highly selective adsorption and separation of water over ethanol
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Jiandong Pang, Zhengyi Di, Falu Hu, Maochun Hong, and Mingyan Wu
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Ethanol ,Chemistry ,Supramolecular chemistry ,02 engineering and technology ,Microporous material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Molecular sieve ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,chemistry.chemical_compound ,Adsorption ,Chemical engineering ,Molecule ,General Materials Science ,Thermal stability ,Methanol ,Electrical and Electronic Engineering ,0210 nano-technology - Abstract
A microporous supramolecular framework with high water and thermal stability can selectively absorb water molecules over methanol or ethanol due to the suitable channels. The model separation test on columns shows that an ultra-pure ethanol (99.9%) can be obtained from the mixture of ethanol/water (95:5). Additionally, after refluxing the desolvated sample in 95% ethanol at 60 °C for 5 h, the purity of ethanol rises up to 97.43%, which is obviously higher than 96.56% for 4 A molecular sieves. more...
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- 2021
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11. A reduced-dimensional polar hybrid perovskite for self-powered broad-spectrum photodetection†
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Maochun Hong, Wentao Wu, Junhua Luo, Lina Li, Yu Peng, Dong Li, Xitao Liu, Xiaoqi Li, and Shiguo Han
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Materials science ,business.industry ,Band gap ,Photovoltaic system ,General Chemistry ,Photodetection ,Anomalous photovoltaic effect ,Broad spectrum ,Chemistry ,Polar ,Optoelectronics ,business ,Realization (systems) ,Perovskite (structure) - Abstract
Polar hybrid perovskites have been explored for self-powered photodetection benefitting from prominent transport of photo-induced carriers and the bulk photovoltaic effect (BPVE). However, these self-powered photodetection ranges are relatively narrow depending on their intrinsic wide bandgaps (>2.08 eV), and the realization of broad-spectrum self-powered photodetection is still a difficult task. Herein, we successfully obtained a polar multilayered perovskite, (I-BA)2(MA)2Pb3I10 (IMP, MA+ = methylammonium and I-BA+ = 4-iodobutylammonium), via rational dimension reduction of CH3NH3PbI3. It features the narrowest bandgap of 1.71 eV in a BPV material. As a consequence, the integration of narrow bandgap and BPVE causes the self-powered photodetection to extend to 724 nm for IMP, and a repeatable photovoltaic current reaching 1.0 μA cm−2 is acquired with a high “on/off” ratio of ∼103 and photodetectivity (∼109 Jones) at zero bias. This innovative research provides a foothold for adjusting the physical properties of hybrid perovskites and will expand their potential for self-powered broad-spectrum detection., A polar hybrid perovskite with a wide-spectrum absorption extending to 724 nm was obtained . Benefitting from the narrow bandgap and bulk photovoltaic effects, self-powered broad-spectrum photodetection was achieved in hybrid perovskites. more...
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- 2021
12. Simultaneous fluorescence and phosphorescence in Zn(<scp>ii</scp>)–zwitterionic coordination polymers with tunable colors
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Chenglin Shu, Maochun Hong, Cheng Chen, Caiping Liu, and Mingyan Wu
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chemistry.chemical_classification ,Materials science ,Ligand ,General Chemistry ,Polymer ,Electron ,Photochemistry ,Fluorescence ,Metal ,chemistry ,visual_art ,Materials Chemistry ,visual_art.visual_art_medium ,Isostructural ,Luminescence ,Phosphorescence - Abstract
Three similar ionic-type ligands which can provide ligand-centred charge transfer (LCCT) have been employed to synthesize three isostructural complexes, respectively. Due to the coordination of the ligands to the metal centres, all of the above mentioned complexes feature fluorescence and phosphorescence properties simultaneously. The mechanism of the luminous process is ligand-centred charge transfer (LCCT) combined with metal-to-ligand charge transfer (MLCT) processes. More interestingly, one compound manifests tunable colors from yellow to blue emissions involving white emission by varying the temperature and/or excitation wavelength directly. Experimental and computational results indicate that the differences in luminous properties originate from the ligand distortion combined with different electron states. Thus, this study provides a facile method to synthesize new single-component tunable-color luminescent coordination polymers with simultaneous fluorescence and phosphorescence. more...
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- 2021
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13. Soft Perovskite-Type Antiferroelectric with Giant Electrocaloric Strength near Room Temperature
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Zhihua Sun, Shiguo Han, Yi Liu, Maofan Li, Maochun Hong, and Junhua Luo
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Condensed matter physics ,Chemistry ,Refrigeration ,General Chemistry ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Catalysis ,0104 chemical sciences ,Dipole ,Colloid and Surface Chemistry ,Antiferroelectricity ,Antiparallel (electronics) ,Perovskite (structure) - Abstract
Antiferroelectric materials, characterized by an antiparallel array of adjacent dipoles, are holding a bright future for solid-state refrigeration based on their electrocaloric (EC) effects. Despite great advances of inorganic oxides and some organic soft polymers, their EC effects are achieved under quite high electric fields that result in too low EC strengths for practical application. Currently, it is a challenge to exploit soft antiferroelectric with strong EC strengths. Here, by the mixed-cation alloying, we present a new perovskite-type soft antiferroelectric, (isopentylammonium) more...
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- 2020
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14. Acid–Base-Resistant Metal–Organic Framework for Size-Selective Carbon Dioxide Capture
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Dong Wu, Jiayue Tian, Qihui Chen, Caiping Liu, Daqiang Yuan, Maochun Hong, and Feilong Jiang
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chemistry.chemical_classification ,Flue gas ,Base (chemistry) ,010405 organic chemistry ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences ,Inorganic Chemistry ,chemistry.chemical_compound ,chemistry ,Biogas ,Chemical engineering ,Carbon dioxide ,Metal-organic framework ,Physical and Theoretical Chemistry ,Size selective ,Porous medium - Abstract
The development of practical porous materials for the selective capture of CO2 from flue gas and crude biogas is highly critical for both environment protection and energy safety. Here, a novel met... more...
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- 2020
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15. Precisely Embedding Active Sites into a Mesoporous Zr-Framework through Linker Installation for High-Efficiency Photocatalysis
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Hong-Cai Zhou, Peng Zhang, Daqiang Yuan, Mingyan Wu, Shuai Yuan, Zhengyi Di, Christina T. Lollar, Jiandong Pang, Jun-Sheng Qin, Maochun Hong, and Jialuo Li
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Chemistry ,Nanotechnology ,General Chemistry ,Microporous material ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Catalysis ,0104 chemical sciences ,Colloid and Surface Chemistry ,Photocatalysis ,Embedding ,Mesoporous material ,Expansive ,Linker - Abstract
The pore engineering of microporous metal-organic frameworks (MOFs) has been extensively investigated in the past two decades, and an expansive library of functional groups has been introduced into various frameworks. However, the reliable procurement of MOFs possessing both a targeted pore size and preferred functionality together is less common. This is especially important since the applicability of many elaborately designed materials is often restricted by the small pore sizes of microporous frameworks. Herein, we designed and synthesized a mesoporous MOF based on Zr more...
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- 2020
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16. Biodegradable Inorganic Upconversion Nanocrystals for In Vivo Applications
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Na Wu, Maochun Hong, Fuyou Li, Feilong Jiang, Lixiang Ye, Pengfei Peng, Yongsheng Liu, and Wei Feng
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Chemistry ,Upconversion luminescence ,General Engineering ,General Physics and Astronomy ,02 engineering and technology ,Biodegradation ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Fluorescence ,Photon upconversion ,0104 chemical sciences ,Nanocrystal ,In vivo ,Biophysics ,General Materials Science ,0210 nano-technology ,Biological imaging - Abstract
Lanthanide-doped inorganic upconversion nanocrystals (UCNCs) are promising as fluorescent diagnostic and therapeutic agents for in vivo applications ranging from biological imaging to disease theranostics. However, all currently available lanthanide-doped inorganic UCNCs are not biodegradable and thus cannot be harmlessly eliminated from the body of living organism during a reasonable period of time, making their clinical translations nearly impossible. Here, we report a class of red-emitting biodegradable UCNCs based on Yb3+/Er3+-doped inorganic potassium heptafluozirconate (K3ZrF7:Yb/Er) that features a dynamically "soft" crystal lattice containing water-soluble [ZrF7]3- cluster and a K+ cation. The red-emitting K3ZrF7:Yb/Er UCNCs exhibit a pH-dependent biodegradation capability upon exposure to water both in vitro and in vivo, and the rapid biodegradation rate, monitored using the intrinsic red upconversion luminescence, can be tuned particularly in a mild acidic tumor microenvironment (pH ∼5-6). More importantly, the final biodegradation products of K3ZrF7:Yb/Er UCNCs can be excreted from the body of mice in a short period of time with no evidence of toxicity, in stark contrast to the nondegradable β-NaYF4:Yb/Er UCNCs that primarily accumulate in the main organs of mice. These findings described here unambiguously would benefit the future biomedical applications and clinical translations of lanthanide-doped inorganic UCNCs. more...
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- 2020
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17. Designing a Deep-UV Nonlinear Optical Fluorooxosilicophosphate
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Junhua Luo, Qingran Ding, Lina Li, Zheshuai Lin, Shuai Liu, Yusong Wang, Sangen Zhao, Yanqiang Li, Xiaomeng Liu, and Maochun Hong
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Hexacoordinate ,chemistry.chemical_element ,Nonlinear optics ,General Chemistry ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Piezoelectricity ,Ferroelectricity ,Catalysis ,0104 chemical sciences ,Pyroelectricity ,Colloid and Surface Chemistry ,chemistry ,Chemical physics ,Caesium ,Fluorine ,Moiety - Abstract
Structures composed of SiOxF6-x (x = 1, 2, 3, 4, 5) or SiOxF4-x (x = 1, 2, 3) species have thus far been observed in only a few compounds, and their functional properties are completely unknown in silicate chemistry. By introducing the least electronegative element, cesium, and the most electronegative element, fluorine, into the silicophosphate system, we successfully designed the first noncentrosymmetric fluorooxosilicophosphate with Si-F bonds, CsSiP2O7F, whose structure consists of an unprecedented SiP2O10F moiety containing hexacoordinate SiO5F species. The experimental results highlight CsSiP2O7F as the first fluorooxosilicophosphate deep-UV nonlinear optical (NLO) material. The first-principles calculations reveal that the SiP2O10F moiety is a new type of NLO-active unit and that both cesium and fluorine increase the deep-UV transparency of CsSiP2O7F. This work provides a new source of deep-UV NLO materials and insights into obtaining noncentrosymmetric structures that are indispensable to functional materials in nonlinear optics, piezoelectricity, ferroelectric, pyroelectricity, etc. more...
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- 2020
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18. Multilayered 2D Cesium‐Based Hybrid Perovskite with Strong Polarization Sensitivity: Dimensional Reduction of CsPbBr 3
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Yi Liu, Jiaqi Wang, Maochun Hong, Junhua Luo, Shiguo Han, Maofan Li, Zhiyun Xu, Wuqian Guo, Zhihua Sun, and Xitao Liu
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Photocurrent ,010405 organic chemistry ,business.industry ,Chemistry ,Organic Chemistry ,Nanowire ,General Chemistry ,Photodetection ,Dichroism ,010402 general chemistry ,Polarization (waves) ,01 natural sciences ,Catalysis ,0104 chemical sciences ,Crystal ,Optoelectronics ,business ,Anisotropy ,Perovskite (structure) - Abstract
3D perovskite CsPbBr3 has recently taken a blooming position for optoelectronic applications. However, due to the lack of natural anisotropy of optical attributes, it is a great challenge to fulfil polarization-sensitive photodetection. Here, for the first time, we exploited dimensionality reduction of CsPbBr3 to tailor a 2D-multilayered hybrid perovskite, (TRA)2 CsPb2 Br7 (1, in which TRA is (carboxy)cyclohexylmethylammonium), serving as a potential polarized-light detecting candidate. Its unique quantum-confined 2D structure results in intrinsic anisotropy of electrical conductivity, optical absorbance, and polarization-dependent responses. Particularly, it exhibits remarkable dichroism with the photocurrent ratio (Ipc /Ipa ) of ≈2.1, being much higher than that of the isotropic CsPbBr3 crystal and reported CH3 NH3 PbI3 nanowire (≈1.3), which reveals its great potentials for polarization-sensitive photodetection. Further, crystal-based detectors of 1 show fascinating responses to the polarized light, including high detectivity (>1010 Jones), fast responding time (≈300 μs), and sizeable on/off current ratios (>104 ). To our best knowledge, this is the first study on 2D Cs-based hybrid perovskite exhibiting strong polarization-sensitivity. The work highlights an effective pathway to explore new polarization sensitive candidates for hybrid perovskites and promotes their future electronic applications. more...
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- 2020
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19. An Unprecedented Antimony(III) Borate with Strong Linear and Nonlinear Optical Responses
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Zheshuai Lin, Junhua Luo, Qingran Ding, Lina Li, Shuai Liu, Maochun Hong, Sangen Zhao, Yanqiang Li, Youchao Liu, and Xiaomeng Liu
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Work (thermodynamics) ,Birefringence ,Materials science ,010405 organic chemistry ,Closed system ,chemistry.chemical_element ,General Medicine ,General Chemistry ,010402 general chemistry ,01 natural sciences ,Molecular physics ,Catalysis ,0104 chemical sciences ,Wavelength ,Nonlinear optical ,Antimony ,chemistry ,Boron ,Lone pair - Abstract
Antimony(III) borates with a stereochemical active lone pair remained unknown, although the first antimony borate was reported more than twenty years ago. Now, the first antimony(III) borate in a closed system is successfully synthesized, namely SbB3 O6 . Remarkably, SbB3 O6 not only exhibits an exceptional linear optical response, that is, birefringence of Δn=0.290 at the wavelength of 546 nm, which is the largest among borates, but also has a strong nonlinear optical response of 3.5 times larger than the benchmark KH2 PO4 , exceeding those of most borates. Theoretical calculations reveal that the coexistence of strong linear and nonlinear optical responses in SbB3 O6 should be attributable to the synergistic effect of π-conjugated B-O anionic groups and Sb3+ with stereochemically active lone pair. This work provides a new class of optical bi-functional materials with potential prospects in integrated optical devices. more...
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- 2020
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20. Tin-Doped Near-Infrared Persistent Luminescence Nanoparticles with Considerable Improvement of Biological Window Activation for Deep Tumor Photodynamic Therapy
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Junpeng Shi, Xia Sun, Liang Song, Shenghui Zheng, Yun Zhang, Maochun Hong, Tobias Madl, Hongwu Zhang, and Fangrong Zhang
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Materials science ,medicine.medical_treatment ,Biochemistry (medical) ,Photothermal effect ,Doping ,Near-infrared spectroscopy ,Biomedical Engineering ,Nanoparticle ,chemistry.chemical_element ,Photodynamic therapy ,General Chemistry ,Photochemistry ,body regions ,Biomaterials ,Persistent luminescence ,chemistry ,medicine ,Irradiation ,Tin - Abstract
The photodynamic therapy (PDT) as a promising antitumor therapy technique is greatly hampered by the low tissue penetration of light and the photothermal effect of prolonged irradiation. Near-infrared (NIR) persistent luminescence nanoparticles (NPLNPs) possess the potential for application in next-generation PDT. However, owing to the low re-excitation efficiency of NPLNPs in deep tissue, the current PDT nanoplatform based on NPLNPs is faced with the disadvantage of decreased PDT efficiency induced by persistent luminescence (PersL) decay at the lesion site. Herein, NPLNPs, Zn more...
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- 2022
21. Centimeter-Sized Single Crystal of a One-Dimensional Lead-Free Mixed-Cation Perovskite Ferroelectric for Highly Polarization Sensitive Photodetection
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Weichuan Zhang, Junhua Luo, and Maochun Hong
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business.industry ,Chemistry ,General Chemistry ,Dielectric ,Dichroism ,Dichroic glass ,Polarization (waves) ,Biochemistry ,Ferroelectricity ,Catalysis ,Photonic metamaterial ,Colloid and Surface Chemistry ,Optoelectronics ,business ,Single crystal ,Perovskite (structure) - Abstract
Linear dichroic anisotropic photonic materials are highly attractive due to their great potentials in many applications, which in combination with the ferroelectric properties could broaden their research and applications. However, to date, the linear dichroism conversion phenomenon has not been observed in one-dimensional (1D) large-size single-crystal materials: in particular, lead-free perovskite ferroelectric crystals. Here, we propose a new ferroelectric design strategy: namely, partial organic cation substitution for precisely designing 1D polarization-sensitive perovskite ferroelectrics. As an example, the 1D mixed-cation perovskite ferroelectric (n-propylammonium)(methylammonium)SbBr5 was synthesized, which exhibits a fascinating ferroelectricity with a notable reversible polarization of 2.9 μC/cm2 and a large ferroelectricity-driven polarization ratio of 6.9. Importantly, the single-crystalline photodetectors also exhibit superior optoelectronic anisotropic performances at the paraelectric phase, having a large photoelectric anisotropy ratio (∼35), an excellent polarization-sensitive dichroism ratio (∼1.31), highly sensitive detectivity up to ∼109 Jones, and a fast response rate (∼45/68 μs). This finding provides a significant and effective pathway for the targeted design of new functional lead-free linear dichroic anisotropic photonic ferroelectrics. more...
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- 2021
22. [(N-AEPz)ZnCl4]Cl: A 'Green' Metal Halide Showing Highly Efficient Bluish-White-Light Emission
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Lina Li, Sasa Wang, Xitao Liu, Xinyuan Zhang, Yunpeng Yao, Maochun Hong, Junhua Luo, and Yu Peng
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Flexibility (engineering) ,010405 organic chemistry ,Chemistry ,Halide ,010402 general chemistry ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,Inorganic Chemistry ,Metal ,visual_art ,White light ,visual_art.visual_art_medium ,Physical and Theoretical Chemistry - Abstract
Benefiting from their structural flexibility and solution processability, organic–inorganic metal halide hybrids with efficient white-light emission present a great promise for solid-state lighting... more...
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- 2020
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23. A tubular luminescent framework: precise decoding of nitroaniline isomers and quantitative detection of traces of benzaldehyde in benzyl alcohol
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Caiping Liu, Dong Wu, Qihui Chen, Daqiang Yuan, Kang Zhou, Jiayue Tian, Feilong Jiang, and Maochun Hong
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Benzaldehyde ,chemistry.chemical_compound ,Materials science ,chemistry ,Absorption spectroscopy ,Benzyl alcohol ,Materials Chemistry ,General Chemistry ,Emission spectrum ,Luminescence ,Combinatorial chemistry ,Decoding methods ,Nitroaniline - Abstract
Precise identification of each isomer among a series of isomers remains a formidable challenge. Herein, a novel luminescent framework (FJI-H26) with 1.6 nm nanochannels was prepared. It was used to precisely decode o-nitroaniline, m-nitroaniline, and p-nitroaniline, because of the specific matching between the emission spectrum of FJI-H26 and the absorption spectrum of every nitroaniline isomer. Furthermore, it was used to quantitatively detect traces of benzaldehyde from benzyl alcohol injections, and its linear ranges completely conformed to the requirements of both Chinese and European Pharmacopoeias. Such decoding behavior based on discriminative matching between the emission spectrum of a chemosensor and the absorption spectra of analytes has not been reported so far, and this can prove to be a potential strategy for the development of new chemosensors for precisely decoding isomers. more...
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- 2020
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24. Cation-doping matters in caesium lead halide perovskite nanocrystals: from physicochemical fundamentals to optoelectronic applications
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Yameng Chen, Maochun Hong, and Yongsheng Liu
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Photoluminescence ,Materials science ,business.industry ,Doping ,chemistry.chemical_element ,Halide ,law.invention ,chemistry ,Nanocrystal ,law ,Caesium ,Optoelectronics ,General Materials Science ,business ,Luminescence ,Perovskite (structure) ,Light-emitting diode - Abstract
All-inorganic caesium lead halide perovskite nanocrystals (PeNCs) with different dimensionalities have recently fascinated the research community due to their extraordinary optoelectronic properties including tunable bandgaps over the entire visible spectral region, high photoluminescence quantum yields (PLQYs) close to unity and narrow emission line widths down to 10–20 nm, making them particularly suitable as promising candidates for numerous applications ranging from light-emitting diodes (LEDs), solar cells to scintillators. Despite the considerable progress made in the past six years, the real-world applications of caesium lead halide PeNCs themselves especially in the category of CsPbX3 (X = Cl, Br and I) are still restricted by their labile crystal lattices and downgraded luminescence when exposed to ambient air conditions. Recent experimental and theoretical studies on cation doping have proven to be an effective way to significantly improve the physicochemical properties of cesium lead halide PeNCs, which would have profound implications for a range of applications. In this review, we provide a brief overview of the most recent advances in cation-doped all-inorganic caesium lead halide PeNCs, aimed at developing high-performance and long-term stable optoelectronic and photovoltaic devices, which covers areas from their fundamental considerations of cation doping, controlled synthesis methodology and novel physicochemical properties to the optoelectronic applications with an emphasis on perovskite-based LEDs and solar cells. And finally, some possible directions of future efforts toward this active research field are also proposed. more...
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- 2020
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25. Constructing multi-cluster copper(<scp>i</scp>) halides using conformationally flexible ligands
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Caiping Liu, Zhu Zhuo, Jiangquan Lv, Yunfang Zhao, Shengchang Li, Maochun Hong, Lian Chen, Feilong Jiang, Yunlong Yu, and Muxin Yu
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Photoluminescence ,Materials science ,Metals and Alloys ,Multi cluster ,chemistry.chemical_element ,Halide ,General Chemistry ,Copper ,Catalysis ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Trap (computing) ,Crystallography ,chemistry ,Materials Chemistry ,Ceramics and Composites - Abstract
Three unprecedented multi-cluster copper(i) halides (MCCHs) have been assembled using conformationally flexible ligands. Further explorations demonstrate that the conformational compliance of the ligands may be the key to trap and stabilize the various copper(i)-halide clusters in one system, which opens a new way for the construction of multi-Cu(i)-cluster complexes. Moreover, the MCCHs show distinctive temperature-dependent photoluminescence. more...
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- 2020
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26. An Uncommon Hypervalent Fluorooxosilicophosphate
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Chunsen Li, Qingran Ding, Maochun Hong, Lina Li, Junhua Luo, Yusong Wang, Shuai Liu, Han Xiao, Sangen Zhao, and Yanqiang Li
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Silicon ,010405 organic chemistry ,Phonon ,Organic Chemistry ,Hypervalent molecule ,Species diversity ,chemistry.chemical_element ,Ionic bonding ,General Chemistry ,Conductivity ,010402 general chemistry ,01 natural sciences ,Biochemistry ,0104 chemical sciences ,chemistry ,Chemical physics ,Ionic conductivity ,Species richness - Abstract
The species diversity of silicon (including traditional tetrahedral coordinated silicon and hypervalent penta- and hexa-coordinate silicon) gives rise to the structural richness and diverse properties of silicates. Among these silicon species, hypervalent silicon is very rare, not to mention almost unexplored mixed-anion hypervalent fluoroxosilicate species. In this work, we successfully obtained a mixed-anion fluorooxosilicophosphate Na4Si2PO4F9 consisting of two uncommon hypervalent fluoroxosilicate species, namely, trans-SiO2F4 species and SiOF5 species. To the best of our knowledge, such hypervalent silicon species are reported for the first time in inorganic compounds. Remarkably, the coexistence of two distinct hypervalent fluoroxosilicate species in one compound is somewhat conflicted with Pauling's parsimony rule, but it indeed achieves an unlikely connection by PO4 and our phonon dispersion calculation confirms the structure stability of Na4 Si2 PO4 F9 . Temperature-dependent conductivity measurements show that Na4 Si2 PO4 F9 is a promising solid ionic conductor with a high conductivity of 4.0×10-5 S⋅cm-1 at 700 K and a low active energy of about 53.1 KJ⋅mol-1 . This work will enrich the structure chemistry of silicates and may provide a new platform for solid ionic batteries. more...
- Published
- 2019
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27. A Robust Multifunctional Eu6-Cluster Based Framework for Gas Separation and Recognition of Small Molecules and Heavy Metal Ions
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Zhengyi Di, Maochun Hong, Mingyan Wu, Jing Li, and Falu Hu
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Lanthanide ,010405 organic chemistry ,Ligand ,Chemistry ,Metal ions in aqueous solution ,General Chemistry ,Fluorene ,010402 general chemistry ,Condensed Matter Physics ,01 natural sciences ,Small molecule ,0104 chemical sciences ,Crystallography ,chemistry.chemical_compound ,Cluster (physics) ,General Materials Science ,Metal-organic framework ,Gas separation - Abstract
We report a multifunction lanthanide-based metal organic framework (Eu-SPFF) constructed by a hexanuclear Eu(III) cluster and a tetracarboxylate ligand 4,4′,4″,4‴-(9,9′-spirobi[fluorene]-2,2′,7,7′-... more...
- Published
- 2019
- Full Text
- View/download PDF
28. Constructing π-Stacked Supramolecular Cage Based Hierarchical Self-Assemblies via π···π Stacking and Hydrogen Bonding
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Maochun Hong, Wei Wang, Guo-Ling Li, Hai-Feng Su, Zhu Zhuo, You-Gui Huang, Xue-li Cao, and Bin Wang
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Superstructure ,Hydrogen bond ,Intermolecular force ,Supramolecular chemistry ,Stacking ,General Chemistry ,Biochemistry ,Catalysis ,Crystallography ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,chemistry ,Cluster (physics) ,Molecule ,Acetonitrile - Abstract
Constructing supramolecular cages with multiple subunits via weak intermolecular interactions is a long-standing challenge in chemistry. So far, π-stacked supramolecular cages still remain unexplored. Here, we report a series of π-stacked cage based hierarchical self-assemblies. The π-stacked cage (π-MX-cage) is assembled from 16 [MXL]+ ions (M = Mn2+, Co2+; X = Br-, SCN-, Cl-; and L = tris(2-benzimidazolylmethyl)amine) via 18 intermolecular π-stacking interactions. The tetrahedral cage, consisting of four [MXL]+ ions as the vertexes and six pairs of [MXL]+ ions as the edges, features 48 exterior N-H hydrogen bond donors for hydrogen bond formation with guest molecules. By variation of the M2+/X- pair, the π-MX-cage demonstrates unique versatility for incorporating a wide variety of species via different hydrogen-bonding modes during the assembly of hierarchical superstructures. In specific, the π-MnBr-cages encapsulate acetonitrile (CH3CN) or cis-1,3,5-cyclohexanetricarbonitrile (cis-HTN) molecules in the central voids, while a core-shell tetrahedral inorganic cluster [Mn(H2O)6]@([Mn(H2O)4]4[Br42-]6) (Mn@Mn4-cage) is captured within the interstitial regions between cages. The π-CoSCN-cages are capable of stabilizing reactive sulfur-containing species, such as S2O42-, S2O62-, and HSO3- ions, in the hierarchical superstructure. Finally, H2PO4- ions are incorporated between π-CoCl-cages, resulting in an inorganic mesoporous framework. These results provide insights into further exploring the chemistry and hierarchical assembly of supramolecular cages based on π-π stacking intermolecular interactions. more...
- Published
- 2021
29. Metal-organic tube or layered assembly: reversible sheet-to-tube transformation and adaptive recognition
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Qihui Chen, Jiayue Tian, Qing-Fu Sun, Luyao Liu, Zixiao Hong, Maochun Hong, Feilong Jiang, Kang Zhou, and Daqiang Yuan
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Metal ,Chemistry ,Template ,Materials science ,visual_art ,visual_art.visual_art_medium ,Molecule ,Liquid phase ,food and beverages ,Potential method ,Nanotechnology ,General Chemistry - Abstract
Rational preparation of an adaptive cavity-like enzyme is a great challenge for chemists. Herein, a new self-assembly strategy for the rational preparation of metal–organic tubes with nano-channels has been developed; both 1D metal–organic tube and corresponding 2D layered assemblies can be selectively synthesized driven by different templates; reversible sheet-to-tube transformation can be realized and the key intermediate has been identified. Furthermore, the newly formed nano-channel displays excellent polarity-selectivity for encapsulation of guest molecules, and can be further expanded or contracted through guest-driven adaptive deformation; even induced by very similar guest molecules, the adaptive deformations can also be obviously distinguished. Finally, the key chemicals benzene/hexane with a similar size can also be effectively separated by such nano-channels in the liquid phase. Our work not only provides a new synthetic strategy for the rational synthesis of metal–organic tubes with a reversible sheet-to-tube transformation character, but also gives a potential method for the construction of adaptive host-like enzymes and an in-depth understanding of the nature of adaptive host and guest molecules., A new strategy for preparing metal–organic tubes with reversible sheet-to-tube transformation character has been developed. The new-formed tube can selectively recognize and separate guest molecules with similar size. more...
- Published
- 2021
30. Construction of a Stable Lanthanide Metal-Organic Framework as a Luminescent Probe for Rapid Naked-Eye Recognition of Fe3+ and Acetone
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Muxin Yu, Shengchang Li, Jiayishuo Wang, Lian Chen, Maochun Hong, Zhijia Li, and Feilong Jiang
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Lanthanide ,Materials science ,Pharmaceutical Science ,Analytical Chemistry ,lcsh:QD241-441 ,lcsh:Organic chemistry ,acetone sensors ,Drug Discovery ,luminescence ,lanthanides ,Physical and Theoretical Chemistry ,Isostructural ,Fe3+ sensors ,metal-organic frameworks ,chemistry.chemical_classification ,Organic Chemistry ,Fluorescence ,Crystallography ,Dicarboxylic acid ,chemistry ,Chemistry (miscellaneous) ,Molecular Medicine ,Metal-organic framework ,Naked eye ,Luminescence ,Monoclinic crystal system - Abstract
Four lanthanide metal-organic frameworks (Ln-MOFs), namely {[Me2NH2][LnL]·2H2O}n (Ln = Eu 1, Tb 2, Dy 3, Gd 4), have been constructed from a new tetradentate ligand 1-(3,5-dicarboxylatobenzyl)-3,5-pyrazole dicarboxylic acid (H4L). These isostructural Ln-MOFs, crystallizing in the monoclinic P21/c space group, feature a 3D structure with 7.5 Å × 9.8 Å channels along the b axis and the point symbol of {410.614.84} {45.6}2. The framework shows high air and hydrolytic stability, which can keep stable after exposed to humid air for 30 days or immersed in water for seven days. Four MOFs with different lanthanide ions (Eu3+, Tb3+, Dy3+, and Gd3+) ions exhibit red, green, yellow, and blue emissions, respectively. The Tb-MOF emitting bright green luminescence can selectively and rapidly (<, 40 s) detect Fe3+ in aqueous media via a fluorescence quenching effect. The detection shows excellent anti-inference ability toward many other cations and can be easily recognized by naked eyes. In addition, it can also be utilized as a rapid fluorescent sensor to detect acetone solvent as well as acetone vapor. Similar results of sensing experiments were observed from Eu-MOF. The sensing mechanism are further discussed. more...
- Published
- 2021
31. Functionalized Metal-Organic Frameworks for Hg(II) and Cd(II) Capture: Progresses and Challenges
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Jiayue Tian, Feilong Jiang, Maochun Hong, Qihui Chen, and Changyin Yang
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Cadmium ,Aqueous solution ,Chemistry ,General Chemical Engineering ,Metal ions in aqueous solution ,Inorganic chemistry ,chemistry.chemical_element ,General Chemistry ,Biochemistry ,Mercury (element) ,Adsorption ,Materials Chemistry ,Surface modification ,Metal-organic framework ,Porosity - Abstract
Mercury and cadmium are deemed to be the most harmful heavy metal ions for elimination due to their persistent bio-accumulative and bio-expanding toxic effects. Although many technologies have been developed for capturing Hg(II) and Cd(II) ions from aqueous solution, developing efficient and practical capature technology remains a big challenge. Metal-organic frameworks (MOFs) have been considered as the most promising adsorbents for Hg(II) and Cd(II) removal due to their high porosity and easy functionalization, and various of MOF-based adsorbents based on different synthetic strategies have been prepared and studied. In this article, the progresses of MOF-based absorbents for Hg(II) and Cd(II) capture are described according to the synthetic strategies and the types of functional groups, and the comparison and practical analysis of various adsorbents are also presented. more...
- Published
- 2021
32. Introduction of Flexibility into a Metal-Organic Framework to Promote Hg(II) Capture through Adaptive Deformation
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Daqiang Yuan, Jiayue Tian, Chengdan Shi, Maochun Hong, Qihui Chen, Cao Xiao, and Feilong Jiang
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Aqueous solution ,010405 organic chemistry ,Chemistry ,Ligand ,Inorganic chemistry ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences ,Ion ,Inorganic Chemistry ,Adsorption ,Chemical stability ,Amine gas treating ,Physical and Theoretical Chemistry ,Absorption (chemistry) ,Deformation (engineering) - Abstract
The development of a practical Hg(II) adsorbent is highly important for both environmental protection and public health. Herein, an adaptive metal-organic framework (MOF; FJI-H30) has been prepared from a highly flexible ligand [tris(pyridin-4-ylmethyl)amine] and Co(SCN)2 with cheap Hg(II) adsorption sites (SCN- groups) that not only has excellent chemical stability but also can capture Hg(II) from aqueous solution with high adsorption capacity (705 mg g-1). Moreover, it also has good anti-interference ability and can be used repeatedly and large-scale prepared. Further researches demonstrate that the relatively high Hg(II) adsorption capacity originates from the adsorbed Hg(II)-induced deformation of FJI-H30, and such an adaptive deformation will reduce the potential repulsive forces between the adsorbed Hg(II) ions, enabling almost all Hg(II) absorption sites to adsorb Hg(II) ions. Finally, how to induce the deformation of FJI-H30 by adsorbed Hg(II) also has been studied in detail. Our work not only provides a practical Hg(II) adsorbent for wastewater treatment but also offers a novel strategy for the design of novel MOFs for efficient heavy-metal-ion removal. more...
- Published
- 2020
33. An Unprecedented Pillar-Cage Fluorinated Hybrid Porous Framework with Highly Efficient Acetylene Storage and Separation
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Caiping Liu, Mingyan Wu, Hao Li, Maochun Hong, Jiandong Pang, Cheng Chen, Daqiang Yuan, Wei Wei, and Zhengyi Di
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Materials science ,010405 organic chemistry ,General Medicine ,General Chemistry ,010402 general chemistry ,01 natural sciences ,Catalysis ,0104 chemical sciences ,Metal ,chemistry.chemical_compound ,Adsorption ,Acetylene ,chemistry ,Chemical engineering ,visual_art ,Selective adsorption ,visual_art.visual_art_medium ,Metal-organic framework ,Selectivity ,Porosity ,BET theory - Abstract
Despite much intense investigation on the C 2 H 2 /CO 2 separation, the trade-off between the adsorption capacity and separation selectivity is still tricky. To overcome the dilemma, we have rationally synthesized an ultra-stable fluorinated hybrid porous material SIFSIX-Cu-TPA with the ith-d topology. Completely differing from the famous pillar-layer fluorinated materials, SIFSIX-Cu-TPA possesses a unique pillar-cage structure, in which the SiF 6 2- anions cross-link two adjacent metal nodes as pillars to stabilize the three-dimensional framework constructed by icosahedral and tetrahedral cages. As anticipated, SIFSIX-Cu-TPA has high BET surface area (1330 m 2 /g) as well as high C 2 H 2 uptake (185 cm 3 /g at 298 K and 1 bar). At the same time, due to the obvious difference in the adsorption performance of CO 2 and C 2 H 2 especially in the low pressure area, SIFSIX-Cu-TPA also exhibits an excellent C 2 H 2 /CO 2 separation performance (breakthrough time up to 68 min/g at 298K and 1 bar). more...
- Published
- 2020
34. Peasecod‐Like Hollow Upconversion Nanocrystals with Excellent Optical Thermometric Performance
- Author
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Huhui Fu, Maochun Hong, Pengfei Peng, Yongsheng Liu, Caiping Liu, and Feilong Jiang
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Lanthanide ,Materials science ,General Chemical Engineering ,Population ,Li4ZrF8 ,General Physics and Astronomy ,Medicine (miscellaneous) ,chemistry.chemical_element ,02 engineering and technology ,Crystal structure ,010402 general chemistry ,01 natural sciences ,Biochemistry, Genetics and Molecular Biology (miscellaneous) ,General Materials Science ,education ,lcsh:Science ,nanothermometers ,lanthanide ions ,upconversion ,education.field_of_study ,Zirconium ,Full Paper ,business.industry ,Doping ,hollow nanocrystals ,General Engineering ,Full Papers ,021001 nanoscience & nanotechnology ,Photon upconversion ,0104 chemical sciences ,Nanocrystal ,chemistry ,Optoelectronics ,lcsh:Q ,0210 nano-technology ,business ,Luminescence - Abstract
Trivalent lanthanide (Ln3+)‐doped hollow upconversion nanocrystals (UCNCs) usually exhibit unique optical performance that cannot be realized in their solid counterparts, and thus have been receiving tremendous interest from their fundamentals to diverse applications. However, all currently available Ln3+‐doped UCNCs are solid in appearance, the preparation of hollow UCNCs remains nearly untouched hitherto. Herein, a class of UCNCs based on Yb3+/Er3+‐doped tetralithium zirconium octafluoride (Li4ZrF8:Yb/Er) featuring 2D layered crystal lattice is reported, which makes the fabrication of hollow UCNCs with a peasecod‐like shape possible after Ln3+ doping. By employing the first‐principle calculations, the unique peasecod‐like hollow nanoarchitecture primarily associated with the hetero‐valence Yb3+/Er3+ doping into the 2D layered crystal lattice of Li4ZrF8 matrix is revealed. Benefiting from this hollow nanoarchitecture, the resulting Li4ZrF8:Yb/Er UCNCs exhibit an abnormal green upconversion luminescence in terms of the population ratio between two thermally coupled states (2H11/2 and 4S3/2) of Er3+ relative to their solid Li2ZrF6:Yb/Er counterparts, thereby allowing to prepare the first family of hollow Ln3+‐doped UCNCs as supersensitive luminescent nanothermometer with almost the widest temperature sensing range (123–800 K). These findings described here unambiguously pave a new way to fabricate hollow Ln3+‐doped UCNCs for numerous applications., A class of peasecod‐like hollow Yb3+/Er3+‐doped Li4ZrF8 upconverting nanocrystals (UCNCs) that features a 2D layered crystal lattice is reported. Abnormal green upconverting luminescence that cannot be achieved in the solid UCNCs is observed in these peasecod‐like hollow UCNCs, thereby making them suitable as supersensitive nanothermometers with a wide temperature range for optical temperature sensing. more...
- Published
- 2020
35. Lanthanide-Doped KGd2F7 Nanocrystals: Controlled Synthesis, Optical Properties, and Spectroscopic Identification of the Optimum Core/Shell Architecture for Highly Enhanced Upconverting Luminescence
- Author
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Guowei Li, Yongsheng Liu, Lihua Yu, Maochun Hong, and Feilong Jiang
- Subjects
Lanthanide ,Core shell architecture ,Materials science ,010405 organic chemistry ,Doping ,General Chemistry ,010402 general chemistry ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,chemistry.chemical_compound ,Nanocrystal ,chemistry ,Physical chemistry ,General Materials Science ,Luminescence ,Fluoride - Abstract
Trivalent Lanthanide (Ln3+)-doped fluoride nanocrystals (NCs) in the category of ALn2F7 (A = Li, Na, and K) have recently emerged as an attractive alternative to the well-developed ALnF4-type fluor... more...
- Published
- 2019
- Full Text
- View/download PDF
36. Discovery of an Above-Room-Temperature Antiferroelectric in Two-Dimensional Hybrid Perovskite
- Author
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Zhihua Sun, Maochun Hong, Chengmin Ji, Sasa Wang, Yu Peng, Xitao Liu, Zhenyue Wu, Junhua Luo, Kewen Tao, and Lina Li
- Subjects
Chemistry ,General Chemistry ,Atmospheric temperature range ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Catalysis ,Energy storage ,0104 chemical sciences ,Colloid and Surface Chemistry ,Chemical physics ,visual_art ,Electric field ,visual_art.visual_art_medium ,Curie temperature ,Antiferroelectricity ,Ceramic ,Polarization (electrochemistry) ,Perovskite (structure) - Abstract
Antiferroelectric materials have been regarded as a promising candidate for electronic energy storage devices, due to their natural double polarization versus electric field ( P- E) hysteresis loops. Currently, two-dimensional organic-inorganic hybrid perovskites with structural diversity and tunability, have received blooming interests, whereas above-room-temperature antiferroelectrics are still unreported in this perovskite system. Herein, for the first time, we successfully acquire a two-dimensional Ruddlesden-Popper hybrid perovskite antiferroelectric, ((CH3)2CHCH2NH3)2CsPb2Br7 (1), which shows an above-room-temperature Curie temperature at 353 K, trigging by the synergistic dynamic motion of inorganic Cs atoms and organic isobutylammonium cations. Intriguingly, the antiferroelectricity of 1 existing over a wide temperature range of 298-353 K are revealed by the distinct double P- E hysteresis loops. Besides, 1 possesses remarkable energy storage efficiency up to 69%, comparable to those of some reported inorganic antiferroelectric ceramics, promoting 1 potential application in energy storage devices. This work provides an avenue to construct novel antiferroelectric materials for high-performance electronic device applications. more...
- Published
- 2019
- Full Text
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37. Two-Dimensional Hybrid Perovskite-Type Ferroelectric for Highly Polarization-Sensitive Shortwave Photodetection
- Author
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Kewen Tao, Zhihua Sun, Junhua Luo, Lina Li, Xitao Liu, Zhenyue Wu, Maochun Hong, Yaobin Li, Zhiyun Xu, and Shiguo Han
- Subjects
business.industry ,Chemistry ,Band gap ,General Chemistry ,Photodetection ,Dichroism ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Ferroelectricity ,Catalysis ,Dissociation (chemistry) ,0104 chemical sciences ,Spontaneous polarization ,Colloid and Surface Chemistry ,Polarization sensitive ,Optoelectronics ,business ,Shortwave - Abstract
Two-dimensional (2D) materials have been well developed for polarization-sensitive photodetection, while new 2D members used in shortwave region (>2.5 eV) still remain scarce. The family of 2D hybrid perovskite ferroelectrics, in which the coupling of spontaneous polarization (Ps) and light benefits dissociation of photoinduced carriers, has shown great potential in this portfolio. Here, we report a new 2D hybrid perovskite ferroelectric, [CH3(CH2)3NH3]2(CH3NH3)Pb2Br7 (1), which exhibits a superior Ps of 3.6 μC/cm2 and a relatively wide bandgap (∼2.55 eV). The unique 2D perovskite motif results in an intrinsic anisotropy of optical absorption (the ratio αc/αa ≈ 1.9 at 405 nm), involving its polarization-sensitive activity. As expected, the strongest photoresponses were observed along the c-axis (i.e., parallel to Ps), along with a large dichroism ratio (Iphc/Ipha ≈ 2.0) and highly sensitive detectivity up to ∼109 Jones. Further, crystal-device of 1 shows a fast responding rate (∼20 μs) and excellent antif... more...
- Published
- 2019
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38. A water-stable 3D Eu-MOF based on a metallacyclodimeric secondary building unit for sensitive fluorescent detection of acetone molecules
- Author
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Jiandong Pang, Xiuyan Wan, Maochun Hong, Mingyan Wu, Lian Chen, Feilong Jiang, and Yan Yang
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Secondary building unit ,Chemistry ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Photochemistry ,01 natural sciences ,Fluorescence ,0104 chemical sciences ,chemistry.chemical_compound ,Ph range ,Acetone ,Molecule ,General Materials Science ,0210 nano-technology ,Luminescence - Abstract
Four novel luminescent Ln-MOFs with systematic metallacyclodimeric secondary building units have been designed, synthesized and characterized. It is notable that the compounds can bear acidic or basic conditions in a wide pH range (pH = 3–11). Remarkably, the Eu-MOF (1) can be utilized as a promising luminescent probe for acetone molecules. more...
- Published
- 2019
- Full Text
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39. Interconvertible vanadium-seamed hexameric pyrogallol[4]arene nanocapsules
- Author
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Daqiang Yuan, Maochun Hong, Mingyan Wu, and Kongzhao Su
- Subjects
Materials science ,Science ,General Physics and Astronomy ,Vanadium ,chemistry.chemical_element ,010402 general chemistry ,01 natural sciences ,Article ,General Biochemistry, Genetics and Molecular Biology ,Dissociation (chemistry) ,Nanocapsules ,Metal ,chemistry.chemical_compound ,Molecule ,lcsh:Science ,Multidisciplinary ,010405 organic chemistry ,General Chemistry ,0104 chemical sciences ,Crystallography ,Octahedron ,chemistry ,Pyrogallol ,visual_art ,visual_art.visual_art_medium ,lcsh:Q - Abstract
Research into stimuli-responsive controlled self-assembly and reversible transformation of molecular architectures has received much attention recently, because it is important to understand and reproduce this natural self-assembly behavior. Here, we report two coordination nanocapsules with variable cavities: a contracted octahedral V24 capsule and an expanded ball-shaped V24 capsule, both of which are constructed from the same number of subcomponents. The assemblies of these two V24 capsules are solvent-controlled, and capable of reversible conversion between contracted and expanded forms via control of the geometries of the metal centers by association and dissociation with axial water molecules. Following such structural interconversions, the magnetic properties are significantly changed. This work not only provides a strategy for the design and preparation of coordination nanocapsules with adaptable cavities, but also a unique example with which to understand the transformation process and their structure-property relationships., Adapting the cavity of a coordination capsule generally involves the addition or removal of subcomponents. Here, the authors report two vanadium-organic coordination nanocapsules with the same number of components but variable cavity sizes—an expanded ball and contracted octahedron—whose solvent-controlled interconversion is attributed to the versatile coordination geometry of the vanadium centers. more...
- Published
- 2018
40. Controllable Coordination Self‐Assembly Based on Flexibility of Ligands: Synthesis of Supramolecular Assemblies and Stimuli‐Driven Structural Transformations
- Author
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Feilong Jiang, Qihui Chen, Maochun Hong, Haiyang Hou, and Kang Zhou
- Subjects
Flexibility (engineering) ,010405 organic chemistry ,Chemistry ,Supramolecular chemistry ,Nanotechnology ,General Chemistry ,Self-assembly ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences - Published
- 2018
- Full Text
- View/download PDF
41. Alloying n ‐Butylamine into CsPbBr 3 To Give a Two‐Dimensional Bilayered Perovskite Ferroelectric Material
- Author
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Jintao Kong, Lina Li, Junhua Luo, Chengmin Ji, Sasa Wang, Zhenyue Wu, Zhihua Sun, Sangen Zhao, and Maochun Hong
- Subjects
Materials science ,010405 organic chemistry ,Photoconductivity ,chemistry.chemical_element ,Halide ,General Medicine ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Alkali metal ,01 natural sciences ,Ferroelectricity ,Catalysis ,0104 chemical sciences ,Ion ,Crystallography ,chemistry ,Caesium ,Curie temperature ,0210 nano-technology ,Perovskite (structure) - Abstract
Cesium-lead halide perovskites (e.g. CsPbBr3 ) have gained attention because of their rich physical properties, but their bulk ferroelectricity remains unexplored. Herein, by alloying flexible organic cations into the cubic CsPbBr3 , we design the first cesium-based two-dimensional (2D) perovskite ferroelectric material with both inorganic alkali metal and organic cations, (C4 H9 NH3 )2 CsPb2 Br7 (1). Strikingly, 1 shows a high Curie temperature (Tc =412 K) above that of BaTiO3 (ca. 393 K) and notable spontaneous polarization (ca. 4.2 μC cm-2 ), triggered by not only the ordering of organic cations but also atomic displacement of inorganic Cs+ ions. To our knowledge, such a 2D bilayered Cs+ -based metal-halide perovskite ferroelectric material with inorganic and organic cations is unprecedented. 1 also shows photoelectric semiconducting behavior with large "on/off" ratios of photoconductivity (>103 ). more...
- Published
- 2018
- Full Text
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42. Syntheses, structures, photoluminescence and magnetic properties of 1D lanthanide chains featuring 2,2′-bipyridine-5-carboxylic ligands
- Author
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Peng Lin, Feilong Jiang, Maochun Hong, and Mingyan Wu
- Subjects
Lanthanide ,Photoluminescence ,Materials science ,Ligand ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Hydrothermal circulation ,2,2'-Bipyridine ,0104 chemical sciences ,Inorganic Chemistry ,Crystallography ,chemistry.chemical_compound ,chemistry ,Materials Chemistry ,Physical and Theoretical Chemistry ,Isostructural ,0210 nano-technology ,Luminescence ,Powder diffraction - Abstract
A series of isostructural coordination polymers based on lanthanide cations and 2,2′-bipyridine-5-carboxylic ligands, i.e. [Ln3L9]n·0.5nH2O (Ln = Eu (1), Gd (2) and Tb (3); HL = 2,2′-bipyridine-5-carboxylic acid), have been synthesized under hydrothermal condition and characterized by single-crystal X-ray diffractions, powder X-ray diffractions (PXRD), thermal analyses (TGA) and elemental analyses (EA). These three complexes all have the 1D chain-like structures containing dinuclear lanthanide units. The solid state luminescent properties of 1 and 3 as well as the magnetic property of 2 are investigated. The results indicate that the 2,2′-bipyridine-5-carboxylic acid ligand is a good sensitizer for the Eu(III) cation. more...
- Published
- 2018
- Full Text
- View/download PDF
43. Boosting photocatalytic cross-dehydrogenative coupling reaction by incorporating [RuII(bpy)3] into a radical metal-organic framework
- Author
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Shao-Xia Lin, Yan-Xi Tan, Caiping Liu, Yiyin Huang, Mi Zhou, Qiang Kang, Daqiang Yuan, and Maochun Hong
- Subjects
010405 organic chemistry ,Process Chemistry and Technology ,Radical ,Intermolecular force ,010402 general chemistry ,01 natural sciences ,Combinatorial chemistry ,Catalysis ,Coupling reaction ,Photoinduced electron transfer ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Photocatalysis ,Metal-organic framework ,Organic synthesis ,General Environmental Science - Abstract
Due to energy-efficient and green processes of photocatalysis, the visible-light-driven photocatalytic organic synthesis has developed greatly in the last decade. The well-known photocatalysts, RuII-polypyridyl complexes, have been extensively exploited in the synthesis of various chemicals. However, homogeneity of RuII-polypyridyl complexes makes their recycling difficult. Here, we show an effective strategy for boosting photocatalysis by incorporating [RuII(bpy)3] into a radical metal-organic framework (FJI-Y2). Recyclable photocatalyst FJI-Y2 can efficiently catalyze the cross-dehydrogenative coupling reactions of N-phenyltetrahydroisoquinoline derivatives with phosphite esters, forming medicinal α-aminoquinoline phosphonates. More importantly, the photocatalytic efficiency of FJI-Y2 is actually higher than its homogeneous counterpart [RuII(bpy)3]Cl2, because multiple intermolecular interactions between 1,4,5,8-naphthalenediimide radicals and [RuII(bpy)3] induce optimal photoinduced electron transfer process to expedite chemical conversion and recycling of catalysts. It is envisioned that MOFs containing radicals can be ideal platforms to incorporate more noble-metal photocatalysts for promoting photocatalysis. more...
- Published
- 2018
- Full Text
- View/download PDF
44. Bilayered Hybrid Perovskite Ferroelectric with Giant Two-Photon Absorption
- Author
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Sangen Zhao, Lina Li, Xiaoying Shang, Junhua Luo, Ningning Dong, Jun Wang, Chengmin Ji, Sasa Wang, Zhihua Sun, Maochun Hong, and Xueyuan Chen
- Subjects
Condensed matter physics ,Field (physics) ,Chemistry ,business.industry ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry ,Two-photon absorption ,Ferroelectricity ,Catalysis ,0104 chemical sciences ,Colloid and Surface Chemistry ,Attenuation coefficient ,Curie temperature ,Photonics ,0210 nano-technology ,business ,Absorption (electromagnetic radiation) ,Perovskite (structure) - Abstract
Perovskite ferroelectrics with prominent nonlinear optical absorption have attracted great attention in the field of photonics. However, they are traditionally dominated by inorganic oxides and exhibit relatively small nonlinear optical absorption coefficients, which hinder their further applications. Herein, we report a new organic–inorganic hybrid bilayered perovskite ferroelectric, (C4H9NH3)2(NH2CHNH2)Pb2Br7 (1), showing an above-room-temperature Curie temperature (∼322 K) and notable spontaneous polarization (∼3.8 μC cm–2). Significantly, the unique quantum-well structure of 1 results in intriguing two-photon absorption properties with a giant nonlinear optical absorption coefficient as high as 5.76 × 103 cm GW–1, which is almost two-orders of magnitude larger than those of mostly traditional all-inorganic perovskite ferroelectrics. To our best knowledge, 1 is the first example of hybrid ferroelectrics with giant two-photon absorption coefficient. The mechanisms for ferroelectric and two-photon absorp... more...
- Published
- 2018
- Full Text
- View/download PDF
45. Incorporation of In2S3 Nanoparticles into a Metal–Organic Framework for Ultrafast Removal of Hg from Water
- Author
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Dong Wu, Feilong Jiang, Hai-Long Jiang, Maochun Hong, Daqiang Yuan, Caiping Liu, Qihui Chen, Luyao Liu, and Linfeng Liang
- Subjects
Metal ions in aqueous solution ,chemistry.chemical_element ,Nanoparticle ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Industrial waste ,0104 chemical sciences ,Mercury (element) ,Inorganic Chemistry ,Industrial wastewater treatment ,Adsorption ,Wastewater ,Chemical engineering ,chemistry ,Physical and Theoretical Chemistry ,0210 nano-technology ,Selectivity - Abstract
Considering rapidly rising Hg emission from industrial waste effluents, it is imperative to explore practical and effective adsorbents for Hg. Herein, a mild and facile method has been developed to confine ultrasmall In2S3 nanoparticles (about 2.5 nm) in the cavities of a MOF for the first time. The resulting composite (In2S3@MIL-101) can remove 99.95% of the Hg2+ from wastewater very efficiently in as short as 1 min with the highest distribution coefficient (2.2 × 107 mL g–1) among all MOF-based mercury adsorbents. It also displays excellent selectivity for Hg even when other interferential metal ions are present, and it can be reused with almost retained adsorption capacity. All of these features make the composite a potential adsorbent for Hg removal from industrial wastewater. more...
- Published
- 2018
- Full Text
- View/download PDF
46. 3D metal-organic frameworks based on lanthanide-seamed dimeric pyrogallol[4]arene nanocapsules
- Author
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Wenjing Wang, Kongzhao Su, Mingyan Wu, Mi Zhou, Maochun Hong, and Daqiang Yuan
- Subjects
Lanthanide ,Materials science ,010405 organic chemistry ,Supramolecular chemistry ,General Chemistry ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences ,Solvent ,Magnetization ,chemistry.chemical_compound ,Crystallography ,Pyrogallol ,chemistry ,Magnetic refrigeration ,Metal-organic framework ,Formate - Abstract
Two novel 3D metal-organic frameworks (MOFs) with cds network, {[MeNH3]7[Ln8(PgC2)2(H2O)y(HCOO)7]} n · x (Solvent) ( FJI-Y4 , FJI =Fujian Institute, Ln=Gd, y =12; FJI-Y5 , Ln=Dy, y =11; PgC2= C -ethylpyrogallol[4]arene), based on unprecedented dimeric pyrogallol[4]arene-based Ln8 metal-organic nanocapsule (MONC) supramolecular building blocks and formate linkers, have been prepared under solvothermal conditions. To our best of knowledge, they present not only the first two examples of 3D hierarchical structures constructed from MONCs in metal-pyrogallol[4]arene system, but also the first two examples of MOFs based on lanthanide MONCs. Remarkably, the inner cavity volume of the Ln8 capsule in FJI-Y4 and FJI-Y5 is approximately 151 A3, which is larger than those found in previous transition metal-seamed dimeric PgC n -based MONCs. Magnetic investigation on FJI-Y4 suggests a significant magnetocaloric effect (23.97 J kg−1 K−1, Δ H = 7 T, 2.5 K), while FJI-Y5 exhibits slow relaxation of the magnetization. more...
- Published
- 2018
- Full Text
- View/download PDF
47. A multistep oriented attachment kinetics: Coarsening of ZnS nanoparticle in concentrated NaOH
- Author
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Jing Zhang, Feng Huang, Maochun Hong, Zhang Lin, Youzhao Lan, Guoqiang Ren, and Dagui Chen
- Subjects
Sodium hydroxide -- Chemical properties ,Sodium hydroxide -- Thermal properties ,Nanoparticles -- Chemical properties ,Nanoparticles -- Thermal properties ,Zinc compounds -- Chemical properties ,Zinc compounds -- Thermal properties ,Chemistry - Abstract
The observation of an exclusive multistep oriented attachment (OA) during hydrothermal growth of ZnS nanoparticles under 4 M NaOH is reported. The effect of concentrated NAOH on the OR is discussed and is proved to be the key that hinders the OR process, attributing to the almost exclusive pure OA-based growth of ZnS particles in the first stage. more...
- Published
- 2006
48. New 3-D chiral framework of indium with 1,3,5-Benzenetricarboxylate
- Author
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Zhengzhong Lin, Feilong Jiang, Lian Chen, Daqiang Yuan, and Maochun Hong
- Subjects
Pyridine -- Atomic properties ,Crystals -- Structure ,Crystals -- Research ,X-rays -- Diffraction ,X-rays -- Usage ,Chemistry - Abstract
A new complex, [In(sub 2)(mu-OH)(sub 2)(btc)(sub 2)](sub n). 2nHpy is hydrothermally synthesized from the reaction of InCl(sub 3), H(sub 3)btc, and pyridine. Single crystal X-ray diffraction analyses show the structure of the complex is a nonpenetrated three-dimensional (3-D) anionic framework with homochiral tunnels accommodating protonated pyridine cations. more...
- Published
- 2005
49. Room temperature self-healing and recyclable conductive composites for flexible electronic devices based on imine reversible covalent bond
- Author
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Heqing Fu, Hainan Wang, Maochun Hong, Jinbiao Min, Zhaoxi Zhou, and Qihui Chen
- Subjects
Materials science ,Mechanical Engineering ,Imine ,Metals and Alloys ,Carbon nanotube ,Carbon black ,Hot pressing ,law.invention ,chemistry.chemical_compound ,chemistry ,Mechanics of Materials ,Covalent bond ,law ,Electrical resistivity and conductivity ,Self-healing ,Materials Chemistry ,Composite material ,Electrical conductor - Abstract
With the development of flexible electronic devices, various requirements for flexible conductive materials have been put forward to. However, the self-healing, mechanical and conductive properties of the flexible materials are poor. Therefore, it is important to prepare self-healing materials with good mechanical and conductive properties. In this paper, room temperature self-healing and conductive composites based on imine reversible covalent bond were prepare by introducing of the carbon nanotube and carbon black. The self-healing, mechanical and conductive properties of the composites were studied. And the structure of the composites was also characterized. The experimental results showed that the mechanical strength and the electrical resistivity of composites were 6.6 MPa and 108 Ω·m, respectively. The composites have excellent room temperature self-healing properties through the reversible exchange of imine bond, and the healing efficiency of mechanical properties and the electrical properties can reach 96% and 93%, respectively. At the same time, the self-healing mechanism was put forward to. In addition, the composites can be recovered by solution recovery and hot pressing. more...
- Published
- 2022
- Full Text
- View/download PDF
50. Syntheses and characterizations of copper(II) polymeric complexes constructed from 1,2,4,5-benzenetetracarboxylic acid
- Author
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Rong Cao, Qian Shi, Daofeng Sun, Maochun Hong, Wenghua Bi, and Yingjun Zhao
- Subjects
Chemistry, Inorganic -- Research ,Copper compounds ,Polymers ,Coordination compounds ,Carboxylic acids ,Ligands ,Chemistry - Abstract
Research has been conducted on polymeric complexes with rectangular channels. The study of these complexes constructed from Cu(II) ion, auxiliary ligands and 1,2,4,5-benzenetetracarboxylic acid is presented. more...
- Published
- 2002
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