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Reaction of Mn(OAc)2·4H2O with pentaerythritol (H4peol) in the presence of NaSCN leads to formation of a 1-D coordination polymer (CP) based on Mn(II), [Mn(SCN)2(peol)]n (1, SCN− = thiocyanate), under solvothermal conditions. EA, FTIR, PXRD, SCXRD and TGA analyses were used to study the composition and phase purity of the Mn(II) coordination polymer. The degradation of alizarin was investigated using organic framework substances as degradation agents. The results showed that the maximum degradation value of 86.12% was achieved at 50 min. This study not only promotes the preparation of organic frameworks, but also provides a feasible solution for the effective degradation of alizarin. [ABSTRACT FROM AUTHOR]

Coordination polymers (CPs) are a diverse class of multi-dimensional compounds that show promise as photocatalysts for degrading dyes in polluted water. Herein, a new 1D Cd(II)-based coordination polymer with the formula [Cd(bpyp)(nba)2] (1) (bpyp = 2,5-bis(pyrid-4-yl)pyridine and Hnba = 4-nitrobenzoic acid) is synthesized and characterized. In 1, the two carboxyl groups of two different nba− ligands show μ2-η1:η1 and μ1-η1:η1 coordination modes to connect the CdII centers and sit on either side of the chain along the b direction. The produced CP 1 was utilized as the photocatalyst in the process of the photodegradation of methyl blue (MB), methyl orange (MO), rhodamine B (RhB), and methyl violet (MV) dyes when exposed to UV light. The photocatalytic degradation activities of CP 1 were analyzed, and the results suggest that it exhibits an extraordinary efficiency in the degradation of MB, MV, MO, and RhB. RhB has a 95.52% efficiency of degradation, whereas MV has a 58.92% efficiency, MO has 35.44%, and MB has 29.24%. The photodecomposition of dyes is catalyzed mostly by •O2− and •OH−, as shown by research involving the trapping of radicals. [ABSTRACT FROM AUTHOR]

In this work, two new copper-based coordination polymers (CPs), {[CuI(H2PO4)(dpe)]5(dpe)0.5(H2O)7}n (Cu-dpe(I)) and {[CuII(HPO4)(dpe)(H2O)](H2O)3}n (Cu-dpe(II)) (dpe = 1,2-di(4-pyridyl)ethylene), had been successfully constructed by hydrothermal method and solvent evaporation method, respectively, and their crystal structures were determined by single crystal X-ray diffraction. The differences of structure and properties between these two coordination polymers were discussed. The synthetic temperature caused their structure differences. They both exhibit excellent photocatalytic activity toward the degradation of methylene blue (MB) under visible light. The degradation rates of Cu-dpe(I) and Cu-dpe(II) to MB in 120 min under visible light were 88.1% and 97.2%, respectively. Some active free radicals such as ·OH, ·O2−, e− played an important role in degradation of MB. In addition, luminescent experiment revealed Cu-dpe(I) exhibits a relatively high sensitive and selective detection of Fe3+ ions in water solution via fluorescence quenching which was caused by competitive absorption of excitation wavelength energy between Fe3+ and Cu-dpe(I). [ABSTRACT FROM AUTHOR]

The 3D Zn(II) coordination polymer {[Zn3(L)(4,4′-bpy)]}n (GTU-3) was prepared with a novel hexapod-shaped molecular building block, hexakis(methyl-2-(4-phenoxyphenyl)acetatebenzene) cyclotriphosphazene (H6L1) by solvothermal reaction in dimethylformamide (DMF). Zn(II) coordination polymer was characterized by FTIR, thermal analysis, SEM-EDX, BET, powder X-ray diffraction analysis, and single crystal X-ray diffraction techniques. GTU-3 consists of six crystallographically independent Zn2+ ions, two fully deprotonated cyclophosphazene-based ligands, and two 4,4′-bipyridines (4,4′-bpy). In the complex, the flexible multisite cyclotriphosphazene bridging ligand (H6L) was completely deprotonated. GTU-3 exhibited relatively good catalytic activity toward Rhodamine B (RhB) removal in aqueous solution. A 0.4 g/L amount of GTU-3 could degrade the 10 mg/L solution of RhB up to 76.5% in the presence of peroxymonosulfate (PMS) oxidant in 1 h. The kinetic studies showed that the degradation process followed pseudo-first-order kinetic. By extending the degradation time to 5 h, the degradation efficiency reached 95.3%. Under the same conditions, Methylene Blue (MB) and Acid Red 17 (AR17) dyes were degraded by 86.2% and 52.8%, respectively. [ABSTRACT FROM AUTHOR]

Photocatalytic degradation of organic dyes in less-toxic products under visible light irradiation is considered a green method which is widely used in this field. In this manuscript, a novel coordination polymer (PUCP1) based hybrid-nanocomposite (PUCP1@rGO) was synthesized. The PUCP1 and nanocomposite were successfully characterized by using various analytical techniques such as SCXRD, FT–IR, PXRD, TGA, FE–SEM, BET and XPS. The PUCP1 exhibits a 2D framework with an uninodal 4-connected net and sql topology. The PUCP1@rGO was applied as a sensitive and selective photocatalyst for significant degradation of Safranin-O (SO) dye. The rGO played an important role in the expansion of photocatalytic activity of the PUCP1 by inhibiting the recombination probability of electron–hole pairs. The results revealed that PUCP1@rGO nanocomposite can degrade 76% of SO dye in only 90 min under visible light at a neutral pH. The PUCP1@rGO was found very sensitive to photocatalytic degradation of SO dye because a very small amount of catalyst (i.e. 10 mg) degrades the 5 μM concentration of SO dye in the presence of light. The PUCP1@rGO is a reusable photocatalyst for up to 5 cycles. Rarely, any sensitive photocatalyst for SO dye is reported in literature than PUCP1@rGO which degrades SO dye in a very small period with significant quantity. Thus, PUCP1@rGO can be used as a promising photocatalyst for the degradation of SO dye. In this work, we have synthesized a novel coordination polymer (PUCP1) and nanocomposite (PUCP1@rGO) by impreganation of rGO in PUCP1 framework.The PUCP1 exhibited selective photocatalytic response towards safranin-O dye under visible light irradiation and impregnation of rGO enhance the photocatalytic properties of PUCP1@rGO nanocomposite as compared to parent PUCP1.The PUCP1@rGO nanocomposite degrade the safranin-O dye up to 76% in 90 min only under visible light. [ABSTRACT FROM AUTHOR]

Green synthesis of a copper-based coordination polymer (Cu-CP) is reported utilizing a simple precipitation method. The prepared coordination polymer was characterized and used as a potent adsorbent for the elimination of organic dyes from aqueous solutions. The results of zeta potential analysis showed that the surface charge of the Cu-CP was −33.6 mV. In spite of negative surface charge and moderate specific surface area (99 m2·g−1), the prepared Cu-CP was a good adsorbent for removal of cationic e.g., malachite green (MG) and methylene blue (MB) as well as an anionic dye e.g., Congo red (CR). This efficiency could be attributed to π-π interaction and hydrogen bonding between adsorbent and adsorbate as the major forces leading to uptake of the dyes. However, MG with high removal efficiency (85.44%) at 2 min was chosen as a targeted dye for further consideration. Then, the effect of various parameters for adsorption of the MG e.g., adsorbent amount, pH, and initial concentration of dye were optimized. The adsorption isotherm and kinetic model for MG adsorption were also investigated. Finally, the adsorbent was reused after recycling which indicated high MG removal efficiency in successive tests. [ABSTRACT FROM AUTHOR]

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]

A highly stable three-dimensional (3D) silver chloride cluster based coordination polymer (CP) with diphosphines ligand with the formula of [Ag4Cl4(L)2]n (1) (L = 1,3-bis(diphenylphosphino)propane, bdpp) has been prepared at room temperature. 1 was examined for the removal of Rhodamine B in aqueous solution, exhibiting potential for the removal of contaminants from wastewater. [ABSTRACT FROM AUTHOR]

A novel cobalt-based coordination polymer generates superoxide radicals under visible light to accelerate photocatalytic degradation of organic dyes. [Display omitted] It is crucial to construct an effective photocatalyst for the removal of dyes from aqueous environments. In the present work, a novel cobalt-based coordination polymer was synthesized and characterized with the molecular formula [Co(ipa)(ptt)] n (Co-CP), (ipa = isophthalic acid, ptt = 5-(4-Pyridyl)-1H-tetrazole). In Co-CP , each cobalt ion is in a six-coordination mode and is connected to two adjacent ligands to form a three-dimensional network structure. Furthermore, Co-CP excellent degradation properties and can effectively degrade methylene blue (MB) and rhodamine B (Rh B) under visible light with degradation efficiencies of 84.3 % and 94.6 %, respectively. Additionally, its PXRD patterns and FTIR spectra remained consistent with the original complex after three cycles, which proved that it was very stable, and there was no significant decrease in degradation ability after three cycling cycles, indicating its excellent reusability. The photocatalytic degradation mechanism was subsequently rationalized through free radical trapping experiments and analysis the energy band structure of Co-CP. [ABSTRACT FROM AUTHOR]

A new coordination polymer (CP) [Co(HTATB)(H2O)](DMF)2 (1, DMF = N,N-dimethylformamide) based on the {Co2(CO2)4} binuclear secondary building unit (SBU) has been successfully prepared by using a light-harvesting triphenylamine type organic ligand 4,4′,4″-s-triazine-2,4,6-triyltribenzoic acid (H3TATB). Furthermore, complex 1 has significant photocatalytic activity under visible light for the degradation of organic dyes such as rhodamine B (RhB), methylene blue (MB) as well as methyl orange (MO) assisted by H2O2. Furthermore, the anti-osteoporosis activity of complex 1 was evaluated. First, the inhibitory effect of complex 1 on the BMSCs apoptosis was measured by Annexin V-FITC/PI method. Then, the RT-PCR was performed to detect the relative expressions level of wnt/β-catenin and PPARγ after complex 1 treatment. The hypothesis that arises from the experimental observation has been further investigated by using molecular docking simulation, where the possible binding interactions between the ligand and Wnt protein are studied explicitly. [ABSTRACT FROM AUTHOR]

Two novel coordination polymers (CPs) containing Co(II) with the compositions of [Co(L)(2,2′‐bipy)]n (1) and [Co(L)(4,4′‐bipy)4 ⋅ 2H2O]n (2) have been prepared via utilizing bipyridine (2,2′‐bipy for 1 and bipy, 4,4′‐bipy for 2) and the ligand of 1,4‐bis(3‐carboxylbenzyl)piperazine acid (H2L) as the co‐ligand under the hydrothermal conditions. In addition, the photodegradation of organic dyes performances for complex 1 and complex 2 have been studied. It is important that complex 2 reveals excellent dye adsorption and photodegradation performances. In addition, their protective activity on sepsis was assessed and the specific mechanism was discussed detailly. Firstly, the TNF‐α and IL‐1β content released via immune cells was detected through the ELISA detection kit after treated by compounds 1 and 2. Next, the activation level of NF‐κB signaling pathway in the macrophages was determined via western blot. [ABSTRACT FROM AUTHOR]

A Cu(I) coordination polymer, {[Cu4Br(ttpe)3]Br2·(OH)}n (1), was prepared and characterized by single crystal X-ray diffraction analysis, EA, IR, PXRD, luminescence, optical band gaps and VB XPS spectra (ttpe = 1,1,2,2-tetrakis[4-(1H-1,2,4-triazol-1-yl)phenyl]ethylene). 1 presents a two-fold interpenetrating (4,12)-connected 3D topology containing the [Cu4Br] tetranuclear copper(I) cluster building block with a point symbol of {44.62}3{424.640.82}. Eg, Ev and Ec of 1 were 2.20, 0.74 and −1.46 eV, respectively. 1 can act as a good photocatalyst for degradation of organic dyes. The photocatalytic mechanism was studied. [ABSTRACT FROM AUTHOR]

By employment of a rigid tripodal nitrogen-containing heterotopic ligand tris(1-imidazolyl) benzene (Htib), a new fluorescent Zn(II)-containing coordination polymer {[Zn(tib)2](NO3)2(H2O)3}n (1) with a rare two-fold interpenetrating (3,6)-connected pyr network topology has been successfully prepared under the solvothermal reaction conditions. Under the condition of visible light irradiation, rhodamine B (RhB) and methylene blue (MB) could be degraded with good performance. In the biological function study, the cytotoxicity of the synthetic was evaluated with CCK-8 detection kit on human umbilical vein endothelial cells (HUVEC). The inhibitory effect of compound on vcam-1 expression in the vascular endothelial cells was evaluated by RT-PCR. The effect of the complex on the inflammatory response in the vascular endothelial cells was determined via ELISA test of IL-1ß and TNF-a. The results of pose scoring software as well as molecular docking was conducted to explore the interaction between compounds and VCAM, which might provide latent regulatory mechanisms along with binding sites for compounds. [ABSTRACT FROM AUTHOR]

A copper(II) coordination polymer {[Cu(itp)(ip)][Cu 4 (OH) 2 (itp)(ip) 3 ]·4H 2 O} n ( 1 ) (itp = 1-imidazol-1-yl-3-(1,2,4-triazol-4-yl)propane, ip = isophthalate) was synthesized and characterized. 1 exhibits an intriguing 2-fold interpenetrating array of (4,6)-coordinated 3D nets of the fsc topological type, which are based on the 4-coordinated single copper(II) and 6-coordinated tetranuclear hydroxy copper(II) [Cu 4 (μ 3 -OH) 2 ] cluster. 1 is a highly efficient and universal photocatalyst for the degradation of the organic dyes methylene blue (MB), rhodamine B (RhB) and methyl orange (MO) under visible light irradiation. Electrochemical performance of 1 was also measured. [ABSTRACT FROM AUTHOR]

Two copper(II) coordination polymers, {[Cu2(btre)(hsuc)Cl(H2O)]·1.5H2O}n (1) and {[Cu2(btre)(hsuc)Br(H2O)]·1.5H2O}n (2) (btre = 1,2-bis(1,2,4-triazol-4-yl)ethane, H3hsuc = 2-hydroxysuccinic acid), were synthesized by the hydrothermal method via in situ hydroxylation reaction with fumarate (fum), btre and CuCl2/CuBr2, and characterized by elemental analyses, IR, TG and X-ray diffraction. 1 and 2 are isostructural and show a 4-connected 2-D network based on [Cu2O] dimers. 1 and 2 show good photocatalytic activity for the degradation of organic dyes methylene blue and methyl orange under UV light irradiation. [ABSTRACT FROM AUTHOR]

The copper(II) coordination polymer [Cu 2 (bix)(sdc) 2 ] n ( 1 ) was synthesized by the hydrothermal method (bix = 1,4-bis(2-methyl-imidazol-1-ylmethyl)benzene, sdc = 2,5-thiophenedicarboxylate). The copper(II) atom of 1 shows unsaturated square-pyramidal configuration. 1 exhibits the 2-fold interpenetrating three-dimensional pcu network based on the [Cu 2 (COO) 4 ] dimers. 1 is an efficient and universal photocatalyst for the degradation of the organic dyes methylene blue (MB), rhodamine B (RhB) and methyl orange (MO) under visible light irradiation, and is very stable and can be reused. [ABSTRACT FROM AUTHOR]

A novel two-dimensional zinc-based coordination polymer produces hydroxyl radicals and superoxide radicals in visible light to accelerate the elimination of dyes from water. [Display omitted] A novel two-dimensional zinc-based coordinated polymer was successfully synthesized with the assistance of solvothermal method, which named as {Zn(HL)(H 2 O) 2 } n (1) (Where H 3 L = 4-(2,4-dicarboxylphenyl)picolinic acid). Under visible light, the coordination polymer exhibits excellent photocatalytic properties and can effectively eliminate organic dyes such as rhodamine B (Rh B) and methyl orange (MO) from aqueous solutions. In addition, to explore the photocatalytic mechanism, the radical-active species in the photocatalytic reaction process were analyzed with the assistance of three different radical trapping agents, and the in-depth mechanisms was discussed with the contribution of density functional theory calculations. [ABSTRACT FROM AUTHOR]

Two intriguing coordination polymers [Cu 2 (OH)( mbtx )( sip )(H 2 O) 2 ] n ( 1 ) and {[Cu 3 (OH) 2 ( mbtx )( nip ) 2 ]·H 2 O} n ( 2 ) were synthesized by the hydrothermal method and characterized by elementary analysis, IR, PXRD, diffuse reflectance spectra and single-crystal X-ray diffraction ( mbtx = 1,3-bis(1,2,4-triazol-4-yl)benzene, sip = sulfoisophthalate, nip = 5-nitroisophthalate). 1 shows an unusual 3-connected 2D network based on the dimeric hydroxy-copper(II) cluster [Cu 2 ( μ -OH)] with the point symbol of 6 3 . 2 exhibits an unusual 3D network based on 1D hydroxyl-copper(II) chains [Cu 3 (OH) 2 ] n . 1 and 2 are highly efficient and universal photocatalysts for the degradation of the organic dyes such as methyl orange (MO), methylene blue (MB) and rhodamine B (RhB) under UV irradiation. The photocatalytic mechanism was supposed. [ABSTRACT FROM AUTHOR]

Two new coordination polymers (CPs), namely, [Cu 2 ( ttbz )(H 2 btc) 2 (OH)] n ( 1 ) and [Mn(ttbz) 2 (H 2 O) 2 ] n ( 2 ) ( Httbz =1-(tetrazo-5-yl)-4-(triazo-1-yl)benzene, H 3 btc =1,3,5-benzenetricarboxylic acid), have been hydrothermally synthesized and structurally characterized. Complex 1 exhibits a (3,5,5,5)-connected 2D layer with a Schläfli symbol of {3·4 2 }{3·4 4 0.5 2 0.6 3 }{3 2 0.4 4 0.5 2 0.6 2 }{3 2 0.4 4 0.5 3 0.6}, in which the ttbz - ligand can be described as μ 5 -bridge, linking Cu(II) ions into a 2D layer and H 2 btc - ions play a supporting role in complex 1 . The ttbz - ligand in complex 2 represents the bridging coordination mode, connecting two Mn(II) ions to form the infinite 1D zigzag chains, respectively, which are further connected by two different types of hydrogen bonds to form a 3D supramolecular. Furthermore, catalytic oxidation activities toward organic dyes and electrochemical behaviors of the title complexes have been investigated at room temperature in aqueous solutions, indicating these complexes may be applicable to color removal in a textile wastewater stream and practical applications in areas of electrocatalytic reduction toward nitrite, respectively. [ABSTRACT FROM AUTHOR]

One new Co-based coordination polymer with a bidentate imidazole ligand, 4,4′-bisimidazolylbiphenyl (4,4′-bibp), and a 1,4-benzenedicarboxylate (1,4-bdc) co-ligand, [Co(bibp)(bdc)] n ( 1 ) has been synthesized under hydrothermal conditions. For complex 1 , the mixed ligands linked the Co(II) ions to form a three dimensional 4-connected net with a rare dmp topology, in which a large cavity causes 3-fold interpenetration of the network. Dye adsorption studies confirmed that 1 can selectively adsorb the organic dyes methyl orange, methyl blue, neutral red, Sudan I and methylene blue, but hardly adsorb Safranine T. [ABSTRACT FROM AUTHOR]

A highly stable condensed three-dimensional framework, [Zn(2,6-ndc)(H 2 O)] (Zn-ndc , 2,6-ndc = naphthalene-2,6-dicarboxylate, CSD entry: MIMRAB; CCDC no: 182255), and its post-modified Cu/Zn bimetallic analogue [Cu x Zn 1− x (2,6-ndc)(H 2 O)] (CuZn-ndc , x = 0.45 −0.49) showed remarkably catalytic activity to greatly improve the degradation performances of organic dyes including malachite green (MG), methylene blue (MB), and methyl orange (MO) in the presence of H 2 O 2 without and with natural light illumination. The dye degradation over Zn-ndc and CuZn-ndc both followed the order MG > > MB > MO. In addition, CuZn-ndc displayed greater photocatalytic degradation activity compared to Zn-ndc , resulting in faster degradation rate and higher degradation efficiency. Zn-ndc and CuZn-ndc both retained the crystallinity and photocatalytic activity to degrade MG, MB, and MO dyes over five consecutive usages, implying long-term stability and reusability. Of note, pH exerted an effect on the surface charge of Zn-ndc and CuZn-ndc to decrease dye degradation performances of MB and MO but not MG as the decrease of pH. Further, CuZn-ndc had more negative charges on the surface than Zn-ndc , which provided higher affinity toward dyes and thus facilitated dye degradation. Explorations on mechanism provened that the dye degradation was a H 2 O 2 -trigged oxidative degradation process, thus more H 2 O 2 dosage led to higher short-term degradation performances. Moreover, incorporation of Cu(II) would significantly reduce band gap energy of photo-assisted catalysts and also lead to a Cu-based photo-Fenton redox cycle, both of which would produce more hydroxyl radicals and photo-generated holes and electrons as active species. This greatly enhanced the photocatalytic activity to improve the performance of dye degradation process. [Display omitted] • Zn-ndc and CuZn-ndc have greatly improved the performance of H2O2-trigged dye degradation. • CuZn-ndc has showed higher catalytic activity than Zn-ndc to degrade organic dyes. • Dye degradation over Zn-ndc and CuZn-ndc both follow the order MG > > MB > MO. • Zn-ndc and CuZn-ndc have displayed good long-term activity and stability for dye degradation. • Hydroxyl radicals (•OH) and photo-generated holes (h+) and electrons (e–) are the active species. [ABSTRACT FROM AUTHOR]

In this work two new coordination polymers (CPs) with formulas [Zn 2 (Cl)(BTC)(bmb) 2 ] (1) and [Cd 2 (H 2 O) 2 (BTC) 2 ·H 2 bmb·6H 2 O] (2) (bmb=1,4-bis(2-methylimidazol-1-yl)butane and H 3 BTC ​= ​1,3,5-benzenetricarboxylic acid), have been prepared and characterized by various spectroscopic data. The single crystal X-ray data suggests that 1 comprises a 2D layered network and 2 has a 3D porous framework with pcu -type topology. The photocatalytic properties revealed that 2 could successfully degrade organic dyes such as Rhodamine B (Rh B), methylene orange (MO), and methylene blue (MB). Further, the trapping experiment established the active species in the photodegradation process. [Display omitted] • Two new MOFs were synthesized using mixed strategy. • The two MOFs were modulated by synthesized temperature. • Photocatalytic capability was demonstrated for the MOFs. • The photodegradation process was estimated by trapping experiment. [ABSTRACT FROM AUTHOR]

A new coordination polymeric chains modified polyoxometalate, H 3 K 2 [Ag 5 (DTB) 5 [SiW 12 O 40 2 ·Cl 2 ·8H 2 O (1) {DTB ​= ​1,4-di(1H-1,2,4-triazol-1-yl)benzene}, has been successfully synthesized under hydrothermal conditions. Single crystal X-ray diffraction analyses reveal that the Keggin POM cluster is modified by {Ag(DTB)} n chains in an unusually [2 ​+ ​4] asymmetrical mode resulting in a 2D double layer structure. By connection of K cations and π···π interactions between adjacent {Ag(DTB)} n coordination polymeric chains, the 2D structure extends to a 3D structure. In addition, crystal 1 can be used as a packing material for the highly selective adsorption and separation cationic dyes such as methylene blue (MB) and crystal violet (CV) against with methyl orange (MO) anionic dyes. The adsorption of a series of cationic organic dyes experiment demonstrated that this process is highly related to the sizes of organic dyes. A new coordination polymeric chains modified polyoxometalates with rare [2+4] asymmetrical mode has been isolated under hydrothermal conditions. Obtained compound can be used as a packing material for the highly selective adsorption and separation cationic dyes such as methylene blue (MB) and crystal violet (CV) against with methyl orange (MO) anionic dyes. Image 1 • A new coordination polymeric chains modified polyoxometalates was synthesized. • Title compound represents an unusually example of [2 ​+ ​4] asymmetrical mode based on {Ag(DTB)} n chains. • Title compound could act as stationary phase to selectively adsorb cationic dyes over anionic dye. [ABSTRACT FROM AUTHOR]

A Co(II)-based coordination polymer has been synthesized, characterized by X-ray, spectral and magnetic studies, and explored for degrading organic pollutants. • A one-dimensional cobalt(II)-based coordination polymer (Co-CP) has been designed and characterized. • Co-CP reveals strong antiferromagnetic interactions between neighboring atoms. • Co-CP shows promising material importance for the photodegradation of organic pollutants. • Based on a scavenging investigation, a mechanism for the excellent photocatalytic efficiency has been determined. • The present material also has the benefits of extra stability and recyclability. In this work, a one-dimensional (1-D) cobalt(II)-based coordination polymer, [Co(SCN) 2 (peol)] n (H 4 peol = pentaerythritol and NCS− = thiocyanate), was synthesized under solvothermal conditions. Elemental, FTIR, UV–Visible, PXRD, TGA, magnetic and single-crystal X-ray diffraction analyses characterized the polymer (Co-CP). Further, scanning electron microscopy (SEM) was employed to understand the outer morphology of Co-CP. The material importance of Co-CP was investigated by studying its magnetic and photodegradation properties. Variable temperature magnetic data of Co-CP unveiled the existence of strong antiferromagnetic interactions coupled with anisotropy in the system, with parameters C = 2.71 cm3 K mol−1 and θ = −6.43 K. Furthermore, Co-CP has been effectively used as a photocatalyst for the degradation of organic pollutants methylene blue (MB) and rhodamine-B (Rh-B) in the aqueous phase, with good recyclability. Co-CP exhibits unusual photocatalytic activity toward the degradation of the solid organic dyes. Based on a scavenging investigation, a plausible mechanism for the photocatalytic activity has also been proposed. [ABSTRACT FROM AUTHOR]

• Two different structural frameworks have been designed and synthesized. • Photocatalytic studies show both of them have efficient degradation activity of organic dye methyl violet. • The possible mechanism of the photocatalytic property has been suggested. Two new CoII-based coordination polymers tuned by the flexible "V"-shaped 3,3ˊ-(1,2-phenylenebis(methyleneoxy)) dibenzoic acid (H 2 L) and different N -donor spacers, namely, [Co(L)(bib)] n (1) and [Co 2 (L) 2 (phen) 2 (H 2 O) 2 ·H 2 O] n (2) (bib = 1,4-bis(1-imidazoly)benzene and phen = 1,10-phenanthroline) have been prepared. In 1, the CoII centers are linked by L to form a Co–L chain, which is further extended into a 2D wave-like layer by bib linkers. In 2 , the L linker connected the adjacent Co(II) centers into 1D chain, which is joined into a 3D supramolecular structure through H-bonded and π–π stacking interactions. The diverse networks of 1–2 demonstrate that the steric hindrance effect may show significant effect on the final structures. In addition, the title complexes exhibit photocatalytic activity for dye methyl violet (MV) degradation under UV light. [ABSTRACT FROM AUTHOR]

Two Zn-based coordination polymers were synthesized successfully and were used as highly efficient heterogeneous photocatalysts for the removal of Cr(VI) ions and organic dyes upon UV light irradiation. • Coordination polymers (CPs) have been synthesized under hydrothermal conditions. • The two CPs achieved good photocatalytic Cr(VI) reduction under UV light. • The two CPs accomplished robust photocatalytic dyes degradation under UV light. • The two CPs showed photocatalytic activities toward the Cr(VI)/organic dye matrix. Two new coordination polymers, ZnL(2,2′-bpy)·(H 2 O) (BUC-85) and ZnL(bpa)·(H 2 O) (BUC-86) (H 2 L = cis -1,3-dibenzyl-2-imidazolidone-4,5-dicarboxylic acid, 2,2′-bpy = 2,2′-bipyridine, bpa = 1,2-bis(4-pyridyl)ethane), were synthesized under solvothermal conditions. The abilities of both BUC-85 and BUC-86 were tested for photocatalytic Cr(VI) reduction and organic pollutant degradation under UV light. The results revealed that both BUC-85 and BUC-86 displayed superior catalytic Cr(VI) reduction performances, with reduction efficiencies up to 99% within 40 min under UV light irradiation. As well, BUC-85 and BUC-86 could photocatalytically decompose organic dyes, in which the oxidative degradation efficiencies toward methylene blue were 100% (BUC-85) and 99% (BUC-86) under irradiation of UV light for 60 min. Finally, a possible photocatalytic reaction mechanism has been proposed and verified. [ABSTRACT FROM AUTHOR]

• O-g-C 3 N 4 @zinc-terpyridyl coordination polymer (CP) nano-composites were constructed. • Recombination of excited charge carriers was inhibited by zinc-terpyridyl CPs. • Photocurrent generation was over 5 times increased. • Photocatalytic efficiency on the degradation of organic dyes was enhanced. Graphite-like carbon nitride (g-C 3 N 4)-based nanocomposites with zinc terpyridyl (ZnTPy) coordination polymers (CPs) were developed for photo-induced current generation and the catalytic degradation of organic dyes. The oxidized g-C 3 N 4 nanoparticles (O-g-C 3 N 4) were reacted with silane and terpyridyl benzyl bromide (TPyBenBr) to form O-g-C 3 N 4 TPy nanohybrids, which then acted as a support for the construction of O-g-C 3 N 4 -based nanocomposites, using Zn(CF 3 SO 3) 2 as a connector, and bidentate ligand of 1,4-di([2,2′:6′,2′'- terpyridin]-4′-yl)benzene (BTPy) as a linker, respectively. The luminescent emission features revealed that the recombination of charged carriers was inhibited in the O-g-C 3 N 4 @(ZnBTPy) n nanocomposites. As a consequence, the photocurrent density for the electrode, modified by the developed nanocomposites, was about 5.6 times higher than that modified by the original O-g-C 3 N 4 particles; furthermore, their catalytic degradation efficiency for methyl orange (MO) and Congo red (CR) was about 20–25 times higher than that for the original O-g-C 3 N 4 nanoparticles. The improved performance was attributed to the fact that, in addition to their enhanced absorption ability, the ZnBTPy CP films could effectively improve the electron transfer efficiency and generation of O 2 − radicals on the surfaces of the nanocomposites. [ABSTRACT FROM AUTHOR]

Several important synthesis pathways for metal-organic frameworks (MOFs) were applied to determine how the synthesis methods and conditions affect the structure and adsorption capacity of the resulting samples. In the present work, three different synthesis routes were used to obtain copper trimesinate coordination polymer: Slow evaporation (A), solvothermal synthesis using a polyethylene glycol (PEG-1500) modulator (B), and green synthesis in water (C). This MOF was characterized by elemental analysis, infrared spectrometry, X-ray diffraction, scanning electron microscopy, thermogravimetry and volumetric nitrogen adsorption/desorption. The samples have permanent porosity and a microporous structure with a large surface area corresponding to the adsorption type I. The obtained MOF was tested as a sorbent to remove organic dyes methylene blue (МВ), Congo red (CR) and methyl violet (MV) as examples. Dye adsorption followed pseudo-first-order kinetics. The equilibrium data were fitted to the Langmuir and Freundlich isotherm models, and the isotherm constants were determined. Thermodynamic parameters, such as changes in the free energy of adsorption (∆G0), enthalpy (∆H0), and entropy (∆S0), were calculated. Thermolysis of copper trimesinate leads to the formation of carbon materials Cu@C with a high purity. [ABSTRACT FROM AUTHOR]

A silver(I) coordination polymer, [Ag(L)(HNTP)] n (1) (L = 1,4-bis(5,6-dimethylbenzimidazol-1-yl)butane, H 2 NTP = 2-nitroterephthalic acid) was hydrothermally synthesized and characterized. 1 is a 1D linear chain which is further extended into a 3D supramolecular framework by hydrogen bond interactions. 1 exhibits highly sensitivity for detecting Cu2+ ion. 1 also presents high photocatalytic activities for the degradation of methylene blue (MB) and methyl orange (MO). A one-dimensional Ag(I) coordination polymer (CP), [Ag(L)(HNTP)] n (1) (L = 1,4-bis(5,6-dimethylbenzimidazole)butane, H 2 NTP = 2-nitroterephthalic acid) was hydrothermally synthesized and characterized. 1 exhibits highly sensitivity and selectivity for detecting Cu2+ in aqueous solution and presents high photodegradation efficiency for MB and MO under UV irradiation. Unlabelled Image • 1D linear silver(I) coordination polymer was hydrothermally synthesized and characterized. • 1 is further extended into a 3D supramolecular framework by hydrogen bond interactions. • 1 exhibits highly sensitive and selective for detection of Cu2+. • 1 reveals high photocatalytic activity for degradation of MB/MO. [ABSTRACT FROM AUTHOR]