A 3D 4-coordinated self-catenated metal-organic framework {[Co(bibp)(1,4-chdc)]·2H2O}n (1) (bibp = 4,4'-bis(1-imidazolyl)biphenyl, 1,4-H2chdc = 1,4-cyclohexanedicarboxylic acid) has been synthesized by hydrothermal reaction and its structure has been determined. This framework buries an unprecedented 4-coordinated self-catenated net that can be represented as an array of honeycomb-like units catenated in an inclined mode, with the highest topological density among the 4-coordinated nets that occur in crystal structures. Additionally, the thermogravimetric, photo-catalytic and electrochemical behaviors have been investigated.
Two new cobalt(II) coordination polymers, {[Co(L1)(tbta)]·0.8H2O}n (1) and {[Co(L2)(tbta)]·H2O}n (2) [L1 = 1,1′‐(1,3‐propanediyl)bis(2‐methylbenzimidazole), L2 = 1,2‐bis(2‐methylbenzimidazole‐1‐ylmethyl)benzene, H2tbta = tetrabromoterephthalic acid] were obtained under hydrothermal conditions and structurally characterized by single‐crystal X‐ray diffraction methods, IR spectroscopy, TGA, and elemental analysis. The cobalt atoms present similar environments with tetrahedral arrangements in 1 and 2. The two complexes show a 2D (4,4) coordination network with sql topology. Compound 2 is further extended into a rare 3,3,4T3 three‐dimensional supramolecular framework by weak C–H···O hydrogen bonding interactions. The fluorescence and catalytic properties of the complexes for the degradation of the congo red azo dye in a Fenton‐like process were investigated.
Two nickel(II) coordination polymers, formulated as {[Ni 2 (bix) 2 (tbta) 2 (H 2 O) 4 ]·0.25H 2 O} n (1) and [Ni 2 (bix)(aip) 2 (H 2 O) 2 ] n (2) [bix = 1,4-bis(imidazol-1-ylmethyl)benzene, H 2 tbta = tetrabromoterephthalic acid, H 2 aip = 5-aminoisophthalic acid] were synthesized under hydrothermal conditions and structurally characterized by single-crystal X-ray diffraction methods, IR spectroscopy, TGA, and elemental analysis. Complex 1 exhibits a 2D (4,4) layer with {4 4 .6 2 } 41 topology. Complex 2 shows 2D (3,4)-connected 3,4L83 sheets, which are finally extended into an unusual (5,6)-connected 3D supramolecular network by classic hydrogen bond interactions. Fluorescence, UV/ Vis diffuse reflection spectra, and catalytic properties of two complexes for the degradation of the methyl orange dye in a photo-Fentonlike process were investigated.
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