Carboxylate ligands induced structural diversity of zinc(II) coordination polymers based on 3,6-bis(imidazol-1-yl)carbazole: Syntheses, structures and photocatalytic properties

Solvothermal reactions of Zn(NO3)(2)center dot 6H(2)O with 3,6-bis(1-imidazolyl)carbazole (3,6-bmcz) and 1,4-benzenedicarboxylic acid (1,4-H(2)bdc), p-phenylenediacetic acid (p-H(2)pda), benzophenone-4,4-dicarboxylic acid (H(2)bpda) afforded three coordination polymers [Zn(1,4-bdc)(3,6-bmcz)](n) (1), aZn(P-pda)(3,6-bmcz)]center dot 1.5H(2)O}(n) (2) and {[Zn(bpda)(3,6-bmcz)]center dot 0.25H(2)O}(n) (3). Complexes 1-3 were characterized by elemental analysis, IR, powder X-ray diffraction, and single-crystal X-ray diffraction. Complex 1 shows 3D structure with 2D nets inclined polycatenation. Complexes 2 and 3 possess an extended 3D supramolecular architecture based on their respective 2D layers through hydrogen-bonding interactions and the pi center dot center dot center dot pi stacking interactions. The solid state luminescent and optical properties of 1-3 at ambient temperature were also investigated. A comparative study on their photocatalytic activity toward the degradation of methylene blue in polluted water was explored. (C) 2015 Elsevier Inc. All rights reserved.