Syntheses, Structures, Luminescent and Gas Adsorption Properties of Five New Interpenetrated, 2D and 3D Metal–organic Frameworks Based on a Semi-Rigid Bis(imidazole)-Carbazole Ligand

We have succeeded in constructing five metal-organic frameworks, [Zn(L)SO4] (1), [Zn(L)(bdc)]center dot H2O (2), [Zn(L)(abdc)]center dot 0.5H(2)O (3), [Zn(L)(oba)]center dot 2H(2)O (4) and [Zn(L)(2)(suc)(2)] (5), based on a semi-rigid bis(imidazole)-carbazole ligand [9-ethyl-3,6-di(1H-imidazol-1-yl)-9H-carbazole (L)] and five rigid/flexible dicarboxylic acids (DPac = 2,6-pyridine dicarboxylic acid, H(2)bdc = p-phthalic acid, H(2)abdc = azobenzen-4,4'-dicarboxylate, H(2)oba = 4,4-oxybisbenzoic acid and H(2)suc = succinic acid). Complexes 1-5 were characterized by single crystal X-ray diffraction, elemental analysis, power X-ray diffraction (PXRD), IR spectroscopy and thermogravimetry. Complex 1 possesses a two-dimensional (2D) network which is constructed not by the co-ligand acid but by a sulfate anion. Both complexes 2 and 3 are two-dimensional (2D) sheet structures with 2D -> 3D polycatenation frameworks. Coordination polymer 2 contains interconnected 70-membered macrocycles and 3 forms a double helix-like 4-fold interpenetrated network. Complex 5 exhibits a three-dimensional (3D) sra network. The luminescent properties of 1-5 in the solid state and gas adsorption properties of 3 and 5 were also investigated. (C) 2015 Published by Elsevier Ltd.