Structures and Luminescent Properties of Seven Coordination Polymers of Zinc(II) and Cadmium(II) with 3,3′,4,4′-Benzophenone Tetracarboxylate Anion and Bis(imidazole)

Seven coordination polymers, namely [Zn(BPTC)0.5(L1)0.5(H2O)] (1), [Zn2(BPTC)(L2)]·H2O (2), [Zn2(BPTC)(L3)2]·3H2O (3), [Zn2.5(BPTC)(L4)(OH)(H2O)] (4), [Zn2(BPTC)(L5)(H2O)2]·3H2O (5), [Cd2(BPTC)(L5)(H2O)]·H2O (6), and [Cd(BPTC)0.5(L6)]·H2O (7), where L1 = 4,4′-bis(imidazol-1-ylmethyl)bibenzene, L2 = 4,4′-bis(imidazol-1-ylmethyl)benzene, L3 = 1,4-bis(imidazol-1-yl)butane, L4 = 1,4-bis(2-ethyl-imidazol-1-yl)butane, L5 = 1,3-bis[2-(2-pyridyl)imidazol-1-ylmethyl]benzene, L6 = 1,2-bis[2-(2-pyridyl)imidazol-1-ylmethyl]benzene, and BPTC = 3,3′,4,4′-benzophenone tetracarboxylate ligand, have been synthesized under hydrothermal conditions. Their structures have been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra, and thermogravimetric analyses. The structure of 1 exhibits a (4,6)-connected network with a (44·62)(44·610·8) topology formed by L1 ligands connecting BPTC−Zn sheets. The structure of 2 is a chiral 3D network in which there exists a Zn−O...