Metal−Organic Frameworks Based on Different Benzimidazole Derivatives: Effect of Length and Substituent Groups of the Ligands on the Structures

Seven coordination polymers constructed from structurally related ligands, namely, [Cd2(ODPT)(L1)(H2O)2]·H2O (1), [Cd2(ODPT)(L2)(H2O)2] (2), [Zn2(BPTC)(L3)]·(H2O)3 (3), [Cd(m-BDC)(L4)] (4), [CdL5] (5), [CdL6]·H2O (6), and [ZnL6]·H2O (7) (H4ODPT = 4,4′-oxidiphthalic acid, H4BPTC = 3,3′,4,4′-benzophenone tetracarboxylate ligand, H2m-BDC = 1,4-benzenedicarboxylate acid, L1 = 1,4-di(1H-benzo[d]imidazol-2-yl)butane, L2 = bis((1H-benzo[d]imidazol-2-yl)methyl)amine, L3 = 1,4-bis(1-(pyridin-4-ylmethyl)-1H-benzo[d]imidazol-2-yl)butane, L4 = bis((1-(pyridin-4-ylmethyl)-1H-benzo[d]imidazol-2-yl)methyl)amine, H2L5 = 4,4′-(2,2′-(butane-1,4-diyl)bis(1H-benzo[d]imidazole-2,1-diyl))bis(methylene)dibenzoic acid, and H2L6 = 2,2′-(2,2′-azanediylbis(methylene)bis(1H-benzo[d]imidazole-2,1-diyl))diacetic acid) 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 (...