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Two new Cd(II) complexes, {[Cd(m-bdc)(tmb)(H2O)]·CH3OH}n (1) and {[Cd(t-bdc)(tmb)(H2O)] ·2H2O·DMF}n (2), have been prepared by using 2-((1H-1,2,4-triazol-1-yl)methyl)-1Hbenzimidazole (tmb) as a ligand in the presence of 1,3-benzenedicarboxylic acid (m-H2bdc) or 1,4-benzenedicarboxylic acid (t-H2bdc). Single-crystal X-ray diffraction exhibits that complex 1 displays a 2D structure constructed by tmb ligands in trans conformation and carboxylate groups in a chelating mode. The 2D structure of complex 2is different from that of 1, in that the tmb ligands are in cis conformation, and the carboxylate groups are in both unidentate or chelating coordination mode at the Cd(II) centers. The luminescence properties of 1and 2in the solid state at room temperature have been studied

Three Cd(II)-containing coordination polymers [CdCl2(tmb)]n (1) and two polymorphs of {[CdI2(tmb)]·DMF}n (2, 3) (tmb = 2-((1H-1,2,4-triazol-1-yl)methyl)-1H-benzimidazole) have been synthesized by the reactions of tmb with the cadmium salts. Polymer 1 exhibits an infinite · · ·Cd- (Cl1)2-Cd-(Cl2)2-Cd· · · chain with μ2Cl bridges, while polymers 2 and 3 are isomers, in which the Cd(II) ions are bridged by the bidentate tmb ligands leading to · · ·Cd-tmb-Cd· · · chains. The polymers form 3-D supramolecular frameworks through hydrogen bonds and π · · ·π stacking interactions. The different structures of polymers 1 - 3 indicate that the anions and the flexibility of the tmb ligand can influence the structures of the coordination polymers. The infrared spectra and luminescent properties of the polymers have been investigated in the solid state at room temperature