A new one-dimensional Cd II coordination polymer incorporating 2,2'-(1,2-phenylene)bis(1H-imidazole-4,5-dicarboxylate)

• Published in: Acta crystallographica. Section C, Structural chemistry Structural chemistry, 2018-10, Vol.74 (Pt 10), p.1128-1132
• Main Authors: Liu, Yan Ju, Cheng, Di, Li, Ya Xue, Zhang, Jun Di, Yang, Huai Xia
• Format: Article
• Language: English
• ISSN: 2053-2296; 2053-2296
• DOI: 10.1107/S2053229618012603

Imidazole-4,5-dicarboxylic acid (H IDC) and its derivatives are widely used in the preparation of new coordination polymers owing to their versatile bridging coordination modes and potential hydrogen-bonding donors and acceptors. A new one-dimensional coordination polymer, namely catena-poly[[diaquacadmium(II)]-μ -2,2'-(1,2-phenylene)bis(1H-imidazole-4,5-dicarboxylato)], [Cd(C H N O ) (H O) ] or [Cd(H Phbidc) (H O) ] , has been synthesized by the reaction of Cd(OAc) ·2H O (OAc is acetate) with 2,2'-(1,2-phenylene)bis(1H-imidazole-4,5-dicarboxylic acid) (H Phbidc) under solvothermal conditions. In the polymer, one type of Cd ion (Cd1) is six-coordinated by two N atoms and two O atoms from one H Phbidc ligand and by two O atoms from two water molecules, forming a significantly distorted octahedral CdN O coordination geometry. In contrast, the other type of Cd ion (Cd2) is six-coordinated by two N atoms and two O atoms from two symmetry-related H Phbidc ligands and by two O atoms from two symmetry-related water molecules, leading to a more regular octahedral coordination geometry. The Cd1 and Cd2 ions are linked by H Phbidc ligands into a one-dimensional chain which runs parallel to the b axis. In the crystal, the one-dimensional chains are connected through hydrogen bonds, generating a two-dimensional layered structure parallel to the ab plane. Adjacent layers are further linked by hydrogen bonds, forming a three-dimensional structure in the solid state.