A novel one-dimensional coordination polymer, [Cd(μ-DPIA)2(H2O)]n (HDPIA=4,5-Diphenylimidazole-1-acetic acid), was synthesized and characterized by the element analysis, IR and single crystal X-ray diffraction. It crystallizes in the orthogonal space group Pca21 with unit cell parameters: a=1.5096(3) nm, b=0.611 1(1) nm, c=3.2164(6) nm, and V=2.9671(10) nm3, Z=4, R=0.0327, wR=0.0867. The Cd atom is seven-coordinated by four O atoms and two N atoms from two chelating DPIA- ligands and one water molecule, and displays a distorted pentagonal bipyramid coordination geometry. Each DPIA- ligand bridges two adjacent Cd atoms, forming a infinite chain along the a axis direction. The Cd…Cd separation within the polymer is 0.765 0(3) nm. A layer structure which parallels to the ab plane is further constructed by hydrogen bonding interactions. CCDC: 254247.
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