Synthesis and structure of one-dimensional cadmium coordination polymer [Cd(μ-DPIA)2(H2O)]n

A novel one-dimensional coordination polymer, [Cd(mu-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 Pca2, with unit cell parameters: a= 1.509 6(3) nm, b =0.61 1 1 (1) nm, c = 3.2164(6) nm, and V=2.967 1(10) nm(3), Z=4, R=0.032 7, wR=0.086 7. The Cd atom is seven-coordinated by four 0 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 (CdCd)-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.