Syntheses and crystal structures of two Cd(II) coordination polymers: one-dimensional chain [Cd(C_4H_6N_2)_2(C_4H_2O_4)(H_2O)_2]_n and two-dimensional sheet [Cd(C_4H_6N_2)(H_2O)(C_4H_4O_4)]_n centre dot nH_2O

摘要

Two new Cd(II) coordination polymers, [Cd(C_4H_6N_2)_2(C_4H_2O_4)(H_2O)_2]_n (1) (where C_4H_6N_2 = 2-methylimidazole, C_4H_2O_4 = fumarate), and [Cd(C_4H_6N_2)(H_2O)(C_4H_4O_4)]_n centre dot nH_2O (2), (where C_4H_4O_4 = succinates), have been prepared and structurally characterized by single crystal X-ray diffraction. Complex 1 crystallizes in the triclinic space group Pi in a one-dimensional chain structure, in which carboxy is monodentate; a three-dimensional supermolecular network structure was formed through hydrogen bonding. In complex 2, the coordination geometry of the Cd atoms is a pentagonal bipyramid, and a two-dimensional sheet is formed though carboxyl group bridging. In 1 and 2, IR spectra indicate the presence of bridging carboxyl groups, confirmed by structure analyses.