Syntheses and Crystal Structures of Two Chloro-Bridged Coordination Polymers [Cd(BIM)Cl_2]_n and [Pb(BIM)Cl_2] _n

摘要

Two novel coordination polymers, [Cd(BIM)Cl_2]_n (1) and [Pb(BIM)Cl_2]_n (2) [wherein BIM=bis(imidazol-1-yl) methane], were synthesized by the reactions of the BIM ligand with CdCl _2 and PbCl_2, respectively. They were characterized by elemental analyses, IR, TGA and X-ray single-crystal diffraction techniques. Single-crystal X-ray structure analyses showed there is a pseudooctahedral arrangement around the cadmium atom in the complex 1. It has a three-dimensional network which contains one-dimensional inorganic-organic hybrid chains and μ_2-bridging chloride ligands. A rare pentacoordinate square-pyramidal arrangement was adopted for the lead(II) atom in the complex 2, which has an unusual two-dimensional layer structure of macrometallacycles crosslinked with the bridging Pb_2Cl_2 units. The metal atoms in both complexes were coordinated with two BIM ligands in cis arrangement and bridged by μ_2-bridging chloride ligands.