One-dimensional coordination polymers of Co(II) and Cd(II)-squarate with 2-methylimidazole and 4(5)-methylimidazole ligands

Abstract

Two new mixed-ligand coordination polymers, {[Co(mu(1,3)-sq)(H2O)(2)(2-Meim)(2)] 2(2-Meim)}(n) (1) and [Cd(mu(1) (3)-sq)(H2O)(2)(4(5)-Meim)(2)](n) (2), (sq = squarate, 2-Meim = 2-methylimidazole, 4(5)-Meim = 5-methylimidazole) have been synthesized and structurally characterized by X-ray crystallography. The spectral (IR arid UV-Vis) and thermal analyses are also reported The Co(II) and Cd(II) ions are distorted octahedrally coordinated by four oxygen atoms of two O-1-O-3-bridging squarate ligands arid two trans-aqua ligands, and by two nitrogen atoms of the trans-imidazole (2-Meim or 4(5)-Meim) ligands The structures of 1 and 2 consist of one-dimensional chains of mu-1,3-squarato bridged metal(II) complex units These chains are held together by hydrogen bonding interactions, forming three-dimensional framework (C) 2009 Elsevier Ltd All rights reserved