Synthesis, crystal structure and thermal analysis of supramolecular architectures of copper(II)(2,2′-biimidazole) complexes using dicarboxylate as a coligand

Abstract

Two new copper(II) complexes {[Cu(H 2biim)(H 2O)(suc)](H 2O)} n ( 1) and {[Cu(H 2biim) 2(H 2O)][Cu(H 2biim) 2(glut)](glutH)(NO 3) · 2.5H 2O} n ( 2) (H 2biim, 2,2′-biimidazole; suc, succinate dianion; glut, glutarate dianion) have been synthesized and characterized by single crystal X-ray diffraction study and thermal analysis. Complex 1 comprises of 1D zigzag coordination polymers, elongated along the crystallographic b-axis, connected through H-bonding and face-to-face π–π interactions to form a robust 3D network. Whereas complex 2 is built up of bischelated [Cu(II)(H 2biim) 2] 2+ units, glutarate and nitrate anions and water molecules, held together through an extensive H-bonded system. The resulting 3D supramolecular architecture defines channels which are filled by lattice water molecules and disordered nitrate anions.