In the polymeric title compound, [CuCl2(C6H6N4)](n), each Cu-II ion is five-coordinated by four basal atoms (two N atoms from a 2,2'-biimidazole molecule and two Cl. anions) and one axial Cl- anion, in a distorted square-pyramidal coordination geometry. Cl. anions bridge the {Cu(C6H6N4) Cl} units into one-dimensional linear chains, which are reinforced by pi-pi interactions. Adjacent linear chains are linked by N-H center dot center dot center dot Cl hydrogen bonds, resulting in a grid layer. The hydrogenbonding pattern can be described in graph-set notation as C-2(2)(9)R-2(2)(9)R-2(2)(14). This study extends our knowledge of the multifunctional properties of the 2,2'-biimidazole ligand and of the coordination stereochemistry of copper(II).
Copper(II) complexes with 2,2′-biimidazole. Preparation and crystal structure determination of a complex of stoichiometry Cu1.5Cl3(H2bim)2 (H2bim=2,2′-biimidazole)