Bis(2-aminoethyl-1H-benzimidazole-κN3)-chlorocopper(II) perchlorate

The title compound, [CuCl(C9H11N3)]ClO4, was prepared by reaction of 2-aminoethylbenzimidazole dihydrochloride with copper(II) perchlorate. The crystal structure is built of bis(2-aminoethylbenzimidazole)chlorocopper(II) cations and perchlorate anions. Both cation and anion occupy special positions on a twofold axis. Each of the aminoethylbenzimidazole ligands coordinates the Cu atom through one cyclic imine and one exocyclic amine group. The chloro ligand occupies the fifth coordination site in the Cu-atom environment, thus forming a trigonal bipyramid, with the Cl atom and amine N atoms in the equatorial and both cyclic imine atoms in the axial positions [the N-Cu-N angle formed by the axial bonds is 179.61 (10)degrees]. N-H...Cl and N-H...O hydrogen-bonding interactions link cations and anions into layers normal to the b axis.