Dibromido[1,1′-dibutyl-2,2′-(pentane-1,1-diyl)di-1H-benzimidazole]copper(II)

Abstract

In the title compound, [CuBr2(C27H36N4)], the CuII ion exhibits a distorted tetrahedral coordination geometry provided by two bromide ions and by chelation of two imine N-atom donors from a bis(benzimidazole) ligand. Chelation results in a six-membered boat-shaped ring which links the benzimidazole groups. Each bis(benzimidazole) fragment contains three n-butyl substituents, two of which have the expected trans conformation; the third exhibits the higher-energy cis conformation, an orientation consistent with several short intramolecular C—H...Br interactions. Essentially planar (r.m.s. deviations of 0.0101 and 0.0183 Å) benzimidazole groups are oriented so as to give the bis(benzimidazole) fragment a V-shaped appearance in profile with the cis and trans n-butyl groups directed to opposite sides of the planes. In the crystal, columns of molecules along the b-axis direction form layers parallel to the (202) planes. Within a given column, the molecules are linked by C—H...Br hydrogen bonds. The molecules in adjacent columns are also linked by intermolecular C—H...π interactions, forming a three-dimensional network.