catena-Poly[aqua(benzimidazole-N3)copper(II)-μ-malonato-O,O'':O']

The title compound forms a polymeric chain, [Cu(C 3 H 2 O 4 )(C 7 H 6 N 2 )(H 2 O)]∞. A malonate ion adopts a bridging position between two Cu atoms, coordinating via three of its O atoms. Two form a six-membered chelate ring, the third coordinates to the neighbouring Cu atom. The square-pyramidal Cu II coordination comprises one N and three O atoms as the base, and an H 2 O molecule in the apical position. The equalization of C-O bonds of both carboxylate groups and a differentiation of Cu-O bond lengths is observed.