catena-Poly[[(benzoato-κ2O,O′)chloridocadmium(II)]-μ-2,2′-diphenyl-1,1′-(butane-1,4-diyl)diimidazole-κ2N3:N3′]

The title Cd-II coordination polymer, [Cd(C7H5O2)Cl(C22H22N4)](n), was obtained by reaction of CdCl2 center dot 2.5H(2)O, benzoic acid (HL) and 2,2'-diphenyl-1,1'-(butane-1,4- diyl) diimidazole (bbip). Each Cd-II cation is five-coordinated by a ClO2N2 donor set in a distorted trigonal-bipyramidal geometry. In the bbip ligand, three C atoms and one N atom are disordered equally over two positions; another two C atoms are disordered over two positions, the site-occupancy ratio being 0.6:0.4. The bbip ligand acts as a bridging bidentate ligand, linking Cd-II centres into a one-dimensional zigzag chain; adjacent chains are further connected through face-to-face pi-pi interactions between the imidazole rings [with an average face-to-face distance of 3.560 (8) angstrom], resulting in the formation of a two-dimensional supramolecular layer.