Poly[aqua(μ2-4,4′-bipyridyl-κ2 N: N′)(μ2-3-phosphonatobenzenesulfonato-κ2 O: O′)copper(II)].

The title polymer, [Cu(C6H5O6PS)(C10H8N2)(H2O)] n, was synthesized by a hydrothermal method. The CuII ion is five-coordinated by one phosphonate O atom, one sulfonate O atom, two N atoms of the bipyridyl ligand and one water molecule. The coordination geometry around the metal centre can be described as slightly distorted square-pyramidal. The CuII ions are connected by bidentate bridging phosphonato-benzenesulfonate ligands, forming one-dimensional helical chains along [010], which are further bridged by bidentate 4,4′-bipyridyl ligands, generating a two-dimensional layered crystal structure. The layered structure features an eight-membered ring including four CuII ions, two [O3S–C6H4–PO3H]2− anions and two 4,4′-bipyridyl ligands. Hydrogen bonds involving aqua ligands, phosphonate O and sulfonate O atoms are observed between the layers, [ABSTRACT FROM AUTHOR]