Poly[[aqua-(μ-4,4'-bipyridine-κN:N')(μ(3)-2-nitro-5-sulfonatobenzoato-κO:O:O)copper(II)] 4,4'-bipyridine hemisolvate].

In the title compound, [Cu(C(7)H(3)NO(7)S)(C(10)H(8)N(2))(H(2)O)]·0.5C(10)H(8)N(2), the Cu(II) atom is six-coordinated by two N atoms from two different bipyridine (bipy) ligands, one sulfonate O atom and two carboxyl-ate O atoms from three 2-nitro-5-sulfonatobenzoate ligands and one water O atom in a distorted octa-hedral geometry. The bipy solvent mol-ecule lies on an inversion center. The Cu(II) atoms are linked by the bipy ligands, forming one-dimensional chains, which are connected by the 2-nitro-5-sulfonatobenzoate ligands into a two-dimensional layer-like network. The two-dimensional structure is extended by O-H⋯O and O-H⋯N hydrogen bonds into a three-dimensional supra-molecular network.