Bis(μ-2-carb-oxy-5-nitro-benzoato-κO:O)bis-[(2,2'-bipyridine-κN:N')chloridocopper(II)] dihydrate.

The asymmetric unit of the title complex, [Cu(2)(C(8)H(4)NO(6))(2)Cl(2)(C(10)H(8)N(2))(2)]·2H(2)O, contains two half binuclear complex molecules and two solvent water molecules; the complete complex molecule is generated by the application of a centre of inversion in each case. Each independent Cu(II) cation is penta-coordinated within a distorted square-pyramidal environment defined by a two μ(2)-O atoms (derived from two 2-carboxy-5-nitrobenzoato anions), two N atoms (bipyridine ligand) and one Cl. Binuclear species are assembled into a two-dimensional supramolecular architecture parallel to (01[Formula: see text]) by O-H⋯O and O-H⋯Cl hydrogen bonds.