catena-Poly[[[triaqua-copper(II)]-μ-2,2'-bipyridine-3,3'-dicarboxyl-ato-κN,N':O] monohydrate].

The title compound, {[Cu(C(12)H(6)N(2)O(4))(H(2)O)(3)]·H(2)O}(n), was synthesized under hydro-thermal conditions. The Cu(2+) ion is six-coordinated by three water O atoms, and two N atoms and one O atom of the 2,2'-bipyridine-3,3'-dicarboxyl-ate bridging ligand in a sligthly distorted octa-hedral environment. The 2,2-bipyridine-3,3'-dicarboxyl-ate bridges link the Cu(2+) ions into chains along the b-axis direction. These chains are further linked by O-H⋯O hydrogen bonds involving the water solvent mol-ecules, forming a three-dimensional framework.