μ-Oxalato-κ(4) O (1),O (2):O (1′),O (2′)-bis­[diaqua­(2,2′-bipyridyl-κ(2) N,N′)zinc] bis­[2-(1H-benzotriazol-1-yl)acetate] hexa­hydrate

The asymmetric unit of the title compound, [Zn(2)(C(2)O(4))(C(10)H(8)N(2))(2)(H(2)O)(4)](C(8)H(6)N(3)O(2))(2)·6H(2)O, contains one half of the centrosymmetric binuclear cation, one anion and three water mol­ecules. In the cation, the oxalate ligand bridges two Zn(II) ions in a bis-bidentate fashion, so each Zn(II) ion is coordinated by two O atoms from the oxalate ligand, two N atoms from two 2,2′-bipyridine ligands and two water mol­ecules in a distorted octa­hedral arrangement. The mean planes of the oxalate and 2,2′-bipyridine ligands form a dihedral angle of 80.0 (1)°. An extensive three-dimensional hydrogen-bonding network formed by classical O—H⋯O and O—H⋯N inter­actions consolidates the crystal packing.