Bis[triaqua­(1H-1,2,4-triazole-3,5-dicarboxyl­ato-κ(2) O (3),N (4))copper(II)] di-μ-aqua-bis­[diaqua­(1H-1,2,4-triazole-3,5-dicarboxyl­ato-κ(2) O (3),N (4))copper(II)]

In the title compound, [Cu(C(4)HN(3)O(4))(H(2)O)(3)](2)[Cu(2)(C(4)HN(3)O(4))(2)(H(2)O)(6)], both monomeric and dimeric mol­ecules are present in the solid state. In the monomeric compound, the Cu(II) atom is five-coordinated in a square-pyramidal configuration by one O atom and one N atom from one 1H-1,2,4-triazole-3,5-dicarboxyl­ate (TZDCA(2−)) ligand and three O atoms from water mol­ecules. In the centrosymmetric binuclear complex, each Cu(II) atom is six-coordinated in an octa­hedral geometry by one O atom and one N atom from one TZDCA(2−) ligand and four O atoms from water mol­ecules, two of which bridge the Cu(II) atoms. In the structure, there are intra­molecular O—H⋯O and N—H⋯O hydrogen bonds, and in the crystal, inter­molecular O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds link symmetry-related mol­ecules, forming a three-dimensional supra­molecular structure.