| Summary: | In the title compound, [Cu(C4HN3O4)(H2O)3]2[Cu2(C4HN3O4)2(H2O)6], both monomeric and dimeric molecules are present in the solid state. In the monomeric compound, the CuII 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 (TZDCA2−) ligand and three O atoms from water molecules. In the centrosymmetric binuclear complex, each CuII atom is six-coordinated in an octahedral geometry by one O atom and one N atom from one TZDCA2− ligand and four O atoms from water molecules, two of which bridge the CuII 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.
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