title: Octa-aqua-bis(μ(2)-1H-pyrazole-3,5-di-carboxyl-ato)tricopper(II) tetra-hydrate.
abstract: In the trinucler Cu(II) complex mol-ecule of the title compound, [Cu(3)(C(5)HN(2)O(4))(2)(H(2)O)(8)]·4H(2)O, the central Cu(II) atom is located on an inversion centre and is coordinated in a distorted octa-hedral geometry. The equatorial sites are occupied by two N and two O atoms from two pyrazole-3,5-dicarboxyl-ate ligands and the axial positions are occupied by two water mol-ecules. The two other symmetry-related Cu(II) atoms are penta-coordinated and assume a square-pyramidal geometry. In the crystal structure, coordinated and uncoordinated water mol-ecules and carboxyl-ate O atoms are linked by O-H⋯O hydrogen bonds.
authors.forename: Zhi-Gang
authors.initials: ZG
authors.lastname: Li
authors.forename: Shao-Ai
authors.initials: SA
authors.lastname: Li
authors.forename: De-Quan
authors.initials: DQ
authors.lastname: Liu
authors.forename: Yi-Hua
authors.initials: YH
authors.lastname: Huang
authors.forename: Jing-Wei
authors.initials: JW
authors.lastname: Xu