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The asymmetric unit of the polymeric title compound, [Ni(C8H4O4)(C10H14N4)(H2O)] n , contains one Ni(2+) cation, one coordinating water mol-ecule, one 3,3',5,5'-tetra-methyl-4,4'-bi-pyrazole ligand and half each of two benzene-1,4-di-carboxyl-ate anions, the other halves being generated by inversion symmetry. The Ni(2+) cation exhibits an octa-hedral N2O4 coordination sphere defined by the O atoms of the water mol-ecule and two different anions and the N atoms of two symmetry-related N-heterocycles. The N-heterocycles and both anions bridge adjacent Ni(2+) cations into a three-dimensional network structure, with one of the anions in a bis-bidentate and the other in a bis-monodentate bridging mode. N-H⋯O and O-H⋯O hydrogen bonds between the N-heterocycles and water mol-ecules as donor groups and the carboxyl-ate O atoms as acceptor groups consolidate the crystal packing.

acta crystallographica. section e, crystallographic communications

Crystal structure of poly[diaqua(μ2-benzene-1,4-dicarboxylato-κ2O1:O4)(μ2-benzene-1,4-dicarboxylato-κ4O1,O1′:O4,O4′)bis(μ2-3,3′,5,5′-tetramethyl-4,4′-bipyrazole-κ2N:N′)dinickel(II)]