| Summary: | The asymmetric unit of the title compound, [Ni(C8H7N3)3]2[SiMo12O40]·4H2O, consists of a complex [Ni(C8H7N3)3]2+ cation, half of a Keggin-type heteropolyanion [SiMo12O40]4− and two uncoordinated water molecules. The Ni2+ cation is surrounded in a slightly distorted octahedral coordination by six N atoms from three chelating 3-(2-pyridyl)-1H-pyrazole ligands. In the heteropolyanion, two O atoms of the central SiO4 group (overline{1} symmetry) are equally disordered about an inversion centre. N—H...O and O—H...O hydrogen bonding between the cations, anions and the uncoordinated water molecules leads to a consolidation of the structure.
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