Bis{tris­[3-(2-pyrid­yl)-1H-pyrazole]zinc(II)} dodeca­molybdosilicate hexa­hydrate

The asymmetric unit of the title compound, [Zn(C(8)H(7)N(3))(3)](2)[SiMo(12)O(40)]·6H(2)O, consists of a complex [Zn(C(8)H(7)N(3))(3)](2+) cation, half of a Keggin-type [SiMo(12)O(40)](4−) heteropolyanion and three uncoordinated water mol­ecules. The Zn(2+) cation is surrounded in a distorted octa­hedral coordination by six N atoms from three chelating 3-(2-pyrid­yl)pyrazole ligands. In the heteropolyanion, two O atoms of the central SiO(4) group ([Image: see text] symmetry) are equally disordered about an inversion centre. N—H⋯O hydrogen bonding between the cations, anions and the uncoordinated water mol­ecules leads to a consolidation of the structure.