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The asymmetric unit of the title compound, [Fe(C(8)H(7)N(3))(3)](2)[SiMo(14)O(44)], consists of a complex [Fe(C(8)H(7)N(3))(3)](2+) cation and half of a derivative of an α-Keggin-type anion, [SiMo(14)O(44)](4-). In the mixed-valent Mo(V/VI) anion, the α-Keggin type core is capped on two oppositely disposed tetra-gonal faces by additional (MoO(2)) units. The [SiMo(14)O(44)](4-) anion shows disorder. Two O atoms of the central SiO(4) group ( symmetry) are equally disordered about an inversion centre. Moreover, two of the outer bridging O atoms and the O atoms of the capping (MoO(2)) unit are likewise disordered. The Fe(2+) cation is surrounded in a slightly distorted octa-hedral coordination by six N atoms from three 3-(2-pyrid-yl)-1H-pyrazole ligands. N-H⋯O hydrogen bonding between the cations and anions leads to a consolidation of the structure.

Bis{tris[3-(2-pyridyl)-1H-pyrazole]iron(II)} tetradecamolybdo(V,VI)silicate