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

Crystals of the title compound, [Fe(C8H7N3)3]2[PMo12O40]·6H2O, prepared under hydrothermal conditions, are isotypic with the Mn2+ and Cd2+ analogues. The Fe2+ cation is in a distorted octahedral coordination by six N atoms from three chelating 3-(2-pyridyl)-1H-pyrazole ligands. The heteropolyanion [PMo12O40]4− is a one-electron reduced species in which two O atoms of the central PO4 group (overline{1} symmetry) are equally disordered about an inversion centre. N—H...O and O—H...O hydrogen bonds make a contribution to the crystal packing. The Fe—N bond lengths [2.085 (19)—2.15 (2) Å] are somewhat shorter than the Mn—N and Cd—N bond lengths [2.224 (6)–2.283 (5) and 2.316 (7)–2.334 (6) Å, respectively]. All other bond lengths and angles and the hydrogen-bonding motifs are very similar in the isotypic structures.

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