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

The hydrothermally prepared title compound, [Cd(C8H7N3)3]2[PMo12O40]·6H2O, is isotypic with its MnII analogue [Hao et al. (2010). Acta Cryst. E66, m231–m232]. The CdII cation is in a distorted octahedral environment, coordinated by six N atoms from three chelating 3-(2-pyridyl)-1H-pyrazole ligands. In the reduced heteropolyanion, 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 contribute to the crystal packing. Compared with the MnII analogue, the Cd—N bond lengths are longer at 2.316 (7)–2.334 (6) Å, versus 2.224 (6)–2.283 (5) Å for Mn—N, whereas all other bond lengths and angles and the hydrogen-bonding motifs are very similar in the two structures.

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