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

Abstract

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 ( 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.

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

“…For the isotypic Mn 2+ and Cd 2+ structures, see: Hao, Ma et al (2010); Hao, Wang et al (2010). For general background to polyoxometalates, see: Pope & Mü ller (1991).…”

“…The crystal structure of [(Fe(C 8 (Hao, Ma et al, 2010) and [(Cd(C 8 (Hao, Wang et al, 2010). In comparison with the Mn 2+ and Cd 2+ analogues, the Fe-N bond lengths (2.085 (19)-2.15 (2) Å) are somewhat shorter than the Mn-N and Cd-N bond lengths with 2.224 (6)-2.283 (5) Å and 2.316 (7)-2.334 (6) Å, respectively.…”