Tris{aqua­bis[3-(2-pyrid­yl)-1 H-pyrazole]copper(II)} di-μ ₉-arsenato-hexa­triaconta-μ ₂-oxido-octa­deca­oxidoocta­deca­molybdate(VI)

Abstract

The title compound, [Cu(C ₈H ₇N ₃) ₂(H ₂O)] ₃[As ₂Mo ₁₈O ₆₂], consists of two subunits, viz. an α-Dawson-type [As ₂Mo ₁₈O ₆₂] ⁶⁻ anion and a complex [Cu(C ₈H ₇N ₃) ₂(H ₂O)] ²⁺ cation. The copper(II) ion (site symmetry .2) is penta­coordinated in a distorted square-pyramidal manner by four N atoms from two chelating 3-(2-pyrid­yl)pyrazole ligands in equatorial positions and one water mol­ecule in the apical position. In the heteropolyanion, two O atoms of the AsO ₄ group (3. symmetry) are equally disordered about the threefold rotation axis. N—H⋯O and O—H⋯O hydrogen bonding between the neutral mol­ecules and the water mol­ecules leads to a consolidation of the structure.