Crystal structure of hexakis(N,N-dimethylacetamide)ytterbium(III) dodecawolframophosphate [Yb(DMAA)6]PW12O40

An X-ray diffraction study of the [Yb(DMAA)6]PW12O40 complex (DMAA is N,N-dimethylacetamide) is performed. The structure contains isolated cationic complexes [Yb(DMAA)6]3+ and heteropolyanions PW12O3-40. The cationic complexes and the heteropolyanions occupy centrosymmetric positions. The coordination polyhedron of the Yb atom is a slightly distorted octahedron. Unlike the Nd complex of the same composition, which was studied earlier, O atoms of the heteropolyanion are not included in the Yb coordination. All the O atoms of the heteropolyanion are disordered. Analysis of the disordering reveals that the heteropolyanion has a Keggin structure (α isomer), and its disordering results from the centrosymmetric position