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Acta Cryst. (2009). E65, i2 [ doi:10.1107/S1600536808043171 ]
Abstract: In contrast to the previous refinement from photographic data [Ferrari et al. (1955). Gazz. Chim. Ital. 84, 169-174], the present redetermination of the title compound, caesium hexaaquamagnesium arsenate(V), revealed the Cs atom to be on Wyckoff position 4d instead of Wyckoff position 4b of space group F
3m. The structure can be derived from the halite structure. The centres of the complex [Mg(OH2)6] octahedra and the AsO4 tetrahedra (both with 3m symmetry) are on the respective Na and Cl positions. The building units are connected to each other by O-H
O hydrogen bonds. The Cs+ cations (3m symmetry) are located in the voids of this arrangement and exhibit a regular cuboctahedral 12-coordination to the O atoms of the water molecules. The O atom bonded to As has 2mm site symmetry (Wyckoff position 24f) and the water-molecule O atom has m site symmetry (Wyckoff position 48h).
Online 20 December 2008
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