Redetermination of the cubic struvite analogue Cs[Mg(OH2)6](AsO4)

Redetermination of the cubic struvite analogue Cs[Mg(OH2)6](AsO4)

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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 Foverline{4}3m.The structure can be derived from the halite structure.The centres of the complex [Mg(OH2)6] octahedra and here the AsO4 tetrahedra (both with overline{4}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 (overline{4}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 baseball scoreboards for sale the water-molecule O atom has m site symmetry (Wyckoff position 48h).