Acta Cryst. (2008). E64, i50  [ doi:10.1107/S1600536808023283 ]

Redetermination of the hexagonal struvite analogue Cs[Mg(OH₂)₆](PO₄)

M. Weil

Abstract: The structure of the hexagonal modification of caesium hexaaquamagnesium phosphate has been redetermined from single-crystal X-ray data. The previous refinement from photographic data [Ferrari, Calvaca & Nardelli (1955). Gazz. Chim. Ital. 85, 1232-1238] was basically confirmed, but with all H atoms located and with all non H-atoms refined with anisotropic displacement parameters. The structure can be derived from the NiAs structure type: the PO₄ tetrahedra (3m. symmetry) are on the Ni positions and the complex [Mg(OH₂)₆] octahedra (3m. symmetry) are on the As positions. The building units are connected to each other by hydrogen bonds. The Cs⁺ cations (3m. symmetry) are located in the voids of this arrangement and exhibit a distorted cuboctahedral 12-coordination by the O atoms of the water molecules.

Online 31 July 2008

Copyright © International Union of Crystallography
IUCr Webmaster