Received 29 November 2010
The title compound, AgMg3(PO4)(HPO4)2, which has been synthesized by the hydrothermal method, has an alluaudite-like structure which is formed by edge-sharing MgO6 octahedra (one of which has symmetry 2), resulting in chains linked together by phosphate groups and hydrogen bonds. The three-dimensional framework leads to two different channels along the c axis, one of which is occupied by Ag+ ions with a square-planar coordination. The Ag+ ions are disordered over two sites in a 0.89 (3):0.11 (3) ratio. The OH groups, which point into the other type of channel, are involved in strong O-HO hydrogen bonds. The title compound is isotypic with the compounds AM3H2(XO4)(HXO4)2 (A = Na or Ag, M = Mn, Co or Ni, and X = P or As) of the alluaudite structure type.
For applications of related compounds, see: Kacimi et al. (2005); Korzenski et al. (1998); Trad et al. (2010). For compounds with the same structure type, see: Moore (1971); Hatert (2008); Hatert et al. (2000); Assani et al. (2010); Guesmi & Driss (2002); Ben Smail & Jouini (2002); Stock & Bein (2003); Leroux et al. (1995).
Data collection: APEX2 (Bruker, 2005); cell refinement: SAINT (Bruker, 2005); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: WinGX (Farrugia, 1999).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: FJ2371 ).
The authors thank the Unit of Support for Technical and Scientific Research (UATRS, CNRST) for the X-ray measurements.
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