Received 22 January 2010
aLaboratoire de Chimie des Matériaux et de l'Environnement, FSTG-Marrakech, Morocco,bEquipe Sciences des Matériaux, Faculté des Sciences et Techniques, Errachidia, Morocco,cDepartment of Earth-Geology, Uppsala University, Sweden, and dLaboratoire de Chimie du Solide Appliquée, Faculté des Sciences, Université Mohammed V-Agdal, Avenue Ibn Battouta, BP 1014, Rabat, Morocco
Correspondence e-mail: email@example.com
The title compound, (NH4)5Na7[Mo5P2O23]2·21H2O, was prepared under atmospheric conditions in aqueous solution at room temperature. The structure contains the [Mo5P2O23]6- heteropolyoxometallate anion, which has been previously reported a number of times with a variety of differing counter-cations. Each anion is built up of five MoO6 octahedra sharing an edge and forming a ring which is closed by common corners of the terminal octahedra. The rings are closed on both sides by two asymmetric PO4 tetrahedra, sharing three corners with three MoO6 octahedra. The anions are chiral and the two independent anions in the asymmetric unit were arbitarily chosen with the same chirality, but the centrosymmetric crystal contains both enantiomers. The structure can alternatively be described as a succession of layers parallel to (101), formed by the [Mo5P2O23]6- anions and linked by sodium chains. Water molecules and ammonium ions fill the remaining space and ensure the cohesion through extensive N-HO and O-HO hydrogen bonding.
For ammonium polyoxomolybophosphates, see: Boeyens et al. (1976); Ferrari & Nanni (1939); Ilhan et al. (2007); Andersen & Villadsen (1993); Xu et al.(1998). For background to the heteropolyoxometallate anion, see: Hedman & Strandberg (1979); Long et al. (2007); Pope (1983); Strandberg (1973). For examples of hybrid compounds see: Ma et al. (2006); Wu et al. (2009).
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 PLATON (Spek, 2009); software used to prepare material for publication: WinGX publication routines (Farrugia, 1999).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: FJ2276 ).
The authors thank the Unit of Support for Technical and Scientific Research (UATRS, CNRST) for making the present work possible. They also thank H. Zouihri for his helpful technical assistance during the X-ray measurements. The authors are also grateful to the Swedish Research Council and the Swedish International Development Co-operation Agency (Sida) for the financial grant (MENA) offered in support of this work.
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