Received 29 November 2010
The title compound, [Al(H2O)6][Cr(OH)6Mo6O18]·10H2O, hexaaquaaluminium hexahydroxidooctadecaoxidomolybdochromate(III) decahydrate, crystallizes isotypically with its gallium analogue [Ga(H2O)6][Cr(OH)6Mo6O18].10H2O. In the structure of the title compound, both the [Al(H2O)6]3+ cation and the Anderson-type [Cr(OH)6Mo6O18]3- anion lie on centres of inversion. The anion is composed of seven edge-sharing octahedra, six of which are MoO6 octahedra that are arranged hexagonally around the central Cr(OH)6 octahedron. The anions are linked to each other by O-HO hydrogen bonds into infinite chains along . These chains are further connected with the [Al(H2O)6]3+ cations through O-HO hydrogen bonds into sheets parallel to (01). O-HO hydrogen bonds involving all the lattice water molecules finally link the sheets into a three-dimensional network.
Data collection: RAPID-AUTO (Rigaku, 1998); cell refinement: RAPID-AUTO; data reduction: CrystalStructure (Rigaku/MSC, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: WM2434 ).
This work was supported financially by the National Basic Research Program of China (2007CB808003) and the National Natural Science Foundation of China (20973082, 20921003, 20703019).
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