Acta Crystallographica Section E

Structure Reports Online

Volume 63, Part 11 (November 2007)

inorganic compounds

Acta Cryst. (2007). E63, i191 [ doi:10.1107/S1600536807052506 ]

Rb₃[PMo₁₂O₄₀], a compound containing Keggin anions

P. Armand, D. Granier and A. van der Lee

Abstract: The cubic structure of trirubidium molybdophosphate, Rb₃[PMo₁₂O₄₀], contains [alpha] -type Keggin [PMo₁₂O₄₀]^3- anions and Rb⁺ counter-ions located in orthogonally intersecting channels. The P and Rb atoms are located on special positions with site symmetries $\overline{4}3$ m and $\overline{4}$ 2.m, respectively. The three-dimensional arrangement is isostructural with that found in, for example, X₃[PMo₁₂O₄₀], with X = K, NH₄ and H₃O, or X₃[PW₁₂O₄₀] and X₄[SiW₁₂O₄₀], with X = Ag and Tl. The compound was crystallized using a typical high-temperature solid-state reaction with GaPO₄ and X₃Mo₃O₁₀ (X = Rb or Li) as starting materials.

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