(IUCr) Crystallography Journals Online

Acta Cryst. (2009). E65, i87 [ doi:10.1107/S1600536809046297 ]

Tricaesium dimolybdate(VI) bromide

A. S. Pakhomova and S. V. Krivovichev

Abstract: The title compound, Cs₃(Mo₂O₇)Br, was synthesized by the reaction of CsNO₃, MoO₃ and 1-ethyl-3-methylimidazolium bromide. Its crystal structure is isotypic with K₃(Mo₂O₇)Br and contains (MoO₄)^2- tetrahedra which share an O atom to produce a [Mo₂O₇]^2- dimolybdate(VI) anion with a linear bridging angle and $\overline{6}$ m2 symmetry. The anions are linked by Cs atoms (site symmetry $\overline{6}$ m2), forming sheets parallel to (001). Br atoms (site symmetry $\overline{6}$ m2) are also part of this layer. Another type of Cs atom (3m site symmetry) is located in the interlayer space and connects the layers via Cs-O and Cs-Br interactions into a three-dimensional array.

Online 7 November 2009