Tricaesium dimolybdate(VI) bromide

The title compound, Cs(3)(Mo(2)O(7))Br, was synthesized by the reaction of CsNO(3), MoO(3) and 1-ethyl-3-methyl­imidazolium bromide. Its crystal structure is isotypic with K(3)(Mo(2)O(7))Br and contains (MoO(4))(2−) tetra­hedra which share an O atom to produce a [Mo(2)O(7)](2−) dimolybdate(VI) anion with a linear bridging angle and [Image: see text] m2 symmetry. The anions are linked by Cs atoms (site symmetry [Image: see text] m2), forming sheets parallel to (001). Br atoms (site symmetry [Image: see text] 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.