inorganic compounds
The title compound, (CsCl)Cs2(TeV2O7)2, was obtained at 700 K during the crystallization of a mixed tellurium-caesium vanadate using tellurium tetrachloride as a transport agent. The structure consists of stacks of [V2TeO7] sheets alternately separated by layers of caesium atoms and layers of caesium and chlorine atoms. Within the sheets, the V atoms are distributed over two sites: a tetrahedral site containing V5+ ions and a square pyramidal site containing V4+ ions. The Te4+ ion lies within a tetrahedron formed by three O atoms and a lone pair. A maximum in the electron density is observed at the expected position of the lone pair.