Non-centrosymmetric Rb2Mn2(MoO4)3

Abstract

The title compound, dirubidium dimanganese(II) tris(tetraoxomolybdate), Rb2Mn2(MoO4)3, was prepared by solid-state reactions. The structure can be described as being composed of MnO6octahedra sharing corners with MoO4tetrahedra. The three-dimensional framework contains cavities in which the rubidium ions are located. The Rb+cations are within distorted nine- and 12-vertex polyhedra. The pairs of different Mn2+and Rb+cations are each located on threefold rotation axes.. Rb2Mn2(MoO4)3is isotypic with compounds of the Cs2M2Mo3O12(M= Ni, Fe) family. A comparative structural description is provided between the structure of the title compound and those of related phases. Differences with structures such as alluaudite are discussed.