Crystal structure of rubidium and cesium tetrafluoroindate(III) dihydrates

Abstract

The crystal structures of isostructural fluoride complexes of indium(III) M[InF₄(H₂O)₂] (M = Rb, Cs) crystallizing in the monoclinic system, space group I2/a, are studied. The structures of M[InF₄(H₂O)₂] (M = Rb, Cs) are formed of isolated centrosymmetric complex [InF₄(H₂O)₂]^– anions with the trans-position of coordinated H₂O molecules and Rb⁺, respectively Cs⁺, cations. The In atom in the complex [InF₄(H₂O)₂]^– anion is surrounded by four F atoms and two oxygen atoms of coordinated H₂O molecules, forming the coordination polyhedron as a slightly distorted octahedron. Via a system of hydrogen O–H⋯F bonds the polyhedra of In atoms are arranged in a three-dimensional framework with the cations located in its channels.