Synthesis and physicochemical investigation of LiMTif6

Mixed alkali hexafluorotitanates of the composition LiMTiF₆ are synthesized, which crystallize with the orthorhombic symmetry. The lattice parameters of these materials are determined. It is shown that substitution of the Li⁺ cation in Li₂TiF₆ by Na⁺, K⁺, Rb⁺, and Cs⁺ leads to various degrees of distortion of the hexafluoroion. It is determined (¹⁹F NMR data) that the change in the dynamic state of the octahedral TiF₆]^2– ions is related to their transition from the hindered-rotational to the isotropic state.Institute of Chemistry, Far-Eastern Branch, Russian Academy of Sciences, 690022 Vladivostok. Translated fromIzvestiya Akademii Nauk, Seriya Khimicheskaya, No. 11, pp. 2483–2490, November, 1992.