Crystal structures of LiCsTiF6 and Cs2TiF6 and internal mobility of complex anions

Single crystals of LiCsTiF6 (1) and Cs2TiF6 (II) are characterized by X-ray diffraction analysis (DAR-UMBk and SMART 1000 CCD diffractometers, MoKalpha radiation, graphite monochromator; anisotropic least squares refinement to R = 0.038 and R-w = 0.046 (I) and R-1 = 0.017 and wR(2) = 0.046 (II)). Packing modes of structural units in the crystals are considered. Types of internal motions of complex TiFb(6)(2-) ions are established, and their activation energies in the crystals of LiCsTiF6 and Cs2TiF6 are estimated in the temperature range 200-500 K.