H-1 AND F-19 NMR-STUDY OF ION DYNAMICS IN TRIS-GUANIDINIUM HEPTAFLUOROZIRCONATE [C(NH2)(3)](3)ZRF7

Proton and fluorine NMR spectra and spin-lattice relaxation times were measured for polycrystal line tris-guanidinium heptafluorozirconate i n a wide temperature range. In-plane C-3 reorientation of the guanidin ium cation hindered by the energy barrier E-a = 48.4 kJ/mol and isotro pic reorientation of the fluoro-anion with the activation energy E-a = 38.8 kJ/mol have been revealed. At 467 K a solid-solid and at 541 K a solid-liquid phase transition have been discovered.