M. Grottel et al., H-1 AND F-19 NMR-STUDY OF CATION AND ANION MOTIONS IN GUANIDINIUM FLUOROANTIMONATES, Zeitschrift fur Naturforschung. A, A journal of physical sciences, 50(8), 1995, pp. 742-748
Proton and fluorine NMR linewidths, second moments, and spin-lattice r
elaxation times of polycrystalline [C(NH2)(3)]2SbF5 and C(NH2)(3)SbF6
were studied in a wide temperature range. For the pentafluoroantimonat
e, C-3-reorientation guanidinium cation and C-4-reorientation of the S
bF5 anion were revealed and their activation parameters determined. Th
e dynamical inequivalence of the two guanidinium cations was evidenced
. For the hexafluoroantimonate, two solid-solid phase transitions were
found. In the low temperature phase the guanidinium cation undergoes
C-3 reorientation while the SbF6 anion reorients isotropically. The re
spective activation parameters were derived. Ar high temperatures new
ionic plastic phases were evidenced.