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The temperature dependences of the NMR spin-lattice and spin-spin relaxation times and the NMR spectra of  15 N in TI 15 NO 2  were observed in the plastic phase (282.4 K &lt; T &lt; 459 K) and the low-temperature phase. From the analysis of  15 N NMR data, we attributed the motion reported in dielectric and TI NMR studies in the low-temperature phase to the 180°-flip of NO 2  -  ions which takes place with an activation energy of 14 kJ mol -1 . In the plastic phase, we detected isotropic NO 2  -  reorientation with an activation energy of 13.5 kJ mol -1  and a new anionic motion with 10 kJ mol -1 .

Dynamics of Nitrite Ions in the Ionic Plastic Crystal TINO 2 studied by 15 N and 205 TI NMR