Figure 2.

¹H (a) and ¹⁹F (b) spin-lattice relaxation rates versus reciprocal temperature for [TEA-C4] [TFSI]. Solid lines—fits with parameters collected in Table 1, dashed red line—fit with parameters give in the text, vertical lines indicate phase transition temperatures ($T_{crys}$ = 229.89 K and $T_m$ = 289.10 K denote the crystallization and melting temperatures [26], respectively).