Thermodynamic and Dynamic Transitions and Interaction Aspects in Reorientation Dynamics of in : A Series of with .

The spectral and dynamic properties of in a series of ranging from to over a temperature range 100-300 K were investigated by ). The main characteristic ESR temperatures connected with slow to fast motion regime transition; 's and 's are situated above the corresponding glass temperatures, , and for the the 's lie above or close to melting point, , while the the < relationship indicates that the are in the local disordered regions of the . The 's and especially 's are compared with the dynamic crossover temperatures, = 8.72, as obtained by fitting the viscosity data in the liquid with the empirical power law. In particular, for > 6, the 's lie rather close to the resembling [PCCP 2018,,11145-11151], while for < 6, they are situated in the vicinity of . The absence of a coincidence for lower indicates that the is significantly influenced by the mutual interaction between the and the due to the increased polarity and proticity destroyed by the larger-scale melting transition.