A. Morresi et al., Rotational dynamics in liquid acetonitrile. Temperature and concentration effects in the non-ideal CH3CN/CCl4 mixture, PHYS CHEM P, 2(13), 2000, pp. 2857-2861
The effect of both temperature and dilution on the orientational relaxation
rate of acetonitrile has been considered. The half bandwidths obtained by
Raman scattering and infrared absorption techniques were corrected consider
ing the effective temperature of the scattering volume in the Raman, and th
e thermostatic temperature in the IR experiments. This procedure, adopted f
or the first time in studies of dynamical processes, has shown the presence
of two different dynamic regimes in the CH3CN/CCl4 solutions, due to the l
ow-boiling azeotropic mixture. The results obtained have been discussed wit
hin the framework of the rotational diffusion theory. Experimental values o
f the molecular and hydrodynamic volumes of acetonitrile were compared with
the respective theoretical values.