Rotational dynamics in liquid acetonitrile. Temperature and concentration effects in the non-ideal CH3CN/CCl4 mixture

Citation
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
Citations number
38
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN journal
14639076 → ACNP
Volume
2
Issue
13
Year of publication
2000
Pages
2857 - 2861
Database
ISI
SICI code
1463-9076(2000)2:13<2857:RDILAT>2.0.ZU;2-1
Abstract
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.