Abstract
We have measured the dynamics of solvation of a triplet state probe, quinoxaline, in the glass-forming dipolar liquid butyronitrile near its glass transition temperature Tg=95K. The Stokes shift correlation function displays a relaxation time dispersion of considerable magnitude and the optical linewidth changes along the solvation coordinate in a nonmonotonic fashion. These features are characteristic of solvation in viscous solvents and clearly indicate heterogeneous dynamics, i.e., spatially distinct solvent response times. Using the dielectric relaxation data of viscous butyronitrile as input, a microscopic model of dipolar solvation captures the relaxation time, the relaxation dispersion, and the amplitude of the dynamical Stokes shift remarkably well.
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Dates
Type | When |
---|---|
Created | 19 years, 1 month ago (July 13, 2006, 6:18 p.m.) |
Deposited | 1 year, 6 months ago (Feb. 5, 2024, 4:08 a.m.) |
Indexed | 4 weeks, 1 day ago (July 30, 2025, 6:46 a.m.) |
Issued | 19 years, 1 month ago (July 13, 2006) |
Published | 19 years, 1 month ago (July 13, 2006) |
Published Online | 19 years, 1 month ago (July 13, 2006) |
Published Print | 19 years, 1 month ago (July 14, 2006) |
@article{Ito_2006, title={Solvent response and dielectric relaxation in supercooled butyronitrile}, volume={125}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.2212420}, DOI={10.1063/1.2212420}, number={2}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Ito, Naoki and Duvvuri, Kalyan and Matyushov, Dmitry V. and Richert, Ranko}, year={2006}, month=jul }