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Pressure Effect on the Nonradiative Process of Thioflavin-T.
- Source :
-
Journal of Physical Chemistry A . Jun2011, Vol. 115 Issue 24, p6481-6487. 7p. - Publication Year :
- 2011
-
Abstract
- Time-resolved emission techniques were employed to study the non-radiative process of thioflavin-T (ThT) in 1-propanol, 1-butanol, and 1-pentanol as a function of the hydrostatic pressure. Elevated hydrostatic pressure increases the alcohol viscosity, which in turn strongly influences the nonradiative rate of ThT. A diamond-anvil cell was used to increase the pressure up to 2.4 GPa. We found that the nonradiative rate constant, knr, decreases with pressure. We further found a remarkable linear correlation between a decrease in knr (increase in the nonradiative lifetime, τnr) and an increase in the solvent viscosity. The viscosity was varied by a factor of 1000 and knr was measured at high pressures, at which the nonradiative rate constant of the molecules decreased from (7 ps)-1 to (13 ns)-1, (13 ps)-1 to (17 ns)-1 and (17 ps)- 1 to (IS ns)-1 for 1-propanol, 1-butanol, and 1-pentanol, respectively. The viscosity-dependence of knr is explained by the excited-state rotation rate of the two-ring systems, with respect to each other. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PENTANOL
*VISCOSITY
*BUTANOL
*MOLECULES
*HYDROSTATICS
Subjects
Details
- Language :
- English
- ISSN :
- 10895639
- Volume :
- 115
- Issue :
- 24
- Database :
- Academic Search Index
- Journal :
- Journal of Physical Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 69885534
- Full Text :
- https://doi.org/10.1021/jp201537k