Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 115, Issue 24, Pages 6481-6487Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp201537k
Keywords
-
Funding
- James-Franck German-Israeli Program in Laser-Matter Interaction
- Clore scholars program
Ask authors/readers for more resources
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, k(nr), decreases with pressure. We further found a remarkable linear correlation between a decrease in k(nr) (increase in the nonradiative lifetime, tau(nr)) 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 (15 ns)(-1) for 1-propanol, 1-butanol, and 1-pentanol, respectively. The viscosity-dependence of k(nr) is explained by the excited-state rotation rate of the two-ring systems, with respect to each other.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available