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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Pressure effect on the nonradiative process of thioflavin-T
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Pressure effect on the nonradiative process of thioflavin-T

机译：压力对硫黄素-T非辐射过程的影响

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摘要

Time-resolved emission techniques were employed to study the nonradiative 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 k_(nr_ (increase in the nonradiative lifetime, T_(nr)) and an increase in the solvent viscosity. The viscosity was varied by a factor of 1000 and k_(nr) 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.
机译：采用时间分辨发射技术研究了硫代黄素-T（ThT）在1-丙醇，1-丁醇和1-戊醇中的非辐射过程随静水压力的变化。升高的静水压力会增加醇的粘度，进而严重影响ThT的非辐射速率。使用金刚石砧盒将压力提高到2.4 GPa。我们发现，非辐射速率常数knr随着压力而降低。我们还发现k_（nr_（非辐射寿命的增加，T_（nr）的增加）与溶剂粘度的增加之间存在显着的线性相关性，粘度变化了1000倍，测量了k_（nr）。在高压下，分子的非辐射速率常数从（7 ps）〜（-1）降低到（13 ns）〜（-1），（13 ps）〜（-1）到（17 ns）〜 1-丙醇，1-丁醇和1-戊醇分别为（-1）和（17 ps）〜（-1）至（15 ns）〜（-1），k_（nr）的粘度依赖性为这是由两环系统的激发态旋转速度相对于彼此解释的。

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