Excited-state photophysics and dynamics of a hemicyanine dye in AOT reverse micelles
Excited-state photophysics and dynamics of a hemicyanine dye in AOT reverse micelles
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DOI：
10.1021/jp984167e
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发表时间：
1999-05-06
影响因子：
2.9
通讯作者：
Lee, M
中科院分区：
文献类型：
--
作者：
Kim, J;Lee, M
研究了光激发半花菁染料trans-3-[4-(dimethylanlino)-styryl]-1-methylpyridinium碘在含水反胶束中的内旋转行为。通过改变水/琥珀酸磺酸钠(AOT)-烷烃-水溶液中不同尺寸的水纳米团簇(半径约0.6-5.6 nm)的荧光寿命，得到了扭转运动的速率常数。观察到DASPI在反胶束形成的水池中的荧光寿命随着纳米团簇尺寸的减小而显著延长，这表明反胶束的微观结构对激发态扭转运动有显著的影响。努力将内旋转的速率过程与水池特性(如极性和粘度)联系起来。
The internal rotation of a photoexcited hemicyanine dye, trans-3-[4-(dimethylanlino)-styryl]-1-methylpyridinium iodide (DASPI), was investigated in water-containing reverse micelles. The rate constants for the twisting motion were obtained from the measured fluorescence lifetimes in various sizes of water nanoclusters (ca. 0.6-5.6 nm in radius) prepared from sodium bis(2-ethylhexyl) sulfosuccinate (AOT)-alkane-water solutions by changing the molar ratio of water/AOT. It was observed that the fluorescence lifetime of DASPI in the water pool formed by the reverse micelle markedly increases as the nanocluster size decreases, implying that the excited-state twisting motion is significantly influenced by the microstructure of the reverse micelle. An endeavor was made to relate the rate process for internal rotation to water pool characteristics such as polarity and viscosity.