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Excited-state photophysics and dynamics of a hemicyanine dye in AOT reverse micelles

Title
Excited-state photophysics and dynamics of a hemicyanine dye in AOT reverse micelles
Authors
Kim, JLee, M
Ewha Authors
이민영
SCOPUS Author ID
이민영scopus
Issue Date
1999
Journal Title
JOURNAL OF PHYSICAL CHEMISTRY A
ISSN
1089-5639JCR Link
Citation
vol. 103, no. 18, pp. 3378 - 3382
Publisher
AMER CHEMICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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.
DOI
10.1021/jp984167e
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자연과학대학 > 화학·나노과학전공 > Journal papers
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