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The dynamics of excited state structural relaxation of 4- dimethylaminobenzonitrile (DMABN) and related compoundsстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Volchkov V., Uzhinova L., Uzhinov B.
- Журнал: International Journal of Photoenergy
- Том: 8
- Номер: 1
- Год издания: 2006
- Издательство: Hindawi Publishing Corporation
- Местоположение издательства: United States
- Первая страница: 25
- Последняя страница: 28
- DOI: 10.1155/IJP/2006/81896
- Аннотация: The excited state structural relaxation of 4-dimethylaminobenzenes with various para-acceptor substituents having double-band emission, local excited (LE) and charge transfer (CT), has been investigated. Fluorescence measurements at different temperatures and in different solvents have confirmed the existence of viscosity-dependent, temperature, and polarity-activated relaxation. The kinetics analysis has shown that the radiative deactivation rate constants of the individual LE and CT states differ by 7-112-fold. The dipole moment changes at the excitation for CT states are significantly larger than those for LE states. The spectral-kinetics behavior of compounds studied agrees with the models A → A* → B* or A → A* ↔ B*, where A* is the local excited planar and B* is the relaxed twisted state of the molecule. The rate constants of the twisted state formation have been calculated in the temperature range 293-77 K. The activation energies of forward process for compounds studied have been estimated. Copyright © 2006 Valery Volchkov et al.
- Добавил в систему: Ужинова Любовь Дмитриевна