Controlling photophysics of styrylnaphthalimides through TICT, fluorescence and E,Z-photoisomerization interplay

Panchenko, P.A.; Arkhipova, A.N.; Fedorova, O.A.; Fedorov, Y.V.; Zakharko, M.A.; Arkhipov, D.E.; Gediminas, J.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 5 июня 2017 г.

Авторы: Panchenko Pavel A., Arkhipova Antonina N., Fedorova Olga A., Fedorov Yuri V., Zakharko Marina A., Arkhipov Dmitry E., Gediminas Jonusauskas
Журнал: Physical Chemistry Chemical Physics
Том: 19
Номер: 3
Год издания: 2017
Издательство: Royal Society of Chemistry
Местоположение издательства: United Kingdom
Первая страница: 1244
Последняя страница: 1256
DOI: 10.1039/c6cp07255k
Аннотация: The photophysical properties of naphthalimide dyes NI1–3 with electron releasing 4-methoxy- (NI1), 3,4-dimethoxystyryl- (NI2) and dimethylaminostyryl (NI3) groups are examined in a variety of protic and aprotic solvents. All compounds demonstrate positive solvatochromism in the steady-state absorption and fluorescence spectra. The analysis of the dependence of the Stokes shift on the polarity of the solvent using the Lippert–Mataga equation allowed us to determine the change in the dipole moment upon excitation. The obtained data correspond to the formation of highly polar charge transfer states. Based on the transient absorption spectra and time-resolved fluorescence measurements, the presence of two different emissive states was definitely proved. The primarily formed planar Local Excited (LE) state dominates in non-polar solvents like cyclohexane and toluene where it relaxes mostly through fluorescence and E,Z-isomerisation pathways. In polar solvents, an alternative relaxation channel emerges that consists of twisting around single bond between styryl and naphthalimide fragments, which leads to the formation of a Twisted Intramolecular Charge Transfer (TICT) state. The factors affecting the fluorescence of TICT states are discussed. The observed spectral effects are rationalized using quantum-chemical calculations, X-ray data and NMR spectroscopy.
Добавил в систему: Федоров Юрий Викторович

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Controlling photophysics of styrylnaphthalimides through TICT, fluorescence and E,Z-photoisomerization interplayстатья

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