|
ИСТИНА |
Войти в систему Регистрация |
Интеллектуальная Система Тематического Исследования НАукометрических данных |
||
Crown-containing butadienyl dyes - 5. Structure and photoisomerization of a butadienyl dye containing a 15-crown-5 fragmentстатья
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: Ushakov E.N., Gromov S.P., Kuz'mina L.G., Vedernikov A.I., Avakyan V.G., Howard J.A.K, Alfimov M.V.
- Журнал: Russian Chemical Bulletin
- Том: 53
- Номер: 7
- Год издания: 2004
- Издательство: Springer Nature
- Местоположение издательства: Switzerland
- Первая страница: 1549
- Последняя страница: 1562
- DOI: 10.1023/B:RUCB.0000046254.69634.50
- Аннотация: The structure of the E,E isomer of a butadienyl dye of the benzothiazole series containing a 15-crown-5 fragment was established by X-ray diffraction analysis. The stacking motif of the dye molecules in the crystal structure is, apparently, attributable to intermolecular pi-interactions between the large conjugated fragments. The possibility of [2+2] photocycloaddition occurring in the crystal is discussed. Reversible geometrical photoisomerization of the dye and its complex with Mg2+ in acetonitrile solution was studied by spectrophotometry and H-1 NMR spectroscopy. Photoirradiation of the complex of the E,E isomer with Mg2+ leads predominantly to isomerization of the C=C bond adjacent to the benzothiazole fragment. Regioselective E,E-->Z,E photoisomerization occurs via a singlet mechanism with a quantum yield of about 0.45. The quantum yield of reverse Z,E-->E,E photoisomerization is approximately 0.52. The structures of different geometrical isomers of the dye complex with Mg2+ were calculated by the quantum-chemical density functional theory (DFT).
- Добавил в систему: Громов Сергей Пантелеймонович