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Complexation of Methylthio and Methoxy Derivatives of Styryl Dyes with Cucurbit[6]urilстатья
- Авторы: Ivanov D.A., Kolesnikova O.P., Kryukov I.V., Dubinets N.O., Petrov N.Kh, Aleksandrova N.A., Gromov S.P.
- Журнал: High Energy Chemistry
- Том: 57
- Номер: 3
- Год издания: 2023
- Издательство: Pleiades Publishing, Ltd
- Местоположение издательства: Road Town, United Kingdom
- Первая страница: 410
- Последняя страница: 415
- DOI: 10.1134/S0018143923090060
- Аннотация: The complexation of the styryl dyes 1-ethyl-4-{(E)-2-[4-(methylthio)phenyl]vinyl}pyridinium perchlorate (1) and 1-ethyl-4-[(E)-2-(4-methoxyphenyl)vinyl]pyridinium perchlorate (2) with cucurbit[6]uril (CB[6]) in aqueous solutions has been studied using steady-state and time-resolved fluorescence spectroscopy. The binding constant of the 1 : 1 inclusion complex of 1 and CB[6] is logK = 6.28, with fluorescence increasing threefold, and the 1 : 1 complex of 2 and CB[6] has logK = 5.99, with fluorescence increasing by four times. The fluorescence decay of the dyes and their complexes has two characteristic times, the short one of ~2–3 ps and the long one on the order of ten picoseconds. In inclusion complexes, the latter is greater than in the free dyes. The mechanism of photobleaching of the studied dyes and their complexes with cucurbit[6]uril is considered.
- Добавил в систему: Громов Сергей Пантелеймонович