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Complexation of bis-crown stilbene with alkali and alkaline-earth metal cations. Ultrafast excited state dynamics of the stilbene-viologen analogue charge transfer complexстатья
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: 22 февраля 2018 г.
- Авторы: Volchkov V.V., Rusalov M.V., Gostev F.E., Shelaev I.V., Nadtochenko V.A., Vedernikov A.I., Efremova A.A., Kuz'mina L.G., Gromov S.P., Alfimov M.V., Melnikov M.Ya
- Журнал: Journal of Physical Organic Chemistry
- Том: 31
- Номер: 2
- Год издания: 2018
- Издательство: John Wiley & Sons Inc.
- Местоположение издательства: United States
- Первая страница: е3759
- DOI: 10.1002/poc.3759
- Аннотация: The complex formation of bis(18‐crown‐6)stilbene (1) and its supramolecular donor‐acceptor complex with N,N′‐bis(ammonioethyl) 1,2‐di(4‐pyridyl)ethylene derivative (2) with alkali and alkaline‐earth metal perchlorates has been studied using absorption, steady‐state fluorescence, and femtosecond transient absorption spectroscopy. The formation of 1Mn+ and 1(Mn+)2 complexes in acetonitrile was demonstrated. The weak long‐wavelength charge‐transfer absorption band of 1·2 completely vanishes upon complexation with metal cations because of disruption of the pseudocyclic structure. The spectroscopic and luminescence parameters, stability constants, and 2‐stage dissociation constants were calculated. The initial stage of a recoordination process was found in the excited complexes 1M+ and 1(M+)2 (M = Li, Na). The pronounced fluorescence quenching of 1·2 is explained by very fast back electron transfer (τet = 0.397 ps). The structure of complex 1·2 was studied by X‐ray diffraction; stacked (1·2)m polymer in which the components were connected by hydrogen bonding and stacking was found in the crystal. These compounds can be considered as novel optical molecular sensors for alkali and alkaline‐earth metal cations.
- Добавил в систему: Мельников Михаил Яковлевич