Photoprocesses in Guest–Host Complexes of a Styryl Dye Thio Derivative with Cucurbiturils

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Resumo

Photoprocesses in aqueous solutions of the styryl dye 1-ethyl-4-{(E)-2-[4(methylthio)phenyl]vinyl}pyridinium perchlorate (1) and its complexes with cucurbit[n]urils (CB[n], n = 6–8) have been studied using the methods of stationary and time-resolved optical spectroscopy. The fluorescence intensity increases by approximately 3 times in 1 : 1 complexes of 1 and CB[6], whereas CB[7] has almost no effect on the fluorescence intensity. In 2 : 1 complexes with CB[8], the photocycloaddition reaction does not occur, with strong fluorescence quenching being associated with the formation of nonreactive dimers. The fluorescence decay kinetics of 1 has two characteristic times, 1.4 and ~130 ps, and changes little in the complexes. The photoinduced intramolecular charge transfer in 1 is an order of magnitude smaller than in the wellknown dye DASPI.

Sobre autores

A. Svirida

Photochemistry Center, Russian Academy of Sciences, Federal Research Center Crystallography and Photonics, Russian Academy of Sciences

Email: ivanovd@photonics.ru
Moscow, 119421 Russia

D. Ivanov

Photochemistry Center, Russian Academy of Sciences, Federal Research Center Crystallography and Photonics, Russian Academy of Sciences

Email: ivanovd@photonics.ru
Россия, 119421, Москва, ул. Новаторов, 7А-1

I. Kryukov

Photochemistry Center, Russian Academy of Sciences, Federal Research Center Crystallography and Photonics, Russian Academy of Sciences

Email: ivanovd@photonics.ru
Moscow, 119421 Russia

N. Petrov

Photochemistry Center, Russian Academy of Sciences, Federal Research Center Crystallography and Photonics, Russian Academy of Sciences

Email: ivanovd@photonics.ru
Moscow, 119421 Russia

N. Aleksandrova

Photochemistry Center, Russian Academy of Sciences, Federal Research Center Crystallography and Photonics, Russian Academy of Sciences

Email: ivanovd@photonics.ru
Moscow, 119421 Russia

V. Avakyan

Photochemistry Center, Russian Academy of Sciences, Federal Research Center Crystallography and Photonics, Russian Academy of Sciences

Email: ivanovd@photonics.ru
Moscow, 119421 Russia

S. Gromov

Photochemistry Center, Russian Academy of Sciences, Federal Research Center Crystallography and Photonics, Russian Academy of Sciences; Faculty of Chemistry, Moscow State University

Autor responsável pela correspondência
Email: ivanovd@photonics.ru
Moscow, 119421 Russia; Moscow, 119991

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Declaração de direitos autorais © А.Д. Свирида, Д.А. Иванов, И.В. Крюков, Н.Х. Петров, Н.А. Александрова, В.Г. Авакян, С.П. Громов, 2023