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

A. D. Svirida; Свирида А. Д.; D. A. Ivanov; Иванов Д. А.; I. V. Kryukov; Крюков И. В.; N. Kh. Petrov; Петров Н. Х.; N. A. Aleksandrova; Александрова Н. А.; V. G. Avakyan; Авакян В. Г.; S. P. Gromov; Громов С. П.

doi:10.31857/S0023119323020146

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

Authors: Svirida A.D.¹, Ivanov D.A.¹, Kryukov I.V.¹, Petrov N.K.¹, Aleksandrova N.A.¹, Avakyan V.G.¹, Gromov S.P.¹^,2
Affiliations:
1. Photochemistry Center, Russian Academy of Sciences, Federal Research Center Crystallography and Photonics, Russian Academy of Sciences
2. Faculty of Chemistry, Moscow State University
Issue: Vol 57, No 2 (2023)
Pages: 100-107
Section: PHOTONICS
URL: https://journals.rcsi.science/0023-1193/article/view/139967
DOI: https://doi.org/10.31857/S0023119323020146
EDN: https://elibrary.ru/NHPEJK
ID: 139967

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Abstract

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.

Keywords

guest–host complexes, styryl dyes, cucurbiturils, picosecond fluorescence spectroscopy, quantum-chemical calculations

References

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