Photoinduced transformations of 3,3′-diethylthiacarbocyanine in water in the presence of 9-anthracene carboxylic acid as sensitizer: the influence of cucurbit[7]uril

Photoinduced transformations of 3,3′-diethylthiacarbocyanine in water in the presence of 9-anthracene carboxylic acid as sensitizer: the influence of cucurbit[7]uril

The effect of cucurbit[7]uril (CB7) on photo induced transformations of cationic dye 3,3′-diethylthiacarbocyanine iodide (Dye + ) in water in the presence of 9-anthracene carb oxylic acid as photosensitizer was studied by nanosecond laser photolysis. Sensitized photoexcitation of Dye + leads to popu...

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Bibliographic Details
Published in:Russian chemical bulletin Vol. 69; no. 5; pp. 971 - 979
Main Authors: Atabekyan, L. S., Avakyan, V. G., Markelov, V. P., Svyatoslavskaya, T. A., Svyatoslavsky, N. L., Chibisov, A. K.
Format: Journal Article
Language:English
Published: New York Springer US 01-05-2020
Springer Nature B.V
Subjects:
Absorption spectra
Anthracene
Carboxylic acids
Cationic dyes
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Dimerization
Dyes
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Inorganic Chemistry
Organic Chemistry
Photoexcitation
Photolysis
Quantum chemistry
triplet state
trans—cis isomerization
fluorescence
laser pulsed photolysis
quantum chemical calculations
dimerization
radical cation
cucurbit -uril
DFT and TDDFT methods
sensitized photoexcitation
3,3′-diethylthiacarbocyanine iodide
9-anthracene carboxylic acid
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Summary:The effect of cucurbit[7]uril (CB7) on photo induced transformations of cationic dye 3,3′-diethylthiacarbocyanine iodide (Dye + ) in water in the presence of 9-anthracene carb oxylic acid as photosensitizer was studied by nanosecond laser photolysis. Sensitized photoexcitation of Dye + leads to population of the triplet level of the dye. The photoisomerization proceeds via the formation of an intermediate “perpendicular” form of the dye molecule characterized by two absorption bands, as follows from the results of quantum chemical calculations. The presence of CB7 in the dye solution leads to an increase in the lifetime of triplet molecules and in the yield of the diradical cation as a result of dimerization of the dye molecules.
ISSN:1066-5285
1573-9171
DOI:10.1007/s11172-020-2857-9