Molecular photonics of dienones based on cycloalkanones and their derivatives
[Display omitted] •Effect of the structure of cross-conjugated dienones on absorption and fluorescence.•Intermediates of nanosecond laser photolysis of dienones in various media.•Isomer undergoes photoinduced conversion to parent dienone upon irradiation.•Formation of both the radical anion and radi...
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| Published in: | Journal of photochemistry and photobiology. A, Chemistry. Vol. 425; p. 113678 |
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| Main Authors: | , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Elsevier B.V
01-03-2022
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | [Display omitted]
•Effect of the structure of cross-conjugated dienones on absorption and fluorescence.•Intermediates of nanosecond laser photolysis of dienones in various media.•Isomer undergoes photoinduced conversion to parent dienone upon irradiation.•Formation of both the radical anion and radical cation of the dye via triplet state.
Spectroscopic, luminescent, and spectral kinetic properties of cycloalkanone-based dienones and their diethylamino, methylthio, methoxy, and dimethoxy derivatives were studied. The presence of electron-donating substituents results in a red shift of the absorption and fluorescence spectral maxima. A laser pulse causes dienones to undergo intersystem crossing to the underlying triplet state with a lifetime of 0.2–40 μs as well as results in the formation of stable photoproducts capable of photoinduced conversion to the initial dienones. It also gives rise to intermediate products resulting from redox photoreactions of 2,4-bis(4-diethylaminobenzylidene)cyclobutanone in methanol in the presence of electron donor (ascorbic acid) and acceptor (para-nitroacetophenone) compounds. |
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| ISSN: | 1010-6030 1873-2666 |
| DOI: | 10.1016/j.jphotochem.2021.113678 |