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Photoprocesses of Bis(diethylaminobenzylidene)cyclopentanone upon Nanosecond Laser and Continuous Irradiation in Acetonitrile

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Abstract

Spectral, luminescent, and kinetic properties of 2,5-bis(4-diethylaminobenzylidene)cyclopentanone (ketocyanine, A) in air-saturated and oxygen-free acetonitrile have been studied. The ns-Laser and continuous photoexcitation of A results in a product B undergoing in the oxygen-free solution the intersystem crossing into the triplet state with the lifetime of 1 µs. The photoinduced conversion of A into B occurs within a time shorter than 1 µs and is manifested in a decrease in both the fluorescence intensity of A and absorbance at 457 nm and in the appearance of a new absorption at λ > 535 nm. The product B undergoes photoinduced conversion to the parent A via both the excited singlet and triplet states of B.

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ACKNOWLEDGMENTS

The study was supported by the Russian Scienсe Foundation, project no. 14-13-00076 (synthesis and stationary irradiation of ketocyanines) and by the Federal Agency of Scientific Organizations, agreement no. № 007-GZ/Ch3363/26 (pulsed laser irradiation of ketocyanines).

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Authors and Affiliations

  1. Photochemistry Center, “Crystallography and Photonics” Federal Research Center, Russian Academy of Sciences, 119421, Moscow, Russia

    V. N. Gutrov, G. V. Zakharova, F. S. Zyuz’kevich, V. N. Nuriev, S. Z. Vatsadze, S. P. Gromov & A. K. Chibisov

  2. Faculty of Chemistry, Moscow State University, 119991, Moscow, Russia

    V. N. Nuriev, S. Z. Vatsadze & S. P. Gromov

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  1. V. N. Gutrov
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  2. G. V. Zakharova
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  3. F. S. Zyuz’kevich
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  4. V. N. Nuriev
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  5. S. Z. Vatsadze
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  6. S. P. Gromov
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  7. A. K. Chibisov
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Corresponding authors

Correspondence to G. V. Zakharova or S. P. Gromov.

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Translated by T. Nekipelova

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Gutrov, V.N., Zakharova, G.V., Zyuz’kevich, F.S. et al. Photoprocesses of Bis(diethylaminobenzylidene)cyclopentanone upon Nanosecond Laser and Continuous Irradiation in Acetonitrile. High Energy Chem 52, 475–479 (2018). https://doi.org/10.1134/S0018143918060061

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  • DOI: https://doi.org/10.1134/S0018143918060061

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