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Spectral and photochemical properties of isomeric styrylbenzoquinolines

  • Photochemistry
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Abstract

Photochemical properties of the annelated 2-styrylquinoline (2SQ) derivatives 2-styryl-benzo[g]quinoline (2SBQ) and 3-styrylbenzo[f]quinoline (3SBQ) and 3-styrylacridine (3SA) have been investigated by experimental and quantum-chemical methods. It has been found that the trans-isomer of 3SBQ undergoes the photoisomerization reaction with a quantum yield of φtc= 0.19, which increases to 0.44 for the protonated form, with the fluorescence quantum yield decreasing from 0.74 to 0.09. In contrast, the trans-isomers of 2SBQ and 3SA are photochemically inert in both neutral and protonated forms, φtc < 10−3. Quantum-chemical calculation by the PM3 method show that the difference in photochemical properties of 2SBQ and 3SBQ is due to the difference in the structure of frontier molecular orbitals, which, in turn, results in the difference of the shape of the potential energy surface of excited S1 states. Comparison of the properties of 2SBQ and 3SBQ with those of 2SQ reveals size and topological effects in the photochemistry of aza-diarylethylenes.

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, pr. Akademika Semenova 1, Chernogolovka, Moscow oblast, 142432, Russia

    M. F. Budyka, V. M. Li & N. I. Potashova

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  1. M. F. Budyka
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  2. V. M. Li
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  3. N. I. Potashova
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Correspondence to M. F. Budyka.

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Original Russian Text © M.F. Budyka, V.M. Li, N.I. Potashova, 2013, published in Khimiya Vysokikh Energii, 2013, Vol. 47, No. 3, pp. 196–203.

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Budyka, M.F., Li, V.M. & Potashova, N.I. Spectral and photochemical properties of isomeric styrylbenzoquinolines. High Energy Chem 47, 107–114 (2013). https://doi.org/10.1134/S0018143913030028

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  • DOI: https://doi.org/10.1134/S0018143913030028

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