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Proton-controlled photoisomerization of 1-(2-pyridyl)-2-(2-quinolyl)ethylene

  • Photochemistry
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Abstract

Quantum-chemical calculations (B3LYP/6-31G*) predict the formation of intramolecular hydrogen bond (IMHB) in the monoprotonated Z-isomer of 1-(2-pyridyl)-2-(2-quinolyl)ethylene (2P2Q), with this bond stabilizing the isomer relative to its E-counterpart. An experimentally observed increase in the quantum yield of trans-cis photoisomerization (φtc) by more than an order of magnitude (from 0.033 to 0.42 in acetonitrile) on passing from the neutral to the monoprotonated form of 2P2Q can be associated with IMHB, which manifested itself in the spectral properties of the Z-isomer. The IMHB breaks in the diprotonated form, and the value of φtc decreases back to the initial value. In addition to the photoisomerization, the photoreduction and photoaddition reactions of solvent molecules have been observed in an ethanol solution of 2P2Q.

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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. Lee, N. I. Potashova & T. N. Gavrishova

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  1. M. F. Budyka
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  2. V. M. Lee
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  3. N. I. Potashova
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  4. T. N. Gavrishova
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Correspondence to M. F. Budyka.

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Original Russian Text © M.F. Budyka, V.M. Lee, N.I. Potashova, T.N. Gavrishova, 2011, published in Khimiya Vysokikh Energii, 2011, Vol. 45, No. 2, pp. 144–151.

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Budyka, M.F., Lee, V.M., Potashova, N.I. et al. Proton-controlled photoisomerization of 1-(2-pyridyl)-2-(2-quinolyl)ethylene. High Energy Chem 45, 115–122 (2011). https://doi.org/10.1134/S0018143911020056

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  • DOI: https://doi.org/10.1134/S0018143911020056

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