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Primary processes in the thiacyanine dimer-photosensitized reduction of p-nitroacetophenone in water by

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Abstract

Primary processes in the reduction of p-nitroacetophenone (p-NAP) by ascorbic acid (AA) in water photosensitized by thiacyanine dimers M 2−2 have been considered. For M 2−2 , the quantum yields of fluorescence and intersystem crossing to the triplet state (M 2−2 )T increases in comparison to the monomers M−. The dimers (M 2−2 )T enter into the reactions of both one-electron photoreduction by ascorbic acid to give AA+· and M 3∸2 and one-electron photooxidation by p-nitroacetophenone to give p-NAP−· and the dimeric radical anion M ∸2 which dissociates to M− and M· within 25–30 μs. The primary oxidative or reductive photosensitization in the ternary systems containing (M 2−2 )T, p-NAP, and AA affords p-NAP−· and AA+·.

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Authors and Affiliations

  1. Photochemistry Center, Russian Academy of Sciences, ul. Novatorov 7a, Moscow, 119421, Russia

    G. V. Zakharova & A. K. Chibisov

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  1. G. V. Zakharova
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  2. A. K. Chibisov
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Correspondence to G. V. Zakharova.

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Original Russian Text © G.V. Zakharova, A.K. Chibisov, 2013, published in Khimiya Vysokikh Energii, 2013, Vol. 47, No. 6, pp. 471–476.

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Zakharova, G.V., Chibisov, A.K. Primary processes in the thiacyanine dimer-photosensitized reduction of p-nitroacetophenone in water by. High Energy Chem 47, 322–326 (2013). https://doi.org/10.1134/S001814391306012X

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  • DOI: https://doi.org/10.1134/S001814391306012X

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