Abstract
The kinetics and the mechanism of the reaction of donor (ascorbic acid) oxidation by electron acceptors (methylviologen and p-nitroacetophenone) photosensitized by dimers of sulfoalkyl-9-ethylthiacarbocyanine dyes (Dye1, Dye2, and Dye3) were studied in aqueous solutions. Dimers of the dyes (dianions) are capable of transition to the triplet state that is mainly quenched by acceptors to form radical anions of dimers, which are unstable and dissociate within 10–12 μs into the monomer (anion) and its radical (the limiting reaction stage). The presence of a donor in the dye-acceptor mixture leads to one-electron reduction of the monomer radical to its anion followed by the dimerization reaction. The results of the analysis of the experimental data obtained by the laser photolysis technique are in good agreement with the calculated kinetic curves for the formation and the decay of the dimer radical anions.
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Original Russian Text © A.K. Chibisov, T.D. Slavnova, G.V. Zakharova, H. Görner, 2007, published in Khimiya Vysokikh Energii, 2007, Vol. 41, No. 5, pp. 395–401.
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Chibisov, A.K., Slavnova, T.D., Zakharova, G.V. et al. Primary processes in the photosensitized redox reaction of dimers of thiacarbocyanine dyes. High Energy Chem 41, 344–349 (2007). https://doi.org/10.1134/S0018143907050074
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DOI: https://doi.org/10.1134/S0018143907050074