Conclusions
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1.
Hydrogen-atom transfer in quenching of triplet states of quinones by secondary aromatic amines takes place by establishment of prototropic equilibrium in the radical pair due to electron transfer. Electron transfer is the first event in quenching.
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2.
The characteristics of the effect of the substituents and the medium on the position of prototropic equilibrium between radical pairs of neutral and charged radicals were established. A V-shaped dependence of the equilibrium constant on dielectric permeability in nonsolvating solvents was found. The specific solvation of hydroxyl-containing solvents results in a significant shift in the equilibrium toward formation of ion-radicals.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 284–290, February, 1983.
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Levin, P.P., Kokrashvili, T.A. & Kuz'min, V.A. Effect of solvent and substituents on electron and hydrogen atom transfer in quenching of quinone triplets by secondary aromatic amines. Russ Chem Bull 32, 251–257 (1983). https://doi.org/10.1007/BF00957926
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DOI: https://doi.org/10.1007/BF00957926