Conclusions
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1.
The kinetics of quenching the triplet states of quinones by phenols in liquid solutions are determined by the process of forming a hydrogen-bond complex between the triplet and the quenching agent and by transfer of a hydrogen atom in this complex.
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2.
The isotope effect for the rate constant in quenching triplet states of quinones by phenols first increases with increasing acidity of the phenol, and then drops off.
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3.
The quantum yields of phenoxyl and semiquinone radicals formed by quenching triplet states of quinones by phenols are usually close to 100%, In quenching by phenols with strong acidic properties, the quantum yield of the radicals is lower if the triplet state of the quinone has a low energy.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 765–771, April, 1984.
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Kokrashvili, T.A., Levin, P.P. & Kuz'min, V.A. Quenching of triplet states of quinones by phenols. Russ Chem Bull 33, 702–708 (1984). https://doi.org/10.1007/BF00947818
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DOI: https://doi.org/10.1007/BF00947818