Reduction of 1,4-quinone and ubiquinones by hydrogen atom transfer under UVA irradiation

Cristiano Biondi, Roberta Galeazzi, Gianpaolo Littarru, Lucedio Greci

Research output: Contribution to journalArticlepeer-review


1,4-Benzoquinone, coenzyme Q0 and Q10 were reacted with a series of hydrogen donors in the ESR cavity in the presence or absence of UVA irradiation. The signals of the radicals generated from the hydrogen donors or of those of the semiquinones were detected. The reaction mechanism was interpreted by a hydrogen atom transfer instead of the usual electron transfer mechanism on the basis of the redox potentials of the reactants and the Marcus theory. The hydrogen atom transfer is explained by the excited triplet state of quinones, which, on the basis of quantum mechanic calculations, may be reached even under visible light. In some cases, hydrogen atom transfer was also observed without irradiation, although to a lesser extent.

Original languageEnglish
Pages (from-to)399-404
Number of pages6
JournalFree Radical Research
Issue number4
Publication statusPublished - Apr 1 2002


  • Hydrogen abstraction
  • Marcus theory
  • Redox potentials
  • Ubiquinones

ASJC Scopus subject areas

  • Biochemistry


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