期刊
FREE RADICAL RESEARCH
卷 36, 期 4, 页码 399-404出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/10715760290021243
关键词
ubiquinones; hydrogen abstraction; redox potentials; Marcus theory
1,4-Benzoquinone, coenzyme Q(0) and Q(10) 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.
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