Arylperoxyl radicals. Formation, absorption spectra, and reactivity in aqueous alcohol solutions

Z. B. Alfassi, G. I. Khaikin, P. Neta

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


Aryl radicals (phenyl, 4-biphenylyl, 2-naphthyl, 1-naphthyl, and 9-phenanthryl) were produced by the reaction of the corresponding aryl bromide with solvated electrons and reacted rapidly with oxygen to produce the arylperoxyl radicals. These radicals exhibit optical absorptions in the visible range, with 2max at 470, 550, 575, 650, and 700 nm, respectively. Arylperoxyl radicals react with 2,2′-azinobis(3-ethylbenzothiazoiine-6-sulfonate ion) (ABTS), chlorpromazine, and 6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid (Trolox C) by one-electron oxidation. The rate constants k for these reactions, determined from the rate of formation of the one-electron oxidation products as a function of substrate concentration, vary between 4 × 106 and 2 ×109 L mol-1 s-1 and increase in the order phenyl-, 4-biphenyl-, 2-naphthyl-, 1-naphthyl-, and 9-phenanthrylperoxyl, the same order as the absorption peaks of these radicals. Good correlation was found between log k and the energy of the absorption peak.

Original languageEnglish
Pages (from-to)265-268
Number of pages4
JournalJournal of Physical Chemistry
Issue number1
StatePublished - 1 Jan 1995
Externally publishedYes

ASJC Scopus subject areas

  • General Engineering
  • Physical and Theoretical Chemistry


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