Mechanism of OH radical-induced oxidation of p-cresol to p-methylphenoxyl radical

L. Wojnárovits, G. Földiák, M. D'Angelantonio, S. S. Emmi

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The OH radical-induced oxidation of p-cresol to p-methylphenoxyl radical was studied in aqueous solution in a wide pH range by means of pulse radiolysis combined with optical spectroscopy. OH-adduct cyclohexadienyl type radicals were identified as intermediates of the reaction. In the acidic pH range the first-order rate coefficients of phenoxyl radical formation was found linearly dependent on the H3O+ concentration yielding a bimolecular rate coefficient of 1.8 × 108 mol-1 dm3 s-1. In the alkaline range a linear dependence was found on the OH- concentration with rate coefficient of 4.9 × 1010 mol- dm3 s-1. These findings were interpreted in terms of acid-based catalysis of the H2O elimination from the OH-adduct. With the time resolution applied, 30 ns, the radical cation p-CH3C6H4OH+• was not observed as intermediate.

Original languageEnglish
Pages (from-to)373-386
Number of pages14
JournalResearch on Chemical Intermediates
Volume28
Issue number4
DOIs
Publication statusPublished - 2002

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Oxidation
Radiolysis
Catalysis
Cations
Acids
hydroxide ion
4-cresol
phenoxy radical
Optical spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Mechanism of OH radical-induced oxidation of p-cresol to p-methylphenoxyl radical. / Wojnárovits, L.; Földiák, G.; D'Angelantonio, M.; Emmi, S. S.

In: Research on Chemical Intermediates, Vol. 28, No. 4, 2002, p. 373-386.

Research output: Contribution to journalArticle

Wojnárovits, L. ; Földiák, G. ; D'Angelantonio, M. ; Emmi, S. S. / Mechanism of OH radical-induced oxidation of p-cresol to p-methylphenoxyl radical. In: Research on Chemical Intermediates. 2002 ; Vol. 28, No. 4. pp. 373-386.
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