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

被引：0
作者：
L. Wojnárovits
G. Földiák
M. D'Angelantonio
S. S. Emmi
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来源：
Research on Chemical Intermediates | 2002年 / 28卷
关键词：
Radical Cation; Optical Spectroscopy; Rate Coefficient; Type Radical; Phenoxyl;
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摘要：
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 coefficient 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–1 dm3 s–1. These findings were interpreted in terms of acid-base 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.
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页码：373 / 386
页数：13
相关论文
共 75 条
[11]  
Serpone N.(1986)undefined Radiat. Phys. Chem. 28 443-undefined
[12]  
Fox M. A.(1988)undefined Radiat. Phys. Chem. 31 121-undefined
[13]  
Choure S. C.(1984)undefined J. Phys. Chem. 88 2091-undefined
[14]  
Bamatraf M. M. M.(1998)undefined Res. Chem. Intermed. 24 1-undefined
[15]  
Rao B. S. M.(1988)undefined J. Radioanal. Nucl. Chem., Articles 125 19-undefined
[16]  
Das R.(1963)undefined Trans. Faraday Soc. 59 2016-undefined
[17]  
Mohan H.(1997)undefined Radiat. Phys. Chem. 50 377-undefined
[18]  
Mittal J. P.(1987)undefined J. Chem. Soc., Faraday Trans. I 83 113-undefined
[19]  
Wang K.-H.(1995)undefined J. Chem. Soc., Faraday Trans. 91 2121-undefined
[20]  
Hsieh Y.-H.(1993)undefined J. Phys. Chem. 97 11278-undefined
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