Photochemical Oxidation of Water by 2-Methyl-1,4-benzoquinone: Evidence against the Formation of Free Hydroxyl Radical

Autor:	Daqing Gan, Pamela P. Vaughan, Daniel E. Falvey, Neil V. Blough, Aude Pochon, Peter Vath
Rok vydání:	2002
Předmět:	chemistry.chemical_compound chemistry Radical ion Cobalt-mediated radical polymerization Radical Photodissociation Flash photolysis Methyl radical Hydroxyl radical Physical and Theoretical Chemistry Photochemistry Radical cyclization
Zdroj:	The Journal of Physical Chemistry A. 106:2889-2894
ISSN:	1520-5215 1089-5639
DOI:	10.1021/jp012856b
Popis:	Photolysis of 2-methyl-1,4-benzoquinone (toluquinone) in aqueous solution results in the oxidation of water to create either hydroxyl radical or some species capable of transferring a hydroxyl radical. Trapping of the latter with dimethyl sulfoxide (DMSO) creates a methyl radical which in turn can be trapped by the stable radical 3-amino-2,2,5,5-tetramethyl-1-pyrrolidinyloxy. Competitive trapping studies using DMSO and either nitrite anion or salicylate anion show that the hydroxylating species is much more selective in its reactions than free hydroxyl radical. Laser flash photolysis experiments on toluquinone in aqueous solution show formation of a transient species immediately (
Databáze:	OpenAIRE
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