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V. A. Kurmaz, A. S. Kotkin, G. V. Simbirtseva

Investifation of electrochemical behaviour of secondary products of oh radicals capture by dimethyl sulfoxide molecules by laser photoemission

Abstract

Electrode reactions of intermediates formed during capture of OH radicals by dimethylsulfoxide molecules were studied by laser photoemission in aqueous buffer solutions and pH range from acidic to basic. The results were compared with characteristics of one-electron reduction of methyl radicals generated via photoemission from methyl halides CH3X (X = Cl; I). It was concluded on intermediates identity in these systems because of the primary product of OH radicals capture by DMSO molecules, i.e. adduct (CH3)2SO(OH), was spontaneously decomposed to form CH3 with the time as low as < 2 × 10–5 s. Some anomalies were found on time-resolved voltammograms of intermediates at pH transition from low basic to low acidic and at illumination times Tm of an electrode with UV light Tm≥ 90–300 ms. These features were presumably caused by rather slow formation of organomercury intermediates as interaction products of components of the system dimethylsulfoxide – OH radical – a mercury electrode.
Key words: Laser photoemission DMSO Methyl radical Organomercury intermediates.
Moscow University Chemistry Bulletin.
2013, Vol. 54, No. 6, P. 321
   

Copyright (C) Chemistry Dept., Moscow State University, 2002
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