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