Abstract
The technique of spin trapping with nitrone spin traps nas gained wide acceptance as a method for estimating·OH yields in ESR studies. In our study, fast optical kinetic techniques applied to a series of these traps (PBN, 2-PyBN, 3-PyBN, 4-PyBN, 3-PyOBN and 4-PyOBN) reveal relaxation spectra that indicate two absorption maxima with different time constants, with all except 4-PyOBN showing second order behavior. These two spectral regions show different kinetics. Thus, two reaction sites are indicated, only one of which is necessarily a measure of initial · OH when ESR methods are used. One other trap (DMPO) after · OH reaction decays in one mode suggesting that its final product might be useful as a measure of initial · OH. Also, our ESR evidence shows that OH detection can be improved significantly by spin trapping α-hydroxyalkyl radicals formed by · OH attack on alcohols.
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Sridhar, R., Beaumont, P.C. & Powers, E.L. Fast kinetics of the reactions of hydroxyl radicals with nitrone spin traps. Journal of Radioanalytical and Nuclear Chemistry, Articles 101, 227–237 (1986). https://doi.org/10.1007/BF02042423
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DOI: https://doi.org/10.1007/BF02042423