An electron spin resonance study of radicals from chloramine-t-1 : Spin trapping of radicals produced in acid media |
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Authors: | Jeffrey C Evans Simon K Jackson Christopher C Rowlands Martin D Barratt |
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Institution: | Chemistry Department, University College, P.O. Box 78, Cardiff CF 1 1XL, U.K;Environmental Safety Laboratory, Unilever Research, Colworth House, Sharnbrook, BedfordU.K. |
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Abstract: | Under acid conditions aqueous solutions of chloramine-T form nitrogen-centred radicals via loss of the chlorine atom. The nitrogen radicals produced have been studied by ESR spectroscopy using the spintrapping method. Adducts of the spin trap phenyl-t-butyl nitrone are oxidized by chloramine-T in acid media to give a paramagnetic product in which the unpaired electron interacts with two inequivalent nitrogen atoms. The spin trap 5,5-dimethyl-2-pyrrolidine-1 -oxide is oxidized rapidly to 5,5-dimethyl-2-pyrrolidone-1-oxyl by chloramine-T under acid onditions. The water soluble trap α-4-pyridyl-1-oxide-N-t-butyl nitrone forms a stable nitroxide adduct with a nitrogen radical of chloramine-T in acid solution. Identical results were obtained with chloramine-B (sodium salt of N-chlorobenzene sulfonamide), indicating the involvement of the N-chloramine group in radical formation. |
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