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Radical pair formation in a single crystal of bromonitrothiazole after x-irradiation at 77 K: an ESR study

Published inRadiation physics and chemistry, vol. 38, no. 6, p. 519-522
Publication date1991
Abstract

X-irradiation of a single crystal of bromonitrothiazole at 77 K leads to signals in both the g = 4 and the g = 2 regions of the ESR spectrum. The angular dependence of these signals is consistent with the formation of a radical pair which exhibits hyperfine structure with a 1H and 14N nucleus. This structure together with the electron-electron dipolar interaction shows that irradiation probably causes a scission of the bond between the nitrogen group and the thiazole ring. The resulting radicals are pair-wise trapped up to 170 K; at higher temperature the NO2 radical probably adds to a neighbouring undamaged molecule to form the azaallyl radical which is stable at room temperature.

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Citation (ISO format)
GEOFFROY, Michel et al. Radical pair formation in a single crystal of bromonitrothiazole after x-irradiation at 77 K: an ESR study. In: Radiation physics and chemistry, 1991, vol. 38, n° 6, p. 519–522. doi: 10.1016/1359-0197(91)90076-E
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ISSN of the journal0146-5724
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