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

Authors
Celalyan-Berthier, Alice
Rajalakshmi, Natarajan
Reddy, Malledi V. V. S.
Published in Radiation Physics and Chemistry. 1991, vol. 38, no. 6, p. 519-522
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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Research group Groupe Geoffroy
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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. https://archive-ouverte.unige.ch/unige:3048

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Deposited on : 2009-09-21

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