Electron spin resonance of irradiated single crystals of uracil

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Abstract
The radicals induced by X-irradiation at 300 K of single crystals of uracil have been analysed by E.S.R. spectroscopy. Immediately after irradiation, three radicals are detected: one hydrogen abstraction and two hydrogen addition radicals. The hydrogen abstraction is from N1 and the hydrogen addition occurs at position C5 and at position O4. Upon subsequent illumination with light of wavelength λ > 400 nm, the C5-addition radical transforms into C6-addition where the added hydrogen atom is localized on carbon C6. As in ohter pyrimidines, the β-proton splitting of the C5-addition radical is much smaller than that of the C6-addition radical (35·5 G instead of 48·0 G).

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