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ESR studies of γ-irradiated single crystals of succinic acid-d6 have enabled evaluation of 13C hyperfine splittings for the single line radical species. The data confirm the structure as HOOCCH2CH2C=O. Isotropic 13C hyperfine splittings of 131.8 and 47.7 G have been obtained for the carbonyl carbon and the adjacent methylene carbon. Spin density calculations show that the majority of the unpaired electron density is localized in the σ orbital arising from the rupture of a C–OH bond in the undamaged molecule.
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Yim et al. (1974) studied this question.
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