Electron spin resonance studies of irradiated succinamic acid. II. Monoclinic single crystals

The radiation products and decay mechanisms have been studied in single crystals of monoclinic succinamic acid using electron spin resonance spectroscopy over the temperature range from 77° through 300°K. At 77°K the primary radical observed is the anion radical COOHCH2CH2(ĊONH2)− where the unpaired...

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Bibliographic Details
Published in:The Journal of chemical physics 1974-02, Vol.60 (4), p.1231-1235
Main Authors: Straw, David C., Moulton, Grace C.
Format: Article
Language:English
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Summary:The radiation products and decay mechanisms have been studied in single crystals of monoclinic succinamic acid using electron spin resonance spectroscopy over the temperature range from 77° through 300°K. At 77°K the primary radical observed is the anion radical COOHCH2CH2(ĊONH2)− where the unpaired electron is delocalized throughout the entire amide group. This radical decays at about 180°K to a nonparamagnetic species. The minor product at 77°K is the cation product and decays at about 157°K by intermolecular hydrogen abstraction to two radicals which are stable at room temperature, COOHĊHCH2CONH2, and COOHCH2ĊHCONH2. The spectra observed at 300°K are identical in crystals irradiated at 77°K and warmed to 300°K. The differences in the radiation products and mechanisms for the monoclinic and triclinic forms are discussed.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.1681187