Electron spin resonance studies of oxamic acid single crystals x-irradiated at 77 K

Leon L Finch; Don A Hampton; Grace C Moulton

Journal of Magnetic Resonance 18(2): 248-253


ISSN/ISBN: 1090-7807
DOI: 10.1016/0022-2364(75)90123-7
Accession: 061198433

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When single crystals of oxamic acid are irradiated at 77 K, at least three radical species are trapped at that temperature: an intense broad singlet that is identified as the anion radical, a very weak doublet identified as a radical pair, and another radical that is probably the cation radical or its decay product. When the crystal is warmed to room temperature, the Esr spectra change. Two singlets with very similar g tensors but different eigenvectors are observed at room temperature. The two singlets are probably produced at the different ends of the molecules by loss of water and ammonia, respectively.