Abstract
IN recent years a number of free radicals trapped in irradiated solids have been identified from their electron-spin resonance spectra. In particular, radicals of the form XHĊCO2H or XHĊCO2 − are known with X = CH3 (ref. 1), NH3 + (ref. 2), OH (ref. 3), CO2H (ref. 4), Cl (Pooley, D., and Whiffen, D. H., unpublished work), CH2CO2H (ref. 5), and CH2.CH2CO2H (unpublished work by A. H., J. R. M. and D. H. W.). Hitherto, however, the parent radical ·CH2(CO2H) has remained unidentified. This radical has now been identified in γ-irradiated malonic acid, CH2(CO2H)2. McConnell et al. 4 have fully investigated the radical ĊH(CO2H)2 which is also formed when malonic acid is γ-irradiated; they reported that lines not due to ·CH(CO2H)2 appeared in the spectra of freshly irradiated crystals, and could be removed by heating the crystals to 50° C. for 24 hr.
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References
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HORSFIELD, A., MORTON, J. & WHIFFEN, D. Identification of the Radical ·CH2(CO2H). Nature 189, 481 (1961). https://doi.org/10.1038/189481a0
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DOI: https://doi.org/10.1038/189481a0
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