Abstract
PREVIOUS applications of the method of paramagnetic resonance to the detection of labile free radicals have been restricted to those stabilized by permanent trapping in polymers1 or plastic films2 at room temperature or those produced by γ-irradiation3. Measurements have now been made on radicals formed photochemically by ultra-violet irradiation of solutions frozen at liquid-oxygen or nitrogen temperatures. The radicals can be preserved for some hours at the low temperature, but their high reactivity is demonstrated by the rapid disappearance of the paramagnetic resonance signal on warming. The method of trapping free radicals by photolysis in rigid glasses at liquid-nitrogen temperature has been described by Norman and Porter4, who used ultra-violet absorption spectroscopy to detect and identify the photochemical products. We have investigated several of the compounds used by Norman and Porter, and in addition we have demonstrated the production of free radicals in systems where they have not been previously observed.
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References
Fraenkel, G. K., Hirshon, J. M., and Walling, C., J. Amer. Chem. Soc., 76, 3606 (1954). Bamford, C. H., Jenkins, A. B., Ingram, D. J. E., and Symons, M. C. R., Nature, 175, 894 (1955).
Bijl, D., and Rose-Innes, A. C., Nature, 175, 82 (1955).
Matheson, M. S., and Smaller, B., J. Chem. Phys., 23, 521 (1955).
Norman, I., and Porter, G., Proc. Roy. Soc., A, 230, 399 (1955).
Parker, C. A., Trans. Farad. Soc., 50, 1213 (1954).
Parker, C. A., Proc. Roy. Soc., A, 220, 104 (1953), and unpublished work.
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INGRAM, D., HODGSON, W., PARKER, C. et al. Detection of Labile Photochemical Free Radicals by Paramagnetic Resonance. Nature 176, 1227–1228 (1955). https://doi.org/10.1038/1761227a0
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DOI: https://doi.org/10.1038/1761227a0
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