The effect of several photosensitizers on the formation of free radicals in cellulose has been investigated. Radicals were generated with ultraviolet light, and examined by means of ESR techniques; irradiations were carried out at 77°K. On irradiation of the sensitized celluloses with light of λ > 3400 Å, samples treated with benzoyl peroxide, hydrogen peroxide, benzophenone, riboflavin, azobisisobutylonitrile, and metallic ions Cr2+ and Ni2+ exhibited single‐line spectra with line widths of 16 to 26 gauss. Samples treated with Pb2+ and Fe3+ exhibited three‐line and five‐line spectra, respectively. On irradiation with light of λ > 2537 Å, most of the sensitized samples exhibited five‐line spectra with different relative signal intensities. Among these, samples treated with Fe3+ manifested the most prominent spectra with the strongest relative signal intensities.
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Nyok‐Sai Hon (1975) studied this question.
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