The molecular dynamics of peroxy radicals generated from several amides have been investigated as a function of temperature by ESR using a modified Bloch formalism. Rotation about the C-0 bond was found to be a mode of motion common to the peroxy radicals in the amides studied thus far. In the linear amides, we have also obtained preliminary evidence for rotation about the chain axis leading to inversion of the parallel and perpendicular principal g values. The frequence of motion at a given temperature decreases with increasing molecular size and with branching. The mobility parameters correlate reasonably well with the previously reported kinetics of post irradiation oxidation in the amides.
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