Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
A Phenomenological Description of Electron Paramagnetic Double-Resonance Relaxation of Organic Free Radicals in Solution. II. ENDOR Relaxation of Galvinoxyl
Hideo ShikataKazuhiko Ishizu
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1977 Volume 50 Issue 12 Pages 3090-3095


The ratio of the ENDOR enhancement to the ESR intensity (E) of galvinoxyl in toluene was measured under various conditions of microwave power, rf power and temperature. The results are discussed in comparison with a phenomenological theory in part I. It is proven that the apparent longitudinal electron spin relaxation time for a t-butyl proton under NMR excitation is about twice as long as those for methylidyne and ring protons, which is explained by the effect of incomplete hf separation. Also, it is shown that the reciprocal of the slope of the plot of E−1 vs. (rf power)−1 for methylidyne and ring protons is approximately proportional to the number of equivalent protons, whereas that for a t-butyl proton can be explained only if the effect of incomplete hf separation is taken into consideration. The value of b=WnWe for methylidyne and ring protons, simulated from the temperature dependence of E based on a previous theory, can be closely correlated to the spin distribution in galvinoxyl.

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