Abstract
The electron-spin relaxation times of four Cr(V) complexes have been measured by time-domain methods from 10 to 220 K for T 1 and from 80 to 220 K for T M. The magnitudes and temperature dependence of the relaxation times are more similar to those of simple organic radicals than those of transition metals. Specific comparison is made to the relaxation times of nitroxyl radicals. For the nitroxyl radical and three of the Cr(V) complexes, the temperature dependence of the phase memory time, T M, in 1:1 water: glycerol between 80 and 160 K is attributed to the effects of methyl group rotation. The activation energy for the methyl group rotation is 2 kcal/mol for the nitroxyl, 1.5 kcal/mol for a methyl group on the Cr(V) chelate ring, and 1.0 kcal / mol for the methyl of an ethyl group on the Cr(V) chelate ring.
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