Abstract
Abstract In a number of studies of the electron magnetic resonance spectra of donoracceptor charge transfer complexes,1–3 the temperature dependence of the absorption approximately follows the Curie Law, x ∼ 1/T at temperatures near that of liquid nitrogen. It is generally assumed that in this temperature region most of the absorption is of extrinsic origin. Indeed, Pott and Kommandeur4 showed that such effects could be produced in their samples by varying the method of preparation. The magnitudes of the absorption are outside the limits expected for impurities. Hughes and Soos5 have proposed that the low temperature absorption in p-phenylene diamine-chloranil is due to molecular chains of only finite length with an odd number of radicals. The purpose of this note is to report that in some samples of p-phenylene diamine-bromanil the number of spins appears to be constant over a wide range of temperature, from 77°K to 300°K and that the spins appear to be localized on bromanil radical ions.
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