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Magnetic susceptibility of organic stable radicals, DPPH and its solvent complexes has been measured. Susceptibility of solvent free DPPH shows a maximum at 11°K and is well fitted to the pair model (δ⁄k=17.64°K). DPPH·BZ has a χmax at 0.65°K but remains constant down to 0.1°K. DPPH·1/4CCl4 has two Weiss-constants: θHigh=−26.0°K and θLow=−0.3°K. Spin concentration of the last complex in low temperature range (below 4.2°K) is a half of that of high temperature range (above 30°K).
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Fujito et al. (1972) studied this question.
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