The powder susceptibilities of crystalline stable free radical samples of picryl-n-amino carbazyl, Wurster's blue, DPPH and 1,3-bisdiphenylene-2-phenyl allyl have been measured as a function of temperature from 77–293°K. All exhibit negative paramagnetic Curie points with values in the range —51° to —6°K. For Wurster's blue, the Néel temperature is found to be 186°K.
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William Duffy (1962) studied this question.
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