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The magnetic characteristics of a liquid crystalline nitroxide radical 2,5-dimethyl-2-pentadecyloxyphenyl-5-[4-(4-pentadecyloxybenzenecarbonyloxy) phenyl]pyrrolidine-1-oxide in solution and in solids were studied by EPR spectroscopy; the EPR spectra of the radical were found to be highly sensitive to orientation and structural changes of the matrix.
Antiferromagnetic interactions (|J|/k B > 4.0), which were observed by the magnetization measurement of the powder samples of the racemic nitroxyl radicals trans-2,5-bis(4-methylphenyl)-2,5-dimethylpyrrolidine-1-oxy [(±)-1a] and trans-2,5-bis(4-bromophenyl)-2,5-dimethylpyrrolidine-1-oxy [(±)-2a] at low temperatures, were rationalised in terms of the intermolecular spin polarization exchange...
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