MAGNETIC-INTERACTIONS OF ORGANIC NITROXYL RADICAL AND BIRADICAL

The magnetic property of 3,17-bis(4,4-dimethyl-3-oxazolidine-1-oxyl)-5 alpha-androstane (OXZAN), in which two nitroxyl radicals were bonded to 5 alpha-androstane, was investigated by measurements of ESR spectra and magnetic susceptibility. ESR spectrum of the OXZAN is composed of 5-line which means that intramolecular exchange interaction take plac e with through-bond mechanism. No dilution effect on the line shape of the 5-line spectrum and observation of half-field transition support the mechanism. The measurement of magnetic susceptibility shows that m agnetic interaction is intermolecularly antiferromagnetic. yl-4-oxy)ph enyl-4'(6-acryloyloxy-hexyloxy)benzoate (TPOB) was prepared as vinyl m onomer with mesogen in which the formation of liquid crystalline was c onfirmed by observing birefringence under a polarizing microscope (x 6 00). The measurement of magnetic susceptibility shows that the magneti c interaction of this monomer is ferromagnetic.