화학공학소재연구정보센터
Chemistry Letters, Vol.33, No.7, 932-933, 2004
Characterization of the chiral paramagnetic multispin system built on a cyclotriphosphazene scaffold
Chiral nitroxide-cyclotriphosphazene hybrid compounds such as 2,2-dinitroxide (1a), 2,2,4,4-tetranitroxide (2a), and 2,2,4,4,6,6-hexanitroxide (3a) have been prepared to examine the potentiality for the use of the cyclotriphosphazene framework as a molecular scaffold for elaborating robust, chiral paramagnetic multispin systems. EPR spectroscopic studies of these compounds in solution and in frozen solvent matrixes indicate the existence of appreciable intramolecular electron-exchange interactions between two or three neighboring radical moieties disposed on the same side of the cyclotriphosphazene ring. Their bulk paramagnetic properties have also been characterized by magnetic susceptibility measurements.