AN ESR STUDY ON FORMATION OF IMINOXY FREE RADICALS-SOLVENT EFFECT ON HYPERFINE SPLITTING CONSTANTS

The solvent effect on hyperfine interaction in three different types of iminoxy radicals obtained by oxidation of di-2-pyridilketoxime (1), diethyl hydroxyimino(2-fluorophenyl)methanephosphonate (2) and isonitrosoacetophenone (3) have been analyzed. Linear correlations of hyperfine constants of N-14 (both iminoxyl and pyridyl nitrogens of the iminoxyl derived from 1), P-31 (isomer Z of the iminoxyl derived from 2) and F-19(both Z and E isomers of iminoxyls derived from 2) on E(T)(30) solvent polarity parameters have been found. Opposite directions of the dependencies for different nuclei of the same radical have been established. Anisotropic spectra of the radical derived from 1 and iminoxy radicals derived from alpha-furildioxime have been obtained by gamma-irradiation of solid oximes.