Dynamic effects in ESR spectra of 4-triphenylmethyl-6-tert-butyl-2-hydroxyphenoxyl and 4-triphenylmethyl-6-phenyl-2-hydroxyphenoxyl

Abstract

In the ESR spectra of 6-triphenylmethyl-4-tert-butyl-2-hydroxyphenoxyl and 6-triphenylmethyl-4-phenyl-2-hydroxyphenoxyl and their deuterated analogs, temperature-dependent dynamic effects have been found; these are explained from the standpoint of a reversible intramolecular transition between different conformations of the radicals, differing in the spin density distribution, owing to direct interaction of the unpaired electron with the π orbitals of the phenyl rings of the triphenylmethyl substituent.