Electron spin resonance studies. Part XII. Characteristics of the iminoxy-radicals from the 1-halogenofluorenone oximes

Abstract

The hyperfine splittings of the halogen nuclei in the 1-halogenofluorenone iminoxy-radicals are remarkably large; they are discussed in terms of an interaction between the orbital of the unpaired electron on the iminoxy-function and one on the halogen which, though four bonds removed, is suitably sited by virtue of the fixed geometry of the system. The lines in the spectrum of the iodine-containing radical are markedly broadened, and their widths vary with the temperature and viscosity of the medium in a manner which indicates the operation of nuclear-quadrupole relaxation.