THE EPR SPECTRA OF HALOGENATION PRODUCTS OF GASOLINE PYROLYSIS TAR

摘要

The method of EPR spectroscopy was used to study the effect of halogenation on the properties of asphaltenes of gasoline-pyrolysis tar. The following basic EPR signal characteristics were measured: the g-factor, the concentration of unpaired electrons and the relaxation times. It is shown that the increase of spin susceptibility upon halogenation is caused by the formation of π-electron radicals delocalized over aromatic fragments of asphaltenes isolated from gasoline-pyrolysis tar.