Hydrogen donor ability of pitch and e.s.r. characterization of iodine complexes

This study examines properties of pitches by complexing molecular constituents with iodine and relating e.s.r. data with hydrogen donor ability and X-ray analyses. Spin concentrations were measured for the parent pitches and for complexes containing 10 wt% iodine. Hydrogen donor abilities were measured by formation of 9,10-dihydroanthracene from anthracene. Stacking relations between molecules were deduced from X-ray data. A correlation was found between the hydrogen donor of the pitches and the ratio of spin concentration in the complexes and the parent pitch.