ON THE STRUCTURE OF IODINE CHARGE-TRANSFER COMPLEXES IN SOLUTION

Femtosecond transient absorption studies of charge-transfer complexes of I, with hexamethylbenzene have been performed in a series of noncom plexing solvents. Anisotropy measurements of the bleach of the charge- transfer absorption band indicate that the geometry and electronic str ucture of the complex is dependent upon the solvent environment. The r esults are interpreted as favoring an oblique, nearly axial, geometry in alkanes and a resting geometry in chlorinated methanes.