Solvent effect on the charge-transfer absorption bands of iodine complexes with aromatic hydrocarbons

The charge-transfer absorption bands of iodine complexes with aromatic hydrocarbons such as benzene, toluene, xylenes (p-, o- and m-), mesitylene and hexamethylbenzene have been measured in different solvents and different values have been obtained in each set of the complexes. The charge-transfer energies of each complex are plotted against the refractive index function and inverse dielectric constant of the solvents separately and the extrapolated values obtained at unit refractive index or dielectric constant are considered to be the corresponding values of the complexes in the gas phase.