Solvent effect on the thermodynamic and spectrophotometric properties of charge transfer complexes—I

Abstract

The thermodynamic and spectrophotometric properties of the hexamethylbenzene-iodine charge transfer complex in different solvents such as cyclohexane, methylcyclohexane, n-heptane, carbon tetrachloride, 1,2-dichloroethane and benzene are found to depend on the solvent. The results show that the oscillator strengths of the charge transfer bands of the hexamethylbenzene-iodine complex in different solvents except benzene increase with the heats of formation in agreement with Mulliken's previous prediction. The role of the solvent in changing both thermodynamic as well as spectrophotometric properties of the complex is assumed to be due to the solvent interaction with iodine. An attempt is made to calculate the thermodynamic properties of the solvent-iodine interaction.