The characteristic charge-transfer absorption frequencies of a number of I2-hydrocarbon complexes in carbon tetrachloride solution have been found to follow the relation hv = ID - EA - Δ, and the stabilization energy Δ was constant for the whole series and was equal to 3.256 eV. Except the calculated values of molar extinction coefficients of the complexes, most of the experimental results appeared to support the general conclusion derived from Mulliken's theory of intermolecular charge transfer interaction. The experimental data, however, suggest that the extinction coefficients may not be dependent on the nature of the hydrocarbon part of the complex.