It has been observed that when iodine concentration is high in a mixture of iodine and polynuclear aromatic hydrocarbon in carbon tetrachloride, the spectral data may be interpreted on the assumption of 2:1 molecular complex formation between iodine and aromatic hydrocarbon. The equilibrium constants for 2:1 complexes were, however, found to be much higher than those of the corresponding 1:1 complexes and they were further found to be independent of the nature of the hydrocarbon. Interpretation of the experimental data based on contact charge transfer appears to be much more reasonable in the present case.