Thermochemistry of molecular complexes. 4. Molecular complexes of I2 with chloromethylbenzenes

The enthalpy of formation for twelve molecular complexes of I₂ with chloromethylbenzene molecules in CCl₄ have been determined. The wavelength of maximum absorption for each complex is also reported. The formation enthalpy for the complexes appears to depend strongly on the number and type of substituent groups attached to the benzene ring, but only weakly on the location of the substituent group on the ring. This suggests that it should be possible to predict formation enthalpies for a wide variety of complexes of this type based on a limited number of experimental measurements.