FORMATION ENTHALPIES AND NONBONDING INTERACTIONS OF HEXACHLOROCYCLOHEXANES

The enthalpies of combustion of alpha-, beta-, gamma- and delta-1,2,3, 4,5,6-hexachlorocyclohexane (HCCH) isomers and of chlorocyclohexane (C CH), and the enthalpy of vaporization of CCH have been determined by p recision combustion and vaporization calorimetry; the enthalpies of fo rmation of these compounds are derived. These results are more reliabl e than values reported in the literature. The non-bonding interactions in these molecules are discussed using the group scheme, the electros tatic bond energy model and force field calculations.