Abstract
The additivity principle is applied to the calculation of the enthalpic selectivity of the stationary phases in GLC. The experimental heat of solution is divided into the energy of the intermolecular interaction and the energy of the hole formation. The first is calculated using the dispersion interaction indices. They have been estimated for nonpolar systems using atomic refractions, van-der-Waals radii and coefficients of intramolecular shielding. The semiempirical factors for these calculations are estimated. The energy of the hole formation is measured experimentally. The calculated and experimental heats of solution for C6−C8 isoparaffins in squalane are compared. The standard deviation of the technique for such systems is about 0.2 kcal/mole.
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