Abstract
The intermolecular interactions responsible for the adsoprtion of solvents on alumina and silica are chracterized using the solvation parameter model. Both adsorbents retain solvents by strong hydrogen bond and dipole-type interactions. alumina is significantly more hydrogenbond basic and less hydrogen-bond acidic than silica, while both adsorbents are reasonably dipolar/polarizable. Increasing solvent size reduces polar adsorbent interactions. Models are presented that enable the solvent strength parameter, e° to be estimated for a wide range of solvents on alumina and silica to about 0.045 and 0.037 units, respectively. These models can be used to estimate from structure additional solvent strengh parameter values for useful liquid-solid chromatographic solvents that lack consensus experimental values.
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