Charge-transfer interactions between nucleophilic compounds and chromatographic packings containing chemically bonded Cu(II) complexes

Results are presented of studies of packings containing copper(II) acetylacetonate (acac), hexafluoroacetylacetonate (hfac), and chloride, chemically bonded via beta-diketonate groups. The retention parameters retention factor (k), specific retention volume (V-g), and molecular retention index (M-e) were measured and used to calculate the thermodynamic parameters free energy of adsorption (Delta G(a)), heat of adsorption (-Delta H-a), and entropy of adsorption (Delta S-a). These parameters enable characterization of specific interactions between aromatic and cyclic hydrocarbons, ethers and thioethers and metal complexes chemically bonded to a silica surface.