Abstract
The chromatographic properties of three highly fluorinated stationary phases namely Fomblin YR [a poly(perfluoroalkyl) ether], PPF-20 [a poly(perfluorphenylene) ether], and Fluorad FC-430 [a fluoroalkyl ester], are compared with those of conventional phases. The importance of phase structure, coating solvent, and surface chemistry of the support for the preparation of efficient and stable column packings is outlined. The retention of solutes of different structures is shown to occur by a combination of gas—liquid partitioning and interfacial adsorption. The relative importance of partitioning compared to adsorption is influence by the degree of fluorination and the measurement temperature. From accurately determined gas—liquid partition coefficients, corrected McReynolds phase constants and partial molar free energies of solution for a methylene group (Δ G) were determined for the highly fluorinated phases. In the case of Fomblin YR, the very low value for Δ G(CH 2) compared to conventional phases provides a quantitative indication of the weak intermolecular forces operating in the chromatographic system. Higher values for PPF-20 indicate stronger dispersive interactions for the perfluroaromatic phase compared to the perfluoroalkyl phases.
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