Polarizable polysiloxane stationary phases for capillary column gas chromatography

Abstract

Polysiloxane polymers, containing polarizable biphenyl, naphtyl and phenoxyphenyl side groups, were synthesized and evaluated for capillary column gas chromatography. Although the more polar cyanopropyl stationary phase demonstrated better resolution of components in a wide-polarity-range mixture, the polarizable phases demonstrated better resolution of polar isomers. The “softer” dipole—induced dipole interaction between the solute and stationary phase, as compared to the dipole—dipole interaction with a polar stationary phase, is more sensitive to slight molecular differences in isomeric structures. The biphenyl polysiloxane, on the whole, demonstrated the best selectivity in a number of isomer separations.