Preparation and study of two polysiloxanes with pendant hand-basket type calixarene stationary phases for capillary gas chromatography

In this study two novel pendant hand-basket type calixarene gas chromatography stationary phases were prepared by hydrosilylation of omega-undecenploxymethyl dimethyl calix[4]-15C5 and omega-undecenyloxymethyl dimethyl calix[4]-18C6 with dichloromethane followed by condensation reaction with silanol-terminated polydimethylsiloxane. important stationary phase properties of these two novel stationary phases such as column efficiency, polarity, and selectivity were examined and compared with those of omega-undecyloxymethyl-18-crown-6, 2,3-benzo-9-propyloxymethyl-15-crown-5 and 2,3-benzo-11-propyloxymethyl-18-crown-6. Excellent thermostability from 60 to 330 degrees C with onset bleeding temperatures at 308 degrees C have been found. The mechanism of specific selectivity for position isomers based on the calix[4]crown ether ring, the molecular size of the solute and its shape are discussed. (C) 1999 Elsevier Science B.V. All rights reserved.