No abstract

Poly(p-tert-butyldimethoxydipropyloxycalix[4] arene--tetramethyldisiloxane) (TBCX-TMDS) and poly (dimethoxydipropyloxycalix[4]arene-tetramethyldisiloxane) (CX-TMDS), have been prepared and used as stationary phases for isothermal capillary gas chromatographic separations of positional isomers. Retention factors and separation factors for the isomers were measured. The isomers investigated were well-resolved on the two phases. Retention of all the solutes investigated is greater on TBCX-TMDS than on CX-TMDS, probably because of extra dispersive interactions of the solutes with the tert-butyl groups of the phase. Separation factors for closely-eluting isomer pairs are similar on the two phases. This seems to indicate either that the solutes are retained by non-inclusion processes or that if the isomer molecules do enter the cavity of the calixarene, i.e. the solute is retained by inclusion, the tertbutyl groups do not play a role in discriminating between the isomers.