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Two novel types of substituted cyclam-capped β-cyclodex- trin(β-CD)- bonded silica particles have been prepared and used as chiral stationary phases in capillary electro- chromatography(CEC).The two stationary phases have a chiral selector with three recognition sites:β-CD, cyclam,and the latter’s sidearm.They exhibit excellent enantioselectivities in CEC for a wider ange of compounds as a result of the cooperative functioning of the anchored β-CD and cyclam.After inclusion of the metal ion(Ni ) from the running buffer into the substituted cyclams and their sidearm ligands,the bonded stationary phases become positively charged and can provide extra electro- static interactions with ionizable solutes and enhance the dipolar interactions with some polar neutral solutes.This enhances the host-guest interaction with somesolutes and improves chiral recognition and enantioselectivity. These new types of stationary phases exhibit great poten- tial for fast chiral separations in CEC. |
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