The noncovalent linking of Pirkle's dinitrobenzoyl-l-leucine chiral selector to unmodified silica gel by means of polar moieties such as amines and quaternary ammonium ions was studied. Selectors linked with amine groups provided resolution of racemic 2,2,2-trifluoro-1-(9-anthryl)ethanol comparable to that of Pirkle's column having a covalently bonded selector. Non-covalent linking by means of the quaternary ammonium ion group was much less efficient in resolving optical isomers.