Thin-layer ligand-exchange chromatographic separation

Such cases can be encountered in the case of thin-layer chromatographic separation of amino acids, using copper complexes of long chain amino acids as chiral additives via a ligand exchange approach. The copper complexes of alkyl amino acid chiral additives are so strongly adsorbed on the RP stationary phase that they act as a chiral stationary phase [154-156]. 

Gunther, K., Martens, J. and Schickedanz, M., Thin layer chromatographic enantiomer separation by using ligand exchange, Angew. Chem., 96, 514—515, 1984. 

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