New 1,3-alternate calix[4]arenecrown-6 and calix[4]arenecrown-5, which are selective for caesium and potassium ions respectively, have been synthesized and linked covalently to silica gel via hydrosilanization and successfully employed for the chromatographic separation of Cs+ and K+ from alkali metal ions.
G. Arena, A. Casnati, A. Contino, L. Mirone, D. Sciotto and R. Ungaro, Chem. Commun., 1996, 2277 DOI: 10.1039/CC9960002277
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