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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.
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Arena et al. (1996) studied this question.
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