Aqueous solutions of sodium p-sulfonatocalix[4]arene, 18-crown-6 and lanthanum(III) trichloride at pH 2.5 afford the ‘ferris wheel’ type supercation: [{Ln3+⊂(18-crown-6)(OH2)3}∩{(p-sulfonatocalix[4]arene4– + 2H+)}]+ isolated as the chloride with numerous waters of crystallisation.
A. Drljaca, M. J. Hardie, C. L. Raston, H. R. Webb and J. A. Johnson, Chem. Commun., 1999, 1135 DOI: 10.1039/A902095K
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