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Inclusion Networks of a Calix[5]arene-Based Exoditopic Receptor and Long-Chain Alkyldiammonium Ions

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posted on 30.10.2003, 00:00 by Domenico Garozzo, Giuseppe Gattuso, Franz H. Kohnke, Anna Notti, Sebastiano Pappalardo, Melchiorre F. Parisi, Ilenia Pisagatti, Andrew J. P. White, David J. Williams
Tail-to-tail connection of two cone calix[5]arene moieties by a rigid p-xylyl spacer affords the new exoditopic receptor 3 featuring two π-rich cavities (assembling cores) in a centrosymmetric divergent arrangement, as established by a single-crystal X-ray analysis. 1H NMR complexation studies of 3 with alkyldiammonium ions support the formation of discrete bis-endo-cavity complexes and/or capsular assemblies along a polymer chain (polycaps), according to the length of the connector.