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  • Title: Exhaustively methylated azacalix[4]arene: preparation, conformation, and crystal structure with exclusively CH/pi-controlled crystal architecture.
    Author: Tsue H, Ishibashi K, Takahashi H, Tamura R.
    Journal: Org Lett; 2005 May 26; 7(11):2165-8. PubMed ID: 15901160.
    Abstract:
    [structure: see text]. Described are the preparation, conformation, and crystal structure of exhaustively methylated azacalix[4]arene involving nitrogen atoms as bridging units. NMR and X-ray crystallographic analysis have demonstrated that this novel azacalix[4]arene adopts a 1,3-alternate conformation both in solution and in the solid state. The crystal structure has been characterized solely by intermolecular CH/pi interactions, by which the azacalix[4]arenes mutually interact with each other outside the cavity to furnish a two-dimensional network structure.
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