title: Exhaustively methylated azacalix[4]arene: preparation, conformation, and crystal structure with exclusively CH/pi-controlled crystal architecture.
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.
authors.affiliation: Graduate School of Global Environmental Studies, Kyoto University, Kyoto 606-8501, Japan. tsue@ger.mbox.media.kyoto-u.ac.jp
authors.forename: Hirohito
authors.initials: H
authors.lastname: Tsue
authors.forename: Koichi
authors.initials: K
authors.lastname: Ishibashi
authors.forename: Hiroki
authors.initials: H
authors.lastname: Takahashi
authors.forename: Rui
authors.initials: R
authors.lastname: Tamura