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