title: Fixed or invertible calixarene-based directional shuttles.
abstract: The first examples of rotaxanes based on calixarenes threaded by dialkylammonium ions, which also represent the first examples of calixarene-based molecular shuttles, are reported. The base/acid treatment demonstrated that these systems act as molecular shuttles, which move between three sites on the axle. When small OMe groups are appended at the calix[6]arene lower rim an unprecedented inversion of its shuttling direction is observed, which occurs through a cone-to-cone inversion of the macrocycle.
authors.affiliation: Dipartimento di Chimica e Biologia, Università di Salerno, Fisciano (Salerno), Italy.
authors.forename: Teresa
authors.initials: T
authors.lastname: Pierro
authors.forename: Carmine
authors.initials: C
authors.lastname: Gaeta
authors.forename: Carmen
authors.initials: C
authors.lastname: Talotta
authors.forename: Agostino
authors.initials: A
authors.lastname: Casapullo
authors.forename: Placido
authors.initials: P
authors.lastname: Neri
mesh_terms: D047250:Calixarenes / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D015394:Molecular Structure; D043862:Rotaxanes / Q000737:chemistry
chemical_list: D043862:Rotaxanes; D047250:Calixarenes