title: Neutralization of a sec-ammonium group unusually stabilized by the "rotaxane effect": synthesis, structure, and dynamic nature of a "free" sec-amine/crown ether-type rotaxane.
authors.affiliation: Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Ookayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan.
authors.forename: Kazuko
authors.initials: K
authors.lastname: Nakazono
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Takata