title: Use of anions to allow translational isomerism of a [2]rotaxane.
abstract: We report a molecular [2]rotaxane which comprises a molecular cage and a dumbbell-shaped component, in which translational isomerism can be performed reversibly through an in situ anion exchange process, that is, sequential addition of Bu4NCl/AgPF6 reagent pairs. The [2]rotaxane incorporates two pyridinium and two dialkylammonium centers and functions as a triply operable molecular switch, which can be controlled through altering the polarity of the solvent, adding acidic and basic reagents (TFA/Et3N), and the varying the nature of the counteranions (Cl- vs PF6-).
authors.affiliation: Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, and Department of Medical Genetics, China Medical University Hospital, Taichung, Taiwan, ROC.
authors.forename: Chi-Feng
authors.initials: CF
authors.lastname: Lin
authors.forename: Chien-Chen
authors.initials: CC
authors.lastname: Lai
authors.forename: Yi-Hung
authors.initials: YH
authors.lastname: Liu
authors.forename: Shie-Ming
authors.initials: SM
authors.lastname: Peng
authors.forename: Sheng-Hsien
authors.initials: SH
authors.lastname: Chiu
mesh_terms: D000838:Anions / Q000737:chemistry*; D007536:Isomerism; D015394:Molecular Structure; D043862:Rotaxanes / Q000737:chemistry*
chemical_list: D000838:Anions; D043862:Rotaxanes