title: Dendritic [2]rotaxanes: synthesis, characterization, and properties.
abstract: A series of dendritic ammonium salts have been designed and synthesized. Subsequently, they were used to construct the corresponding [2]rotaxanes by a template-directed clipping approach. Unusually, two unsymmetrical dendritic [2]rotaxanes containing fluorophore (pyrene units) were also obtained; their optical properties, such as UV/vis absorption and fluorescence, were measured. The results indicate that these two rotaxanes possess stronger intermolecular interaction in the solid state than in solution. As a result, solutions of high concentration readily formed the excimer. These special rotaxanes might be applied in dynamic fluorescence-reponsive materials, and the rotaxane structure will also be used as a strategy to adjust the aggregated behaviors of fluorescent molecules.
authors.affiliation: Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University , Wuhan 430079, P.R. China.
authors.forename: Guoxing
authors.initials: G
authors.lastname: Liu
authors.forename: Ziyong
authors.initials: Z
authors.lastname: Li
authors.forename: Di
authors.initials: D
authors.lastname: Wu
authors.forename: Wen
authors.initials: W
authors.lastname: Xue
authors.forename: Tingting
authors.initials: T
authors.lastname: Li
authors.forename: Sheng Hua
authors.initials: SH
authors.lastname: Liu
authors.forename: Jun
authors.initials: J
authors.lastname: Yin
mesh_terms: D050091:Dendrimers / Q000138:chemical synthesis* / Q000737:chemistry*; D015394:Molecular Structure; D043862:Rotaxanes / Q000138:chemical synthesis* / Q000737:chemistry*
chemical_list: D050091:Dendrimers; D043862:Rotaxanes