title: Fluorescence control of boron enaminoketonate using a rotaxane shuttle.
abstract: The effect of rotaxane shuttling on the fluorescence properties of a fluorophore was investigated by exploiting fluorophore-tethered [2]rotaxanes. A fluorescent boron enaminoketonate (BEK) moiety was introduced in a rotaxane via transformation of an isoxazole unit generated as a result of an end-capping reaction using a nitrile N-oxide. The rotaxane exhibited a red shift of the fluorescence maximum along with a remarkable enhancement of the fluorescence quantum yield through wheel translation to the fluorophore.
authors.affiliation: Catalysis Research Center, Hokkaido University , N21 W10, Kita-ku, Sapporo 001-0021, Japan, Department of Organic and Polymeric Materials, Tokyo Institute of Technology , 2-12-1 (H-126), Ookayama, Meguro, Tokyo 152-8552, Japan, Department of Material Science and Technology, Faculty of Engineering, Niigata University , Igarashi 2-8050, Niigata 950-2181, Japan, and Department of Chemistry, Tokyo Institute of Technology , 2-12-1 (E1-9), Ookayama, Meguro, Tokyo 152-8551, Japan.
authors.forename: Yasuhito
authors.initials: Y
authors.lastname: Koyama
authors.forename: Tohru
authors.initials: T
authors.lastname: Matsumura
authors.forename: Tatsuto
authors.initials: T
authors.lastname: Yui
authors.forename: Osamu
authors.initials: O
authors.lastname: Ishitani
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Takata