title: Chemically responsive supramolecular assemblies of pyrene-beta-cyclodextrin dimer.
abstract: We report supramolecular assemblies of a beta-cyclodextrin dimer linked at both ends of a fluorescent phenylethynylpyrene moiety (Py-beta-CD dimer). The Py-beta-CD dimer formed supramolecular associations in aqueous media due to the pi-pi stacking of the hydrophobic phenylethynylpyrene moiety. From tapping mode atomic force microscopy measurements, the Py-beta-CD dimer formed wire-shaped assemblies in aqueous media. By adding sodium adamantane carboxylate to the supramolecular assemblies, the structural change to J-type assemblies was observed. In contrast, upon addition of the electron-deficient guest, the electron transfer from the electron rich phenylethynylpyrene moiety of the supramolecular assemblies to the electron-deficient guest took place.
authors.affiliation: Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan. ogoshi@t.kanazawa-u.ac.jp
authors.forename: Tomoki
authors.initials: T
authors.lastname: Ogoshi
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Hashizume
authors.forename: Tada-aki
authors.initials: TA
authors.lastname: Yamagishi
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Nakamoto
mesh_terms: D019281:Dimerization; D004563:Electrochemistry; D004583:Electrons; D005456:Fluorescent Dyes / Q000737:chemistry; D008958:Models, Molecular; D008968:Molecular Conformation; D011721:Pyrenes / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D014867:Water / Q000737:chemistry; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: C525966:1-phenylethynylpyrene; D005456:Fluorescent Dyes; D011721:Pyrenes; D047392:beta-Cyclodextrins; C549282:pyrene-beta-cyclodextrin; D014867:Water