Chemically responsive supramolecular assemblies of pyrene-beta-cyclodextrin dimer.
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.
Ogoshi
Tomoki
T
Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan. ogoshi@t.kanazawa-u.ac.jp
Hashizume
Masayoshi
M
Yamagishi
Tada-aki
TA
Nakamoto
Yoshiaki
Y
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*
C525966:1-phenylethynylpyrene; D005456:Fluorescent Dyes; D011721:Pyrenes; D047392:beta-Cyclodextrins; C549282:pyrene-beta-cyclodextrin; D014867:Water