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    Porphyrin-fullerene dyad with a long linker: formation of charge transfer conformer in Langmuir-Blodgett film

    Year: 2002

    Journal: -, 20111221

    Authors: Nikolai V. Tkachenko , Visa Vehmanen , Juha-Pekka Nikkanen , Hiroko Yamada , Hiroshi Imahori , Shunichi Fukuzumi , Helge Lemmetyinen

    Organizations: a Institute of Materials Chemistry, Tampere University of Technology, P.O. Box 541, FIN-33101 Tampere, Finland b Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, PRESTO, JAPAN Science and Technology, Corporation (JST), Sakyo-ku, Kyoto 606-8501, Japan and Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4, Takano-Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan c Department of Material and Life Science, Graduate School of Engineering, Osaka University, CREST, JAPAN, Science and Technology Corporation (JST), Suita, Osaka 565-0871, Japan

    A porphyrin-fullerene covalently linked dyad is studied in solutions and Langmuir-Blodgett (LB) films. The dyad is characterized by a relatively long linker. In benzonitrile, it performs a relatively slow photo-induced electron transfer (ET), kET≈ 5 x 108 s-1. Being incorporated in an LB .lm the dyad forms a compact conformer, which takes the smallest surface area. For this conformer the donor-acceptor separation is much shorter as compared with that in liquid phases and the molecule perform a fast photo-induced ET, kET≈ 8 x 109 s-1. The LB films were studied using time-resolved measurements of .uorescence, absorption, and Maxwell displacement charge.