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    Photoinduced Electron Transfer in Langmuir-Blodgett Monolayers of Porphyrin-Fullerene Dyads

    Year: 2005

    Journal: Langmuir 2005, 21, 5383-5390, 20111221

    Authors: Tommi Vuorinen, Kimmo Kaunisto, Nikolai V. Tkachenko, Alexander Efimov, Helge Lemmetyinen, Alexander S. Alekseev, Kohei Hosomizu and Hiroshi Imahori

    Organizations: aInstitute of Materials Chemistry, Tampere University of Technology, P.O. Box 541, 33101 Tampere, Finland bGeneral Physics Institute, Russian Academy of Science, Vavilov st. 38, 117942 Moscow, Russia cDepartment of Molecular Engineering, Graduate School of Engineering, Kyoto University, PRESTO, Japan Science and Technology Agency (JST), Katsura, Nishikyo-ku, Kyoto 615-8510, Japan

    A series of electron donor-acceptor (DA) dyads, composed of a porphyrin donor and a fullerene acceptor covalently linked with two molecular chains, were used to fabricate solid molecular films with the Langmuir-Blodgett (LB) technique. By means of the LB technique, the DA molecules can be oriented perpendicular to the plane of the substrate. In DHD6ee and its zinc derivative hydrophilic groups are attached to the phenyl moieties in the porphyrin end of the molecule; while in the other three dyads, TBD6a, TBD6hp, and TBD4hp, the hydrophilic groups are in the fullerene end of the molecule. This makes it possible to alternate the orientation of the molecules in two opposite directions with respect to the air-water interface and to fabricate molecular assemblies in which the direction of the primary photoinduced vectorial electron transfer can be controlled both by the deposition direction of the LB monolayer and by the selection of the used DA molecule. This was proved by the time-resolved Maxwell displacement charge measurements. The spectroscopic properties of theDAfilms were studied with the steady-state absorption and fluorescence methods. In addition, the time correlated single photon counting technique was used to determine the fluorescence properties of the dyad films.