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Photoinduced electron transfer in Langmuir-Blodgett monolayers of double-linked phthalocyanine-fullerene dyads

Lehtivuori, Heli and Kumpulainen, Tatu and Efimov, Alexander and Lemmetyinen, Helge and Kira, Aiko and Imahori, Hiroshi and Tkachenko, Nikolai V. (2008) Photoinduced electron transfer in Langmuir-Blodgett monolayers of double-linked phthalocyanine-fullerene dyads. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (26). pp. 9896-9902.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp8026918

Abstract

Photoinduced electron transfer (ET) in films of the double-linked free-base phthalocyanine-fullerene dyads (Pc-C-60) was studied in solid Langmuir-Blodgett (LB) films using femtosecond pump-probe and microsecond flash-photolysis methods. Excitation of the phthalocyanine (Pc) moiety of the dyad results in a rapid (0.8 ps) intramolecular ET from phthalocyanine to fullerene. The formed charge separated (CS) state relaxes in 35 ps, yielding an intermolecular CS state, which relaxes to the ground state in the microsecond time domain. The surface organization of the Pc-C-60 dyad monolayers was studied by atomic force microscopy for both pure Pc-C-60 films and Pc-C-60 mixed films with matrix molecules, octadecylamine (ODA). This study together with the estimations done based on surface pressure-mean molecular area isotherms reveals that the dyads tend to aggregate rather than form a homogeneous mixture with the ODA molecules. This enforces intermolecular interactions and leads to the formation of a long-lived intermolecular CS state.

Item Type:Article
Subjects:Analytical Science > Microscopy and probe methods
Material Science > Functional and hybrid materials
Material Science > Nanochemistry
ID Code:2863
Deposited By:Farnush Anwar
Deposited On:13 Jan 2009 16:23
Last Modified:27 Jan 2009 12:00

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