C70vs. C60 in zinc porphyrin–fullerene dyads: prolonged charge separation and ultrafast energy transfer from the second excited singlet state of porphyrin

Tero Kesti; Nikolai Tkachenko; Hiroko Yamada; Hiroshi Imahori; Shunichi Fukuzumi; Helge Lemmetyinen

doi:10.1039/B210127K

C₇₀vs. C₆₀ in zinc porphyrin–fullerene dyads: prolonged charge separation and ultrafast energy transfer from the second excited singlet state of porphyrin†‡

Tero Kesti,*^a Nikolai Tkachenko,^a Hiroko Yamada,^b Hiroshi Imahori,*^cd Shunichi Fukuzumi*^b and Helge Lemmetyinen^a

* Corresponding authors

^a Institute of Materials Chemistry, Tampere University of Technology, P.O. Box 541, 33101 Tampere, Finland
E-mail: tero.kesti@iki.fi

^b Department of Material and Life Science, Graduate School of Engineering, Osaka University, CREST, Japan Science and Technology Corporation (JST), Suita, Osaka 565-0871, Japan
E-mail: fukuzumi@ap.chem.eng.osaka-u.ac.jp

^c Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, PRESTO, Japan Science and Technology Corporation (JST), Sakyo-ku, Kyoto 606-8501, Japan

^d Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4, Takano-Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan
E-mail: imahori@mee3.moleng.kyoto-u.ac.jp

Abstract

The second excited singlet (S₂) state of porphyrin was efficiently quenched by the attached fullerene C₇₀ moiety in a zinc porphyrin–C₇₀ dyad. The quenching is largely explained by energy transfer to C₇₀, but the possibility of additional reactions involving the S₂ state of porphyrin is discussed. Singlet energy transfer was found to be an important decay pathway also for the first excited singlet (S₁) state of porphyrin. In the polar solvent benzonitrile a charge-separated state was formed, and its lifetime was 890 ps, 50% longer than in the analogous porphyrin–C₆₀ dyad.

This article is part of the themed collection: In honour of Jean Kossanyi

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Article information

DOI: https://doi.org/10.1039/B210127K
Article type: Paper
Submitted: 17 Oct 2002
Accepted: 03 Dec 2002
First published: 04 Feb 2003

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Photochem. Photobiol. Sci., 2003,2, 251-258

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C₇₀vs. C₆₀ in zinc porphyrin–fullerene dyads: prolonged charge separation and ultrafast energy transfer from the second excited singlet state of porphyrin

T. Kesti, N. Tkachenko, H. Yamada, H. Imahori, S. Fukuzumi and H. Lemmetyinen, Photochem. Photobiol. Sci., 2003, 2, 251 DOI: 10.1039/B210127K

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Photochemical & Photobiological Sciences