C70 vs. 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

C₇₀ vs. 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

Department of Chemistry & Nanoscience

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

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.

Original language	English
Pages (from-to)	251-258
Number of pages	8
Journal	Photochemical and Photobiological Sciences
Volume	2
Issue number	3
DOIs	https://doi.org/10.1039/b210127k
State	Published - Mar 2003

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title = "C70 vs. C60 in zinc porphyrin-fullerene dyads: Prolonged charge separation and ultrafast energy transfer from the second excited singlet state of porphyrin",

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.",

author = "Tero Kesti and Nikolai Tkachenko and Hiroko Yamada and Hiroshi Imahori and Shunichi Fukuzumi and Helge Lemmetyinen",

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T1 - C70 vs. C60 in zinc porphyrin-fullerene dyads

T2 - Prolonged charge separation and ultrafast energy transfer from the second excited singlet state of porphyrin

AU - Kesti, Tero

AU - Tkachenko, Nikolai

AU - Yamada, Hiroko

AU - Imahori, Hiroshi

AU - Fukuzumi, Shunichi

AU - Lemmetyinen, Helge

PY - 2003/3

Y1 - 2003/3

N2 - 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.

AB - 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.

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DO - 10.1039/b210127k

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ER -

C70 vs. C60 in zinc porphyrin-fullerene dyads: Prolonged charge separation and ultrafast energy transfer from the second excited singlet state of porphyrin

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C₇₀ vs. C₆₀ in zinc porphyrin-fullerene dyads: Prolonged charge separation and ultrafast energy transfer from the second excited singlet state of porphyrin