Energy and photoinduced electron transfer in porphyrin-fullerene dyads

Darius Kuciauskas, Su Lin, Gilbert R. Seely, Ana L Moore, Thomas A Moore, John Devens Gust, Tatiana Drovetskaya, Christopher A. Reed, Peter D W Boyd

Research output: Contribution to journalArticle

317 Citations (Scopus)

Abstract

Time-resolved fluorescence and absorption techniques have been used to investigate energy and photoinduced electron transfer in a covalently linked free-base porphyrin - fullerene dyad and its zinc analog. In toluene, the porphyrin first excited singlet states decay in about 20 ps by singlet - singlet energy transfer to the fullerene. The fullerene first excited singlet state is not quenched and undergoes intersystem crossing to the triplet, which exists in equilibrium with the porphyrin triplet state. In benzonitrile, photoinduced electron transfer from the porphyrin first excited singlet state to the fullerene competes with energy transfer. The fullerene excited singlet state is also quenched by electron transfer from the porphyrin. Overall, the charge-separated state is produced with a quantum yield approaching unity. This state lives for 290 ps in the free-base dyad and 50 ps in the zinc analog. These long lifetimes suggest that such dyads may be useful as components of more complex light-harvesting systems.

Original languageEnglish
Pages (from-to)15926-15932
Number of pages7
JournalJournal of Physical Chemistry
Volume100
Issue number39
Publication statusPublished - 1996

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Fullerenes
Porphyrins
porphyrins
fullerenes
electron transfer
Excited states
Electrons
Energy transfer
excitation
Zinc
zinc
energy transfer
energy
analogs
Toluene
Quantum yield
atomic energy levels
toluene
unity
Fluorescence

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Energy and photoinduced electron transfer in porphyrin-fullerene dyads. / Kuciauskas, Darius; Lin, Su; Seely, Gilbert R.; Moore, Ana L; Moore, Thomas A; Gust, John Devens; Drovetskaya, Tatiana; Reed, Christopher A.; Boyd, Peter D W.

In: Journal of Physical Chemistry, Vol. 100, No. 39, 1996, p. 15926-15932.

Research output: Contribution to journalArticle

Kuciauskas, D, Lin, S, Seely, GR, Moore, AL, Moore, TA, Gust, JD, Drovetskaya, T, Reed, CA & Boyd, PDW 1996, 'Energy and photoinduced electron transfer in porphyrin-fullerene dyads', Journal of Physical Chemistry, vol. 100, no. 39, pp. 15926-15932.
Kuciauskas, Darius ; Lin, Su ; Seely, Gilbert R. ; Moore, Ana L ; Moore, Thomas A ; Gust, John Devens ; Drovetskaya, Tatiana ; Reed, Christopher A. ; Boyd, Peter D W. / Energy and photoinduced electron transfer in porphyrin-fullerene dyads. In: Journal of Physical Chemistry. 1996 ; Vol. 100, No. 39. pp. 15926-15932.
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AU - Gust, John Devens

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AU - Reed, Christopher A.

AU - Boyd, Peter D W

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AB - Time-resolved fluorescence and absorption techniques have been used to investigate energy and photoinduced electron transfer in a covalently linked free-base porphyrin - fullerene dyad and its zinc analog. In toluene, the porphyrin first excited singlet states decay in about 20 ps by singlet - singlet energy transfer to the fullerene. The fullerene first excited singlet state is not quenched and undergoes intersystem crossing to the triplet, which exists in equilibrium with the porphyrin triplet state. In benzonitrile, photoinduced electron transfer from the porphyrin first excited singlet state to the fullerene competes with energy transfer. The fullerene excited singlet state is also quenched by electron transfer from the porphyrin. Overall, the charge-separated state is produced with a quantum yield approaching unity. This state lives for 290 ps in the free-base dyad and 50 ps in the zinc analog. These long lifetimes suggest that such dyads may be useful as components of more complex light-harvesting systems.

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