Time-resolved spectroscopic study on photoinduced electron-transfer processes in ZN(II)porphyrin-ZN(II)chlorin-fullerene triad

Jeong Hyon Ha, Hyun Sun Cho, Dongho Kim, Jong Cheol Lee, Tae Young Kim, Young Key Shim

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Femtosecond time-resolved transient absorption studies have been performed to investigate the photoinduced energy and electron-transfer processes in Zn(II)porphyrin - Zn(II)chlorin - fullerene triad in which energy and oxidation potential gradients are directed along the donor - acceptor-linked arrays. Fast energy transfer (≈ 450 fs) from photoexcited Zn(II)porphyrin to Zn(II) chlorin was observed upon selective photoexcitation of Zn(II)porphyrin unit in the triad. In a nonpolar solvent such as toluene, the energy transfer from the excited singlet state of Zn(II)chlorin to fullerene occurs and is followed by the formation of an intermediate state with a time constant of nanoseconds, which was attributed to the intramolecular exciplex between Zn(II)chlorin and fullerene. In benzonitrile, On the other hand, the photoexcitation of the triad results in the fast electron transfer (< 1 ps) from photoexcited Zn(II)chlorin to fullerene. The generated charge-separated species recombine with a time constant of ≈ 12 ps. The relatively fast charge separation and charge recombination rates imply that the strong electronic coupling between Zn(II)chlorin and fullerene moieties is probably induced by the folded conformatiOn between Zn(II)chlorin and fullerene moieties which enhances direct through-space interaction between the proximately contracted π systems.

Original languageEnglish
Pages (from-to)951-958
Number of pages8
JournalChemPhysChem
Volume4
Issue number9
DOIs
Publication statusPublished - 2003 Sep 1

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Fullerenes
Porphyrins
porphyrins
fullerenes
electron transfer
Electrons
energy transfer
photoexcitation
Photoexcitation
time constant
Energy transfer
potential gradients
polarization (charge separation)
Toluene
toluene
chlorin
Excited states
Conformations
oxidation
Oxidation

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

Cite this

Ha, Jeong Hyon ; Cho, Hyun Sun ; Kim, Dongho ; Lee, Jong Cheol ; Kim, Tae Young ; Shim, Young Key. / Time-resolved spectroscopic study on photoinduced electron-transfer processes in ZN(II)porphyrin-ZN(II)chlorin-fullerene triad. In: ChemPhysChem. 2003 ; Vol. 4, No. 9. pp. 951-958.
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abstract = "Femtosecond time-resolved transient absorption studies have been performed to investigate the photoinduced energy and electron-transfer processes in Zn(II)porphyrin - Zn(II)chlorin - fullerene triad in which energy and oxidation potential gradients are directed along the donor - acceptor-linked arrays. Fast energy transfer (≈ 450 fs) from photoexcited Zn(II)porphyrin to Zn(II) chlorin was observed upon selective photoexcitation of Zn(II)porphyrin unit in the triad. In a nonpolar solvent such as toluene, the energy transfer from the excited singlet state of Zn(II)chlorin to fullerene occurs and is followed by the formation of an intermediate state with a time constant of nanoseconds, which was attributed to the intramolecular exciplex between Zn(II)chlorin and fullerene. In benzonitrile, On the other hand, the photoexcitation of the triad results in the fast electron transfer (< 1 ps) from photoexcited Zn(II)chlorin to fullerene. The generated charge-separated species recombine with a time constant of ≈ 12 ps. The relatively fast charge separation and charge recombination rates imply that the strong electronic coupling between Zn(II)chlorin and fullerene moieties is probably induced by the folded conformatiOn between Zn(II)chlorin and fullerene moieties which enhances direct through-space interaction between the proximately contracted π systems.",
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Time-resolved spectroscopic study on photoinduced electron-transfer processes in ZN(II)porphyrin-ZN(II)chlorin-fullerene triad. / Ha, Jeong Hyon; Cho, Hyun Sun; Kim, Dongho; Lee, Jong Cheol; Kim, Tae Young; Shim, Young Key.

In: ChemPhysChem, Vol. 4, No. 9, 01.09.2003, p. 951-958.

Research output: Contribution to journalArticle

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T1 - Time-resolved spectroscopic study on photoinduced electron-transfer processes in ZN(II)porphyrin-ZN(II)chlorin-fullerene triad

AU - Ha, Jeong Hyon

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AU - Lee, Jong Cheol

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AU - Shim, Young Key

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AB - Femtosecond time-resolved transient absorption studies have been performed to investigate the photoinduced energy and electron-transfer processes in Zn(II)porphyrin - Zn(II)chlorin - fullerene triad in which energy and oxidation potential gradients are directed along the donor - acceptor-linked arrays. Fast energy transfer (≈ 450 fs) from photoexcited Zn(II)porphyrin to Zn(II) chlorin was observed upon selective photoexcitation of Zn(II)porphyrin unit in the triad. In a nonpolar solvent such as toluene, the energy transfer from the excited singlet state of Zn(II)chlorin to fullerene occurs and is followed by the formation of an intermediate state with a time constant of nanoseconds, which was attributed to the intramolecular exciplex between Zn(II)chlorin and fullerene. In benzonitrile, On the other hand, the photoexcitation of the triad results in the fast electron transfer (< 1 ps) from photoexcited Zn(II)chlorin to fullerene. The generated charge-separated species recombine with a time constant of ≈ 12 ps. The relatively fast charge separation and charge recombination rates imply that the strong electronic coupling between Zn(II)chlorin and fullerene moieties is probably induced by the folded conformatiOn between Zn(II)chlorin and fullerene moieties which enhances direct through-space interaction between the proximately contracted π systems.

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