Pulsed and cw-time-resolved EPR studies of photoinduced electron transfer between zinc(II) porphyrin and fullerene

Jun Ichi Fujisawa; Yasunori Ohba; Seigo Yamauchi

doi:10.1016/S0009-2614(98)00855-0

Pulsed and cw-time-resolved EPR studies of photoinduced electron transfer between zinc(II) porphyrin and fullerene

Jun Ichi Fujisawa, Yasunori Ohba, Seigo Yamauchi

Division of Measurements

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

24 Citations (Scopus)

Abstract

Photoinduced electron and energy transfers between ZnTPP-d₂₀ (TPP; tetraphenylporphyrin) and fullerene (C₆₀) were studied in benzonitrile solution at room temperature by means of pulsed-Fourier transform and cw-time-resolved EPR. Two kinds of EPR signals were observed with absorptive spin polarizations and assigned to those of the ZnTPP-d₂₀ cation radical (ZnTPP⁺) and the lowest excited triplet state of C₆₀. Quantitative analysis of the time-evolution of the ³C₆₀ and ZnTPP⁺ signals demonstrates that electron transfer occurs from ³ZnTPP to C₆₀ and ZnTPP to ³C₆₀ and triplet-triplet energy transfer from ³ZnTPP to C₆₀. The induced absorptive polarizations of the ³C₆₀ and ZnTPP⁺ signals are explained by electron spin polarization transfer.

Original language	English
Pages (from-to)	248-254
Number of pages	7
Journal	Chemical Physics Letters
Volume	294
Issue number	1-3
DOIs	https://doi.org/10.1016/S0009-2614(98)00855-0
Publication status	Published - 1998 Sep 11

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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title = "Pulsed and cw-time-resolved EPR studies of photoinduced electron transfer between zinc(II) porphyrin and fullerene",

abstract = "Photoinduced electron and energy transfers between ZnTPP-d20 (TPP; tetraphenylporphyrin) and fullerene (C60) were studied in benzonitrile solution at room temperature by means of pulsed-Fourier transform and cw-time-resolved EPR. Two kinds of EPR signals were observed with absorptive spin polarizations and assigned to those of the ZnTPP-d20 cation radical (ZnTPP+) and the lowest excited triplet state of C60. Quantitative analysis of the time-evolution of the 3C60 and ZnTPP+ signals demonstrates that electron transfer occurs from 3ZnTPP to C60 and ZnTPP to 3C60 and triplet-triplet energy transfer from 3ZnTPP to C60. The induced absorptive polarizations of the 3C60 and ZnTPP+ signals are explained by electron spin polarization transfer.",

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AU - Fujisawa, Jun Ichi

AU - Ohba, Yasunori

AU - Yamauchi, Seigo

PY - 1998/9/11

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N2 - Photoinduced electron and energy transfers between ZnTPP-d20 (TPP; tetraphenylporphyrin) and fullerene (C60) were studied in benzonitrile solution at room temperature by means of pulsed-Fourier transform and cw-time-resolved EPR. Two kinds of EPR signals were observed with absorptive spin polarizations and assigned to those of the ZnTPP-d20 cation radical (ZnTPP+) and the lowest excited triplet state of C60. Quantitative analysis of the time-evolution of the 3C60 and ZnTPP+ signals demonstrates that electron transfer occurs from 3ZnTPP to C60 and ZnTPP to 3C60 and triplet-triplet energy transfer from 3ZnTPP to C60. The induced absorptive polarizations of the 3C60 and ZnTPP+ signals are explained by electron spin polarization transfer.

AB - Photoinduced electron and energy transfers between ZnTPP-d20 (TPP; tetraphenylporphyrin) and fullerene (C60) were studied in benzonitrile solution at room temperature by means of pulsed-Fourier transform and cw-time-resolved EPR. Two kinds of EPR signals were observed with absorptive spin polarizations and assigned to those of the ZnTPP-d20 cation radical (ZnTPP+) and the lowest excited triplet state of C60. Quantitative analysis of the time-evolution of the 3C60 and ZnTPP+ signals demonstrates that electron transfer occurs from 3ZnTPP to C60 and ZnTPP to 3C60 and triplet-triplet energy transfer from 3ZnTPP to C60. The induced absorptive polarizations of the 3C60 and ZnTPP+ signals are explained by electron spin polarization transfer.

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