2002 Fiscal Year Final Research Report Summary
Photoinduced Electron Transfer in Donor-linked Fullerenes
| Project/Area Number |
13440190
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Organic chemistry
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| Research Institution | KYOTO UNIVERSITY (2002)
Osaka University (2001) |
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Principal Investigator |
IMAHORI Hiroshi Graduate School of Engineering, Professor, 工学研究科, 教授 (90243261)
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| Project Period (FY) |
2001 – 2002
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| Keywords | Photosynthesis / Electron Transfer / Porphyrins / Fullerenes / Ferrocenes / Transient Absorption Spectroscopy / meso, meso-Linked Porphyrins / Donor-Acceptor Linked Systems |
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| Research Abstract |
We have prepared ferrocene-porphyrin dimer-fullerene triad where meso, meso-linked porphyrindimer is incorporated successfully into a charge separation unit as photosynthetic multistep electron transfer model for the first time. The triad reveals photoinduced electron transfer from the porphyrin dimer excited singlet state to the C_<60>, followed by charge-shift from the ferrocene to the porphyrin dimer radical cation, to produce the ferricenium ion-C<60> radical ion pair with a high quantum yield (0.71-0.88) as well as a long-lived charge-separated lifetime (16-83 μs) depending on the solvent. It should be emphasized here that the charge-separated lifetime of the present triad has been prolonged by replacing porphyrin monomer with porphyrin dimer without reducing the quantum yield significantly. The charge-separated lifetime is governed by stepwise charge recombination rather than direct charge recombination.
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