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Energy and photoind...
Energy and photoinduced electron transfer in a wheel-shaped artificial photosynthetic antenna-reaction center complex
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Kodis, G. (författare)
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Terazono, Y. (författare)
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Liddell, P. A. (författare)
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visa fler...
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- Andreasson, Joakim, 1973 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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Garg, V. (författare)
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Hambourger, M. (författare)
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Moore, T. A. (författare)
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Moore, A. L. (författare)
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Gust, D. (författare)
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visa färre...
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(creator_code:org_t)
- 2006
- 2006
- Engelska.
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Ingår i: Journal of the American Chemical Society. ; 128:6, s. 1818-1827
- Relaterad länk:
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https://research.cha...
Abstract
Ämnesord
Stäng
- Functional mimics of a photosynthetic antenna-reaction center complex comprising five bis(phenylethynyl)anthracene antenna moieties and a porphyrin-fullerene dyad organized by a central hexaphenylbenzene core have been prepared and studied spectroscopically. The molecules successfully integrate singlet-singlet energy transfer and photoinduced electron transfer. Energy transfer from the five antennas to the porphyrin occurs on the picosecond time scale with a quantum yield of 1.0. Comparisons with model compounds and theory suggest that the Foster mechanism plays a major role in the extremely rapid energy transfer, which occurs at rates comparable to those seen in some photosynthetic antenna systems. A through-bond, electron exchange mechanism also contributes. The porphyrin first excited singlet state donates an electron to the attached fullerene to yield a P.+-C-60(.-) charge-separated state, which has a lifetime of several nanoseconds. The quantum yield of charge separation based on light absorbed by the antenna chromophores is 80% for the free base molecule and 96% for the zinc analogue.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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