Energy and photoinduced electron transfer in a wheel-shaped artificial photosynthetic antenna-reaction center complex
Journal article, 2006

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.


G. Kodis

Y. Terazono

P. A. Liddell

Joakim Andreasson

Chalmers, Chemical and Biological Engineering, Physical Chemistry

V. Garg

M. Hambourger

T. A. Moore

A. L. Moore

D. Gust

Journal of the American Chemical Society

Vol. 128 6 1818-1827

Subject Categories

Chemical Sciences

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