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

G. Kodis ; Y. Terazono ; P. A. Liddell ; Joakim Andréasson (Institutionen för kemi- och bioteknik, Fysikalisk kemi) ; V. Garg ; M. Hambourger ; T. A. Moore ; A. L. Moore ; D. Gust
Journal of the American Chemical Society Vol. 128 (2006), 6, p. 1818-1827.
[Artikel, refereegranskad vetenskaplig]

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.



Denna post skapades 2008-10-21. Senast ändrad 2011-11-03.
CPL Pubid: 75948

 

Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Fysikalisk kemi (2005-2014)

Ämnesområden

Kemi

Chalmers infrastruktur