Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
The Chemical Society of Japan Award for Young Chemists for 2006
Rational Design and Functions of Electron Donor–Acceptor Dyads with Much Longer Charge-Separated Lifetimes than Natural Photosynthetic Reaction Centers
Kei OhkuboShunichi Fukuzumi
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2009 Volume 82 Issue 3 Pages 303-315

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Abstract

The natural photosynthetic reaction center utilizes sequential multi-step electron transfer from the excited chromophore to the terminal electron acceptor via electron mediators to attain a long lifetime of the final charge-separated (CS) state. Contrary to natural systems, simple electron donor–acceptor dyads have been developed to attain a long-lived CS state, where the donor and acceptor molecules are linked with a short spacer. In the case of a directly linked zinc chlorin–fullerene dyad, the lifetime of the CS state at −150 °C is as long as 120 s. This value is the longest CS lifetime ever reported for porphyrin-based donor–acceptor linked systems. The use of 9-mesityl-10-methylacridinium ion, which has an extremely long-lived CS state, enables the construction of highly efficient photocatalytic systems such as oxygenation of aromatic compounds and hydrogen evolution.

Simple electron donor–acceptor dyads with a short spacer have been developed to attain a long-lived charge-separated state. The use of 9-mesityl-10-methylacridinium ion, which has 2 h charge-separation lifetime, enables the construction of highly efficient photocatalytic systems. Fullsize Image
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© 2009 The Chemical Society of Japan
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