Bioinspired electron-transfer systems and applications

被引：0
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作者：
Fukuzumi, Shunichi [1 ]
机构：
[1] Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871
来源：
Bulletin of the Chemical Society of Japan | 2006年 / 79卷 / 02期
关键词：
Bioinspired electron-transfer systems including artificial photosynthesis and respiration are presented herein together with some of their applications. First; multi-step electron-transfer systems composed of electron donor-acceptor ensembles have been developed; mimicking functions of the photosynthetic reaction center. However; a significant amount of energy is lost during the multi-step electron-transfer processes. Then; as an alternative to conventional charge-separation functional molecular models based on multi-step long-range electron transfer within redox cascades; simple donor-acceptor dyads have been developed to attain a long-lived and high energy charge-separated state without significant loss of excitation energy; by fine control of the redox potentials and of the geometry of donor-acceptor dyads that have small reorganization energies of electron transfer. Such simple molecular dyads; capable of fast charge separation but extremely slow charge recombination; have significant advantages with regard to synthetic feasibility; providing a variety of applications including construction of organic solar cells and development of efficient photocatalytic systems for the solar energy conversion. An efficient four-electron reduction of dioxygen to water by one-electron reductants such as ferrocene derivatives as well as by an NADH analog has also been achieved as a respiration model by using a cofacial dicobalt porphyrin that can form the μ-peroxo Co(III)-O2-Co(III) complex. The catalytic mechanism of the four-electron reduction of dioxygen has been clarified based on the detailed kinetic study and the detection of the intermediate. © 2006 The Chemical Society of Japan;
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页码：177 / 195
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