A Molecular Light-Driven Water Oxidation Catalyst

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• 作者：Nattawut Kaveevivitchai ; Raghu Chitta ; Ruifa Zong ; Maya El Ojaimi ; Randolph P. Thummel
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：July 4, 2012
• 年：2012
• 卷：134
• 期：26
• 页码：10721-10724
• 全文大小：264K
• 年卷期：v.134,no.26(July 4, 2012)
• ISSN：1520-5126

文摘

Two mononuclear Ru(II) complexes, [Ru(ttbt)(pynap)(I)]I and [Ru(tpy)(Mepy)₂(I)]I (tpy = 2,2鈥?6,2鈥?terpyridine; ttbt = 4,4鈥?4鈥?tri-tert-butyltpy; pynap = 2-(pyrid-2鈥?yl)-1,8-naphthyridine; and Mepy = 4-methylpyridine), are effective catalysts for the oxidation of water. This oxidation can be driven by a blue (位_max = 472 nm) LED light source using [Ru(bpy)₃]Cl₂ (bpy = 2,2鈥?bipyridine) as the photosensitizer. Sodium persulfate acts as a sacrificial electron acceptor to oxidize the photosensitizer that in turn drives the catalysis. The presence of all four components, light, photosensitizer, sodium persulfate, and catalyst, are required for water oxidation. A dyad assembly has been prepared using a pyrazine-based linker to join a photosensitizer and catalyst moiety. Irradiation of this intramolecular system with blue light produces oxygen with a higher turnover number than the analogous intermolecular component system under the same conditions.