Synthesis and Electron Transfer Studies of Ruthenium-Terpyridine-Based Dyads Attached to Nanostructured TiO2

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• 作者：Henriette Wolpher ; Subrata Sinha ; Jingxi Pan ; Anh Johansson ; Maria J. Lundqvist ; Petter Persson ; Reiner Lomoth ; Jonas Bergquist ; Licheng Sun ; Villy Sundströ ; m ; Bjö ; rn Å ; kermark ; Tomá
• 刊名：Inorganic Chemistry
• 出版年：2007
• 出版时间：February 5, 2007
• 年：2007
• 卷：46
• 期：3
• 页码：638 - 651
• 全文大小：356K
• 年卷期：v.46,no.3(February 5, 2007)
• ISSN：1520-510X

文摘

A series of bis(terpyridine)Ru^II complexes have been prepared, where one of the terpyridines is functionalized inthe 4'-position by a phosphonic or carboxylic acid group for attachment to TiO₂. The other is functionalized, alsoin the 4'-position, by a potential electron donor. In complexes 1a, 3a, and 4a,b, this donor is tyrosine or hydrogen-bonded tyrosine, while in 2a it is carotenoic amide. The synthesis and photophysical properties of the complexesare discussed. On irradiation with visible light, the formation of a long-lived charge-separated state was anticipated,via primary electron ejection into the TiO₂, followed by secondary electron transfer from the donor to thephotogenerated Ru^III. However, such a charge-separated state could be observed with certainty only with complex2a. To explain the result, quantum chemical calculations were performed on the different types of complexes.