| Abstract
| - A series of bis(terpyridine)RuII 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 RuIII. 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.
- A series of bis(terpyridine)ruthenium(II) complexes have been studied, where one terpyridine ligand is attached to TiO2 via a phosphonate or carboxylate group. When a carotenoid donor is connected to the second terpyridine ligand, irradiation with visible ligth gives electron injection into TiO2. Secondary electron transfer from the carotenoid then generates a long-lived (μs) charge-separated state.
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