Dyads and Triads Based on Phenothiazine, Bis(terpyridine)ruthenium(II) Complexes, and Fullerene

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• 作者：Kevin Barthelmes ; Andreas Winter and Ulrich S. Schubert
• 刊名：European Journal of Inorganic Chemistry
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：2016
• 期：32
• 页码：5132-5142
• 全文大小：1857K
• ISSN：1099-0682c

文摘

We report the modular synthesis of donor–photosensitizer–bridge–acceptor (D–P–B–A) triads and D–P dyads for the formation of photoinduced charge-separated species. The structures are based on a phenothiazine unit (D), a bis(terpyridine) [bis(tpy)] ruthenium(II) complex (P), several phenylene(ethynylene)-type spacer units (B), and a pyrrolidino[60]fullerene entity (A). The donor–acceptor distance is between 18 and 37 Å and was varied by four different bridging units. The photophysical and electrochemical characterization revealed certain interactions between the active moieties in the ground and the excited state. In particular, a reduced ruthenium-based emission in the triads indicates the occurrence of a quenching process mediated by the fullerene entity. Strong electrostatic interactions between the ruthenium(II) complex and the pyrrolidino[60]fullerene have been observed for the shortest triad, resulting in the strongest electron-accepting pyrrolidino[60]fullerene unit in the series.