5 years ago

Exceptionally Long-Lived Photodriven Multi-Electron Storage without Sacrificial Reagents

Exceptionally Long-Lived Photodriven Multi-Electron Storage without Sacrificial Reagents
Martin Kuss-Petermann, Oliver S. Wenger
Photoexcitation of a molecular pentad in the presence of Sc3+ in de-aerated CH3CN leads to a quinone dianion that is stable on the millisecond timescale. Light-driven electron accumulation on the quinone unit is sensitized by two Ru(bpy)32+ complexes in an intramolecular process, which relies on covalently attached triarylamine donors rather than on sacrificial reagents. Lewis acid–Lewis base interactions between Sc3+ and quinone dianion are responsible for the exceptionally long lifetime of this photoproduct. Our study of photoinduced multi-electron transfer is relevant in the greater context of solar energy conversion. It′s so excited! Photoinduced charge accumulation is very difficult to achieve without sacrificial reagents. Metal ion-coupled electron transfer (MCET) is found to lead to an unusually long-lived charge-accumulated state in a molecular pentad.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201701456

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