Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 47, Pages 19322-19325Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja3082268
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Funding
- K&A Wallenberg Foundation
- Swedish Energy Agency
- Swedish Research Council
- Wenner-Gren Foundation
- German Academic Exchange Service (DAAD)
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While intermolecular hole-hopping along the surface of semiconductors is known, there are no previous examples of electron-hopping between molecules on a surface. Herein, we present the first evidence of electron transfer from the photoreduced sensitizer, Coumarin-343 (C343) to complex 1, both bound on the surface of NiO. In solution, 1 has been shown to be a mononuclear Fe-based proton-reducing catalyst. The reduction of 1 is reversible and occurs within 50 ns after excitation of C343. Interfacial recombination between the reduced 1((-)) and NiO hole occurs on a 100 mu s time scale by non-exponential kinetics. The observed process is the first essential step in the photosensitized generation of Hz from a molecular catalyst in the absence of a sacrificial donor reagent.
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