Light-driven electron transfer between a photosensitizer and a proton-reducing catalyst Co-adsorbed to NiO

James M. Gardner, Maryline Beyler, Michael Karnahl, Stefanie Tschierlei, Sascha Ott, Leif Hammarström

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70 Citations (Scopus)


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 μs time scale by non-exponential kinetics. The observed process is the first essential step in the photosensitized generation of H2 from a molecular catalyst in the absence of a sacrificial donor reagent.

Original languageEnglish
Pages (from-to)19322-19325
Number of pages4
JournalJournal of the American Chemical Society
Issue number47
Publication statusPublished - Nov 28 2012


ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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