Photoelectrochemical oxidation of a turn-on fluorescent probe mediated by a surface MnII catalyst covalently attached to TiO2 nanoparticles

Alec C. Durrell, Gonghu Li, Matthieu Koepf, Karin J. Young, Christian F.A. Negre, Laura J. Allen, William R. McNamara, Hee Eun Song, Victor S. Batista, Robert H. Crabtree, Gary W. Brudvig

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


A manganese complex covalently attached to a TiO2 electrode via a light-absorbing organic linker (L) was used in the photooxidation of 20,70-dihydrodichlorofluorescein (H2DCF). Significant and sustained photocurrent was observed upon visible-light illumination of the fully assembled anode in the presence of the substrate. The two-electron, two-proton oxidation of H2DCF yields the fluorescent compound, 20,70- dichlorofluorescein (DCF). Our studies suggest that the MnII-L-TiO2 architecture is an effective photoanode for multielectron chemistry, as production of DCF under visible-light illumination exceeds yields observed for bare TiO2 as well as ZnII-L-TiO2 anodes. The turn-on fluorescent behavior of H2DCF upon oxidation makes it an excellent substrate for the study of new photoanodes. The high fluorescence quantum yield of DCF allows for nanomolar sensitivity and real-time monitoring of substrate oxidation.

Original languageEnglish
Pages (from-to)37-44
Number of pages8
JournalJournal of Catalysis
Publication statusPublished - 2014


  • Dye-sensitized photoelectrochemical cell
  • Photoanode
  • Turn-on fluorescence

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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