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Keywords:

  • photooxidation;
  • radical reactions ;
  • TEMPO;
  • TiO2;
  • visible light
Thumbnail image of graphical abstract

Like a differential gear: Upon irradiation with visible light, excited dye molecules inject electrons into TiO2 and form dye radicals, which can oxidize TEMPO to TEMPO+, which in turn oxidizes alcohols in the presence of O2 selectively to corresponding aldehydes. One reason for the selectivity is that the irradiation is downshifted to visible light.