Visible-Light-Mediated Photocatalytic Aerobic Dehydrogenation of N-heterocycles by Surface-Grafted TiO2 and 4-amino-TEMPO
by Balayeva, N. O.; Zheng, N.; Dillert, R.; Bahnemann, D. W.
Herein, the visible-light-induced dehydrogenation of N-heterocycles such as tetrahydroquinolines, tetrahydroisoquinolines, and indolines in O-2-containing suspensions of a commercially available titanium dioxide photocatalyst yielding the corresponding heteroarenes is presented. 4-Amino-2,2,6,6-tetramethylpipiridinyloxyl (4-amino-TEMPO) was found to exhibit a beneficial role, as it increased the yield and improved the selectivity of the dehydrogenation reaction. Both the selectivity and the yield are further enhanced by grafting 0.1 wt % of Ni(II) ions onto the TiO2 surface. It is proposed that the basic reactant adsorbs at Lewis acid sites present at the TiO2 surface. The dehydrogenation reaction is initiated by visible-light excitation of the resulting surface complex and a subsequent single-electron transfer from the excited N-heterocycle via the conduction band of TiO2 to O-2. Ni(II) ions possibly serve as an electron transfer bridge between the conduction band of TiO2 and O-2, while the TEMPO derivative is assumed to act as a selective redox mediator involved in reactions of the generated reactive oxygen species.
- Journal
- ACS Catalysis
- Volume
- 9
- Issue
- 12
- Year
- 2019
- Start Page
- 10694-10704
- URL
- https://dx.doi.org/10.1021/acscatal.9b03322
- ISBN/ISSN
- 2155-5435
- DOI
- 10.1021/acscatal.9b03322