Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 10, Pages 5078-5082Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202015187
Keywords
charge transfer; interfaces; metalation; porphyrins; thin films
Categories
Funding
- Austrian Science Fund (FWF) [P27427-N20, I4145, I3731]
- Deutsche Forschungsgemeinschaft (DFG) [Po2226/2-1, Ri 804/8-1, SFB1083]
- Austrian Science Fund (FWF) [P27427] Funding Source: Austrian Science Fund (FWF)
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This study investigates the self-metalation of porphyrin molecules on ultrathin MgO(001) films, revealing that charge transfer promotes the self-metalation process. By tuning the work function of the substrate, the charge and metalation state of porphyrin molecules on the surface can be controlled.
Metalation and self-metalation reactions of porphyrins on oxide surfaces have recently gained interest. The mechanism of porphyrin self-metalation on oxides is, however, far from being understood. Herein, we show by a combination of results obtained with scanning tunneling microscopy, photoemission spectroscopy, and DFT computations, that the self-metalation of 2H-tetraphenylporphyrin on the surface of ultrathin MgO(001) films is promoted by charge transfer. By tuning the work function of the MgO(001)/Ag(001) substrate, we are able to control the charge and the metalation state of the porphyrin molecules on the surface.
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