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Journal Article

Adatoms underneath Single Porphyrin Molecules on Au(111)


Mielke,  Johannes
Physical Chemistry, Fritz Haber Institute, Max Planck Society;


Grill,  Leonhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Universität Graz;

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Mielke, J., Hanke, F., Peters, M. V., Hecht, S., Persson, M., & Grill, L. (2015). Adatoms underneath Single Porphyrin Molecules on Au(111). Journal of the American Chemical Society, 137(5), 1844-1849. doi:10.1021/ja510528x.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0025-68A4-3
The adsorption of porphyrin derivatives on a Au(111) surface was studied by scanning tunneling microscopy and spectroscopy at low temperatures in combination with density functional theory calculations. Different molecular appearances were found and could be assigned to the presence of single gold adatoms bonded by a coordination bond underneath the molecular monolayer, causing a characteristic change of the electronic structure of the molecules. Moreover, this interpretation could be confirmed by manipulation experiments of individual molecules on and off a single gold atom. This study provides a detailed understanding of the role of metal adatoms in surface–molecule bonding and anchoring and of the appearance of single molecules, and it should prove relevant for the imaging of related molecule–metal systems.