Adatoms underneath Single Porphyrin Molecules on Au(111)

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 a...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2015-02, Vol.137 (5), p.1844-1849
Main Authors: Mielke, Johannes, Hanke, Felix, Peters, Maike V, Hecht, Stefan, Persson, Mats, Grill, Leonhard
Format: Article
Language:English
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Summary: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.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja510528x