Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.11: Poster
Tuesday, April 1, 2014, 18:30–22:00, P1
Cyano-Functionalized Triarylamines on Au(111): Competing Intermolecular versus Molecule/Substrate Interactions — •Stefano Gottardi1, Kathrin Müller1, Juan Carlos Moreno-López1, Handan Yildirim3, Ute Meinhardt2, Milan Kivala2, Abdelkader Kara3, and Meike Stöhr1 — 1Zernike Institute of Advanced Materials, University of Groningen, AG, Groningen, The Netherlands — 2Chair of Organic Chemistry 1, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany — 3Department of Physics, University of Central Florida, Orlando, FL, USA
The self-assembly of cyano-substituted triarylamine derivatives on Au(111) is studied with scanning tunneling microscopy and density functional theory calculations. Two different phases, each stabilized by at least two different cyano bonding motifs are observed. In the first phase, each molecule is involved in dipolar coupling and hydrogen bonding, while in the second phase, dipolar coupling, hydrogen bonding and metal-ligand interactions are present. Interestingly, the metal/ligand bond is already observed for deposition of the molecules with the sample kept at room temperature leaving the herringbone reconstruction unaffected. It is proposed that for establishing this bond, the Au atoms are slightly displaced out of the surface to bind to the cyano ligands. Despite the intact herringbone reconstruction, the Au substrate is found to considerably interact with the cyano ligands affecting the conformation and adsorption geometry, as well as leading to correlation effects on the molecular orientation.