Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 45: Organische Dünnschichten IV
O 45.11: Vortrag
Dienstag, 8. März 2005, 18:15–18:30, TU EB301
Conjugated organic molecules on Au(111): Effect of molecular geometry and conformational changes — •Carsten Busse1, Sigrid Terkelsen1, Lars Petersen1, Morten Nielsen2, Kurt V. Gothelf2, Trolle R. Linderoth1 und Flemming Besenbacher1 — 1Department of Physics and Astronomy and iNANO, University of Aarhus, 8000 Aarhus C, Denmark — 2Department of Chemistry and iNANO, University of Aarhus, 8000 Aarhus C, Denmark
We have performed a UHV-STM study of structures formed by a family of geometrically different, but chemically similar, molecules adsorbed on Au(111). The molecules consist of a central benzene ring with three or two ethynylene spokes, each terminating in a tert-butyl substituted salicylaldehyde moiety. After adsorption at 300 K a variety of close-packed phases is observed which can be rationalized by a common motif of molecules adsorbed with their backbone parallel to the surface and optimized side-to-side interactions. These results constitute a platform for ongoing experiments where conformational changes of the adsorbed molecules are studied and the molecular parameters governing this flipping process are determined, and where covalent cross-linking is induced through co-adsorption with reactive amines.