Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 75: Organic/bio Molecules on Metal Surfaces VI
O 75.13: Vortrag
Donnerstag, 14. März 2013, 19:00–19:15, H38
Chemisorbed Monolayers of Corannulene Penta-Thioethers on Gold — •Polina Angelova1, Ephrath Solel2, Galit Parvari2, Andrey Turchanin1, Mark Botoshansky2, Ehud Keinan2, and Armin Gölzhäuser1 — 1Physics of Supramolecular Systems and Surfaces, University of Bielefeld, Germany, — 2Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
Corannulene pentathioethers form highly stable monolayers on gold surfaces, as indicated by X-ray photoelectron spectroscopy (XPS). Formation of these homogeneous monolayers involves multivalent coordination of the five sulfur atoms to gold with the peripheral alkyl or aryl substituents pointing away from the surface. No dissociation of C-S bonds upon binding could be observed at room temperature. The XPS experiments reveal strong chemical bonding between the thioether groups and gold, comparable to the bonding between thiolates and gold surfaces. Temperature-dependent XPS study shows that the thermal stability of the monolayers is higher than the typical stability of self-assembled monolayers (SAMs)of thiolates on gold.