Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 44: Poster Session II (Semiconductors; Oxides and Insulators: Adsorption, Clean Surfaces, Epitaxy and Growth; Surface Chemical Reactions and Heterogeneous Catalysis; Surface or Interface Magnetism; Solid-Liquid Interfaces; Organic, Polymeric, Biomolecular Films; Particles and Clusters; Methods: Atomic and Electronic Structure; Time-resolved Spectroscopies)
O 44.12: Poster
Mittwoch, 28. März 2007, 17:00–19:30, Poster C
BINAP’s on Au(111) - Electronic interface properties — •Bengt Jaeckel and Bruce Parkinson — Colorado State University; Department of Chemistry; 200 West Lake Street; Fort Collins, CO-80523/USA
Substituted binapthyl-ligands (BINAPs) are important ligands for chiral selective homogeneous catalysis. We are attempting to prepare chiral selective surface by using organic MBE to prepare thin films of various racemic mixtures and enantiomerically pure BINAPs on freshly prepared Au(111)-surfaces. The interface properties were studied by X-Ray- and ultraviolet- photoelectron spectroscopy. Binapthol, the simplest and lightest molecule only forms a sub-monolayer coverage on Au(111) at room temperature. Substituted BINAPs (e. g. with two additional Br-atoms or two substitutional PC12H10-groups) show a higher sticking probability and provide interesting insight into the important parameters responsible for the interface formation. By varying the substitution of the basis molecule one can investigate the influence on the physical and chemical interactions with the substrate. Scanning tunneling microscopy studies will be carried out to determine the chiral properties of the molecules on the Au(111)-surface and if it possible to prepare enantiomeric pure surface which can be used for catalysis or sensing applications.