Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 51: Metal Substrates: Adsorption of Organic/Bio Molecules III
O 51.4: Talk
Wednesday, February 27, 2008, 16:00–16:15, MA 041
Protection group controlled surface chemistry-organization and heat induced coupling of biphenyl derivatives on metal surfaces — •Serpil Boz1, Meike Stöhr1, Umut Soydaner2, and Marcel Mayor2 — 1University of Basel, Department of Physics, Klingelbergstrasse, CH-4056 Basel, Switzerland. — 2University of Basel, Department of Chemistry, St. Johannsring 19, CH-4056 Basel, Switzerland
The development of scanning probe methods enabled the investigation of molecules on surfaces with impressive resolutions. The arrangement of the molecules in ordered patterns occurs because of a delicate balance between molecule - substrate and intermolecular interactions such as van der Waals interactions, H-bonding or dipolar coupling. A very appealing concept is to profit from the order of these pre-organized structures and to interlink the molecular building blocks to macromolecules. A prominent example for this is diacetylenes which have been polymerized on surfaces either by UV-light or with aid of the STM tip. Here we would like to present our new concept to control both, the molecular self-assembly and the subsequent intermolecular coupling reactivity by protection group chemistry. We studied a BOC protected biphenyl derivative which forms a parallel and a herringbone arrangement at room temperature on a Cu (111) surface. A second phase is observed after the sample is annealed at 196°C and covalently linked dimers by splitting off the BOC groups are formed. As a result of further annealing, individual cross-shaped polymeric structures are obtained.