Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 51: Metal Substrates: Adsorption of Organic/Bio Molecules III
O 51.10: Talk
Wednesday, February 27, 2008, 17:30–17:45, MA 041
Adsorption and ordering of a triphenylene Cr(CO)3 complex on noble metal surfaces — •Christoph H. Schmitz1, Julian Ikonomov1, Iordan Kossev1, Carola Rang2, Serguei Soubatch3, Olga Neucheva3, Frank Stefan Tautz3, Karl Heinz Dötz2, and Moritz Sokolowski1 — 1Institut für Physikalische und Theoretische Chemie, Universität Bonn — 2Kekulé-Institut für Organische Chemie und Biochemie, Universität Bonn — 3Institute of Bio- and Nanosystems 3, Forschungszentrum Jülich
Adsorption by physical vapor deposition of metal-organic complexes is so far known for metallocene- and phthalocyanine-derivatives. Here we report on the deposition of the chromium complex (1,2,3,4,4a,12b)-tricarbonyl-(2,3-diethyl-1,4-dimethoxytriphenylene)chromium(0) (TPHC) and the corresponding ligand 2,3-diethyl-1,4-dimethoxytriphenylene (TPH). This complex is of interest, since a haptotropic migration of the Cr(CO)3-moiety is found in solution and may also be present in adsorbed layers. We succeeded to prepare ordered layers of TPHC and TPH on silver and copper single crystal surfaces that were investigated by scanning tunneling microscopy and x-ray photoelectron spectroscopy. STM shows the formation of long range ordered structures with different unit cells for TPHC and TPH. This demonstrates that the Cr(CO)3-moiety has a decisive influence on the lateral interaction of the molecules on the surface. XPS results reveal the intact adsorption of TPHC. Experiments with low energy electron diffraction, however, fail since a decomposition of the complex due to electron bombardment occurs. (Funded by DFG SFB 624)