Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 55: Poster Session III - MA 141/144 (Methods: Atomic and Electronic Structure; Particles and Clusters; Heterogeneous Catalysis; Semiconductor Substrates: Epitaxy and Growth+Adsorption+Clean Surfaces+Solid-Liquid Interfaces; Oxides and Insulators: Solid-Liquid Interfaces+Epitaxy and Growth; Phase Transitions; Metal Substrates: Adsorption of Inorganic Molecules+Epitaxy and Growth; Surface Chemical Reactions; Bimetallic Nanosystems: Tuning Physical and Chemical Properties; Oxides and insulators: Adsorption; Organic, polymeric, biomolecular films; etc.)

O 55.50: Poster

Wednesday, February 27, 2008, 18:30–19:30, Poster F

Direct metalation of phthalocyanine and tetraphenylporphyrin on Ag(111) with co-adsorbed iron atoms — •Yun Bai, Florian Buchner, Matthew Wendahl, Robert Staehle, Ina Kellner, Andreas Bayer, Hubertus Marbach, Jörg Michael Gottfried, and Hans-Peter Steinrück — Universität Erlangen-Nürnberg, Lehrstuhl für Physikalische Chemie II, Egerlandstr. 3, 91058 Erlangen, Germany

Metalloporphyrins and metallophthalocyanines are promising candidates for the functionalization of surfaces on the nanoscale because they combine a reactive metal ion with a planar organic ligand, which serves as a structure-forming element. Potential applications of such functionalized surfaces include heterogeneous catalysts with well-defined active sites and sensor systems. In this contribution, we report the in-situ preparation of related model systems, in particular Fe(II)-phthalocyanine and Fe(II)-tetraphenylporphyrin monolayers on Ag(111). Both complexes are sensitive toward oxidation and react readily with molecular oxygen, which makes the preparation of the adsorbates by ex-situ metalation of the ligands in solution and subsequent deposition difficult. Instead, we deposited monolayers of the less reactive metal-free ligands and metalated them with the stoichiometric amounts of vapour-deposited Fe atoms in an ultra-high vacuum environment. This surface-mediated redox reaction was studied with XPS and STM and was found to proceed with high yield (up to 95%). Supported by the DFG through SFB 583.