Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 58: Organic-Inorganic Systems III: Metal-Organics
O 58.1: Talk
Wednesday, March 9, 2016, 15:00–15:15, S054
Oxidation State Tuning in Ligand-Metal Surface Reaction: Formation of M(III)-Corroles on Ag(111) — •Malte Zugermeier1, Nicolas Bock1, Min Chen1, Falk Niefind1, Jan Herritsch1, Lukas Ruppenthal1, Martin Schmid1, Peter Schweyen2, Martin Bröring2, and J. Michael Gottfried1 — 1Fachbereich Chemie, Philipps-Universität Marburg, Germany — 2Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Germany
Surface-supported planar metal complexes are of high technical interest for catalytic applications combining the advantages of heterogeneous and homogeneous catalysis. However, a high degree of control over the chemical and electronic properties of the metal centers is required. While this control can be achieved by the attachment of axial ligands, these ligands compete with the reactants for the axial coordination site. Therefore, a more suitable solution is achieved by modification of the planar ligand. We demonstrate that adsorbed corroles on Ag(111) oxidize metal atoms to their +III state and form the corresponding metal complexes. In contrast, adsorbed porphyrins and phthalocyanines can oxidize co-adsorbed metal atoms only to +II ions. Corroles differ from the closely related porphyrins by the absence of a single carbon atom in the macrocycle. The resulting size-reduced ring provides a tighter coordination environment and stabilizes higher oxidation states. Specifically, we studied monolayers and multilayers of an octa-alkyl corrole and their reaction with Ni and Co atoms on a Ag(111) surface by XPS, UPS and STM.