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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 42: Poster Tuesday: Organic Molecules on Inorganic Surfaces

O 42.8: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Influence of Porphyrinoid Ring Contraction: Transition Metal Corroles — •Jan Herritsch1, Jan-Niclas Luy1, Malte Zugermeier1, Falk Niefind1, Qitang Fan1, Martin Schmid1, Peter Schweyen2, Martin Bröring2, Ralf Tonner1, and J. Michael Gottfried11Fachbereich Chemie, Philipps-Universität Marburg, Germany — 2Institut für Anorganische und Analytische Chemie, TU Braunschweig, Germany

Porphyrin complexes are well studied model systems for surface functionalization. Their reactivity can be controlled by variation of the ligand skeletal structure and the central atom. The related corroles represent contracted porphyrins. Contrary to the formally dianionic porphyrins, they usually act as trianionic ligands and stabilize higher oxidation states of the central atom. Here, we present the on-surface synthesis and characterization of different transition metal corroles (Fe, Co, Ni) on the Ag(111) surface and compare them with the corresponding porphyrins. Thus, we have studied the influence of ring contraction on the electronic structure and adsorbate-substrate interactions. The electronic states of the cobalt and nickel corrole complexes were found to be very similar to those of the corresponding porphyrins. This can partly be explained by the redox non-innocent behavior of the corrole ligand. In case of iron the corrole and porphyrin complexes differ from each other in their electronic state according to XP and NEXAFS spectra. These findings can be observed in the substrate-decoupled multilayer as well as in the monolayer and a higher oxidation state of the iron corrole was verified by UPS.

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