Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 96: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures VI
O 96.1: Vortrag
Donnerstag, 15. März 2018, 15:00–15:15, MA 004
On-Surface Synthesis and Characterization of an Iron Corrole — •Martin Schmid1, Malte Zugermeier1, Jan Herritsch1, Benedikt Klein1, Claudio Krug1, Lukas Ruppenthal1, Philipp Müller1, Martin Bröring2, and J. Michael Gottfried1 — 1Philipps-Universität Marburg, Fachbereich Chemie, Marburg, Germany — 2Technische Universität Braunschweig, Institut für Anorganische und Analytische Chemie, Braunschweig, Germany
Tetrapyrrole layers (e.g. porphyrins or phthalocyanines) can be metalated with an on-surface reaction scheme under UHV conditions to obtain the corresponding metallo-tetrapyrroles, in which the metal atoms usually have a +II oxidation state. In order to obtain different oxidation states in the tetrapyrrole films, we examined an alternative class of molecules: corroles. Corroles differ from porphyrins by the absence of one bridging CH unit between two pyrrole units and the presence of a further hydrogen atom in the central pocket of the molecule. Thus, one could expect to find metal atoms in a +III oxidation state. We prepared multilayers and monolayers of 3H-hexaethyl-dimethyl-corrole (3H-HEDMC) on Ag(111) and performed a series of in-situ metalation experiments wit Fe. We analyzed the systems with XPS, UPS, NEXAFS and STM. We find that the corrole ligands can be in-situ metalated and that the iron metal centers are in a +III oxidation state in the multilayer. Additional comparative measurements with Fe(II)-octaethylporphyrin monolayers elucidate differences in the valence electronic structure between Fe(II) and Fe(III) tetrapyrroles on Ag(111).