Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 12: Organic-Inorganic Hybrid Systems and Organic Films II
O 12.6: Vortrag
Montag, 20. März 2017, 16:15–16:30, WIL A317
Self-assembly and metal coordination of surface-adsorbed Pyrphyrin molecules — •Jingyi Li1, Christian Wäckerlin1, Stephan Schnidrig2, Evelyne Joliat2, Roger Alberto2, and Karl-Heinz Ernst1,2 — 1Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland — 2Institut für Chemie, Universität Zürich, CH-8057 Zürich, Switzerland
The pyrphyrin molecule, which in contrast to porphyrin consists of four fused pyridine groups instead of pyrrol groups in its macrocycle, has been predicted to be a potential molecular catalyst. Using thermal desorption and X-ray photoelectron spectroscopy, we demonstrate that in monolayer coverage on Cu(111), the core of pyrphyrin is metalated with Cu adatoms at 377 K. Scanning tunneling microscopy reveals different self-assembly patterns before and after metalation. 2D honeycomb and 1D linear arrangements of pyrphyrin molecules are formed by linking the the cyano groups of pyrphyrin to Cu adatoms. Dehydrogenation at the periphery of the molecule after annealing at 520 K leads to the disappearance of self-assembled layers.