Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 87: Metal Substrates: Structure, Epitaxy and Growth
O 87.9: Vortrag
Donnerstag, 10. März 2016, 17:15–17:30, S053
From Porphyrins to Pyrphyrins: Adsorption and Metalation on Au(111) — •Gerson Mette1, Denys Sutter1, Yeliz Gurdal2, Stephan Schnidrig2, Benjamin Probst2, Marcella Iannuzzi2, Jürg Hutter2, Roger Alberto2, and Jürg Osterwalder1 — 1Physik-Institut, Universität Zürich, CH-8057 Zürich — 2Institut für Chemie, Universität Zürich, CH-8057 Zürich
Pyrphyrin, a tetradentate bipyridine based macrocycle, represents an interesting but widely unexplored molecular ligand. It shares some similarities with the far better known porphyrins, but it is constituted by pyridyl subunits instead of pyrrols. A high stability of pyrphyrin and its corresponding complexes is suggested. Metal complexes based on pyrphyrin ligands have recently shown promise as water reduction catalysts in homogeneous photochemical water splitting reactions [1].
In this study, we examined the adsorption and metalation of pyrphyrin on a single crystalline surface by means of low-energy electron diffraction (LEED), scanning tunneling microscopy (STM), x-ray photoelectron spectroscopy (XPS) and density functional theory (DFT). Pyrphyrin coverages of approximately one monolayer and less were obtained by sublimation of the molecules on a Au(111) surface at room-temperature. Cobalt deposition and subsequent annealing led to the formation of Co-ligated pyrphyrin molecules. An intermediate state of the metalation reaction was observed and the reaction steps for the Co metalation of pyrphyrin molecules on Au(111) were established.
[1] E. Joliat et al., (in preparation).