Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 98: Organic-Inorganic Systems V: Adsorption on Metals
O 98.1: Vortrag
Freitag, 11. März 2016, 10:30–10:45, H24
Thiolate versus Selenolate: Structure, Stability, and Charge Transfer Properties — •Tobias Wächter1, Jakub Ossowski2, Laura Silies3, Martin Kind3, Agnieszka Noworolska2, Florian Blobner4, Dominika Gnatek2, Jakub Rysz2, Michael Bolte3, Peter Feulner4, Andreas Terfort3, Piotr Cyganik2, and Michael Zharnikov1 — 1Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany — 2Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Krakow, Poland — 3Institut für Anorganische und Analytische Chemie, Universität Frankfurt, Max-von-Laue-Straße 7, 60438 Frankfurt, Germany — 4Physikdepartment E20, Technische Universität München, 85747 Garching, Germany
Self-assembled monolayers (SAMs) of 6-cyanonapthalene-2-thiolate and -selenolate were prepared on Au(111) and characterized by several complementary spectroscopic techniques. The exact structural arrangements in both types of SAMs are somewhat different, but at the same time they have similar packing densities and molecular orientations. This permitted reliable competitive exchange and ion-beam-induced desorption experiments which provided unequivocal evidence for a stronger bonding of selenolates to the substrate as compared to the thiolates. Regardless of this difference, the dynamic charge transfer properties of both adsorbates were found to be nearly identical, as determined by the core-hole-clock approach, which is explained by a redistribution of electron density along the molecular framework, compensating the difference in the bond strength.