Regensburg 2010 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 43: Biomolecular and Functional Organic Layers II (Focused Session)
DS 43.7: Vortrag
Freitag, 26. März 2010, 13:15–13:30, H2
Structural Characterization of Self-assembled Monolayers of Pyridine-terminated Thiolates on Gold — •Jinxuan Liu1, Björn Schüpbach2, Asif Bashir3, Osama Shekhah1, Alexei Nefedov1, Martin Kind1, Andreas Terfort2, and Christof Wöll4 — 1Lehrstuhl für Physikalische Chemie I, Ruhr-Universität Bochum, 44780 Bochum, Germany — 2Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt am Main, 60325 Frankfurt, Germany — 3Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung, 40237 Düsseldorf, Germany — 4Institute of Functional Interfaces, Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe, Germany
Self-assembled monolayers (SAMs) on Au from a homologous series of four pyridine-terminated organo thiols have been investigated using a variety of surface-analytical techniques (IR, XPS, NEXAFS, STM) and DFT calculations. For all pyridine-terminated thiols the immersion of Au-substrates in the corresponding ethanolic solutions was found to result in the formation of highly ordered and densely packed SAMs. For an even number of the methylene spacers between the SH group and the aromatic moieties the SAM unit-cell is rather large, 5√3× 3, whereas in case of an odd number of methylene units a smaller unit cell is adopted, 2√3×√3 R30∘. The tilt-angle of the molecules amounts to 15∘. In contrast to expectation, the pyridine-terminated organic surfaces exposed by the corresponding SAMs showed a surprisingly strong resistance with regard to protonation.