Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 16: Organic, polymeric, biomolecular films - also with adsorbates
O 16.4: Vortrag
Montag, 22. März 2010, 15:45–16:00, H46
Self-assembled monolayers of perfluoroterphenyl-substituted alkanethiolates on coinage metal substrates — •Frederick Chesneau1, Björn Schüpbach2, Katarzyna Szelagowska-Kunstman3, Nirmalya Ballav1, Piotr Cyganik3, Andreas Terfort2, and Michael Zharnikov1 — 1Angewandte Physikalische Chemie, Universität Heidelberg, 69120 Heidelberg, Germany — 2Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt, 60438 Frankfurt, Germany — 3Faculty of Physics, Astronomy, and Applied Computer Science, Jagiellonian University, 30059 Krakow, Poland
Self-assembled monolayers (SAMs) formed by perfluoroterphenyl-substited alkanethiols (FTPn, with n being the number of the methylene units) with variable length of the aliphatic linker (n = 2 and 3) on (111) Au and Ag were characterized by a combination of several complementary spectroscopic and microscopic techniques. The SAMs were found to be well-defined, highly ordered, and densely packed, which suggest a strong correlation between the orientations of the analogous rings in the adjacent molecules. In addition, the SAMs exhibited pronounced odd-even effects, i.e. dependence of the molecular orientation and packing density on the length of the aliphatic linker, with parity of n being the decisive parameters and the direction of the effects on Au opposite to that on Ag. The presence of the odd-even effects in the FTPn system, characterized by distinctly non-planar conformation of the FTP moieties, brings new aspects into the discussion about the origin of these effects.