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Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 56: Metal substrates: Adsorption of organic / bio molecules VI

O 56.7: Vortrag

Mittwoch, 24. März 2010, 16:30–16:45, H36

Studies of azobenzene-containing triazatriangulenium adlayers on Au(111) surfaces — •Ulrich Jung1, Sonja Kuhn1, Mathias Müller1, Olena Filinova1, Belinda Baisch1, Jens Kubitschke2, Rainer Herges2, and Olaf Magnussen11Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Leibnizstraße 19, 24118 Kiel, Germany — 2Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität zu Kiel, Otto-Hahn-Platz 3, 24098 Kiel, Germany

The attachment of molecular functions such as photoswitches to metal surfaces is of major interest in nanotechnology. One of the most frequently studied class of photoswitches are azobenzenes, which exhibit trans-cis isomerism. The typical method to attach azobenzene to surfaces is self-assembly of thiols on Au. However, in such adlayers the photoisomerization is often totally quenched because of steric effects. To overcome the problems of conventional azobenzene adlayers, we were employing a novel approach using customizable triazatriangulenium (TATA) platforms [1]. Here, we will present the structure and photoswitching properties of azobenzene-containing TATA adlayers on Au(111), obtained by structure-sensitive, spectroscopic, and electrochemical methods. Functionalized TATA molecules exhibit a strong tendency to form bilayers. We will demonstrate, that it is possible to suppress bilayer formation and thus to form highly-ordered functionalized TATA monolayers. Furthermore, the photoswitching processes in these adlayers obey first order kinetics with quantum efficiencies of < 10-3. [1] Baisch et al., J. Am. Chem. Soc. (2009), 131, 442

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