Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 68: Polymeric biomolecular films
O 68.4: Vortrag
Donnerstag, 17. März 2011, 12:00–12:15, WIL B122
NEXAFS of azobenzene-based molecular photoswitches — •Eric Ludwig1, Sonja Kuhn1, Thomas Strunskus2, Alexei Nefedov3, Ulrich Jung1, Jens Kubitschke4, Rainer Herges4, Christof Wöll3, Olaf Magnussen1, Lutz Kipp1, and Kai Rossnagel1 — 1Institut für Experimentelle und Angewandte Physik, Universität Kiel, D-24098 Kiel — 2Institut für Materialwissenschaft, Universität Kiel, D-24098 Kiel — 3Institut für Funktionelle Grenzflächen, Karlsruher Institut für Technologie, D-76344 Eggenstein-Leopoldshafen — 4Otto-Diels-Institut für Organische Chemie, Universität Kiel, D-24098 Kiel
The adsorption behavior of azobenzene-based molecular switches was investigated by NEXAFS. We deposited pure azobenzene on weakly interacting surfaces of layered compounds. Furthermore, we report results of photoswitches employing molecular platforms based on the triazatriangulenium (TATA) ion with functional groups attached to the central carbon atom which form self-assembled monolayers on Au(111) surfaces. This “platform approach” enforces equal spacing of the molecules as well as decoupling of the functional group from the substrate. NEXAFS measurements were performed at BESSY (beamline HE-SGM) utilizing a Prevac endstation.
Results on azobenzene indicate flat-lying molecules when preparing monolayer systems and a non-planar configuration within multilayer systems. Data on Azo-TATA molecules corroborate successful and non-destructive sample preparation. This work was supported by the DFG through SFB 677.