Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Inorganic/Organic Interfaces
O 41.47: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster B
Light-induced ring-closure isomerization of a diarylethene derivate in direct contact with surfaces — •Fabian Nickel1, Matthias Bernien1, Sandro Wrzalek1, Martin Herder2, Pantelis Chittas1, Kai Kraffert1, Lucas M. Arruda1, Lalminthang Kipgen1, Stefan Hecht2, and Wolfgang Kuch1 — 1Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, 14195 Berlin — 2Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin
The photochromic isomerization of molecules in direct contact with solid surfaces can be important for the further miniaturization of molecular electronic devices. A potential candidate for this purpose is T-DAE, a diarylethene derivate with attached phenyl groups. This molecule can be switched reversibly between two metastable states in solution. In the closed-ring configuration, a conjugated conduction path through the molecule exists, making it interesting for photochromic switching of the electronic interaction between two attached end groups. In-situ X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) experiments performed on T-DAE adsorbed on Bi(111), Au(111), and highly oriented pyrolytic graphite (HOPG) revealed a UV-light-induced ring-closure reaction on Bi(111) and HOPG. Spectroscopy of the sulfur 2p core electrons shows the existence of three different species of molecules after light exposure, pointing towards the presence of a byproduct that is known to exhibit no reversible switching.
This work is supported by the DFG through Sfb 658.