Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 29: Organic/bio Molecules on Metal Surfaces III
O 29.1: Vortrag
Dienstag, 12. März 2013, 10:30–10:45, H38
Optically and thermally induced reactions of an azobenzene derivative on Bi(111) — •Christopher Bronner1, Beate Priewisch2, Karola Rück-Braun2, and Petra Tegeder1,3 — 1Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin, Germany — 2Technische Universität Berlin, Institut für Chemie, Straße des 17. Juni 115, 10623 Berlin, Germany — 3Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
Molecular switches which undergo photo-induced isomerization reactions are considered promising building blocks in the development of nanotechnological devices such as data storage, molecular electronics or functionalized surfaces. Generally, such systems are envisioned to be mounted at surfaces or interfaces of solids. However, the majority of such molecules lose their switching functionality when adsorbed directly on a (metal) surface, which is usually attributed to electronic coupling and/or steric hindrance. Controlled tuning of the coupling strength in these adsorbate/substrate systems is therefore considered crucial to restore functionality.
We found that di-meta-cyano-azobenzene (DMC) adsorbed on a semi-metallic bismuth substrate undergoes a photo-induced trans-cis isomerization reaction both in the first layer and the multilayer, while the photo-induced back-reaction is not observed. In addition, we found a thermally activated reaction of the cis isomer.