Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 11: Metal substrates: Adsorption of organic / bio molecules II
O 11.3: Vortrag
Montag, 23. März 2009, 15:30–15:45, SCH A118
STM investigation of imine-based molecular switches on Au(111) — •Johannes Mielke1, Ying Luo2, Rainer Haag2, and Leonhard Grill1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin — 2Institut für Chemie und Biochemie - Organische Chemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin
In the field of molecular electronics, molecular switches are highly relevant because they can control the conductance. Switches based on azobenzene molecules have attracted large interest in the last years. A very similar molecular switch can be created by replacing the functional azo group by an imine group, which does not considerably alter the electronic structure of the molecule and conserves the capability of undergoing a reversible trans-cis isomerisation. Such processes have already been studied in solution and the gas phase but not on surfaces.
In this work, imine molecules with four tert-butyl groups were adsorbed on Au(111) and their adsorption and switching behaviour were studied using a low temperature STM. The molecules were found to form two types of ordered islands and an interesting irreversible switching behaviour was observed when looking at their temperature dependence, because the number of trans isomers was reduced upon heating of the sample.