Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 78: Poster: Surface Dynamics - Reactions, Elementary Processes and Phase Transitions
O 78.8: Poster
Mittwoch, 14. März 2018, 18:15–20:30, Poster A
Molecular motors on a surface studied by scanning tunneling microscopy — •Monika Schied1, James M. Tour2, and Leonhard Grill1 — 1Department of Physical Chemistry, University of Graz, Austria — 2Department of Chemistry, Rice University, USA
Artificial molecular motors can translate an external stimulus into controlled motion. They have seen great developments in the last decades [1]. While many studies exist in solution, only very little is known how such functional molecules behave on a surface, although such a setup holds the advantage of a fixed point of reference. This is of importance for a key property of molecular machines, the directionality of their motion in a static environment.
In this study, artificial motor molecules have been investigated, all based on a combination of double bond isomerization and helix inversion, which are the key processes responsible for rotation of the so-called Feringa motor. This type of motor has already been used to successfully drive lateral translation of molecules at surfaces [2, 3]. Experiments were done by low temperature scanning tunneling microscopy (STM) to enable imaging of one and the same molecule before applying an external stimulus. The focus of our study is on the adsorption of such molecules at metallic surfaces and what type of motion can be induced by either STM manipulation or illumination by light.
[1] W. R. Browne and B. L. Feringa, Nat. Nanotech. 1, 25 (2006)
[2] T. Kudernac et al., Nature 479, 208 (2011)
[3] A. Saywell et al., ACS Nano 10, 10945 (2016)