Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 69: Poster Wednesday: Organic Molecules on Inorganic Surfaces
O 69.2: Poster
Mittwoch, 3. April 2019, 17:45–20:00, Poster B2
Rotation of a Single-Molecule Dipole — •Grant J Simpson1, Víctor García-López2, A. Daniel Boese1, James M Tour2, and Leonhard Grill1 — 1University of Graz, Graz, Austria — 2Rice University, Texas, USA
Control of the orientation and the direction of rotation of a single molecule is crucial to the understanding of molecular machines. Directed rotation is also necessary to transfer mechanical work from one molecule to another in a controlled way. Here, we report how single dipolar molecules adsorbed on a Ag(111) surface can be oriented with maximum precision using the electric field in the junction of a scanning tunnelling microscope. Rotation is found to occur around a fixed pivot point and both directions of rotation are realised with 100% directionality. The pivot point arises as result of the interaction of an oxygen atom in the molecule and a silver atom of the surface. By introducing a further Ag adatom underneath the molecule, this interaction can be disrupted and the rotation of the molecule can be modified.