Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 63: Focus Session: Functional Molecules at Surfaces III

O 63.2: Invited Talk

Wednesday, March 18, 2020, 10:45–11:15, TRE Ma

The art of molecular manipulation with the scanning tunneling microscope: controlled rotations — •Nicolas Lorente — Centro de Fisica de Materiales (CSIC-EHU) and DIPC, San Sebastian, Spain

Rotations are key to the functioning of molecular machines. Controlling how to induce and stop the rotation of a molecule about a well defined axle is a difficult task that needs to be mastered. This is an important part of the research undertaken by the EU-H2020 project MEMO (https://www.memo-project.eu/flatCMS/). In this talk I will rationalize the ingredients to obtain molecular rotations. Among them, dispersive forces seem to be a must for all molecular systems where rotations can be effected. I will show controlled rotations of two molecular systems. One is a supramolecule formed by aceto-byphenil molecules on Au (111) largely characterized by dispersive interactions [1-3], and the second systems is a radical 2-(2-methoxyphenyl)-1,3-dimethyl-2,3-dihydro-1H-benzoimidazole (o-MeO-DMBI) that binds covalently by a single bond and the rest of the interaction is given by van der Waals forces [4]. We have used density functional theory completed with dispersive forces [3]. We have furthered the study by unraveling the interaction between tunneling electrons and molecular rotations [5].

[1] Anja Nickel et al. ACS Nano 7, 191 (2013)

[2] Vladimir Zobac et al.

[3] Roberto Robles, et al.

[4] Frank Eisenhut et al.

[5] Alexander Croy et al.