Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 103: Focus Session: Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation IV
O 103.3: Vortrag
Freitag, 22. März 2024, 11:15–11:30, HE 101
Tip-induced and thermally activated rotation of bowl-shaped bridged-triphenylamine derivatives on Au(111) — •Sajjan Mohammad1, Milan Kivala2, Meike Stöhr1, and Sabine Maier1 — 1Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany — 2Institute of Organic Chemistry, University of Heidelberg, Germany
We studied the adsorption and rotation under external excitation of bowl-shaped bridged-triphenylamine derivatives on Au(111) using low-temperature scanning probe microscopy. The primarily observed three-lobed structure suggests that individual bridged-triphenylamine molecules adsorb in a bowl-up conformation, with the central atom anchoring to the Au(111) surface and the three benzene rings suspended above it. The onset and mechanism of rotation were examined through STM tip manipulation experiments and thermal activation. Our results demonstrate that the central atom of a bridged triphenylamine acts as an effective axle, ensuring sufficient anchoring to prevent diffusion and facilitating low rotational barriers for single molecule rotors on a metal surface.
Keywords: STM; molecules on surfaces; molecular rotors; molecular manipulation