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O: Fachverband Oberflächenphysik
O 35: Organic molecules on inorganic substrates: Adsorption and growth II
O 35.1: Vortrag
Dienstag, 10. März 2026, 10:30–10:45, HSZ/0401
Phophangulenes on Au(111): comparing the influence of the environment on single molecule rotation — •Wyatt Highland1, Sajjan Mohammad1, Paul Philip Schmidt1, Roberto Robles2, Milan Kivala3, Nicolas Lorente2, Meike Stöhr1,4, and Sabine Maier1 — 1Department Physik, FAU Erlangen-Nürnberg, Erlangen, Germany — 2CFM/MPC (CSIC-UPV/EHU), Donostia-San Sebastian, Spain — 3Institute of Organic Chemistry, Heidelberg University, Heidelberg, Germany — 4University of Applied Sciences of the Grisons, Switzerland
Bowl-shaped phosphangulenes represent a promising class of rotor molecules for molecular energy-storage applications on surfaces, owing to their fixed rotational axis defined by the central phosphorus atom, which simultaneously serves as the anchoring group on gold substrates. For low coverge, the phosphangulenes stay isolated on Au(111). We examined their adsorption configurations and subsequently, the possibility for rotational motion using both the STM tip and thermal activation as external triggers. At higher coverage, phosphangulenes form compact self-assemblies that suppress their rotational motion. To overcome this, we employ porous, hydrogen-bonded trimesic-acid networks to isolate individual phosphangulenes at the surface. Comparing their rotational dynamics inside and outside the pores allowed to directly reveal the influence of the immediate surroundings on the rotational motion.
Keywords: self-assembly; host-guest interaction; scanning tunneling microscopy; molecular rotors; DFT