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O: Fachverband Oberflächenphysik
O 35: Organic molecules on inorganic substrates: Adsorption and growth II
O 35.3: Talk
Tuesday, March 10, 2026, 11:00–11:15, HSZ/0401
Validation of the Rotational Degrees of Freedom in Azobenzene Subphthalocyanine — •Dominik Volavka1, Wyatt Highland1, Bartosz Szczefanowicz1, Rebecci Samuele1, Roberto Robles2, Nicolas Lorente2, Meike Stöhr1,3, and Sabine Maier1 — 1Department of Physics, Friedrich-Alexander Universität Erlangen-Nürnberg, Germany — 2Centro de Física de Materiales (CSIC-UPV/EHU), Donostia-San Sebastián, Spain — 3University of Applied Sciences of the Grisons, Switzerland
Azobenzene mounted on Subphthalocyanine (Azo-SubPC) via a single covalent oxygen bond is predicted to exhibit interesting rotational and switching properties due to the single bonding character of the boron-oxygen-carbon. Recent attempts at observing these rotational actions through scanning tunneling microscopy were hindered because of the self-assembling nature of Azo-SubPC when deposited on Au(111) and Ag(111). In each case, one-dimensional arrangements of Azo-SubPC formed, wherein molecules were neighbored by additional Azo-SubPC molecules on both sides. The resulting configuration of the molecules thusly led to a high steric hindrance and ultimate restriction of Azo-SubPC's anticipated rotational degree of freedom. Alternative preparation methods of Azo-SubPC are herein proposed and evaluated in the attempt of depositing and identifying isolated Azo-SubPC molecules with preserved rotational freedom. Isolated Azo-SubPC molecules can give insight into the underlying principles dictating the mechanisms of rotation in rotor molecules.
Keywords: STM; molecular manipulation; self-assembly