Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 58: Organic molecules on inorganic substrates: Adsorption and growth III
O 58.4: Talk
Wednesday, March 11, 2026, 11:15–11:30, TRE/PHYS
Tuning the adsorption of Subphthalocyanine molecules on Au(111) by peripheral and axial functionalization — •Franz Plate1, Soyoung Park2,3, Ebru Cihan1, Natasha Khera1, Ningwei Sun2,3, Dmitry A. Ryndyk1, Franziska Lissel2,3, and Francesca Moresco1 — 1Center for Advancing Electronics Dresden, TU Dresden, 01062 Dresden, Germany — 2Institute of Macromolecular Chemistry Leibniz Institute of Polymer Research, Hohe Strasse 6, Dresden, Germany — 3Institute for Applied Polymer Physics, TU Hamburg, 21073 Hamburg, Germany
Subphthalocyanine (SubPc)-based molecules have been shown to be chemically versatile and tunable molecules, which can be functionalized with a variety of different chemical groups. This makes them promising candidates for designing single molecule machines to store and convert energy. Examples include vertical molecular rotors on surface. Although SubPc is nonplanar, SubPc-based molecules have been shown to form well-ordered molecular assemblies on surfaces, enabling them to function as modular rotor bases. Their chemically stable and rigid core, allows for a functionalization with different axial ligands as well as extensions at the peripheral positions of the π-conjugated base, which leads to different orderings on the surface. We have studied different SubPc based molecules with different axial and peripheral functionalizations on Au(111) using low-temperature scanning tunneling microscopy, supported by simulations. Depending on the peripheral functionalization with methoxy and thiophene groups, we found different adsorption behaviors, ordering, and intermolecular interactions.
Keywords: STM; single molecule machines; vertical molecular rotors; SubPc; adsorption