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O: Fachverband Oberflächenphysik

O 45: Organic molecules on inorganic substrates: Adsorption and growth – Poster

O 45.5: Poster

Dienstag, 10. März 2026, 14:00–16:00, P2

Adsorption, Dissociation and Chain Formation of 2NHC-azo-iPrl on Au(111) — Ebru Cihan¹, Natasha Khera¹, Franz Plate¹, Ningwei Sun², Soyoung Park^2,3, Franziska Lissel^2,3, and •Francesca Moresco¹ — ¹Center for Advancing Electronics Dresden, TU Dresden, Dresden, Germany — ²Institute of Macromolecular Chemistry Leibniz Institute of Polymer Research, Hohe Strasse 6, Dresden, Germany — ³Institute for Applied Polymer Physics, TU Hamburg, Hamburg, Germany

In this study, we investigated 2NHC-azo-iPrl molecules on the Au(111) surface. While the central azobenzene core is clearly visible in STM images, in most cases, only two isopropyl groups are present per molecule. Our results indicate the possibility of a reaction between I- counterions and the isopropyl (iPr) side groups, which may lead to the dissociation of iPrI upon heating. Furthermore, experiments using STM lateral manipulation, which facilitate the separation of chain structures on azobenzene bridges, suggest that the chains are likely connected to each other by weak van der Waals or hydrogen bonds. Additionally, to further investigate the azobenzene core of the molecule, voltage pulses were applied to the molecule using the STM tip. This investigation reveals the potential for cis-trans isomerization in the azobenzene core.

Keywords: Scanning tunneling microscopy; N-heterocyclic carbenes; Adsorption; Chain formation