Dresden 2026 – wissenschaftliches Programm
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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 Park2,3, Franziska Lissel2,3, 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