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O: Fachverband Oberflächenphysik
O 6: Organic molecules on inorganic substrates: Adsorption and growth I
O 6.2: Vortrag
Montag, 9. März 2026, 10:45–11:00, TRE/PHYS
LT-STM investigation of azulene-based molecular architectures on metal surfaces — •Suchetana Sarkar1, 4, Natasha Khera1, Kwan Ho Au-Yeung1, 5, Renxiang Liu1,2,3, Ji Ma1,2,3, Xinliang Feng1,2,3, and Francesca Moresco1 — 1Center for Advancing Electronics Dresden, TU Dresden, 01062 Dresden, Germany — 2Chair of Molecular Functional Materials and Faculty of Chemistry & Food Chemistry, TU Dresden, 01062 Dresden, Germany — 3Max Planck Institute of Microstructure Physics, Weinberg 2, Halle, Germany — 4Present address: Department of Chemistry, Philipps-Universität Marburg, 35032 Marburg, Germany — 5Present address: Physikalisches Institut, Karlsruhe Institute of Technology, Karlsruhe, Germany
Azulene-based molecules offer a unique platform for probing on-surface self-assembly and electronic structure due to their non-benzenoid topology and intrinsic dipole. Presented here are the investigations of two related systems: a cyclopenta[cd]azulene trimer (CPAT) and a phenyl-functionalized analogue (CPAT-Ph), using low-temperature scanning tunneling microscopy and spectroscopy. CPAT forms well-ordered homochiral domains on Au(111), whereas CPAT-Ph exhibits weak adsorption and high mobility on Au(111) and shows no ordered phases on Cu(110). Spectroscopy reveals clear electronic differences between the molecules and substrate-induced shifts for CPAT-Ph. Finally, the results of thermally induced ring-closing reactions are also shown, discussing routes toward on-surface synthesis of non-benzenoid nanographenes.
Keywords: LT-STM; Homochiral; Adsorption; Organic