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O: Fachverband Oberflächenphysik
O 17: Poster Focus Session Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation
O 17.5: Poster
Montag, 17. März 2025, 18:00–20:00, P2
Steering intermolecular interaction and ordering of N-heterocyclic carbenes on metal surfaces — •Duong Tran1,2, Philipp Wiesener1,2, Lacheng Liu1,2, Ankita Das3, Alex-Cristian Tomut4, Nikos Doltsinis4, Frank Glorius3, Harald Fuchs1,2, and Harry Mönig1,2 — 1Physikalisches Institut, Universität Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany — 2Center for Nanotechnology, Heisenbergstraße 11, 48149 Münster, Germany — 3Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, 48149 Münster, Germany — 4Institut für Festkörpertheorie, Universität Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany
N-Heterocyclic carbenes (NHCs) are established ligands for the chemical and electronic functionalization of surfaces and nanoparticles. Controlling their nucleation and aggregation mechanisms provides valuable opportunities to tune their catalytic- and electro-optical properties. In the present work, we investigate the effect of hydroxyl-side groups on the self-assemblies of IMes on Au(111) and Ag(111) substrates by scanning tunneling microscopy with sub-molecular resolution. Our results are complemented by X-ray photoelectron spectroscopy (XPS) and first-principles calculations. We find that the OH groups can drastically enhance the molecular order, especially on the Ag(111) substrate where extended 2D networks are found. Our findings are essential for robust NHC-based supramolecular networks with tailored properties.
Keywords: N-heterocyclic carbenes (NHCs); STM; XPS; first-principle calculation; catalysis