Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 25: Organic Molecules on Inorganic Substrates III: Adsorption & Growth

O 25.7: Vortrag

Dienstag, 19. März 2024, 12:00–12:15, MA 043

Passivation of a metal surface strengthens the binding of an N-heterocyclic carbene to a metalloporphyrin pedestal — •Dennis Meier¹, Peter Knecht¹, Peter Feulner¹, Francesco Allegretti¹, Joachim Reichert¹, Johannes V. Barth¹, and Anthoula C. Papageorgiou^1,2 — ¹Technical University of Munich, Germany — ²National and Kapodistrian University of Athens, Greece

The extension of well-ordered 2D self-assemblies to more complex 3D architectures in ultra-high vacuum will bridge the gap between atomically precise supramolecules and extended materials. It is therefore crucial to understand the binding of out-of-plane linker molecules. We recently introduced a strategy to use Ru-porphyrins as pedestals of N heterocyclic carbenes (NHCs) on a metal surface. Here, we present engineering of the Ru-porphyrin metal interface for a significant improvement in the thermal stability of such pedestal systems. The enhanced binding strength is achieved by introducing a layer of O atoms between the Ru porphyrins and the metal surface. We characterize unambiguously the chemical state, structure and thermal stability of NHC molecules adsorbed to Ru octaethyl porphyrin on Cu(110) and Cu(110)-(2x1)O by means of photoelectron spectroscopy, scanning tunneling microscopy and temperature programmed desorption. On Cu(110)-(2x1)O, more extended 2D domains of pedestals and an increment of NHC binding stability by around 130 K was realized.

Keywords: porphyrins; Cu(110)-(2x1)O; scanning tunneling microscopy; carbenes