Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 78: Poster Session - Focus Session: Functional Molecules at Surfaces - Motion and Intramolecular Processes

O 78.3: Poster

Wednesday, March 18, 2020, 18:15–20:00, P2/EG

Covalent-Coupling Reaction of Aromatic Aldehyde on Ag(111) — •Nan Cao, Maryam Ebrahimi, Alexander Riss, Aleksandr Baklanov, Knud Seufert, Eduardo Corral Rascon, Willi Auwärter, and Johannes V. Barth — Physics Department E20, Technical University of Munich, D-85748 Garching, Germany

Surface-confined reactions offer a promising pathway for the controlled synthesis of two-dimensional (2D) molecular networks. The 2D structures can be further characterized at an atomic scale resolution using scanning probe microscopy techniques. Within the last decade, many organic reactions have been investigated on metal single crystal surfaces, for examples, Ullmann-coupling, Glaser-coupling, and Schiff-base condensation. Here, we report on a new coupling reaction of aromatic aldehyde molecules on Ag(111) under ultrahigh vacuum conditions. The deposition of aldehyde reactants on Ag(111), following a post-annealing treatment, resulted in the formation of an polymeric network. Our atomic force microscopy and scanning tunnelling microscopy data indicate the linkage of aldehyde groups in the periphery of the reactants. Furthermore, we propose a reaction pathway enriched from our complementary X-ray photoelectron spectroscopy and density functional theory calculations data. Our data suggest on an unprecedented on-surface reaction strategy for designing novel 2D polymers.