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MM: Fachverband Metall- und Materialphysik
MM 17: Topical session: In-situ Microscopy with Electrons, X-Rays and Scanning Probes in Materials Science I
MM 17.4: Talk
Tuesday, March 8, 2016, 11:30–11:45, H38
Self-assembly of an imidazole-based ligand on Au(111) and on Cu(111) — •Patrick Seitz1, Nico Fritsch2, Thomas Waidmann2, Nicolai Burzlaff2, and Sabine Maier1 — 1Department of Physics, FAU Erlangen-Nürnberg, Germany — 2Department of Chemistry and Pharmacy, FAU Erlangen-Nürnberg, Germany
Imidazole-based ligands are versatile building blocks to form one-dimensional coordination polymers on surfaces [1,2]. In this work, the self-assembly and conformation of 1,2-bis(N-methylimidazol-2-yl)ethylene ligands on Au(111) and Cu(111) was studied using low temperature scanning probe microscopy (STM) in ultra-high vacuum. The subtle balance between intermolecular and molecule-surface interactions determines, whether the molecules adsorb as cis- or trans-isomers. On Au(111), the molecules interact with one another through hydrogen bonds. We observe dimers and trimers formed from cis-isomers while trans-isomers self-assemble in one-dimensional chains at submonolayer and two-dimensional islands at monolayer coverage. In contrast, the molecules preferably adsorb as monomers on Cu(111) owing to a strong molecule-surface interaction. [1] Fischer et al., Chemistry - A European Journal, 2011, 17 (34), 9293-9297 [2] Fritsch et al., Inorganic Chemistry, 2014, 53 (23), 12305.