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O: Fachverband Oberflächenphysik
O 73: Organic Molecules on Inorganic Substrates V: Adsorption, Growth and Networks
O 73.11: Vortrag
Mittwoch, 18. März 2020, 17:45–18:00, TRE Phy
Molecular arrangement discloses intermolecular interactions: The case of 1D structure formed by 3-hydroxybenzoic acid on calcite(10.4) — •Maximilian Vogtland1, Christoph Schiel2, Jonas Staude1, Julia Neff1, Hagen Söngen1, Philipp Maass2, Ralf Bechstein1, and Angelika Kühnle1 — 1Universität Bielefeld, Deutschland — 2Universität Osnabrück, Deutschland
Molecular self-assembly constitutes a convenient way to create molecular structures at surfaces. In the past, the focus of controlling the structure has been on attractive interactions, while repulsive interactions have been explored only rarely. Our group has investigated the self-assembly of benzoic acid derivatives with dynamic atomic force microscopy (AFM) at room temperature on calcite (10.4). Here, we focus on 3-hydroxybenzoic acid (3-HBA) that forms a 1D (striped) structure. The obtained next-neighbour stripe distance distributions differ substantially from what is expected for randomly placed, non-interacting stripes. These distance distributions have been explained by a long-range repulsion of adsorption induced dipoles. On the other hand, the stripe length distribution is a result of short-range attractive and long-range repulsive forces. We show how to extract the strength of repulsive and attractive interactions between the 3-HBA molecules by combining the information from length and distance distributions. In the future, we want to compare with other 1D structures, e.g., 3-aminobenzoic acid on calcite(10.4). We believe that tuning repulsive interactions is a powerful tool to influence molecular structure formation on bulk insulator surfaces.