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O: Fachverband Oberflächenphysik

O 31: Poster: Organic Molecules on Inorganic Substrates

O 31.1: Poster

Dienstag, 19. März 2024, 18:00–20:00, Poster C

Probing Borazine on Au(111): from single molecules to clusters — •Matthias Zeilerbauer, Marco Thaler, and Laerte Patera — Department of Physical Chemistry, University Innsbruck, Austria

Borazine is the isoelectronic and isostructural inorganic analogue of benzene. However, due to the large difference in electron negativity between N and B most of the charge is drawn by the nitrogen atom, which is expected to lead to polarized B-N bonds. Here, we demonstrate borazine dosing on Au(111) exploiting a cold trap, which removes borane impurities from the gas phase [1]. Upon deposition on Au(111) at 25 K, we observed monomers as well as self-assembled clusters in various sizes, exhibiting a preferential orientation with respect to the substrate. In scanning tunneling microscopy images borazine molecules present a three-fold appearance, being attributed to the different radii of B and N. Despite the high polarity of borazine favoring dipole-dipole mediated intermolecular interactions, the molecules in the clusters are typically surrounded by hydrogen molecules. Spatially resolved tunneling spectroscopy provides maps of the inelastic electron tunneling probability, allowing for the identification of the hydrogen structures. [1] Marc G. Cuxart et al. Sci. Adv.7 2021