Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 55: Poster Wednesday: Organic Molecules at Surfaces 2

O 55.1: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P4

Self-assembly and debromination of a functionalized borazine on Ag(111) — •Birce Sena Tömekce¹, Marc G. Cuxart¹, Martina Crosta², Marco Franceschini², Daniele Poletto², Davide Bonifazi², and Willi Auwärter¹ — ¹Physics Department E20, Technical University of Munich, Germany — ²Institute of Organic Chemistry, University of Vienna, Austria

On-surface synthesis is a promising route towards the generation of doped graphene nanoarchitectures with tunable electronic properties [1]. To fabricate atomically precise hybrid BNC materials, distinct precursors incorporating BN units can be used [2]. In this study, we employed a precursor with a borazine core and Br and OH functionalization. We report on a low-temperature scanning tunneling microscopy/spectroscopy and X-ray photoelectron spectroscopy characterization of well-ordered phases of this precursor on Ag(111). At low temperatures, the molecules adsorb intact. At moderate temperatures, debromination is activated and the self-assembly of a chiral kagomé lattice coexisting with a hexagonal packing is observed. At elevated temperatures, completion of cyclodehydrogenation leads to full planarization of the molecules, followed by covalent intermolecular coupling, thereby forming random BNC-based networks. We further investigated the electronic structure of the kagomé lattice on the single molecule level. Our findings constitute a step towards exploiting the structural and electronic properties of BNC architectures.

[1] R. Pawlak et al., Angew. Chem. Int. Ed. 2021, 60, 8370-8375

[2] C. Sánchez-Sánchez et al., ACS Nano. 2015, 9, 9228-9235