Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 68: Focus Session Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation IV
O 68.9: Invited Talk
Wednesday, March 19, 2025, 17:00–17:30, H24
On-Surface Synthesis of Porphyrins and BN-Substituted Carbon Scaffolds — •Willi Auwärter — Technical University of Munich, Garching, Germany
On-surface synthesis protocols provide elegant routes to individual molecular complexes, oligomers, and other carbon-based nanomaterials on metal supports [1]. The resulting structural, physical, and chemical properties can be controlled by heteroatom-substitution. The talk will report on our activities employing thermally induced reactions on coinage metal surfaces, affording heteroatom-doped porphyrins and BN-substituted carbon scaffolds. Specifically, a route to peripherally O-doped porphyrins is addressed [2]. Furthermore, we will discuss the use of functionalized borazine precursors yielding covalent carbon networks with (BN)3 motifs. These include random sheet-like BNC structures [3], which can be transferred to Si waver dices, and covalent organic frameworks (COFs) on Ag(111) and Au(111). The comprehensive characterization by scanning probe microscopy, complemented by theoretical modelling, reveals that COFs with distinct (BN)3 densities, pore sizes, and electronic structures can be achieved. The findings open pathways to new O- and BN-substituted carbon-based nanoarchitectures on surfaces. [1] Grill, L.; Hecht S. Nat. Chem. 12, 115 (2020). [2] Deyerling, J. et al. Angew. Chem. Int. Ed., e202412978 (2024). [3] Tömekce et al., Chem. Eur. J., e202402492 (2024).
Keywords: on-surface synthesis; porphyrin; carbon nanostructures; heteroatom substitution; scanning probe microscopy