Surface Chemistry of a Halogenated Borazine: From Supramolecular Assemblies to a Random Covalent BN‐Substituted Carbon Network
(2024) Chemistry: A European Journal — Vol. 30, n° 69, p. 1-9 (2024)
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Sena Tömekce, Birce 
Cuxart, Marc G. Caputo, Laura Poletto, Daniele Auwärter, Willi
- Abstract
- The on-surface synthesis strategy has emerged as a promising route for fabricating well-defined two-dimensional (2D) BNsubstituted carbon nanomaterials with tunable electronic properties. This approach relies on specially designed precursors and requires a thorough understanding of the on-surface reaction pathways. It promises precise structural control at the atomic scale, thus complementing chemical vapor deposition (CVD). In this study, we investigated a novel heteroatomic precursor, tetrabromoborazine, which incorporates a BN core and an OH group, on Ag(111) using low temperature scanning tunnelling microscopy/spectroscopy (LT-STM/STS) and X-ray photoelectron spectroscopy (XPS). Through sequential temperature-induced reactions involving dehalogenation and dehydrogenation, distinct tetrabromoborazine derivatives were produced as reaction intermediates, leading to the formation of specific self-assemblies. Notably, the resulting intricate supramolecular structures include a chiral kagomé lattice composed of molecular dimers exhibiting a unique electronic signature. The final product obtained was a random covalent carbon network with BN-substitution and embedded oxygen heteroatoms. Our study offers valuable insights into the significance of the structure and functionalization of BN precursors in temperature-induced on-surface reactions, which can help future rational precursor design. Additionally, it introduces complex surface architectures that offer a high areal density of borazine cores.
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Citations
Sena Tömekce, B., Cuxart, M. G., Caputo, L., Poletto, D., Charlier, J.-C., Bonifazi, D., & Auwärter, W. (2024). Surface Chemistry of a Halogenated Borazine: From Supramolecular Assemblies to a Random Covalent BN‐Substituted Carbon Network. Chemistry: A European Journal, 30(69), 1-9. https://doi.org/10.1002/chem.202402492 (Original work published 2024)