Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 8: Focus Session Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation I

O 8.2: Vortrag

Montag, 17. März 2025, 11:00–11:15, H24

On-surface molecular recognition driven by chalcogen bonding — •Luca Camilli — University of Rome Tor Vergata

The manipulation of organic architectures on surfaces through supramolecular interactions has been achieved by using, for example, H- and halogen-bonding. Chalcogen bonding interactions (ChBIs), which belongs to the same category, have not. The interest in ChBIs relies on its orbital mixing nature that provides semiconducting properties to the assemblies.[1] Here, we combine scanning tunnelling microscopy measurements and quantum chemistry calculations to present the first example of ChBI-driven molecular self-assembly on metal surfaces.[2] We show that pyrene-based modules bearing chalcogenazole pyridine moieties undergo self-assembly into dimers through double Ch***N interactions on Au(111) and Ag(110). Synchrotron-based spectroscopy techniques are used to gain more insights into the chemistry of the ChBI and to reveal its fingerprint [unpublished data]. Finally, experimental scanning tunnelling spectroscopy and its simulations based on the framework of density functional theory are used to investigate the electronic properties of the self-assembled systems [unpublished data]. This study sheds light on a promising avenue for future research in the bottom-up engineering of two-dimensional monolayered supramolecular chalcogenide-type materials, as we delve into the novel role of ChBIs in surface-based molecular recognition.

References 1. D. Romito et al. Angew. Chem. Int. Ed. 2022, 61 (38), e202202137. 2. L. Camilli, et al. JACS Au 4, 2115 (2024)

Keywords: chalcogen bonding; self-assembly; low-temperature scanning tunnelling microscopy