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Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 6: Nanostructures at Surfaces 1

O 6.4: Talk

Monday, September 5, 2022, 11:15–11:30, S052

Host guest chemistry and supramolecular doping in triphenylamine-based covalent frameworks on Au(111)Christian Steiner1, Lukas Fromm2, Julian Gebhardt2, Yi Liu1, Alexander Heidenreich2, Natalie Hammer2, •Hexia Shi1, Andreas Görling2, Milan Kivala3, and Sabine Maier11Department of Physics, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany — 2Department of Chemistry and Pharmacy, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany — 3Organisch-Chemisches Institut & Centre for Advanced Materials, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany

We report the host-guest interaction in triphenylamine-based covalently-linked macrocycles and networks on Au(111) using low-temperature scanning tunneling microscopy in combination with density-functional theory. Triphenylamine precursors formed macrocycles and 2D networks featuring carbonyl- and hydrogen-functionalized pores, creating preferred adsorption sites for trimesic acid (TMA) and halogen atoms. TMA binds through hydrogen bonds to the carbonyl sites while halogens selectively adsorb between two carbonyl groups at Au hollow sites. Band structure calculations reveal that TMA adsorption reduces the electronic band gap of the triphenylamine covalent frameworks due to charge transfer, while the interaction of the halogens leads to a slight downshift of the bands.[1].

[1] Steiner, C. et al. Nanoscale, 2021, 13, 9798-9807.

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