Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 17: Poster Focus Session Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation
O 17.7: Poster
Montag, 17. März 2025, 18:00–20:00, P2
Reaction intermediates, organometallic polymers and graphene nanoribbons in on-surface Ullmann-type coupling on coinage metals — R.S. Koen Houtsma1, Jeanne van Zuilen1, Floris van Nyendaal1, Mihaela Enache1, and •Meike Stöhr1,2,3 — 1University of Groningen, Netherlands — 2Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany — 3University of Applied Sciences of the Grisons, Switzerland
Ullmann-type coupling has been so far the most often employed on-surface reaction for the controlled fabrication of molecular nanoarchitectures in a bottom-up manner. For the case of the prochiral precursor molecule 6,12 dibromochrysene, we compared the influence of substrate material/orientation, annealing temperature and reaction conditions on the reaction outcome. While on Au(111) achiral chevron-type graphene-nanoribbons are formed [1], on Cu(111), Ag(111) [2] and Ag(110) [3] only 1D organometallic polymers were obtained. These 1D polymers are homochiral when Cu(111) was used as substrate whereas they were heterochiral on Ag(111). In the case of Ag(110), their chirality could be even steered via the reaction conditions. With the help of reaction intermediates observed on Ag(111), we obtained key insights into the formation process of the organometallic polymers which is based on the breaking and re-establishing of C-Ag bonds. References: [1] R.S.K. Houtsma et al., Nanoscale Adv. 2022, 4, 3531. [2] R.S.K. Houtsma et al., Adv. Mater. Interfaces 2024, 11, 2300728. [3] R.S.K. Houtsma et al., Commun. Chem. 2024, 7, 51.
Keywords: On-surface synthesis; Ullmann coupling; Scanning tunneling microscopy; Metal coordination