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O: Fachverband Oberflächenphysik
O 69: Nanostructures at surfaces:1D, 2D, networks – Poster
O 69.10: Poster
Mittwoch, 11. März 2026, 18:00–20:00, P2
Towards on-surface synthesis of helicene chains — •Jung-Ching Liu1, Miguel Gavara1, Kévin Martin2, Narcis Avarvari2, Karl-Heinz Ernst3,4,5, and Johannes Barth1 — 1Department of Physics, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany — 2University of Angers, CNRS, MOLTECH-Anjou, SFR MATRIX, 49000 Angers, France — 3Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland — 4Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10, 16200 Prague 6, Czech Republic — 5Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
Helicenes are polycyclic aromatic helical compounds which have been investigated at surfaces regarding their spin selectivity due to their chirality and potential use in organic spintronics. To enhance chirality-induced spin selectivity, extended helicene chains are of interest. However, fabrication of such helicene chains has not yet been reported. Here, we present atomically precise dibromohexahelicene chain formations on Au(111). Investigated by STM and bond-resolving nc-AFM at 4K, we found self-assembled supramolecular clusters at low coverage. Coupling reactions occur as the annealing temperature reaches 330C. By further annealing to 380C, short segments of planar structures are found along with 3D chains. The findings indicate potential nanographenes formation, tentatively ascribed to a Diels-Alder pathway. Our study provides insights into extended on-surface synthesis using non-planar molecular precursors.
Keywords: on-surface reaction; helicene; low-temperature scanning probe microscopy; non-contact AFM