SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 73: Metal Substrates: Adsorption and Reaction of Small Molecules II
O 73.6: Vortrag
Donnerstag, 30. März 2023, 11:45–12:00, CHE 91
2D chiral crystallization and thermally-induced on-surface polymerization of 2,3-dicarbonitrile-tetrahelicene on Ag(111) surface — •Aleksandra Cebrat1,3, Christian Wäckerlin1, Kevin Martin2, Manfred Parschau1, Narcis Avarvari2, and Karl-Heinz Ernst1,3 — 1Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland — 2Laboratoire Moltech-Anjou, CNRS-Université d'Angers, 49045 Angers, France — 3Department of Chemistry, University of Zurich, 8057 Zürich, Switzerland
The controlled on-surface polymerization using templates like metal surface and non-planar molecules can lead to synthesis of variable phthalocyanines and organic semiconducting polycyanine open-chains. Here, we report the initial results on the 2D chiral crystallization of racemic mixture of 2,3-dicarbonitrile-tetrahelicene on Ag(111) and its thermally-induced surface polymerization. Deposition of racemic diCN[4]H up to 0.9ML coverage on Ag(111) kept at 300 K leads to formation of islands of honeycomb domains built of M- and P-enantiomers. Deposition of rac-diCN[4]H on 330K up to 0.9ML leads to aggregation of molecules into long molecular lines and denser phase of unbalanced domains with either enantiomers present in excess. Subsequent annealing to 420 K leads to partial desorption of molecular lines and formation of single tetramers built from different stereoisomeric subunits. The formation of polymerized species was confirmed ToF-SIMS. Finally, we performed LT-STM lateral manipulation of the tetramers units to affirm the nature of bonds as covalent.