Dresden 2020 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 7: Focus Session: Functional Molecules at Surfaces I
O 7.4: Hauptvortrag
Montag, 16. März 2020, 11:15–11:45, TRE Ma
Surface templating in on-surface synthesis: Directing the reaction pathway — Antje Kutz1, Md Taibur Rahman2, Ville Haapasilta3, Chiara Venturini4, Ralf Bechstein2, André Gourdon4, Adam S. Foster3, and •Angelika Kühnle2 — 1Johannes Gutenberg University Mainz — 2Bielefeld University — 3Aalto University — 4CNRS, CEMES, Toulouse
On-surface synthesis constitutes a very promising strategy for creating stable functional structures on surfaces. In the past, classical reactions known from solution synthesis have been transferred onto surfaces. Due to the presence of the surface, on-surface synthesis provides the potential of directing the reaction pathway in a manner that might not be accessible in classical solution synthesis. In particular, on-surface polymerization has been discussed for creating electrical contacts in future molecular electronic devices, for which electrically insulating substrates are desired. In this talk, we present evidence for an acetylene polymerization from a terminal alkyne monomer deposited onto the (10.4) surface of the bulk insulator calcite. Moreover, the terminal alkyne forms homo-coupled dimers on the surface. Although the dimer is present, we find no indication for diacetylene polymerization. This is in sharp contrast to what is observed when directly depositing the dimers. Our work thus constitutes a demonstration for controlling the specific reaction pathway in on-surface synthesis by the presence of the surface.