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O: Fachverband Oberflächenphysik
O 34: Poster Session III: Organic molecules on inorganic substrates: Adsorption and growth III
O 34.7: Poster
Tuesday, March 2, 2021, 10:30–12:30, P
Asymmetric cyclotrimerization of terminal alkenes on Au(111) — •Mirunalini Devarajulu1, Kevin Dhamo2, Konstantin Amsharov3, Bernd Meyer2, and Sabine Maier1 — 1Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg — 2Interdisciplinary Center for Molecular Materials (ICMM) and Computer-Chemistry-Center (CCC), Friedrich-Alexander-Universität Erlangen-Nürnberg — 3Institute for Chemistry, Martin Luther University of Halle-Wittenberg
Most branched, crosslinked, and networked polyphenylene polymers that have been assembled on metal surfaces via on-surface synthesis are non-conjugated because they contain metaphenylene units. In contrast, the on-surface synthesis of conjugated orthophenylene units remained so far elusive as rare by-products.
Here, we demonstrate the on-surface synthesis of conjugated 1,2,4-triphenylbenzenes via selective asymmetric cyclotrimerization of terminal alkenes on Au(111). We provide a detailed analysis of the reaction intermediates and final products via dehydrogenative homocoupling of terminal alkenes of linear 4-vinyl-1,1’-terphenyl molecules on Au(111) using low-temperature scanning tunneling microscopy in combination with density functional theory.