Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 114: Nanostructures at surfaces: 1D and 2D structures and networks IV

O 114.1: Vortrag

Freitag, 16. März 2018, 10:30–10:45, MA 141

Terminal Alkyne Coupling on a Corrugated Noble Metal Surface: From Controlled Precursor Alignment to Selective Reactions — •Tao Lin¹, Liding Zhang¹, Jonas Börk², Zhi Chen³, Mario Ruben^3,4, Johannes Barth¹, and Florian Klappenberger¹ — ¹Physik-Department E20, Technische Universität München James-Franck-Str., 85748 Garching (Germany) — ²Department of Physics, Chemistry, and Biology (IFM), Linköping University 58183 Linköping (Sweden) — ³Institute of Nanotechnology, Karlsruhe Institute of Technology 76344 Eggenstein-Leopoldshafen (Germany) — ⁴IPCMS-CNRS University de Strasbourg 23 Rue de Loess, 67034 Strasbourg (France)

Surface-templated covalent coupling of organic precursors currently emerges as a promising route to the atom-precise fabrication of low-dimensional carbon materials. Here, we investigate the adsorption and coupling reactions of 4,4''-diethynyl-1,1':4',1''-terphenyl on Au(110) under UHV conditions by using scanning tunneling microscopy combined with density functional theory and kinetic Monte Carlo calculations[1]. Annealing induces both 1,2,4 asymmetric cyclotrimerization and homo-coupling, resulting in various reaction products including a previously unreported, surface-templated H-shaped pentamer. Further Analysis of the temperature dependent relative product abundances unravels that 1,2,4-trimerization and homocoupling proceed via identical intermediate species with final products depending on the competition of coupling to a third monomer vs. dehydrogenation. [1] Lin et al., Chem. Eur. J. 2017, 23, 15588.