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O: Fachverband Oberflächenphysik

O 90: Poster Session VII: Surface reactions I

O 90.3: Poster

Donnerstag, 4. März 2021, 10:30–12:30, P

Intramolecular Coupling of Terminal Alkynes by Atom Manipulation — •Florian Albrecht¹, Dulce Rey², Shadi Fatayer¹, Fabian Schulz¹, Dolorez Perez², Diego Pena², and Leo Gross¹ — ¹IBM Research - Zurich, Switzerland — ²CiQUS and Departamento de Quimica Organica Universidade de Santiago de Compostela, Spain

Performing chemical reactions in a scanning probe microscope offers ultimate control over the reaction. The characterization of both, reactant and product, can be performed. Functionalizing the tip of an AFM enables elucidation of molecular geometries down to the atomic level [1] and performing the reaction on ultra-thin insulating films decouples the molecules sufficiently to characterize their electronic structure [2].

Here, we show a Glaser-like coupling reaction of terminal alkynes within individual molecules. Voltage pulses from the tip initiate the reaction and geometric as well as electronic structure of reactant and product are characterized on bilayer NaCl on Cu(111). The observation of partially dehydrogenated reaction intermediates provides insight into the reaction pathway [3].

References: [1] L. Gross, et al. Science 325, 1110 (2009) [2] J. Repp, et al. Phys. Rev. Lett. 94, 026803 (2005) [3] F. Albrecht, et al. Angew. Chem. Int. Ed. 59, 22989 (2020)