Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 62: Surface Reactions and Heterogeneous Catalysis 1

O 62.8: Vortrag

Donnerstag, 8. September 2022, 12:15–12:30, H4

Selectivity in single-molecule reactions by tip-induced redox chemistry — •Florian Albrecht¹, Shadi Fatayer^1,2, Iago Pozo³, Ivano Tavernelli¹, Jascha Repp⁴, Diego Pena³, and Leo Gross¹ — ¹IBM Research - Zurich, 8803 Rüschlikon (Switzerland) — ²Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal (Saudi Arabia) — ³Centro Singular de Investigación en Química Biolóxica e MateriaisMoleculares (CiQUS) and Departamento de Química Orgμnica, Universidade de Santiago de Compostela, 15782 Santiago de Compostela (Spain) — ⁴Institute of Experimental and Applied Physics, University of Regensburg, 93053 Regensburg (Germany)

Since the first experiments by S.-W. Hla in 2000 [1], tip-induced on-surface synthesis is an active field. Not only in on-surface chemistry, selective control over the outcome of a reaction is a major quest. Here, we activate a molecule adsorbed on ultrathin insulating films by dehalogenation and perform selective constitutional isomerization reactions in a low temperature UHV combined STM and AFM. The selectivity is controlled by the polarity and amplitude of applied voltage pulses. The insulating films stabilize the isomers in different charge states and allow for their characterization. The importance of molecular charge state on the reaction is supported by DFT-derived isomerization energy landscape. [1] S.-W. Hla et al., Phys. Rev. Lett. 85, 2777 (2000).