Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 51: Poster Session - Metal Substrates: Adsorption and Reaction of Small Molecules

O 51.3: Poster

Dienstag, 17. März 2020, 18:15–20:00, P2/1OG

Fusion of alkyl groups to form phenyl rings: a new on-surface reaction — •Amogh Kinikar1, Marco Di Giovannantonio1, Josè Ignacio Urgel1, Kristjan Eimre1, Carlo Pignedoli1, Xiao-Ye Wang2, Zijie Qiu2, Akimitsu Narita2, Klaus Müllen2, Pascal Ruffieux1, and Roman Fasel11Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, 8600, Switzerland — 2Max Planck Institute for Polymer Research, Mainz, 55128, Germany

On-surface synthesis allows for the design of carbon nanostructures such as graphene nanoribbons with atomic precision. However, the variety of conceivable structures critically depends on the number of available reactions. Here, we present a new surface-assisted reaction allowing for the controlled fusion of two alkyl groups to form a phenyl ring mediated by the activation of alkyl C-H bonds under ultra-high vacuum conditions. Scanning tunneling and non-contact atomic force microscopy images at different stages of the reaction along with DFT simulations allow us to elucidate the reaction mechanism. Furthermore, we study the influence of surface templating by comparing the reaction on Au(111) and Au(110). The selective formation of phenyl rings by the on-surface fusion of alkyl groups is unprecedented, and introduces a powerful new motif for the design of novel carbon nanomaterials while furthering our understanding of the reactive nature of the alkyl C-H bonds.

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