Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 64: Gerhard Ertl Young Investigator Award
O 64.3: Vortrag
Donnerstag, 8. September 2022, 11:30–12:00, S051
On-surface synthesis and characterization of cyclo[18]carbon — •Katharina Kaiser1, Lorel Scriven2, Fabian Schulz1, Przemyslaw Gawel2, Leo Gross1, and Harry Anderson2 — 1IBM Research - Zurich, Säumerstrasse 4, 8803 Rüschlikon, CH — 2Department of Chemistry, Oxford University, Chemistry Research Laboratory, Oxford, OX13TA, UK
Cyclo[n]carbons, purely sp-hybridized carbon allotropes with unique structural and electronic properties, have been predicted for decades to exist. Although a synthetic route was already elaborated in the 1980’s, and glimpses of cyclocarbons were detected in gas phase, they could never be stabilized long enough for characterization. A distinctive feature of cyclo[n]carbons is their two conjugated π-systems that can lead to the formation of two orthogonal ring currents and so-called double-aromatic stabilization. However, distortions in the geometry can lead to a lowering in ground state energy, and theoretically predicted ground state structures were found to depend on the level of theory. Consequently, cyclo[n]carbon’s structures remained unknown.
AFM and STM at low temperatures allow triggering certain on-surface chemical reactions by atom manipulation and can thus facilitate the controlled formation of highly reactive molecules on inert surfaces from more stable precursors. Using this approach, we formed cyclo[18]carbon on a thin layer of NaCl. By comparing high-resolution AFM images with a functionalized tip and AFM simulations of different predicted resonance structures, we identified two possible ground state structures of cyclo[18]carbon adsorbed on bilayer NaCl.