Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 20: Focus Session: Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation I
O 20.1: Topical Talk
Dienstag, 19. März 2024, 10:30–11:00, HE 101
Generation and Characterization of Cyclocarbons — Florian Albrecht1, Igor Roncevic2, Yueze Gao2, Fabian Paschke1, Shantanu Mishra1, Harry L. Anderson2, and •Leo Gross1 — 1IBM Research Europe - Zurich, Rüschlikon, Switzerland — 2Oxford University, Oxford, United Kingdom
The family of carbon allotropes was expanded by tip-induced synthesis and on-surface characterization of cyclo[N]carbons, molecular rings composed of N carbon atoms [1-3]. Cyclocarbons possess two orthogonal delocalized pi-systems and can undergo different Jahn-Teller distortions rendering them excellent systems for benchmarking theory [4-6]. Even-N cyclocarbons can be doubly aromatic [1,3] or doubly anti-aromatic [2], and can exhibit polyynic [1,2] or cumulenic [3] structures. Odd-N cyclocarbons [5,7] do not allow a symmetric polyynic structure, might be open-shell systems, and will be discussed in the talk.
References: [1] K. Kaiser et al. Science 365, 1299-1301 (2019). [2] Y. Gao. et al. Nature 623, 977-981 (2023). [3] L. Sun, et al. Nature 623, 972-976 (2023). [4] G. V. Baryshnikov et al. J. Phys. Chem. A 124, 10849-10855 (2020). [5] G. V. Baryshnikov et al. J. Phys. Chem. A 126, 2445-2452 (2022). [6] I. Rončevic et al. (2023) 10.26434/chemrxiv-2023-8kc5t-v2. [7] F. Albrecht et al. (2023) 10.26434/chemrxiv-2023-ddrh7.
Keywords: tip-induced chemistry; cyclocarbon; carbon allotropes; on-surface synthesis; high-resolution AFM