SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 66: Poster: Scanning Probe Microscopy with Quartz Sensors
O 66.1: Poster
Mittwoch, 29. März 2023, 18:00–20:00, P2/EG
Atomically Precise Synthesis and Characterization of Heptauthrene with Triplet Ground State — Xuelei Su1, Can Li2, •Qingyang Du1, Kun Tao3, Shiyong Wang2, and Ping Yu1 — 1School of Physical Science and Technology, ShanghaiTech University, 201210 Shanghai, China — 2Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy and Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China — 3Key Lab for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, 730000 LanZhou, China
Heptauthrene, one of the most well-known structures, is a benzene-fused bisphenalenyls in mirror symmetry with triplet ground state. However, it is difficult to synthesize heptauthrene without any substituents due to its high activity. Owing to the development of on-surface synthesis, it is possible to obtain highly active species with properly-designed precursors. Here, we combined in-solution and on-surface synthesis to achieve unsubstituted heptauthrene, whose chemical structure can be characterized with bond-resolved atomic force microscopy. Its triplet ground state is clearly confirmed by the Kondo resonance around zero bias in dI/dV spectra. The response of this Kondo peak to external magnetic field is also detected to verify the high-spin state. We also engineered its spin-state through hydrogen atom addition or dissociation by tip manipulation. Our work provides access to phenalenyl-based structures with high-spin ground states, potentially useful in constructing spin networks.