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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 StateXuelei Su1, Can Li2, •Qingyang Du1, Kun Tao3, Shiyong Wang2, and Ping Yu11School 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.

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