期刊
NANO LETTERS
卷 20, 期 9, 页码 6859-6864出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02939
关键词
nanographene; heptauthrene; diradical; phenalenyl; triplet state; scanning tunneling microscopy
类别
资金
- National Natural Science Foundation of China [11874258, 11790313, 11704250]
- ShanghaiTech start-up funding
- Shanghai Municipal Science and Technology Q Ming Xing Project [20QA1405100]
- Fok Ying Tung Foundation for young researchers
- Analytical Instrumentation Center, SPST, ShanghaiTech University [SPST-AIC10112914]
By virtue of multitunable spin structures upon designing the p-electron topologies, phenalenyl-based nanographenes are of substantial interest in fundamental science and for potential applications in spintronics. Heptauthrene, as one of the well-known phenalenyl diradicals, is composed of one benzene-fused bisphenalenyls in mirror symmetry and expected to have a triplet ground state. However, the synthesis of unsubstituted heptauthrene remains very challenging due to the high reactivity of triplet diradicals. Here, we report a combined in-solution and on-surface synthesis of unsubstituted heptauthrene, whose chemical structure is characterized through bond-resolved atomic force microscopy. Combined with mean-field Hubbard model calculations, its triplet ground state is unambiguously confirmed by the underscreened Kondo resonance in response to the magnetic field, as well as the engineered spin-state switching upon extra hydrogen atom addition and dissociation on the radical site. Our results provide access to phenalenyl-based nanographenes with high-spin ground state, potentially useful in constructing high-spin networks.
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