期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 25, 期 16, 页码 4031-4035出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201804918
关键词
boron; boron-based diradicals; diradicals; EPR spectroscopy; self-assembly; SQUID measurements
资金
- National Key R&D Program of China [2016YFA0300404, 2018YFA0306004]
- National Natural Science Foundation of China [21525102, 21690062, 21601082]
- Fundamental Research Funds for the Central Universities [14380134, 020514380152]
- China Postdoctoral Science Foundation [2018M632280]
Two novel boron-centered diradicals based on dimesitylpyridine borane (1) were synthesized by the self-assembling of the corresponding radical sodium and potassium salts, respectively. The sodium diradical was obtained by re-dissolving the crystals of the radical salt 1Na in toluene, while the potassium diradical was directly obtained by the reduction of 1 with potassium in THF. The diradicals could be converted back to their radical anions in THF solution, forming a reversible process. EPR spectroscopy and SQUID measurements, together with theoretical calculations, show that the diradicals have singlet ground states with excited triplet states. Their singlet-triplet energy gaps are tunable with metals.
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