期刊
CHEMICAL SCIENCE
卷 11, 期 21, 页码 5565-5571出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0sc00770f
关键词
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资金
- National Natural Science Foundation of China [21925501, 21790363, 21674001]
- Beijing National Laboratory for Molecular Sciences [BNLMS-CXXM-201902]
- Steady High Magnetic Field Facilities, High Magnetic Field Laboratory, CAS
By integrating azulene with a quinoid moiety, a novel non-alternant polycyclic aromatic hydrocarbon molecule BCHF1 exhibiting manifold zwitterionic, quinoidal and diradical behaviors is designed and synthesized. Its zwitterionic feature is evidenced by the changes shown by the H-1-NMR and absorption spectra when the molecule undergoes reversible protonation and deprotonation reactions at varied pH. The diradical facet, manifesting a small singlet-triplet energy gap (Delta ES-T), is characterized with a paramagnetic resonance signal detected by the EPR spectroscopy at room temperature. As the diradical properties are not observed in the protonated form, BCHF1+H+, a pH-controlled reversible magnetic switching behavior is illustrated by monitoring the on and off cycles of EPR signals upon successively adding bases and acids to a solution or exposing a thin film of BCHF1+H+ to base vapor followed by acid vapor.
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