@article {28584,
	title = {A polycyclic aromatic hydrocarbon diradical with\&nbsp;p H-responsive magnetic properties},
	journal = {Chem. Sci.},
	volume = {11},
	number = {21},
	year = {2020},
	note = {[[{"fid":"9259","view_mode":"default","type":"media","attributes":{"height":"667","width":"1000","class":"media-element file-default"}}]]},
	pages = {5565-5571},
	publisher = {The Royal Society of Chemistry},
	type = {10.1039/D0SC00770F},
	abstract = {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 1H-NMR and absorption spectra when the molecule undergoes reversible protonation and deprotonation reactions at varied pH. The diradical facet, manifesting a small singlet{\textendash}triplet energy gap (ΔES{\textendash}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.},
	isbn = {2041-6520},
	url = {http://dx.doi.org/10.1039/D0SC00770F},
	author = {Fu, Xiangyu<sup>{\textdagger}</sup> and Han, Han<sup>{\textdagger}</sup> and Zhang, Di and Yu, Han and He, Qilin and <strong>Zhao, Dahui*</strong>}
}
