The author of 《Orthogonal Oriented Bisanthrancene-Bridged Bis(Triarylamine) Diradical Dications: Isolation, Characterizations and Crystal Structures》 were Wang, Lei; Zhang, Li; Fang, Yong; Zhao, Yue; Tan, Gengwen; Wang, Xinping. And the article was published in Chemistry – An Asian Journal in 2019. Safety of Bis(4-methoxyphenyl)amine The author mentioned the following in the article:
Two bis(triarylamine) diradical dication salts 12+2[Al(ORF)4]- and 22+2[Al(ORF)4]- bridged with an orthogonal oriented bisanthrancene motif were synthesized. Their solid state and electronic structures were studied by various exptl. approaches in conjunction with theor. calculations Superconducting quantum interference device measurements and d. functional theory calculations reveal that both of 12+ and 22+ feature open-shell singlet ground states with rather small singlet-triplet energy gaps; thus, they can be regarded as nearly pure diradicals (biradicals). Their diradical characters are enhanced by the orthogonal configuration of the bisanthrancene moiety which demonstrates the importance of the geometry of bridging units in turning the electronic structures of bis(triarylamine) dications. In the experimental materials used by the author, we found Bis(4-methoxyphenyl)amine(cas: 101-70-2Safety of Bis(4-methoxyphenyl)amine)
Bis(4-methoxyphenyl)amine(cas: 101-70-2) is a diphenylamine derivative used as a chemical additive for cured rubber.Bis(4-methoxyphenyl)amine is highly toxic and may potentially induce chromosome abberation.Safety of Bis(4-methoxyphenyl)amine
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem