Since the pioneering work by Thiele and Chichibabin, who synthesized the first diradicals bridged by phenylene and biphenylene groups in 1904 and 1907, respectively, numerous efforts have been devoted to synthesizing stable diradicals during the last few decades, and several strategies have been developed to stabilize these highly reactive diradicals. In this Account, we describe the synthesis and characterization of isolable bis(triarylamine) dications, nitrogen analogues of Thiele’s, Chichibabin’s, and Müller’s hydrocarbons, which represent facilely accessible, stable diradicals by replacing carbinyl centers with isoelectronic aminium centers. Along with discussing the molecular structures and electronic structures of the isolated bis(triarylamine) dications, their spectroscopic and magnetic properties are also introduced.

中文翻译：

---

可分离的双（三芳基胺）阳离子：Thiele，Chichibabin和Müller烃的类似物

自从Thiele和Chichibabin分别在1904年和1907年合成了第一个由亚苯基和亚联苯基桥连的双自由基基团以来的开创性工作以来，过去数十年来，人们一直致力于合成稳定的双自由基基团，并开发了多种策略来稳定这些高反应性自由基。在本报告中，我们描述了可分离的双（三芳基胺）药物，Thiele's，Chichibabin's和Müller's碳氢化合物的氮类似物的合成和表征，这些碳氢化合物通过用等电电子中心取代羰基中心代表了易于获得的稳定的双自由基。除了讨论分离的双（三芳基胺）指示剂的分子结构和电子结构外，还介绍了它们的光谱和磁性。