The fluorinated diarylamines HNPhPhF, HNPhF2, HNPhArF, PhF = 2,3,4,5,6-pentafluorophenyl, ArF = 3,5-bis(trifluoromethyl)phenyl, are used to prepare complexes of uranium(III, IV) ions. Despite being electron-poor amines with little steric bulk, their coordinated amide ligands exhibit direct control over the coordination environment through a subtle, cooperative interplay of multiple labile F→U dative interactions and favorable arene–arene interactions. The C–F→U interactions, ∼8.9 kcal mol−1 as determined by variable temperature NMR experiments, persist in solution and allow the isolation of otherwise unstable species as well as the first pseudo-square planar uranium complex.
氟化二芳基胺 HNPhPhF、HNPhF2、HNPhArF(PhF = 2,3,4,5,6-
五氟苯基,ArF = 3,5-双(三
氟甲基)苯基)用于制备
铀(III、IV)离子的配合物。尽管它们是几乎没有立体体积的贫电子胺,但它们的配位酰胺
配体通过多种易变的 F→U 作用和有利的炔-烯相互作用的微妙、合作的相互作用,表现出对配位环境的直接控制。根据变温核磁共振实验的测定,C-F→U 相互作用 ∼8.9 kcal mol-1,这种作用在溶液中持续存在,因此可以分离出原本不稳定的物种以及第一个假方形平面
铀配合物。