AbstractBis(carbazolide) complexes M[3,6‐tBu2‐1,8‐(RC≡C)2Carb]2(THF)n (R=SiMe3, n=0, M=Ca, Yb; R=Ph, n=1, M=Ca, Yb; n=0, M=Yb) were synthesized through transamination reaction of M[N(SiMe3)2]2(THF)2 with two molar equivalents of carbazoles. The complexes feature M(η2‐C≡C)4 structural motif composed of M(II) ions encapsulated by four acetylene fragments due to atypical for alkaline‐ and rare‐earth metals η2‐interactions with triple C≡C bond. This interaction is evidenced experimentally by X‐ray diffraction, Raman spectroscopy in the solid state and by NMR‐spectroscopy in the solution. According to QTAIM analysis there are 4 bond critical points (3;−1) between the metal atom and each of the triple bonds, which are connected by a strongly curved, almost T‐shaped bond pathway.
摘要通过M[N(SiMe3)2]2(THF)2与两个摩尔当量的
咔唑发生反式反应,合成了双(
咔唑)络合物M[3,6-tBu2-1,8-(RC≡C)2Carb]2(THF)n(R=SiMe3,n=0,M=Ca,Yb;R=Ph,n=1,M=Ca,Yb;n=0,M=Yb)。这些配合物具有 M(η2-C≡C)4结构基团,由四个
乙炔片段包裹的 M(II)离子组成,这是因为碱
金属和稀土
金属与三重 C≡C 键的非典型 η2 相互作用。这种相互作用通过 X 射线衍射、固态拉曼光谱和溶液中的核磁共振光谱得到了实验证明。根据 QTAIM 分析,在
金属原子和每个三键之间有 4 个键临界点(3;-1),这些临界点通过一个强烈弯曲、几乎呈 T 形的键路径连接起来。