should be easily amenable upon solvent evaporation (ΔG‡ = 14 kcal mol−1 in the case of 2c). Two structures with one acetonitrile ligand could be optimized in both cases: (i) a truly T-shaped 14-electron structure with an end-on acetonitrile ligand, and (ii) a masked T-shaped structure stabilized by the π-coordination of the dangling CN group of the metallated alkyl chain, the latter being favoured by 2
四种阳离子C,C-(NHC-
氰基烷基)-
镍(II)
金属环配合物[[Ni Me-NHC-CH 2 CH(CN)}(NCMe)](PF 6)(2a),[Ni Mes- NHC-CH 2 CH(CN)}(NCMe)](PF 6)(2b),[Ni Mes-NHC-(CH 2)2 CH(CN)}(NCMe)](PF 6)(2c)和[Ni DiPP-NHC-(CH 2)2 CH(CN)}(NCMe)](PF 6)(2d)是通过在酸性条件下于0°C从相应的夹层
镍杂环化合物[NiCP R-NHC-(CH 2)Ñ CH(CN)}](1A-1D ; CP =η 5 -C 5 H ^ 5 ; ñ = 1或2; R-NHC-(CH 2)Ñ CH(CN)= 1-R-3- [ (CH 2)n CH(CN)]-
咪唑-2-亚烷基)。通过CD 3 CN和
吡啶-d 5中的1 H和13 C 1 H} NMR光谱对