Scalar Coupling Across [CH⋅⋅⋅FC] Interactions in (σ-Aryl)-Chelating Post-Metallocenes
作者:Loi-Chi So、Cham-Chuen Liu、Michael C. W. Chan、Jerry C. Y. Lo、Kong-Hung Sze、Nianyong Zhu
DOI:10.1002/chem.201102439
日期:2012.1.9
intramolecular C‐H⋅⋅⋅F‐C and Hf⋅⋅⋅F‐C contacts. All complexes have been characterized by multinuclear NMR spectroscopy. The 1H and 13C NMR spectra of [M(O,C,NCF3)(CH2Ph)2] derivatives display coupling (assigned to 1hJHF and 2hJCF for Ti; 3JHF and 2JCF (through M⋅⋅⋅F) for Hf and Zr) between the benzyl CH2 and CF3 moieties. [1H,19F]‐HMBC NMR experiments have been performed for the M‐[O,C,N‐R1] complexes
C的性质和重要性 H⋅⋅⋅F ç相互作用是局部又有争议的问题,和光谱方法的发展,探讨这种接触,因此是必要的。一系列群组4双(苄基)配合物的(σ -芳基)-2-酚-6-吡啶基支持[O,C,N - [R 1 ]配体轴承的氟化- [R 1基团(CF 3或F)在金属附近已经准备好了。CF 3取代的Hf衍生物的X射线晶体结构具有分子内C-H⋅⋅⋅F-C和Hf⋅⋅⋅FC接触。所有配合物均已通过多核NMR光谱进行了表征。的1 H和13 [M(O,C,N的C NMR谱 CF 3)(CH 2 PH)2 ]衍生物显示联接(转让给1H Ĵ HF和2H Ĵ CF为钛; 3 Ĵ HF和2 Ĵ CF(通过M⋅⋅⋅F)为苄基之间Hf和Zr)的CH 2和CF 3部分。[ 1个H,19 F] -HMBC NMR实验已经为M-进行[O,C,N-R 1 ]络合物及其[O,N,C]对应,工作在C揭示显著标量偶合 H⋅