Bis(imino)diphenylamido rare-earth metal dialkyl complexes: synthesis, structure, and catalytic activity in living ring-opening ε-caprolactone polymerization and copolymerization with γ-butyrolactone
作者:Gaixia Du、Yanling Wei、Wei Zhang、Yuping Dong、Zhengguo Lin、Huan He、Shaowen Zhang、Xiaofang Li
DOI:10.1039/c2dt31932b
日期:——
rare-earth metal dialkyl complexes [o-(2,6-iPr2-C6H3–NC–C6H4)2–N]Ln(CH2SiMe3)2 (1: Ln = Sc; 2: Ln = Lu; 3: Ln = Y) have been synthesized in good yields and structurally characterized by elemental analysis, NMR spectroscopy, and single-crystal X-ray diffraction studies. They serve as highly efficient single-component catalysts both for the living ring-opening ε-caprolactone polymerization and random copolymerization
双(亚氨基)二苯基酰胺基稀土金属二烷基络合物[ o-(2,6- i Pr 2 -C 6 H 3 –N C–C 6 H 4)2 -N] Ln(CH 2 SiMe 3)2(1:Ln = Sc;2:Ln = Lu;3:Ln = Y)已经以高收率合成,并且通过元素分析,NMR光谱和单晶X射线衍射研究对其结构进行了表征。它们既可以作为活泼的开环ε-己内酯聚合反应,也可以作为无规共聚的高效单组分催化剂。γ-丁内酯,其活性取决于金属中心周围的空间位阻,产生具有窄分子量分布的高分子量PCL或P(CL- co -BL)。