Rare-earth Metal Dialkyl Complexes Supported by 1,3-Disubstituted Indolyl Ligand:Synthesis,Characterization and Catalytic Activity for Isoprene Polymerization

• 作者: GUO Li-Ping SONG Ren-Yuan
• 来源期刊: 结构化学
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: coordination chemistry
• 页码范围: 1055-1060
• 页数: 6页
• 语种: 英文
• DOI: 10.14102/j.cnki.0254-5861.2011-3172

摘要

Rare-earth metal dialkyl complexes[1-Bn-3-(DippN=CH)C8H4N]RE(CH2SiMe3)2(thf)2(Dipp =2,6-iPr2C6H3,RE = Y(1)and Er(2))were prepared through the cyclometalation reactions of the N-Bn-3-imino-functionalized indolyl ligand 1-Bn-3-(DippN=CH)C8H5N with one equivalent of rare-earth metal trialkyl precursors.The structures of compounds 1 and 2 were confirmed by X-ray crystal analyses and characterized by elemental analysis,IR,NMR spectroscopy wherein applicable.In the presence of cocatalysts,these rare-earth metal dialkyl complexes initiated isoprene polymerization with a high activity(95％conversion of 2000 equivalent of isoprene in 360 min),producing polymers with high regioselectivity(1,4-polymers up to 91％).