Synthesis and characterization of aminophenolate-ligated rare-earth metal amide complexes and their catalytic activity for lactides polymerization
来源期刊:JOURNAL OF RARE EARTHS2020年第8期
论文作者:Min Li Wenyi Li Yingming Yao Yunjie Luo
文章页码:921 - 926
摘 要:Amine elimination of Ln[N(SiMe3)2]3(μ-Cl)Li(THF)3 with aminophenol H[ON] {H[ON]=2-(CH2 NC5 H10)-4,6-tBu2-C6 H3OH} in 1:2 molar ratio in THF gave the monometallic rare-earth metal amide complexes[ON]2 LnN(SiMe3)2(Ln=Yb(1),Y(2),Gd(3),Sm(4),Nd(5)) in 57%-73% isolated yields.All these complexes were characterized by elemental analysis.The molecular structures of complexes 1-4 were determined by single crystal X-ray diffraction.These complexes are highly active for L-Iactide polymerization to give high molecular weight polymers with unimodal molecular weight distributions.In addition,these complexes can also initiate rac-lactide polymerization with high activity to afford heterotactic-rich polylactides.
Min Li1,Wenyi Li2,Yingming Yao2,3,Yunjie Luo1
1. School of Material Science and Chemical Engineering,Ningbo University2. College of Chemistry,Chemical Engineering & Materials Science,Soochow University3. State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences
摘 要:Amine elimination of Ln[N(SiMe3)2]3(μ-Cl)Li(THF)3 with aminophenol H[ON] {H[ON]=2-(CH2 NC5 H10)-4,6-tBu2-C6 H3OH} in 1:2 molar ratio in THF gave the monometallic rare-earth metal amide complexes[ON]2 LnN(SiMe3)2(Ln=Yb(1),Y(2),Gd(3),Sm(4),Nd(5)) in 57%-73% isolated yields.All these complexes were characterized by elemental analysis.The molecular structures of complexes 1-4 were determined by single crystal X-ray diffraction.These complexes are highly active for L-Iactide polymerization to give high molecular weight polymers with unimodal molecular weight distributions.In addition,these complexes can also initiate rac-lactide polymerization with high activity to afford heterotactic-rich polylactides.
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