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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