应用化学 ›› 2022, Vol. 39 ›› Issue (5): 843-851.DOI: 10.19894/j.issn.1000-0518.210482

• 研究论文 • 上一篇    下一篇

苯胺基桥联双芳氧基稀土金属配合物的合成、表征及催化性能

陈洪霞1,2,3, 李宝霞1, 姚英明1(), 刘朋4   

  1. 1.苏州大学材料与化学化工学部,苏州 215123
    2.江苏凯伦建材股份有限公司,苏州 215234
    3.苏州大学实验室与设备管理处,苏州 215021
    4.苏州大学分析测试中心,苏州 215123
  • 收稿日期:2021-09-28 接受日期:2022-01-04 出版日期:2022-05-01 发布日期:2022-05-24
  • 通讯作者: 姚英明
  • 作者简介:第一联系人:共同第一作者
  • 基金资助:
    国家自然科学基金(21674070)

Synthesis, Characterization and Catalytic Activity of Benzylamine⁃bridged Bis(phenolato)lanthanide Complexes

Hong-Xia CHEN1,2,3, Bao-Xia LI1, Ying-Ming YAO1(), Peng LIU4   

  1. 1.College of Chemistry,Chemical Engineering and Materials Science,Soochow University,Suzhou 215123,China
    2.Jiangsu Canlon Building Materials Co. ,Ltd,Suzhou 215234,China
    3.Department of Laboratory and Equipment Management,Soochow University,Suzhou 215021,China
    4.Testing and Analysis Center,Soochow University,Suzhou 215123,China
  • Received:2021-09-28 Accepted:2022-01-04 Published:2022-05-01 Online:2022-05-24
  • Contact: Ying-Ming YAO
  • About author:yaoym@suda.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21674070)

摘要:

通过配体前体苯胺基桥联双酚(PhN{CH2-(2-HO-C6H2-Bu2t-3,5)}2,L1H2)与三硅胺基稀土金属配合物的质子交换反应,合成了苯胺基桥联双芳氧基稀土金属配合物,发现反应介质对反应的产物有明显的影响。L1H2与Ln[N(TMS)23μ-Cl)Li(THF)3以物质的量比1∶1在甲苯中90 ℃下反应,可以得到预期的苯胺基桥联双芳氧基稀土金属胺化物L1LnN(TMS)2(THF) (Ln=Yb(1),Sm(2))。而L1H2与Sm[N(TMS)23μ-Cl)Li(THF)3以1∶1的物质的量比在四氢呋喃(THF)中50 ℃下反应,则得到钐-锂杂双金属配合物(THF)LiL12Sm (3)。这些配合物均经过了红外光谱、元素分析和单晶结构测定的表征。发现配合物12可以有效地催化L-丙交酯和DL-丙交酯的开环聚合,得到高相对分子质量的聚丙交酯。其中,配合物1DL-丙交酯的开环聚合显示很好的选择性,可以得到杂同含量(Pr)达到0.87的聚丙交酯。

关键词: 苯胺基桥联芳氧基, 稀土金属, 丙交酯, 聚合

Abstract:

Lanthanide metal complexes stabilized by benzylamine-bridged bis(phenolato) ligand, (PhN{CH2-(2-O-C6H2-Bu2t-3,5)}2) (L1), were synthesized by the reaction of the ligand precursor L1H2 with lanthanide amide. The reaction media has profound influence on the reaction. The reaction of Ln[N(SiMe323μ-Cl)Li(THF)3 with L1H2 in a 1∶1 molar ratio is performed in toluene at 90 ℃ to give the desired benzylamine-bridged bis(phenolate) lanthanide amido complexes L1LnN(SiMe32(THF) (Ln = Yb (1), Sm (2)), while the same reaction of Sm[N(SiMe323μ-Cl)Li(THF)3 with L1H2 in a 1∶1 molar ratio in THF at 50 ℃ only gives the unexpected Sm-Li heterobimetallic complex (THF)LiL12Sm (3). All of these complexes were characterized by IR, elemental analysis and single crystal X-ray diffraction. The catalytic activities of complexes 1 and 2 for the ring-opening polymerization of L-lactide and DL-lactide were tested. It is found that these complexes are efficient initiators for lactide polymerization to give polylactide with high relative molecular mass. Complex 1 has good stereoselectivity for DL-lactide polymerization to give syndio-rich polylactide (Pr=0.87).

Key words: Benzylamine-bridged bis(phenolato) ligand, Lanthanide complex, Lactide, Polymerization

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