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Synthesis, characterization and L-lactide polymerization behavior of rare-earth metal bis(silylamide) complexes supported by arylamido ligand
被引:5
|作者:
Deng, Meng
[1
]
Chen, Fei
[1
]
Chen, Jue
[1
]
Luo, Yunjie
[1
]
机构:
[1] Zhejiang Univ, Ningbo Inst Technol, Organometall Chem Lab, Ningbo 315100, Zhejiang, Peoples R China
基金:
中国国家自然科学基金;
关键词:
Rare-earth;
Amide complex;
L-lactide;
Polymerization;
RING-OPENING POLYMERIZATION;
BRIDGED BIS(PHENOLATO) LIGAND;
RAC-LACTIDE;
CYCLIC ESTERS;
STRUCTURAL-CHARACTERIZATION;
LIVING POLYMERIZATION;
CRYSTAL-STRUCTURE;
ANCILLARY LIGAND;
BEARING;
CATALYSIS;
D O I:
10.1016/j.jorganchem.2016.02.026
中图分类号:
O61 [无机化学];
学科分类号:
070301 ;
081704 ;
摘要:
Salt metathesis of LnCl(3), [2,6-(Pr2C6H3N)-Pr-i(SiMe3)]Li and LiN(SiHMe2)(2) in 1:1:2 molar ratio in THF produced the mono-arylamido-ligated rare-earth metal bis(silylamide) complexes [2,6-(Pr2C6H3N)-Pr-i(SiMe3)]Ln [N(SiHMe2)(2)](2)(THF) (Ln = Y (1), Lu (2), La (3)) in good isolated yields. All these complexes were characterized by elemental analysis, NMR spectroscopy and FT-IR spectroscopy. 1 was further structurally authenticated by single crystal X-ray diffraction. These complexes alone could serve as highly active initiators for L-lactide polymerization in toluene at 50 degrees C. Employing 1 as the initiator, L-lactide polymerization proceeded in a controllable fashion via the coordination-insertion mechanism verified by end group analysis of the oligomer. (C) 2016 Elsevier B.V. All rights reserved.
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页码:117 / 121
页数:5
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