Lanthanocene Diolate Complexes: Synthesis, Structures and Catalytic Property for ε-Caprolactone Polymerization  

作　　者：Zhanghai Gu Li Li Qianwen Bao Fugen Yuan 

机构地区：[1]School of Chemistry and Biochemistry,Suzhou University of Science and Technology,Suzhou,Jiangsu 215009,China

出　　处：《Chinese Journal of Chemistry》2015年第5期563-567,共5页中国化学（英文版）

摘　　要：Reaction of LnCl3 first with three equivalent of C5H5Na in THF,then with one equivalent of N-phenyldiethanolamine in THF-DME afforded complexes of{[(C_(5)H_(5))Ln(μ-OCH_(2)CH_(2))_(2)N(C_(6)H_(5))]4(μ_(4)-C_(l))}[Na(DME)_(4)](Ln=Sm(1),Yb(2)),being characterized by infrared spectra,elemental analyses and X-ray crystallography.They are ionic pair compounds.The anionic part is a cluster,which can be viewed as a cyclic tetramer with four(C5H5)Ln units bridged by four pairs of OR groups,forming a pinwheel structure.Both the complexes can catalyze the ring-opening polymerization ofε-caprolactone under mild conditions,and complex 1 is more active than complex 2.The polymerization accords with one order reaction kinetics for monomer concentration.The molecular weight increases with the yield increasing,and the molecular weight distribution is rather narrow(1.19<PDI<1.29).

关 键 词：LANTHANIDE ALKOXIDE catalytic activity CAPROLACTONE 

分 类 号：O62[理学—有机化学]