%0 Journal Article
%T Synthesis and characterization of N-aryloxo-functionalized ¦Â-ketoiminate rare-earth complexes and their catalytic activity for the polymerization of  -caprolactone
%A XiangZong Han
%A LiangLiang Wu
%A YingMing Yao
%A Yong Zhang
%A Qi Shen
%J Chinese Science Bulletin
%@ 1861-9541
%D 2009
%I 
%R 10.1007/s11434-009-0514-7
%X The synthesis and characterization of dimeric rare-earth amides stabilized by a dianionic N-aryloxo functionalized ¦Â-ketoiminate ligand are described. Reactions of 4-(2-hydroxy-5-methyl-phenyl) imino-2-pentanone (LH2) with Ln[N(SiMe3)2]3(¦Ì-Cl)Li(THF)3 in a 1:1 molar ratio in THF gave the dimeric rare-earth amido complexes [LLn{N(SiMe3)2}(THF)]2 [Ln = Nd (1), Sm (2), Yb (3), Y (4)]. These complexes were well characterized, and the definitive molecular structures of complexes 3 and 4 were determined. It was found that complexes 1¨C4 can initiate the ring-opening polymerization of  -caprolactone, and the ionic radii of the central metals have significant effect on the catalytic activity.
%K rare earth
%K ¦Â-ketoiminate ligand
%K amide
%K synthesis
%K polymerization
%K -caprolactone
%U http://link.springer.com/article/10.1007/s11434-009-0514-7