Synthesis and Characterization of Heteroscorpionate Rare-Earth Metal Dialkyl Complexes and Catalysis on MMA Polymerization
writer：Zhang, ZC；Cui, DM；Trifonov, AA
keywords：Rare earths, Tridentate ligands,Polymerization
source：期刊
specific source：http://onlinelibrary.wiley.com/doi/10.1002/ejic.201000108/abstract?systemMessage=Wiley+Online+Librar
Issue time：2010年
A
series of rare-earth metal alkyl complexes supported by a heteroscorpionate
ligand were prepared and structurally characterized. X-ray diffraction analysis
revealed that the heteroscorpionate ligand is face-capping on the rare-earth
metal in k(3) mode, making the configuration of the afforded chalky! metal
complexes similar to that of half-metallocenes. These complexes are capable of
polymerizing methyl methacrylate, with the lutetium complex displaying the
highest activity even at low temperature. The poly(methyl methacrylate)
obtained is syndiotactically enriched with narrow molecular weight
distribution.
