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Synthesis, structure characterization and catalytic activity of lanthanide complexes containing an ansa carbonous‐bridged cyclopentadienyl—thienyl ligand
Author(s) -
Xie Xiaomin,
Huang Jiling
Publication year - 2009
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.1449
Subject(s) - chemistry , cyclopentadienyl complex , catalysis , ligand (biochemistry) , lanthanide , yield (engineering) , polymerization , medicinal chemistry , stereochemistry , solvent , polymer chemistry , organic chemistry , ion , biochemistry , materials science , receptor , polymer , metallurgy
A kind of new lanthanocene complex with an ansa carbonous‐bridged cyclopentadienyl/aromatic heterocycle ligand was prepared and characterized. Based on the data of elemental analyses, MS and IR, they were presumed to be solvent‐free complexes (cyclo‐C 4 H 3 SCMe 2 C 5 H 4 ) 2 LnCl [Ln = Er (1), Dd ( 2 ), Y ( 3 ), Sm ( 4 )]. These complexes were effective for the polymerization of methyl methacrylate in the presence of co‐catalyst. When AlEt 3 and NaH (nanometric) were used as different co‐catalysts, the lanthanocene complexes 1–4 showed different catalytic behavior. These differences resulted from the formation of different active species. The catalyst system (cyclo‐C 4 H 3 SCMe 2 C 5 H 4 ) 2 LnCl/NaH (nanometric) showed high catalytic activity (yield ≥ 95% and M η > 10 5 ) in a short time at the ambient temperature. Copyright © 2008 John Wiley & Sons, Ltd.