reaction of [(TMS)2N]3La(mu-Cl)Li(THF)3 (1) and HSPh produced a bimetallic complex [(TMS)2N}2La(THF)]2(mu-SPh)(mu-Cl)] (2). Compound [(TMS)2N}2La5O(SPh)10LiCl2(THF)6] (3) was prepared by control of the hydrolysis of 2 and LiCl or 1 and HSPh with the proper amount of water. 1 was treated first with 1/6 equiv of H2O and then with equimolar HSPh; a polymeric complex [(TMS)2N}2(mu-SPh)La(mu-SPh)Li(THF)2](infinity)
Synthesis of Rare-Earth Metal Amides Bearing an Imidazolidine-Bridged Bis(phenolato) Ligand and Their Application in the Polymerization of <scp>l</scp>-Lactide
作者:Zhongjian Zhang、Xiaoping Xu、Wenyi Li、Yingming Yao、Yong Zhang、Qi Shen、Yunjie Luo
DOI:10.1021/ic802177y
日期:2009.7.6
yields. All of these complexes are fully characterized. X-ray structural determination revealed that complexes 1−6 are isostructural and have a solvated monomeric structure. The coordination geometry around each of the rare-earth metal atoms can be best described as a distorted trigonal bipyramid. It was found that complexes 1−6 are efficient initiators for the ring-openingpolymerization of l-lactide, and