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Synthesis, structure and catalytic activity comparison of tris‐ and tetracoordinated lanthanide amides
Author(s) -
Xie MeiHua,
Liu XinYuan,
Wang ShaoWu,
Liu Li,
Wu YongYong,
Yang GaoSheng,
Zhou ShuangLiu,
Sheng EnHong,
Huang ZiXiang
Publication year - 2004
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20040220713
Subject(s) - chemistry , lanthanide , tetracoordinate , amide , catalysis , polymerization , anhydrous , medicinal chemistry , polymer chemistry , toluene , sublimation (psychology) , lithium amide , crystal structure , lanthanide contraction , organic chemistry , polymer , ion , psychology , computer graphics (images) , computer science , psychotherapist , planar , enantioselective synthesis
Tetracoordinated lanthanide amides [(Me 3 Si) 2 N] 3 Ln (μ‐CI)Li(THF) 3 (Ln=La (1), Pr (2)) were synthesized by the reaction of anhydrous lanthanide(III) chlorides LnCl 3 (Ln=La, Pr) with 3 equiv. of lithium bis(trimethyl‐silyl)amide (Me 3 Si) 2 NLi in THF, followed by recrystallization from toluene. Sublimation of 1 and 2 afforded the triscoordinate lanthanide amides [(Me 3 Si) 2 N] 3 Ln (Ln=La, Pr). The crystal structure of 2 was determined by X‐ray diffraction analysis. The catalytic activity studies show that the tetracoordinate amides can be used as single‐component MMA (methyl methacrylate) polymerization catalysts, while the triscoordinate amides showed poor activity on h4MA polymerization under the same conditions.