Synthesis, Structure and Catalytic Activity Comparison of Tris-and Tetracoordinated Lanthanide Amide

• 作 者: 谢美华 刘心元 王绍武 刘莉 吴勇勇 杨高升 周双六 盛恩宏 黄子祥
• 机 构: Institute of Organic Chemistry, School of Chemistry and Materials Science, Anhui Normal University,
• 出 处: Chinese Journal of Chemistry
• 发表日期: 2004年07期
• 关键词: polymerization lanthanide complexes monomer olefin Synthesis methacrylate amido

Tetracoordinated lanthanide amides [(Me3Si)2N]3Ln (m-Cl)Li(THF)3 (Ln=La (1), Pr (2)) were synthesized by the reaction of anhydrous lanthanide(III) chlorides LnCl3 (Ln=La, Pr) with 3 equiv. of lithium bis(trimethylsilyl)amide (Me3Si)2NLi in THF, followed by recrystallization from toluene. Sublimation of 1 and 2 afforded the triscoordinate lanthanide amides [(Me3Si)2N]3Ln (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 MMA polymerization under the same conditions.

Tetracoordinated lanthanide amides [(Me3Si) 2N] 3Ln (m-Cl) Li (THF) 3 was synthesized by the reaction of anhydrous lanthanide (III) chlorides LnCl3 , Pr) with 3 equiv. Of lithium bis (trimethylsilyl) amide (Me3Si) 2NLi in THF followed by recrystallization from toluene. Sublimation of 1 and 2 afforded the triscoordinate lanthanide amides [(Me3Si) 2N] 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 MMA polymerization under the same conditions.