由桥联茚基辅助配体[C 9 H 6 SiMe 2-(CH 2)2 SiMe 2 C 9 H 6 ] Ln(µ-Cl)2 Li(TMEDA)支撑的两种新型稀土金属氯化物络合物Y(1),Lu(2)],是通过盐复分解反应合成的。C 9 H 7 SiMe 2(CH 2)2 SiMe 2 C 9 H 7与2当量的反应 在室温下,将正丁基锂在己烷中的洗脱液[C9 H 6 SiMe 2-(CH 2)2 SiMe 2 C 9 H 6 ] Li 2为白色粉末,分离产率为95%。在室温下用无水LnCl 3以1:1摩尔比在THF / TMEDA中进一步处理[C 9 H 6 SiMe 2(CH 2)2 SiMe 2 -C 9 H 6 ] Li 2氯化物1和2单产达86%–89%。两种复合物均通过FT-IR光谱,NMR光谱,元素分析和X射线单晶结构分析进行了表征。在这两种络合物的中心金属是八配位由两个茚基配体在η 5
Rare earth metal benzyl complexes bearing bridged-indenyl ligand for highly active polymerization of methyl methacrylate
摘要:
The novel anionic bridged-indenyl rare earth metal benzyl complexes [{C9H6SiMe2(CH2)(2)SiMe2C9H6} Ln(CH2C6H4-p-tBu)(2)][Li(THF)(4)] (Ln = Y (1), Lu (2)) were synthesized by an acid-base reaction of C9H7SiMe2(CH2)(2)SiMe2C9H7 with one equiv. of rare earth metal trisbenzyl complexes, which were formed in situ from the reaction of anhydrous LnCl(3) with LiCH2C6H4-p-tBu in 1:3 molar ratio in THF. The complexes were characterized by elemental analysis, NMR spectroscopy, FT-IR spectroscopy, and X-ray structural analysis in the case of 2. Both complexes are active for the polymerization of methyl methacrylate (MMA) to afford high molecular weight and narrow molecular weight distribution PMMA. The molecular weights of PMMA could be controlled using 1 as a polymerization initiator in chlorobenzene at -40 degrees C. (C) 2009 Elsevier B. V. All rights reserved.
Rare earth metal benzyl complexes bearing bridged-indenyl ligand for highly active polymerization of methyl methacrylate
作者:Dan Lin、Jue Chen、Chengcai Luo、Yong Zhang、Yingming Yao、Yunjie Luo
DOI:10.1016/j.jorganchem.2009.04.033
日期:2009.8
The novel anionic bridged-indenyl rare earth metal benzyl complexes [C9H6SiMe2(CH2)(2)SiMe2C9H6} Ln(CH2C6H4-p-tBu)(2)][Li(THF)(4)] (Ln = Y (1), Lu (2)) were synthesized by an acid-base reaction of C9H7SiMe2(CH2)(2)SiMe2C9H7 with one equiv. of rare earth metal trisbenzyl complexes, which were formed in situ from the reaction of anhydrous LnCl(3) with LiCH2C6H4-p-tBu in 1:3 molar ratio in THF. The complexes were characterized by elemental analysis, NMR spectroscopy, FT-IR spectroscopy, and X-ray structural analysis in the case of 2. Both complexes are active for the polymerization of methyl methacrylate (MMA) to afford high molecular weight and narrow molecular weight distribution PMMA. The molecular weights of PMMA could be controlled using 1 as a polymerization initiator in chlorobenzene at -40 degrees C. (C) 2009 Elsevier B. V. All rights reserved.
Synthesis and Crystal Structure of Rare Earth Metal Chlorides Bearing Bridged-Indenyl Ancillary Ligand
anhydrous LnCl3 in 1:1 molar ratio in THF/TMEDA at room temperature provided the bridged‐indenyl rareearthmetal chlorides 1 and 2 in 86%–89% isolated yields. Both complexes were characterized by FT‐IR spectroscopy, NMR spectroscopy, elemental analysis, and X‐ray single crystalstructure analysis. The central metals in both complexes are eight‐coordinated by two indenyl ligands in η5‐fashion, and two chlorine
由桥联茚基辅助配体[C 9 H 6 SiMe 2-(CH 2)2 SiMe 2 C 9 H 6 ] Ln(µ-Cl)2 Li(TMEDA)支撑的两种新型稀土金属氯化物络合物Y(1),Lu(2)],是通过盐复分解反应合成的。C 9 H 7 SiMe 2(CH 2)2 SiMe 2 C 9 H 7与2当量的反应 在室温下,将正丁基锂在己烷中的洗脱液[C9 H 6 SiMe 2-(CH 2)2 SiMe 2 C 9 H 6 ] Li 2为白色粉末,分离产率为95%。在室温下用无水LnCl 3以1:1摩尔比在THF / TMEDA中进一步处理[C 9 H 6 SiMe 2(CH 2)2 SiMe 2 -C 9 H 6 ] Li 2氯化物1和2单产达86%–89%。两种复合物均通过FT-IR光谱,NMR光谱,元素分析和X射线单晶结构分析进行了表征。在这两种络合物的中心金属是八配位由两个茚基配体在η 5