吡咯茂钐络合物的合成及其催化的丙交酯聚合  

Synthesis and catalytic lactide polymerization of pyrrolyl-cyclopentadienyl samarium complexes

作　　者：郝静君[1] 宋海斌[1] 崔春明[1] 

机构地区：[1]南开大学元素有机化学研究所,元素有机化学国家重点实验室,天津300071

出　　处：《中国科学（B辑）》2009年第9期959-964,共6页Science in China(Series B)

基　　金：国家自然科学基金(批准号:20572050);天津市自然科学基金(批准号:05YFJMJC00500)资助

摘　　要：本文合成了吡咯修饰的二茂稀土金属有机化合物,并研究了该化合物对丙交酯的聚合,结果显示该化合物可以在很宽的温度范围内实现对丙交酯的高转化率聚合.Reaction of dimethylsilylene-bridged pyrrolyl cyclopentadienyl potassium salt （H4Cs-SiMe2-NC4H4）K （Cp＇K, 2） with SmI2（THF）2 yielded the THF solvated divalent samarium complex （Cp＇）2Sm（THF）2 （3）. The coordinated THF molecules can be easily removed to give THF free, polymeric （Cp＇2Sm）n （4）. The crystal structure of 3 has been determined by X-ray single-crystal analysis, in which both the pendent pyrrolyl rings reside toward the sa- marium center, indicating the pendent pyrrolyl rings have pronounced effects on the structure of 3. Complexes 3 and 4 have been investigated as catalysts for ring opening polymerization of rac-lactide. Both complexes are active for the polymerization of lactide and the resulting polylactides have high molecular weight and narrow molecular distributions. The polymeric species 4 is more active than 3 in hydrocarbon solvents.

关 键 词：二茂钐 丙交酯聚合 转化率 

分 类 号：O631.3[理学—高分子化学]