Half-Sandwich Rare-Earth metal complexes bearing 4,5,6,7-Tetrahydroindenyl ligands for highly Syndiospecific (Co)Polymerization of styrene
作者:Xiang Hu、Yanchen Huo、Xuyang Yan、Fei Wang、Li Pan、Xiaochao Shi
DOI:10.1016/j.inoche.2023.110784
日期:2023.7
were also sucessfully prepared and tested for styrene (co)polymerization. In conjunction with [Ph3C][B(C6F5)4], the THI-ligated scandium complexes exhibited high catalytic activity for highly syndiotactic polymerization of styrene (>99% rrrr). THI3Me-Sc/[Ph3C][B(C6F5)4] binary system also promoted the copolymerization of styrene and isoprene/butadiene by both the concurrent addition and sequentical
作为 Cp 衍生配体,合成了具有可调空间体积的取代 4,5,6,7-四氢茚 (THI) 配体,并成功制备了它们连接的半夹心稀土金属配合物并测试了苯乙烯 (co)聚合。结合 [Ph 3 C][B(C 6 F 5 ) 4 ],THI 连接的钪配合物对苯乙烯的高度间规聚合表现出高催化活性 (>99% rrrr )。THI 3Me -Sc /[Ph 3 C][B(C 6 F 5 ) 4] 二元体系还通过同时添加和顺序添加单体来促进苯乙烯和异戊二烯/丁二烯的共聚,提供具有嵌段微观结构的共聚物,如 NMR( 1 H 和 13 C)光谱所确定的。在动力学研究中揭示的苯乙烯和异戊二烯/丁二烯之间反应率的巨大差异(r IP / r St = 31.1 和r BD / r St = 173.6)进一步证明了所得共聚物的主要嵌段结构。