个人信息Personal Information
教授
博士生导师
硕士生导师
性别:男
毕业院校:日本东京大学
学位:博士
所在单位:化工学院
电子邮箱:qujp@dlut.edu.cn
Alkyl Effects on the Chain Initiation Efficiency of Olefin Polymerization by Cationic Half-Sandwich Scandium Catalysts: A DFT Study
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论文类型:期刊论文
发表时间:2016-03-28
发表刊物:ORGANOMETALLICS
收录刊物:SCIE、EI
卷号:35
期号:6
页面范围:913-920
ISSN号:0276-7333
摘要:The effect of alkyls on the chain initiation efficiency of :ethylene, propene, 1-hexene, styrene, butadiene, and isoprene polymerizations catalyzed by the half-sandwich cationic rare-earth-metal alkyl complexes [(eta(5)-C5Me5)ScR](+) (R = CH2SiMe3, 1; R = o-CH2C6H4NMe2, 2; R = eta(3)-C3H5, 3) has been studied by using a DFT approach. It has been found that 2 with the largest sterically demanding aminobenzyl group results in the lowest initiation efficiency and thus longest induction period among the three catalysts investigated. In contrast, 1 with CH2SiMe3 displays the best chain initiation ability, and 3 with eta(3)-allyl gives moderate chain initiation activity, mainly due to the most stable resulting coordination complex. Species 1 and 3 have better regioselectivity in the chain initiation of styrene polymerization than species 2. In addition, species 1' ([eta(5)-C5Me5)Sc(CH2SiMe3)THF](+)) with a THF ligand has better chain initiation efficiency in styrene and isoprene polymerizations than species 2 but is reasonably worse than the analogue 1 without a THF ligand.