Highly active half-sandwich chromium(III) catalysts bearing bis(imino)pyrrole ligands for ethylene (co) polymerization

doi:10.1039/c4ra02039a

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	Highly active half-sandwich chromium(III) catalysts bearing bis(imino)pyrrole ligands for ethylene (co) polymerization
	Liu, Jing-Yu; Tao, Ping; Wang, Yong-Xia; Li, Yue-Sheng
刊名	RSC ADVANCES
	2014
卷号	4 期号:37 页码:19433-19439
ISSN号	2046-2069
DOI	10.1039/c4ra02039a
英文摘要	A series of half-sandwich Cr(III) complexes bearing bis(imino) pyrrole ligands,Cp '[2,5-C4H2N(CH=NAr)(2)] CrCl [Cp ' = C5H5, Ar = C6H5 (2a), 2,6-Me2C6H3 (2b), 2,6-(Pr2C6H3)-Pr-i (2c), C6F5 (2d); Cp ' = C5Me5, Ar C6H5 (3a), 2,6-(Pr2C6H3)-Pr-i (3c)] were synthesized with good yields. The complexes were characterized by FTIR and mass spectrometry in addition to elemental analyses. X-ray structural analyses for 2a-c showed that the Cr complexes have a pseudo-octahedral coordination environment with a three-legged "piano stool" geometry. One of the imino nitrogen atoms is coordinated with the Cr metal. On activation with methylaluminoxane, the Cp-based complexes showed high catalytic activities for ethylene polymerization. High molecular weight polymers with unimodal molecular weight distributions were obtained, indicating that the nature of the polymerization was single site. The copolymerization of ethylene with norbornene by the pre-catalysts 2a-d was also explored in the presence of methylaluminoxane. The catalytic activity, co-monomer incorporation and the properties of the resultant polymers can be controlled over a wide range by tuning the catalyst structures and reaction parameters.
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000335559100053
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/51837]
专题	中国科学院化学研究所
通讯作者	Li, Yue-Sheng
作者单位	Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
推荐引用方式 GB/T 7714	Liu, Jing-Yu,Tao, Ping,Wang, Yong-Xia,et al. Highly active half-sandwich chromium(III) catalysts bearing bis(imino)pyrrole ligands for ethylene (co) polymerization[J]. RSC ADVANCES,2014,4(37):19433-19439.
APA	Liu, Jing-Yu,Tao, Ping,Wang, Yong-Xia,&Li, Yue-Sheng.(2014).Highly active half-sandwich chromium(III) catalysts bearing bis(imino)pyrrole ligands for ethylene (co) polymerization.RSC ADVANCES,4(37),19433-19439.
MLA	Liu, Jing-Yu,et al."Highly active half-sandwich chromium(III) catalysts bearing bis(imino)pyrrole ligands for ethylene (co) polymerization".RSC ADVANCES 4.37(2014):19433-19439.