Synthesis and Characterization of Titanium(IV) Complexes Bearing Monoanionic [O-NX] (X = O, S, Se) Tridentate Ligands and Their Behaviors in Ethylene Homo- and Copolymerizaton with 1-Hexene

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• 作者：Cong Wang ; Zhi Ma ; Xiu-Li Sun ; Yuan Gao ; Yang-Hui Guo ; Yong Tang ; and Li-Ping Shi
• 刊名：Organometallics
• 出版年：2006
• 出版时间：June 19, 2006
• 年：2006
• 卷：25
• 期：13
• 页码：3259 - 3266
• 全文大小：167K
• 年卷期：v.25,no.13(June 19, 2006)
• ISSN：1520-6041

文摘

A series of novel titanium(IV) complexes bearing monoanionic [O^-NX] (X = O, S, Se) ligands isdesigned by sidearm approach. These complexes were synthesized, characterized, and employed as catalystsin ethylene homo- and copolymerization. X-ray diffraction studies on these new compounds reveal adistorted octahedral coordination of the central metal with the three chlorine ligands in a mer disposition.In the presence of modified methylaluminoxane (MMAO), they exhibit moderate to high activity andafford highly linear polyethylene. Variation of the sidearm, including different heteroatom and substituents,proves to modulate both the catalytic activity and the molecular weight of the resulting polyethylene.The complexes also show excellent capability in copolymerization of ethylene with 1-hexene.