title: Bimetallic phenylene-bridged Cp/amide titanium complexes and their olefin polymerization.
abstract: Bimetallic dichlorotitanium complexes, {2,6-[eta(5)-2,5-Me2C5H2](2)-4-R-C6H2N-microN}{Ti(IV)Cl2}2 (, R=Me; , R=F) and 4,4'-A[{2-(eta(5)-2,3,5-Me3C5H)C6H3NC6H11-kappaN}Ti(IV)Cl2]2 (, A=CH2; , A=O; , A=ortho-C6H4) are prepared via a key step of the Suzuki-coupling reaction of 2-dihydroxyboryl-3-methyl-2-cyclopenten-1-one () with dibromo-compounds. The solid state structure of was determined by X-ray crystallography. Complexes and are not active for ethylene/1-hexene copolymerization. Meanwhile, the complexes are highly active and their activities are higher than that of the mononuclear analogue, {2-(eta(5)-2,3,5-Me3C5H)C6H3NC6H11-kappaN}Ti(IV)Cl2 (). The molecular weights of the polymers obtained with the bimetallic complexes are higher than that of the polymer obtained using . Slightly higher contents of long-chain-branching are observed for the copolymers obtained using the bimetallic system.
authors.affiliation: Department of Molecular Science and Technology, Suwon, 443-749, South Korea.
authors.forename: Sang Hoon
authors.initials: SH
authors.lastname: Lee
authors.forename: Chun Ji
authors.initials: CJ
authors.lastname: Wu
authors.forename: Ui Gab
authors.initials: UG
authors.lastname: Joung
authors.forename: Bun Yeoul
authors.initials: BY
authors.lastname: Lee
authors.forename: Jinil
authors.initials: J
authors.lastname: Park
mesh_terms: D000475:Alkenes / Q000737:chemistry*; D000577:Amides / Q000737:chemistry*; D001555:Benzene Derivatives / Q000737:chemistry*; D002384:Catalysis; D003432:Cross-Linking Reagents / Q000737:chemistry*; D018360:Crystallography, X-Ray; D005030:Ethylenes / Q000737:chemistry; D008958:Models, Molecular; D015394:Molecular Structure; D011108:Polymers / Q000737:chemistry*; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D014783:Viscosity
chemical_list: D000475:Alkenes; D000577:Amides; D001555:Benzene Derivatives; D003432:Cross-Linking Reagents; D005030:Ethylenes; D011108:Polymers; C036216:ethylene; C117224:1-hexene; D014025:Titanium