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• W2026109095 abstract "A series of new mono β-diiminato titanium complexes [(N(Ar)C(CH3))2 CH]TiCl3 (3a: Ar = 2.6-F2C6H3; 3b: Ar = C6F5; 3c: Ar = 2.6-Me2C6H3) have been synthesized and characterized. The crystal structure of 3a revealed that the β-diiminato ligand in our complex is more close to the η2-coordination mode with little delocalization of the double bonds, which is different from the strong delocalization in the ligands of η5-coordinated (Tolnacnac)TiCl3 and η2-coordinated (Dipnacnac)ZrCl3. The significant electronic effects of fluoro-substituents on the olefin polymerization activity of mono β-diiminato titanium complexes were found. Titanium complexes with fluorine-containing β-diiminato ligands, on activation with MMAO, are extremely active catalysts for polymerization of ethylene. The activity of copolymerization of ethylene and 1-hexene is higher than homopolymerization of ethylene and increases with the increase of 1-hexene concentrations, which show the positive “comonomer effect.” The molar percentage of 1-hexene incorporation and polymer microstructures can also be modulated by the initial comonomer concentrations. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 211–217, 2008" @default.
• W2026109095 created "2016-06-24" @default.
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• W2026109095 date "2007-01-01" @default.
• W2026109095 modified "2023-09-23" @default.
• W2026109095 title "Dramatic electronic effect of fluoro substituents on the olefin polymerization activity of mono β-diiminato titanium complexes" @default.
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• W2026109095 doi "https://doi.org/10.1002/pola.22373" @default.
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