1-(2,6-Dibenzhydryl-4-fluorophenylimino)-2-aryliminoacenaphthylylnickel Halides Highly Polymerizing Ethylene for the Polyethylenes with High Branches and Molecular Weights

摘要

A series of 1-(2,6-dibenzhydryl-4-fluorophenylimino)- 2-aryliminoacenaphthylene derivatives (L1-L5) and their halonickel complexes LNiX2 (X=Br, Ni1-Ni5; X=Cl, Ni6-Ni10) are synthesized and well characterized. The molecular structures of representative complexes Ni2 and Ni4 are confirmed as the distorted tetrahedron geometry around nickel atom by the single crystal X-ray diffraction. Upon activation with methylaluminoxane, all nickel complexes show high activities up to 1.49 x 10(7) g of PE (mol of Ni)(-1) h(-1) toward ethylene polymerization, producing polyethylenes with high branches and molecular weights up to 1.62 x 10(6) g mol(-1) as well as narrow polydispersity. (c) 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015, 53, 1369-1378