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Tailoring Polyethylenes by Nickel Complexes Bearing Modified 1‑(2-Benzhydrylnaphthylimino)-2-phenyliminoacenaphthylene Derivatives
A series of 1-(2-benzhydrylnaphthylimino)-2-phenyliminoacenaphthylene
derivatives (<b>L1</b>–<b>L5</b>) was synthesized,
characterized, and then reacted with (DME)NiBr<sub>2</sub> to form
the corresponding [1-(2-benzhydrylnaphthylimino)-2-phenyliminoacenaphthyl]nickel
bromides (<b>C1</b>–<b>C5</b>). All nickel complexes
were fully characterized by their FT-IR spectra and elemental analysis.
The molecular structures of the representative complexes <b>C1</b> and <b>C4</b> were also determined by single-crystal X-ray
diffraction. On activation with either methylaluminoxane (MAO) or
diethylaluminum chloride (Et<sub>2</sub>AlCl), all title nickel complexes
showed high activities toward ethylene polymerization; the resulting
polyethylenes showed molecular weights higher than those obtained
by using the nickel analogues bearing (2-benzhydrylnaphthylimino)pyridines
and also had branches lower than those obtained by using other diiminoacenaphthylnickel
analogues. Therefore, the modification of ligands could affect the
catalytic behavior of their nickel complexes in order to tailor the
molecular weights and branches of the resulting polyethylenes