Abstract
A series of biphenyl-bridged 6-(1-aryliminoethyl)-2-iminopyridine derivatives reacted with cobalt dichloride in dichloromethane/ethanol to afford the corresponding binuclear cobalt complexes. The cobalt complexes were characterized by FT-IR spectroscopy and elemental analysis, and the structure of a representative complex was confirmed by single-crystal X-ray diffraction. Upon activation with either MAO or MMAO, these cobalt complexes performed with high activities of up to 1.2 × 107 g (mol of Co)−1 h–1 in ethylene polymerization, which represents one of the most active cobalt-based catalytic systems in ethylene reactivity. These biphenyl-bridged bis(imino)pyridylcobalt precatalysts exhibited higher activities than did their mononuclear bis(imino)pyridylcobalt precatalyst counterparts, and more importantly, the binuclear precatalysts revealed a better thermal stability and longer lifetimes. The polyethylenes obtained were characterized by GPC, DSC, and high-temperature NMR spectroscopy and mostly possessed unimodal and highly linear features.
Highlights
2,6-Bis(imino)pyridylmetal complexes were found to act as highly active precatalysts in ethylene polymerization back in the 1990s.1 Subsequently, researchers from both academia and industry have extensively explored various ligand sets through modification of
Biphenyl-bridged 2,6-bis(imino)pyridylmetal complex pre-catalysts (M = Fe13 and currently Co). Binuclear complexes and their catalytic behavior in ethylene reactivity have been an important topic in our research group.[14]
The cobalt analogues performed with high activity in ethylene polymerization producing linear polyethylene, and this is one of most active cobalt pre-catalysts reported
Summary
2,6-Bis(imino)pyridylmetal (iron or cobalt) complexes were found to act as highly active precatalysts in ethylene polymerization back in the 1990s.1 Subsequently, researchers from both academia and industry have extensively explored various ligand sets through modification of. 2,6-Bis(imino)pyridylmetal (iron or cobalt) complexes were found to act as highly active precatalysts in ethylene polymerization back in the 1990s.1. Researchers from both academia and industry have extensively explored various ligand sets through modification of. Binuclear complexes and their catalytic behavior in ethylene reactivity have been an important topic in our research group.[14] Recently, the biphenyl-bridged 2,6-bis(imino)pyridyliron complexes were revisited and were shown to exhibit high ethylene polymerization activity with enhanced thermo-stability. The synthesis and characterization of the cobalt complexes are reported, and the ethylene polymerization behavior is discussed
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