Highly Active Binuclear Neutral Nickel(II) Catalysts Affording High Molecular Weight Polyethylene

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2008
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Wehrmann, Peter
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A series of new binuclear neutral κ2-N,O-chelated Ni(II) complexes [(H2C)n{[(2,6-R2-4-yl-C6H2)-N =C(H)-(3,5-I2-2-O-C6H2)-κ2-N,O]Ni(CH3)(pyridine)}2](R = iPr, 3,5-(CF3)2C6H3; n = 0, 1) are reported. The complexes are single-component catalyst precursors for ethylene polymerization. Catalyst activities exceed those of mononuclear analogues studied substantially. With 3.4 × 105 TO h-1, high molecular weight polymer is obtained (Mw 9.2 × 105 g mol-1; Mn 2.8 × 105 g mol-1). Semicrystalline polyethylene with a low degree of branching is formed (2 to 12 branches/1000 carbon atoms; prepared at 30 to 70 °C polymerization temperature), with Tm 112 to 136 °C. Polymerization in aqueous emulsion affords polyethylene dispersions.

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ISO 690WEHRMANN, Peter, Stefan MECKING, 2008. Highly Active Binuclear Neutral Nickel(II) Catalysts Affording High Molecular Weight Polyethylene. In: Organometallics. 2008, 27(7), pp. 1399-1408. ISSN 0276-7333. eISSN 1520-6041. Available under: doi: 10.1021/om700942z
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@article{Wehrmann2008Highl-9660,
  year={2008},
  doi={10.1021/om700942z},
  title={Highly Active Binuclear Neutral Nickel(II) Catalysts Affording High Molecular Weight Polyethylene},
  number={7},
  volume={27},
  issn={0276-7333},
  journal={Organometallics},
  pages={1399--1408},
  author={Wehrmann, Peter and Mecking, Stefan}
}
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