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

Wehrmann, Peter; Mecking, Stefan

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

Files

Highly_Active_Binuclear_Neutral_Nickel.pdf(1.71 MB)

Date

2008

Authors

Wehrmann, Peter

Mecking, Stefan

Publication type

Journal article

Published in

Organometallics ; 27 (2008), 7. - pp. 1399-1408. - ISSN 0276-7333. - eISSN 1520-6041

Abstract

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.

Subject (DDC)

540 Chemistry

Cite This

ISO 690

WEHRMANN, Peter, Stefan MECKING, 2008. Highly Active Binuclear Neutral Nickel(II) Catalysts Affording High Molecular Weight Polyethylene. In: Organometallics. 27(7), pp. 1399-1408. ISSN 0276-7333. eISSN 1520-6041. Available under: doi: 10.1021/om700942z

BibTex

@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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