Bis(imidodithiodiphosphinato) Titanium and Zirconium Complexes: Synthesis, Characterization, and Their Catalytic Activity in the Polymerization of alpha-Olefins

Fapu Chen, Moshe Kapon, J. Derek Woollins, Moris S. Eisen

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

The synthesis, characterization, and low-temperature crystal structures of a family of group 4 complexes containing different numbers of imidodithiodiphosphinate ligands and different metal oxidation states is presented. Their catalytic activity in the polymerization of ethylene and propylene was studied. For ethylene, when these complexes are activated with methylalumoxane (MAO), they are active catalysts in the polymerization producing extremely high molecular weight, high-density polyethylene with very narrow polydispersities. However, for propylene, the activity of these complexes is low, producing only atactic polypropylene. The bis(imidodithiodiphosphinate)titanium(bis(amido)) complex 6e has a singular reactivity, which upon heating forms the corresponding imido complex with the concomitant elimination of Et3N and the formation of the homoleptic complex tris(imidodithiodiphosphinate)titanium(III) (6h).

Original languageEnglish
Pages (from-to)2391-2400
Number of pages10
JournalOrganometallics
Volume28
Issue number8
DOIs
Publication statusPublished - 27 Apr 2009

Keywords

  • GROUP-4 BENZAMIDINATE COMPLEXES
  • CONSTRAINED-GEOMETRY CATALYSTS
  • ELASTOMERIC POLYPROPYLENE
  • ETHYLENE POLYMERIZATION
  • METALLOCENE CATALYSTS
  • MOLECULAR-STRUCTURE
  • CRYSTAL-STRUCTURE
  • OCTAHEDRAL COMPLEXES
  • BINUCLEAR CATALYSTS
  • DICHLORIDE COMPLEX

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