Propene polymerization using ansa-metallocenium ions: Excess activator effects on polymerization activity and polymer microstructure

Abdulaziz Al-Humydi, Jered C. Garrison, Wiley J. Youngs, Scott Collins

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The initial and steady-state rates of propene polymerization using the metallocene complexes Me 2X-(Cp)IndZrMe 2 (1, X = C, Si) and Me 2C(Cp)FluZrMe 2 (2) activated with B(C 6F 5) 3 increase in the presence of excess borane; the kinetic data are consistent with two different forms of the propagating catalyst in equilibrium with each other in the presence of excess borane. The ratio kplki for the ion pair [Me 2C(Cp)IndZrMe][MeB(C 6F 5) 3] (3) is sensitive to the presence of excess borane, while the molecular structure of 3 reveals strong ion pairing in the solid state. Variable-temperature NMR spectra of (Me 2C(Cp)IndZr 13Me][ 13 MeB(C 6F 5) 3] in the presence of excess borane are consistent with the doubly activated intermediate Me 2C(Cp)IndZr{(μ- 13Me)B(C 6F 5) 3} 2 (4) being present.

Original languageEnglish (US)
Pages (from-to)193-196
Number of pages4
JournalOrganometallics
Volume24
Issue number2
DOIs
StatePublished - Jan 17 2005

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Boranes
boranes
Polymers
polymerization
Polymerization
Ions
microstructure
Microstructure
polymers
ions
Molecular structure
molecular structure
Nuclear magnetic resonance
solid state
catalysts
nuclear magnetic resonance
Catalysts
Kinetics
propylene
kinetics

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

Cite this

Propene polymerization using ansa-metallocenium ions : Excess activator effects on polymerization activity and polymer microstructure. / Al-Humydi, Abdulaziz; Garrison, Jered C.; Youngs, Wiley J.; Collins, Scott.

In: Organometallics, Vol. 24, No. 2, 17.01.2005, p. 193-196.

Research output: Contribution to journalArticle

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abstract = "The initial and steady-state rates of propene polymerization using the metallocene complexes Me 2X-(Cp)IndZrMe 2 (1, X = C, Si) and Me 2C(Cp)FluZrMe 2 (2) activated with B(C 6F 5) 3 increase in the presence of excess borane; the kinetic data are consistent with two different forms of the propagating catalyst in equilibrium with each other in the presence of excess borane. The ratio kplki for the ion pair [Me 2C(Cp)IndZrMe][MeB(C 6F 5) 3] (3) is sensitive to the presence of excess borane, while the molecular structure of 3 reveals strong ion pairing in the solid state. Variable-temperature NMR spectra of (Me 2C(Cp)IndZr 13Me][ 13 MeB(C 6F 5) 3] in the presence of excess borane are consistent with the doubly activated intermediate Me 2C(Cp)IndZr{(μ- 13Me)B(C 6F 5) 3} 2 (4) being present.",
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AB - The initial and steady-state rates of propene polymerization using the metallocene complexes Me 2X-(Cp)IndZrMe 2 (1, X = C, Si) and Me 2C(Cp)FluZrMe 2 (2) activated with B(C 6F 5) 3 increase in the presence of excess borane; the kinetic data are consistent with two different forms of the propagating catalyst in equilibrium with each other in the presence of excess borane. The ratio kplki for the ion pair [Me 2C(Cp)IndZrMe][MeB(C 6F 5) 3] (3) is sensitive to the presence of excess borane, while the molecular structure of 3 reveals strong ion pairing in the solid state. Variable-temperature NMR spectra of (Me 2C(Cp)IndZr 13Me][ 13 MeB(C 6F 5) 3] in the presence of excess borane are consistent with the doubly activated intermediate Me 2C(Cp)IndZr{(μ- 13Me)B(C 6F 5) 3} 2 (4) being present.

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