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

doi:10.1021/om0492092

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 journal › Article › peer-review

30 Scopus citations

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 language	English (US)
Pages (from-to)	193-196
Number of pages	4
Journal	Organometallics
Volume	24
Issue number	2
DOIs	https://doi.org/10.1021/om0492092
State	Published - Jan 17 2005
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Organic Chemistry
Inorganic Chemistry

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@article{0d62fe060cd74b6f89ead97cd443fa4e,

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

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.",

author = "Abdulaziz Al-Humydi and Garrison, {Jered C.} and Youngs, {Wiley J.} and Scott Collins",

year = "2005",

month = jan,

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doi = "10.1021/om0492092",

language = "English (US)",

volume = "24",

pages = "193--196",

journal = "Organometallics",

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publisher = "American Chemical Society",

number = "2",

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TY - JOUR

T1 - Propene polymerization using ansa-metallocenium ions

T2 - Excess activator effects on polymerization activity and polymer microstructure

AU - Al-Humydi, Abdulaziz

AU - Garrison, Jered C.

AU - Youngs, Wiley J.

AU - Collins, Scott

PY - 2005/1/17

Y1 - 2005/1/17

N2 - 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.

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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JO - Organometallics

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IS - 2

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

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