Electronic effects in homogeneous indenylzirconium Ziegler-Natta catalysts

Journal Article · Sat Dec 01 00:00:00 EST 1990 · Organometallics; (United States)

DOI:https://doi.org/10.1021/om00162a022· OSTI ID:6109611

Piccolrovazzi, N; Pino, P; Consiglio, G ^[1]; Sironi, A; Moret, M ^[2]

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1. Swiss Federal Inst. of Tech., Zuerich (Switzerland)
2. Univ. di Milano (Italy)

A series of new bis(indenyl)zirconium(IV) complexes of the general formula ({eta}{sup 5}-4,7-X{sub 2}C{sub 9}H{sub 5}){sub 2}ZrCl{sub 2} and ({eta}{sup 5}-4,7-X{sub 2}C{sub 9}H{sub 5}){sub 2}Zr(CH{sub 2}H{sub 5}){sub 2} (where X = H, CH{sub 3}, OCH{sub 3}, and F) were synthesized in order to investigate the electronic effects of substitutents on the nature of the catalytic species in homogeneous Ziegler-Natta catalysts. By use of poly(methylaluminoxane) as cocatalyst, the activity of these complexes as catalyst precursors in the polymerization of ethylene was examined. The substitution with electron-withdrawing groups resulted in a decrease of both molecular weights and productivity, whereas in the case of electron donors, like methyl groups, no significant change in productivity and average molecular weight was observed. These effects support the hypothesis of a polar or ionic character of the catalytic species. The molecular structure of ({eta}{sup 5}-4,7-F{sub 2}C{sub 9}H{sub 5}){sub 2}Zr(CH{sub 2}H{sub 5}){sub 2} was determined by X-ray diffraction.

• OSTI ID: 6109611
• Journal Information: Organometallics; (United States), Vol. 9:12; ISSN 0276-7333
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
ETHYLENE
POLYMERIZATION
ZIRCONIUM COMPLEXES
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
ALDEHYDES
ALUMINIUM BROMIDES
ALUMINIUM CHLORIDES
BOND ANGLE
BOND LENGTHS
CARBON SULFIDES
FRIEDEL-CRAFTS REACTION
INDENE
KETONES
MASS SPECTRA
MOLECULAR STRUCTURE
NMR SPECTRA
REDUCTION
TETRAHYDROFURAN
X-RAY DIFFRACTION
ZIEGLER CATALYST
ALKENES
ALUMINIUM COMPOUNDS
AROMATICS
BROMIDES
BROMINE COMPOUNDS
CARBON COMPOUNDS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COHERENT SCATTERING
COMPLEXES
CONDENSED AROMATICS
DIFFRACTION
DIMENSIONS
FURANS
HALIDES
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
KINETICS
LENGTH
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
REACTION KINETICS
SCATTERING
SPECTRA
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPLEXES
400201* - Chemical & Physicochemical Properties
020400 - Petroleum- Processing