Ethylene polymerization catalyzed by substituted pyrazole nickel complexes

Simphiwe M. Nelana; James Darkwa; Ilia A. Guzei; Selwyn F. Mapolie

doi:10.1016/j.jorganchem.2004.03.005

Ethylene polymerization catalyzed by substituted pyrazole nickel complexes

Simphiwe M. Nelana, James Darkwa, Ilia A. Guzei, Selwyn F. Mapolie

Research output: Contribution to journal › Article › peer-review

45 Citations (Scopus)

Abstract

(Pyrazole)nickel dibromide complexes, (3,5-Me₂pz)₂NiBr₂ (1), (3-Mepz)₄NiBr₂ (2), (pz)₄NiBr₂ (3) and (3,5-^tBu₂pz)₂NiBr₂ (4), were prepared by the reaction of the appropriate pyrazole with (DME)NiBr₂. Solid-state structures of these complexes show a direct relation between the steric bulk of the pyrazole ligand and structure, with more bulky ligands forming four-coordinate complexes (1 and 4) whereas the less bulky ligands formed six-coordinate complexes (2 and 3). Activation of selected complexes (1 and 3) with methylaluminoxane (MAO) produced species that catalyzed the polymerization of ethylene to form high density polyethylene.

Original language	English
Pages (from-to)	1835-1842
Number of pages	8
Journal	Journal of Organometallic Chemistry
Volume	689
Issue number	10
DOIs	https://doi.org/10.1016/j.jorganchem.2004.03.005
Publication status	Published - 15 May 2004
Externally published	Yes

Keywords

Ethylene polymerization
Nickel
Pyrazole
Solid-state structures

ASJC Scopus subject areas

Biochemistry
Physical and Theoretical Chemistry
Organic Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/j.jorganchem.2004.03.005

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title = "Ethylene polymerization catalyzed by substituted pyrazole nickel complexes",

abstract = "(Pyrazole)nickel dibromide complexes, (3,5-Me2pz)2NiBr2 (1), (3-Mepz)4NiBr2 (2), (pz)4NiBr2 (3) and (3,5-tBu2pz)2NiBr2 (4), were prepared by the reaction of the appropriate pyrazole with (DME)NiBr2. Solid-state structures of these complexes show a direct relation between the steric bulk of the pyrazole ligand and structure, with more bulky ligands forming four-coordinate complexes (1 and 4) whereas the less bulky ligands formed six-coordinate complexes (2 and 3). Activation of selected complexes (1 and 3) with methylaluminoxane (MAO) produced species that catalyzed the polymerization of ethylene to form high density polyethylene.",

keywords = "Ethylene polymerization, Nickel, Pyrazole, Solid-state structures",

author = "Nelana, {Simphiwe M.} and James Darkwa and Guzei, {Ilia A.} and Mapolie, {Selwyn F.}",

year = "2004",

month = may,

day = "15",

doi = "10.1016/j.jorganchem.2004.03.005",

language = "English",

volume = "689",

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journal = "Journal of Organometallic Chemistry",

issn = "0022-328X",

publisher = "Elsevier",

number = "10",

}

TY - JOUR

T1 - Ethylene polymerization catalyzed by substituted pyrazole nickel complexes

AU - Nelana, Simphiwe M.

AU - Darkwa, James

AU - Guzei, Ilia A.

AU - Mapolie, Selwyn F.

PY - 2004/5/15

Y1 - 2004/5/15

N2 - (Pyrazole)nickel dibromide complexes, (3,5-Me2pz)2NiBr2 (1), (3-Mepz)4NiBr2 (2), (pz)4NiBr2 (3) and (3,5-tBu2pz)2NiBr2 (4), were prepared by the reaction of the appropriate pyrazole with (DME)NiBr2. Solid-state structures of these complexes show a direct relation between the steric bulk of the pyrazole ligand and structure, with more bulky ligands forming four-coordinate complexes (1 and 4) whereas the less bulky ligands formed six-coordinate complexes (2 and 3). Activation of selected complexes (1 and 3) with methylaluminoxane (MAO) produced species that catalyzed the polymerization of ethylene to form high density polyethylene.

AB - (Pyrazole)nickel dibromide complexes, (3,5-Me2pz)2NiBr2 (1), (3-Mepz)4NiBr2 (2), (pz)4NiBr2 (3) and (3,5-tBu2pz)2NiBr2 (4), were prepared by the reaction of the appropriate pyrazole with (DME)NiBr2. Solid-state structures of these complexes show a direct relation between the steric bulk of the pyrazole ligand and structure, with more bulky ligands forming four-coordinate complexes (1 and 4) whereas the less bulky ligands formed six-coordinate complexes (2 and 3). Activation of selected complexes (1 and 3) with methylaluminoxane (MAO) produced species that catalyzed the polymerization of ethylene to form high density polyethylene.

KW - Ethylene polymerization

KW - Nickel

KW - Pyrazole

KW - Solid-state structures

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U2 - 10.1016/j.jorganchem.2004.03.005

DO - 10.1016/j.jorganchem.2004.03.005

M3 - Article

AN - SCOPUS:1842843021

SN - 0022-328X

VL - 689

SP - 1835

EP - 1842

JO - Journal of Organometallic Chemistry

JF - Journal of Organometallic Chemistry

IS - 10

ER -

Ethylene polymerization catalyzed by substituted pyrazole nickel complexes

Abstract

Keywords

ASJC Scopus subject areas

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