Vinyl-addition polymerization of norbornene catalyzed by (pyrazol-1-ylmethyl)pyridine divalent iron, cobalt and nickel complexes

Letitia L. Benade; Stephen O. Ojwach; Collins Obuah; Ilia A. Guzei; James Darkwa

doi:10.1016/j.poly.2011.08.021

Vinyl-addition polymerization of norbornene catalyzed by (pyrazol-1-ylmethyl)pyridine divalent iron, cobalt and nickel complexes

Letitia L. Benade, Stephen O. Ojwach, Collins Obuah, Ilia A. Guzei, James Darkwa

Chemical Sciences

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

21 Citations (Scopus)

Abstract

Complexes of 2-((3,5-dimethyl)-1H-pyrazol-1-ylmethyl)pyridine (L1), 2-((3,5-ditert-butyl-1H-pyrazol-1-yl)methyl)pyridine (L2), 2-((3,5-diphenyl)-1H- pyrazol-1-yl)methyl)pyridine (L3), 2-((3,5-bis(trifluoromethyl)-1H-pyrazol-1- ylmethyl)pyridine (L4) and 2,6-bis(3,5-dimethyl-1H-pyrazol-1-yl)methyl)pyridine (L5) with cobalt(II), iron(II) and nickel(II), Ni(L1)Cl₂ (1), Co(L1)Cl₂ (2), Fe(L1)Cl₂ (3), Ni(L2)Cl₂ (4), Ni(L3)Cl₂ (5), Co(L3)Cl₂ (6), Fe(L3)Cl₂ (7), Ni(L4)Cl₂ (8) and Ni(L5)Cl₂ (9), were used as catalyst precursors to produce vinyl-addition type norbornene polymers. Both the identity of the metal center and nature of ligand affected the polymerization behaviour of the resultant catalysts. Nickel catalysts were generally more active than the corresponding iron and cobalt analogues. The polynorbornene produced have high molecular weights (0.5-2.1 × 10⁶ g/mol) and narrow molecular weight distributions. Analyses of polymer microstructure using NMR and IR spectroscopy confirmed the polymers produced to be vinyl-addition polynorbornene.

Original language	English
Pages (from-to)	2878-2883
Number of pages	6
Journal	Polyhedron
Volume	30
Issue number	17
DOIs	https://doi.org/10.1016/j.poly.2011.08.021
Publication status	Published - 3 Nov 2011

Keywords

Cobalt
Iron
Nickel catalysts
Norbornene polymerization
Structures

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/j.poly.2011.08.021

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@article{9be658bfb513441d9a886c9501bc186b,

title = "Vinyl-addition polymerization of norbornene catalyzed by (pyrazol-1-ylmethyl)pyridine divalent iron, cobalt and nickel complexes",

abstract = "Complexes of 2-((3,5-dimethyl)-1H-pyrazol-1-ylmethyl)pyridine (L1), 2-((3,5-ditert-butyl-1H-pyrazol-1-yl)methyl)pyridine (L2), 2-((3,5-diphenyl)-1H- pyrazol-1-yl)methyl)pyridine (L3), 2-((3,5-bis(trifluoromethyl)-1H-pyrazol-1- ylmethyl)pyridine (L4) and 2,6-bis(3,5-dimethyl-1H-pyrazol-1-yl)methyl)pyridine (L5) with cobalt(II), iron(II) and nickel(II), Ni(L1)Cl2 (1), Co(L1)Cl2 (2), Fe(L1)Cl2 (3), Ni(L2)Cl2 (4), Ni(L3)Cl2 (5), Co(L3)Cl2 (6), Fe(L3)Cl2 (7), Ni(L4)Cl2 (8) and Ni(L5)Cl2 (9), were used as catalyst precursors to produce vinyl-addition type norbornene polymers. Both the identity of the metal center and nature of ligand affected the polymerization behaviour of the resultant catalysts. Nickel catalysts were generally more active than the corresponding iron and cobalt analogues. The polynorbornene produced have high molecular weights (0.5-2.1 × 106 g/mol) and narrow molecular weight distributions. Analyses of polymer microstructure using NMR and IR spectroscopy confirmed the polymers produced to be vinyl-addition polynorbornene.",

keywords = "Cobalt, Iron, Nickel catalysts, Norbornene polymerization, Structures",

author = "Benade, {Letitia L.} and Ojwach, {Stephen O.} and Collins Obuah and Guzei, {Ilia A.} and James Darkwa",

year = "2011",

month = nov,

day = "3",

doi = "10.1016/j.poly.2011.08.021",

language = "English",

volume = "30",

pages = "2878--2883",

journal = "Polyhedron",

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TY - JOUR

T1 - Vinyl-addition polymerization of norbornene catalyzed by (pyrazol-1-ylmethyl)pyridine divalent iron, cobalt and nickel complexes

AU - Benade, Letitia L.

AU - Ojwach, Stephen O.

AU - Obuah, Collins

AU - Guzei, Ilia A.

AU - Darkwa, James

PY - 2011/11/3

Y1 - 2011/11/3

N2 - Complexes of 2-((3,5-dimethyl)-1H-pyrazol-1-ylmethyl)pyridine (L1), 2-((3,5-ditert-butyl-1H-pyrazol-1-yl)methyl)pyridine (L2), 2-((3,5-diphenyl)-1H- pyrazol-1-yl)methyl)pyridine (L3), 2-((3,5-bis(trifluoromethyl)-1H-pyrazol-1- ylmethyl)pyridine (L4) and 2,6-bis(3,5-dimethyl-1H-pyrazol-1-yl)methyl)pyridine (L5) with cobalt(II), iron(II) and nickel(II), Ni(L1)Cl2 (1), Co(L1)Cl2 (2), Fe(L1)Cl2 (3), Ni(L2)Cl2 (4), Ni(L3)Cl2 (5), Co(L3)Cl2 (6), Fe(L3)Cl2 (7), Ni(L4)Cl2 (8) and Ni(L5)Cl2 (9), were used as catalyst precursors to produce vinyl-addition type norbornene polymers. Both the identity of the metal center and nature of ligand affected the polymerization behaviour of the resultant catalysts. Nickel catalysts were generally more active than the corresponding iron and cobalt analogues. The polynorbornene produced have high molecular weights (0.5-2.1 × 106 g/mol) and narrow molecular weight distributions. Analyses of polymer microstructure using NMR and IR spectroscopy confirmed the polymers produced to be vinyl-addition polynorbornene.

AB - Complexes of 2-((3,5-dimethyl)-1H-pyrazol-1-ylmethyl)pyridine (L1), 2-((3,5-ditert-butyl-1H-pyrazol-1-yl)methyl)pyridine (L2), 2-((3,5-diphenyl)-1H- pyrazol-1-yl)methyl)pyridine (L3), 2-((3,5-bis(trifluoromethyl)-1H-pyrazol-1- ylmethyl)pyridine (L4) and 2,6-bis(3,5-dimethyl-1H-pyrazol-1-yl)methyl)pyridine (L5) with cobalt(II), iron(II) and nickel(II), Ni(L1)Cl2 (1), Co(L1)Cl2 (2), Fe(L1)Cl2 (3), Ni(L2)Cl2 (4), Ni(L3)Cl2 (5), Co(L3)Cl2 (6), Fe(L3)Cl2 (7), Ni(L4)Cl2 (8) and Ni(L5)Cl2 (9), were used as catalyst precursors to produce vinyl-addition type norbornene polymers. Both the identity of the metal center and nature of ligand affected the polymerization behaviour of the resultant catalysts. Nickel catalysts were generally more active than the corresponding iron and cobalt analogues. The polynorbornene produced have high molecular weights (0.5-2.1 × 106 g/mol) and narrow molecular weight distributions. Analyses of polymer microstructure using NMR and IR spectroscopy confirmed the polymers produced to be vinyl-addition polynorbornene.

KW - Cobalt

KW - Iron

KW - Nickel catalysts

KW - Norbornene polymerization

KW - Structures

UR - http://www.scopus.com/inward/record.url?scp=80053941494&partnerID=8YFLogxK

U2 - 10.1016/j.poly.2011.08.021

DO - 10.1016/j.poly.2011.08.021

M3 - Article

AN - SCOPUS:80053941494

SN - 0277-5387

VL - 30

SP - 2878

EP - 2883

JO - Polyhedron

JF - Polyhedron

IS - 17

ER -

Vinyl-addition polymerization of norbornene catalyzed by (pyrazol-1-ylmethyl)pyridine divalent iron, cobalt and nickel complexes

Abstract

Keywords

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