Bis(pyrazole)- and bis(pyrazolyl)-palladium complexes as phenylacetylene polymerization catalysts

Kelin Li; M. Sarah Mohlala; Tebogo V. Segapelo; Poslet M. Shumbula; Ilia A. Guzei; James Darkwa

doi:10.1016/j.poly.2007.11.033

Bis(pyrazole)- and bis(pyrazolyl)-palladium complexes as phenylacetylene polymerization catalysts

Kelin Li, M. Sarah Mohlala, Tebogo V. Segapelo, Poslet M. Shumbula, Ilia A. Guzei, James Darkwa

Chemical Sciences

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

29 Citations (Scopus)

Abstract

Two types of pyrazole-based palladium complexes were used to catalyze the polymerization of phenylacetylene. Catalysts with electron-withdrawing linkers, [{1,3-(3,5-R₂pzCO)₂C₆H₄}Pd₂Cl₂(μ-Cl)₂] (R =^tBu (1), Ph (2), Me (3), [{2,6-(3,5-R₂pzCO)₂C₅H₃N)}PdCl₂] (R =^tBu (4), Me (5)), show high conversion; whilst those with simple pyrazole ligands, [(3,5-R₂pz)₂PdCl₂] (R = H (6), Me (7), ^tBu (8)), [(3,5-^tBu₂pz)₂PdCl(Me)] (9), have much lower conversions. Conversion greatly improved when 9 was used to catalyze the co-polymerization of sulfur dioxide and phenylacetylene. Both types of catalysts produce predominantly trans-cisoidal polyphenylacetylene.

Original language	English
Pages (from-to)	1017-1023
Number of pages	7
Journal	Polyhedron
Volume	27
Issue number	3
DOIs	https://doi.org/10.1016/j.poly.2007.11.033
Publication status	Published - 26 Feb 2008

Keywords

Catalysts
Palladium complexes
Phenylacetylene
Polymerization
Pyrazole
Pyrazolyl

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/j.poly.2007.11.033

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title = "Bis(pyrazole)- and bis(pyrazolyl)-palladium complexes as phenylacetylene polymerization catalysts",

abstract = "Two types of pyrazole-based palladium complexes were used to catalyze the polymerization of phenylacetylene. Catalysts with electron-withdrawing linkers, [{1,3-(3,5-R2pzCO)2C6H4}Pd2Cl2(μ-Cl)2] (R = tBu (1), Ph (2), Me (3), [{2,6-(3,5-R2pzCO)2C5H3N)}PdCl2] (R = tBu (4), Me (5)), show high conversion; whilst those with simple pyrazole ligands, [(3,5-R2pz)2PdCl2] (R = H (6), Me (7), tBu (8)), [(3,5-tBu2pz)2PdCl(Me)] (9), have much lower conversions. Conversion greatly improved when 9 was used to catalyze the co-polymerization of sulfur dioxide and phenylacetylene. Both types of catalysts produce predominantly trans-cisoidal polyphenylacetylene.",

keywords = "Catalysts, Palladium complexes, Phenylacetylene, Polymerization, Pyrazole, Pyrazolyl",

author = "Kelin Li and Mohlala, {M. Sarah} and Segapelo, {Tebogo V.} and Shumbula, {Poslet M.} and Guzei, {Ilia A.} and James Darkwa",

year = "2008",

month = feb,

day = "26",

doi = "10.1016/j.poly.2007.11.033",

language = "English",

volume = "27",

pages = "1017--1023",

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T1 - Bis(pyrazole)- and bis(pyrazolyl)-palladium complexes as phenylacetylene polymerization catalysts

AU - Li, Kelin

AU - Mohlala, M. Sarah

AU - Segapelo, Tebogo V.

AU - Shumbula, Poslet M.

AU - Guzei, Ilia A.

AU - Darkwa, James

PY - 2008/2/26

Y1 - 2008/2/26

N2 - Two types of pyrazole-based palladium complexes were used to catalyze the polymerization of phenylacetylene. Catalysts with electron-withdrawing linkers, [{1,3-(3,5-R2pzCO)2C6H4}Pd2Cl2(μ-Cl)2] (R = tBu (1), Ph (2), Me (3), [{2,6-(3,5-R2pzCO)2C5H3N)}PdCl2] (R = tBu (4), Me (5)), show high conversion; whilst those with simple pyrazole ligands, [(3,5-R2pz)2PdCl2] (R = H (6), Me (7), tBu (8)), [(3,5-tBu2pz)2PdCl(Me)] (9), have much lower conversions. Conversion greatly improved when 9 was used to catalyze the co-polymerization of sulfur dioxide and phenylacetylene. Both types of catalysts produce predominantly trans-cisoidal polyphenylacetylene.

AB - Two types of pyrazole-based palladium complexes were used to catalyze the polymerization of phenylacetylene. Catalysts with electron-withdrawing linkers, [{1,3-(3,5-R2pzCO)2C6H4}Pd2Cl2(μ-Cl)2] (R = tBu (1), Ph (2), Me (3), [{2,6-(3,5-R2pzCO)2C5H3N)}PdCl2] (R = tBu (4), Me (5)), show high conversion; whilst those with simple pyrazole ligands, [(3,5-R2pz)2PdCl2] (R = H (6), Me (7), tBu (8)), [(3,5-tBu2pz)2PdCl(Me)] (9), have much lower conversions. Conversion greatly improved when 9 was used to catalyze the co-polymerization of sulfur dioxide and phenylacetylene. Both types of catalysts produce predominantly trans-cisoidal polyphenylacetylene.

KW - Catalysts

KW - Palladium complexes

KW - Phenylacetylene

KW - Polymerization

KW - Pyrazole

KW - Pyrazolyl

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U2 - 10.1016/j.poly.2007.11.033

DO - 10.1016/j.poly.2007.11.033

M3 - Article

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SN - 0277-5387

VL - 27

SP - 1017

EP - 1023

JO - Polyhedron

JF - Polyhedron

IS - 3

ER -

Bis(pyrazole)- and bis(pyrazolyl)-palladium complexes as phenylacetylene polymerization catalysts

Abstract

Keywords

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