(Ferrocenylpyrazolyl)zinc(II) acetate complexes as initiators and catalysts for the ring opening polymerization of ∈ -caprolacton

Collins Obuah; Yemanlall Lochee; Orpah Zinyemba; Johan H.L. Jordaan; Daniel P. Otto; James Darkwa

doi:10.1016/j.molcata.2015.05.021

(Ferrocenylpyrazolyl)zinc(II) acetate complexes as initiators and catalysts for the ring opening polymerization of ∈ -caprolacton

Collins Obuah
, Yemanlall Lochee
, Orpah Zinyemba
, Johan H.L. Jordaan
, Daniel P. Otto
, James Darkwa

Chemical Sciences

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

11 Citations (Scopus)

Abstract

The reaction of Zn(OAc)₂ with 3-ferrocenylpyrazol-1-ylmethylenepyridine (L1), 3-ferrocenyl-5-methylpyrazol-1-ylmethylenepyridine (L2), 3-ferrocenylpyrazol-1-ylethylamine (L3) and 3-ferrocenyl-5-pyrazol-1-ylethylamine (L4) afford the corresponding zinc complexes [Zn(CH₃COO)₂(L1)] (1), [Zn(CH₃COO)₂(L2)] (2), [Zn(CH₃COO)₂(L3)] (3), and [Zn(CH₃COO)₂(L4)] (4). These zinc complexes behave as catalysts or initiators for the ring opening polymerization of ∈ -caprolactone, depending on the nature of the ligands, to produce polymers that are capped with α,ω-dihydroxy, hydroxyl or ferrocenylpyrazolylethylamino end groups. Complexes 1 and 2 were found to act as catalysts when the [CL]/[C] ratios were varied from 100 to 800 to produce PCL with α,ω-dihydroxy and nearly the same molecular weight. Complexes 3 and 4 on the other hand act as initiators to produce a mixture of PCL that have polymers with ferrocenylpyrazolylethylamino and a hydroxyl as end groups as the major component of the mixture and minor species with α,ω-dihydroxy end group.

Original language	English
Pages (from-to)	185-193
Number of pages	9
Journal	Journal of Molecular Catalysis A: Chemical
Volume	406
DOIs	https://doi.org/10.1016/j.molcata.2015.05.021
Publication status	Published - 19 Jun 2015

Keywords

Catalysts
Ferrocenylpyrazolyl zinc(II) acetate
Initiators
Ring opening polymerization
∈ -Caprolactone

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology
Physical and Theoretical Chemistry

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10.1016/j.molcata.2015.05.021

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@article{e2737af175944fe0a70dd918c1c47d36,

title = "(Ferrocenylpyrazolyl)zinc(II) acetate complexes as initiators and catalysts for the ring opening polymerization of ∈ -caprolacton",

abstract = "The reaction of Zn(OAc)2 with 3-ferrocenylpyrazol-1-ylmethylenepyridine (L1), 3-ferrocenyl-5-methylpyrazol-1-ylmethylenepyridine (L2), 3-ferrocenylpyrazol-1-ylethylamine (L3) and 3-ferrocenyl-5-pyrazol-1-ylethylamine (L4) afford the corresponding zinc complexes [Zn(CH3COO)2(L1)] (1), [Zn(CH3COO)2(L2)] (2), [Zn(CH3COO)2(L3)] (3), and [Zn(CH3COO)2(L4)] (4). These zinc complexes behave as catalysts or initiators for the ring opening polymerization of ∈ -caprolactone, depending on the nature of the ligands, to produce polymers that are capped with α,ω-dihydroxy, hydroxyl or ferrocenylpyrazolylethylamino end groups. Complexes 1 and 2 were found to act as catalysts when the [CL]/[C] ratios were varied from 100 to 800 to produce PCL with α,ω-dihydroxy and nearly the same molecular weight. Complexes 3 and 4 on the other hand act as initiators to produce a mixture of PCL that have polymers with ferrocenylpyrazolylethylamino and a hydroxyl as end groups as the major component of the mixture and minor species with α,ω-dihydroxy end group.",

keywords = "Catalysts, Ferrocenylpyrazolyl zinc(II) acetate, Initiators, Ring opening polymerization, ∈ -Caprolactone",

author = "Collins Obuah and Yemanlall Lochee and Orpah Zinyemba and Jordaan, \{Johan H.L.\} and Otto, \{Daniel P.\} and James Darkwa",

year = "2015",

month = jun,

day = "19",

doi = "10.1016/j.molcata.2015.05.021",

language = "English",

volume = "406",

pages = "185--193",

journal = "Journal of Molecular Catalysis A: Chemical",

issn = "1381-1169",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - (Ferrocenylpyrazolyl)zinc(II) acetate complexes as initiators and catalysts for the ring opening polymerization of ∈ -caprolacton

AU - Obuah, Collins

AU - Lochee, Yemanlall

AU - Zinyemba, Orpah

AU - Jordaan, Johan H.L.

AU - Otto, Daniel P.

AU - Darkwa, James

PY - 2015/6/19

Y1 - 2015/6/19

N2 - The reaction of Zn(OAc)2 with 3-ferrocenylpyrazol-1-ylmethylenepyridine (L1), 3-ferrocenyl-5-methylpyrazol-1-ylmethylenepyridine (L2), 3-ferrocenylpyrazol-1-ylethylamine (L3) and 3-ferrocenyl-5-pyrazol-1-ylethylamine (L4) afford the corresponding zinc complexes [Zn(CH3COO)2(L1)] (1), [Zn(CH3COO)2(L2)] (2), [Zn(CH3COO)2(L3)] (3), and [Zn(CH3COO)2(L4)] (4). These zinc complexes behave as catalysts or initiators for the ring opening polymerization of ∈ -caprolactone, depending on the nature of the ligands, to produce polymers that are capped with α,ω-dihydroxy, hydroxyl or ferrocenylpyrazolylethylamino end groups. Complexes 1 and 2 were found to act as catalysts when the [CL]/[C] ratios were varied from 100 to 800 to produce PCL with α,ω-dihydroxy and nearly the same molecular weight. Complexes 3 and 4 on the other hand act as initiators to produce a mixture of PCL that have polymers with ferrocenylpyrazolylethylamino and a hydroxyl as end groups as the major component of the mixture and minor species with α,ω-dihydroxy end group.

AB - The reaction of Zn(OAc)2 with 3-ferrocenylpyrazol-1-ylmethylenepyridine (L1), 3-ferrocenyl-5-methylpyrazol-1-ylmethylenepyridine (L2), 3-ferrocenylpyrazol-1-ylethylamine (L3) and 3-ferrocenyl-5-pyrazol-1-ylethylamine (L4) afford the corresponding zinc complexes [Zn(CH3COO)2(L1)] (1), [Zn(CH3COO)2(L2)] (2), [Zn(CH3COO)2(L3)] (3), and [Zn(CH3COO)2(L4)] (4). These zinc complexes behave as catalysts or initiators for the ring opening polymerization of ∈ -caprolactone, depending on the nature of the ligands, to produce polymers that are capped with α,ω-dihydroxy, hydroxyl or ferrocenylpyrazolylethylamino end groups. Complexes 1 and 2 were found to act as catalysts when the [CL]/[C] ratios were varied from 100 to 800 to produce PCL with α,ω-dihydroxy and nearly the same molecular weight. Complexes 3 and 4 on the other hand act as initiators to produce a mixture of PCL that have polymers with ferrocenylpyrazolylethylamino and a hydroxyl as end groups as the major component of the mixture and minor species with α,ω-dihydroxy end group.

KW - Catalysts

KW - Ferrocenylpyrazolyl zinc(II) acetate

KW - Initiators

KW - Ring opening polymerization

KW - ∈ -Caprolactone

UR - https://www.scopus.com/pages/publications/84935891763

U2 - 10.1016/j.molcata.2015.05.021

DO - 10.1016/j.molcata.2015.05.021

M3 - Article

AN - SCOPUS:84935891763

SN - 1381-1169

VL - 406

SP - 185

EP - 193

JO - Journal of Molecular Catalysis A: Chemical

JF - Journal of Molecular Catalysis A: Chemical

ER -

(Ferrocenylpyrazolyl)zinc(II) acetate complexes as initiators and catalysts for the ring opening polymerization of ∈ -caprolacton

Abstract

Keywords

ASJC Scopus subject areas

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