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The use of Cu and Zn salicylaldimine complexes as catalyst precursors in ring opening polymerization of lactides: ligand effects on polymer characteristics

Bhunora, Suraj; Mugo, Jane; Bhaw-Luximon, Archana; Mapolie, Selwyn; Van Wyk, Juanita; Darkwa, James and Nordlander, Ebbe LU (2011) In Applied Organometallic Chemistry 25(2). p.133-145
Abstract
A range of monomeric tetra-coordinate copper (II) and zinc (II) complexes based on N,O-bidentate salicylaldimine Schiff base ligands has been synthesized and characterized using various spectroscopic techniques. These complexes were then evaluated as initiators in ring-opening polymerization of lactides at both 70 degrees C and 110 degrees C. The effect of structural changes in the complexes on the ability of these compounds to initiate lactide polymerization as well as the impact on the chemical and physical characteristics of the polymers obtained indicate that the coordination geometry of the metal complex, M-O bond length and substituents on the Schiff base ligand all play a role in the catalyst activity. Electronic factors were... (More)
A range of monomeric tetra-coordinate copper (II) and zinc (II) complexes based on N,O-bidentate salicylaldimine Schiff base ligands has been synthesized and characterized using various spectroscopic techniques. These complexes were then evaluated as initiators in ring-opening polymerization of lactides at both 70 degrees C and 110 degrees C. The effect of structural changes in the complexes on the ability of these compounds to initiate lactide polymerization as well as the impact on the chemical and physical characteristics of the polymers obtained indicate that the coordination geometry of the metal complex, M-O bond length and substituents on the Schiff base ligand all play a role in the catalyst activity. Electronic factors were dominant in the case of the copper complexes while steric factors prevailed in the case of Zn initiators. Both the Zn and Cu complexes exhibit characteristics of living ring opening polymerization. Copyright (C) 2010 John Wiley & Sons, Ltd. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
salicylaldimine complexes, copper Schiff base complexes, zinc Schiff, base complexes, lactide polymerization, ring-opening polymerization
in
Applied Organometallic Chemistry
volume
25
issue
2
pages
133 - 145
publisher
John Wiley & Sons
external identifiers
  • wos:000285932000009
  • scopus:78651103905
ISSN
1099-0739
DOI
10.1002/aoc.1728
language
English
LU publication?
yes
id
17a9ba50-35fe-4fe1-8da0-1699581de4aa (old id 1791049)
date added to LUP
2011-03-10 16:15:53
date last changed
2017-10-22 03:10:51
@article{17a9ba50-35fe-4fe1-8da0-1699581de4aa,
  abstract     = {A range of monomeric tetra-coordinate copper (II) and zinc (II) complexes based on N,O-bidentate salicylaldimine Schiff base ligands has been synthesized and characterized using various spectroscopic techniques. These complexes were then evaluated as initiators in ring-opening polymerization of lactides at both 70 degrees C and 110 degrees C. The effect of structural changes in the complexes on the ability of these compounds to initiate lactide polymerization as well as the impact on the chemical and physical characteristics of the polymers obtained indicate that the coordination geometry of the metal complex, M-O bond length and substituents on the Schiff base ligand all play a role in the catalyst activity. Electronic factors were dominant in the case of the copper complexes while steric factors prevailed in the case of Zn initiators. Both the Zn and Cu complexes exhibit characteristics of living ring opening polymerization. Copyright (C) 2010 John Wiley & Sons, Ltd.},
  author       = {Bhunora, Suraj and Mugo, Jane and Bhaw-Luximon, Archana and Mapolie, Selwyn and Van Wyk, Juanita and Darkwa, James and Nordlander, Ebbe},
  issn         = {1099-0739},
  keyword      = {salicylaldimine complexes,copper Schiff base complexes,zinc Schiff,base complexes,lactide polymerization,ring-opening polymerization},
  language     = {eng},
  number       = {2},
  pages        = {133--145},
  publisher    = {John Wiley & Sons},
  series       = {Applied Organometallic Chemistry},
  title        = {The use of Cu and Zn salicylaldimine complexes as catalyst precursors in ring opening polymerization of lactides: ligand effects on polymer characteristics},
  url          = {http://dx.doi.org/10.1002/aoc.1728},
  volume       = {25},
  year         = {2011},
}