Title
The nature of Cu(II) species in ATRP: new insights via EPR The nature of Cu(II) species in ATRP: new insights via EPR
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York, N.Y. ,
Subject
Physics
Source (journal)
Journal of polymer science: A: polymer chemistry. - New York, N.Y., 1986, currens
Volume/pages
48(2010) :7 , p. 1493-1501
ISSN
0887-624X
ISI
000275848000005
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Identification of the paramagnetic species present in the Cu(I)Br-catalyzed atom transfer radical polymerization (ATRP) of a model monomer (isobornyl acrylate) has been carried out by electron paramagnetic resonance (EPR) in the continuous wave mode at 90 K. Up to five different species - four copper-based species and one organic radical - were detected with this technique. The EPR parameters of the copper-based species are found to differ strongly, and originate from diverse isolated Cu(II) complexes, as well as dipolarly interacting and even exchange-coupled Cu(II) species. The work highlights the complexity of the copper-based EPR signal observed in copper-mediated ATRP reactions. Analysis of the time evolution of the individual EPR contributions reveals the disadvantages of quantitative kinetics studies based on the summed EPR intensity of all copper-based species, as is commonly used in literature for this type of reactions.
E-info
https://repository.uantwerpen.be/docman/iruaauth/310011/532aa85c7b6.pdf
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