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Title
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The nature of Cu(II) species in ATRP: new insights via EPR
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Author
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Abstract
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| 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. |
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Language
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English
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Source (journal)
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Journal of polymer science: A: polymer chemistry. - New York, N.Y., 1986, currens
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Publication
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New York, N.Y.
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2010
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ISSN
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0887-624X
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Volume/pages
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48
:7
(2010)
, p. 1493-1501
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ISI
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000275848000005
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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