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Enlightening the mechanism of copper mediated photoRDRP via high-resolution mass spectrometry
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Frick, Elena, Anastasaki, Athina, Haddleton, David M. and Barner-Kowollik, Christopher (2015) Enlightening the mechanism of copper mediated photoRDRP via high-resolution mass spectrometry. Journal of the American Chemical Society, 137 (21). pp. 6889-6896. doi:10.1021/jacs.5b03048
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Official URL: http://dx.doi.org/10.1021/jacs.5b03048
Abstract
The initiation mechanism of photochemically mediated Cu-based reversible-deactivation radical polymerization (photoRDRP) was investigated using pulsed-laser polymerization (PLP) and high-resolution mass spectrometry. The variation of the catalyst composition and ESI-MS analysis of the resulting products provided information on how initiator, ligand, copper species, and monomer are interacting upon irradiation with UV light. A discussion of the results allows for a new postulation of the mechanism of photoRDRP and–for the first time–the unambiguous identification of the initiating species and their interactions within the reaction mixture. One pathway for radical generation proceeds via UV light-induced C–Br bond scission of the initiator, giving rise to propagating radicals. The generation of copper(I) species from copper(II) can occur via several pathways, including, among others, via reduction by free amine ligand in its excited as well as from its ground state via the irradiation with UV light. The amine ligand serves as a strong reducing agent and is likely the main participant in the generation of copper(I) species.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science > Chemistry | ||||||
| Journal or Publication Title: | Journal of the American Chemical Society | ||||||
| Publisher: | American Chemical Society | ||||||
| ISSN: | 0002-7863 | ||||||
| Official Date: | 13 May 2015 | ||||||
| Dates: |
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| Volume: | 137 | ||||||
| Number: | 21 | ||||||
| Page Range: | pp. 6889-6896 | ||||||
| DOI: | 10.1021/jacs.5b03048 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access |
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