Article (Scientific journals)
Key role of intramolecular metal chelation and hydrogen bonding in the cobalt-mediated radical polymerization of N-vinyl amides
Debuigne, Antoine; Morin, Aurélie; Kermagoret, Anthony et al.
2012In Chemistry, 18, p. 12834-12844
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Keywords :
radical polymerization; cobalt-mediated radical polymerization (CMRP)
Abstract :
[en] This work reveals the preponderance of an intramolecular metal chelation phenomenon in a controlled radical polymerization system involving the reversible trapping of the radical chains by a cobalt complex, i.e. the bis(acetylacetonato)cobalt(II). The cobalt-mediated radical polymerization (CMRP) of a series of N-vinyl amides was considered in order to evidence the effect of the cobalt chelation by the amide moiety of the last monomer unit of the chain. The latter reinforces the cobalt-polymer bond in the order N-vinylpyrrolidone < N-vinyl caprolactam < N-methyl-N-vinyl acetamide, and is responsible for the optimal control of the polymerizations observed for the last two monomers. Such a double linkage between the controlling agent and the polymer, via a covalent bond and a dative one, is unique in the field of controlled radical polymerization and represents a powerful opportunity to fine tune the equilibrium between latent and free radicals. The possible hydrogen bond formation is also taken into account in the case of N-vinyl acetamide and N-vinyl formamide. These results are essential for understanding factors influencing a Co-C bond strength in general, and the CMRP mechanism in particular, but also for developing a powerful platform for the synthesis of new precision poly(N-vinyl amide)s, an important class of polymers which sustains numerous applications today.
Research Center/Unit :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Materials science & engineering
Chemistry
Author, co-author :
Debuigne, Antoine  ;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Morin, Aurélie;  University of Toulouse, France > Laboratoire de Chimie de Coordination (LCC)
Kermagoret, Anthony ;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Piette, Yasmine;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Detrembleur, Christophe ;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Jérôme, Christine  ;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Poli, Rinaldo;  University of Toulouse and Institut Universitaire de France > Laboratoire de Chimie de Coordination (LCC)
Language :
English
Title :
Key role of intramolecular metal chelation and hydrogen bonding in the cobalt-mediated radical polymerization of N-vinyl amides
Publication date :
2012
Journal title :
Chemistry
ISSN :
0947-6539
eISSN :
1521-3765
Publisher :
Wiley
Volume :
18
Pages :
12834-12844
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
CNRS - Centre National de la Recherche Scientifique
IUF - Institut Universitaire de France
ANR - Agence Nationale de la Recherche
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