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Controlled radical polymerization catalysed by ruthenium complexes: Variations on Ru-Cp#
Delfosse, Sébastien; Richel, Aurore; Simal, Francois et al.
2003In Matyjaszewski, K. (Ed.) Advances in Controlled/Living Radical Polymerization / ACS Symposium Series 854
 

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Abstract :
[en] A series of isoelectronic ruthenium-based complexes of the general formula [RuX(Cp#)L2] (Cp# = cyclopentadienyl or cyclopentadienyl derivatives) were synthesized, and their relative catalytic activities were determined by monitoring the atom transfer radical polymerization of methyl methacrylate, n-butyl acrylate, and styrene. [RuCl(Cp*)(PPh3)2] and [RuCl(Ind)(PPh3)2] were found to be highly efficient catalysts for ATRP, producing polymers with narrow molecular weight distribution (Mw/Mn < 1.2). the following order of increasing efficiency was determined: [RuCl(Cp)(PPh3)2] << [RuCl(ind)(PPh3)2] < [RuCl(Cp*)(PPh3)2]. In sharp contrast, ruthena-carboranes were inefficient for ATRP, demonstrating therefore the prominent role of the Cp# ligand. The effect of the phosphine ligands was also investigated, and additional studies indicated that the release of a phosphine ligand occured prior to the activation of the carbon-halogen bond of both the initiator and polymer growing chain end by the unsaturated ruthenium center.
Disciplines :
Chemistry
Author, co-author :
Delfosse, Sébastien
Richel, Aurore  ;  Université de Liège - ULiège > Chimie et bio-industries > Chimie biologique industrielle
Simal, Francois
Demonceau, Albert ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie macromoléculaire et catalyse organique
Noels, Alfred ;  Université de Liège - ULiège > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences)
Tutusaus, Oscar
Nuñez, Rosario
Viñas, Clara
Teixidor, Francesc
Language :
English
Title :
Controlled radical polymerization catalysed by ruthenium complexes: Variations on Ru-Cp#
Publication date :
2003
Main work title :
Advances in Controlled/Living Radical Polymerization / ACS Symposium Series 854
Author, co-author :
Matyjaszewski, K.
Publisher :
Amer. Chem. Soc.
Collection name :
ACS Symposium Series
Pages :
116-129
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