Light-Driven Living/Controlled Radical Polymerization of Hydrophobic Monomers Catalyzed by Ruthenium(II) Metalacycles
Por:
Alfredo N.V., Jalapa N.E., Morales S.L., Ryabov A.D., Le Lagadec R., Alexandrova L.
Publicada:
23 oct 2012
Resumen:
A versatile photoactivated catalytic system based on a cyclometalated ruthenium(II) complex, composed of strongly coordinating bidentate and relatively labile ligands, in conjunction with a traditional alkyl bromide initiator, has been developed for living/controlled radical polymerization. Polymerizations of three typical hydrophobic monomers-methyl methacrylate (MMA), styrene (St), and n-butyl acrylate (BA)-proceeded to high conversions under visible light irradiation. The polymerization process was photoresponsive, i.e, took place only under irradiation and immediately stopped when the light was turned off Block copolymers of MMA with St and BA with St, as well as statistical copolymer of BA and St, could also be conveniently prepared. H-1 NMR and electrochemical studies suggest a mechanism of the catalytic activation, which involves a photoinduced formation of the solvento 18-electron species cis-[Ru(o-C6H4-2-py)(phen)(MeCN)(acetone)](+) through the intermediacy of the 16-electron
Filiaciones:
Alfredo N.V.:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Jalapa N.E.:
Univ Nacl Autonoma Mexico, Inst Quim, Mexico City 04510, DF, Mexico
Morales S.L.:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Ryabov A.D.:
Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, United States
Le Lagadec R.:
Univ Nacl Autonoma Mexico, Inst Quim, Mexico City 04510, DF, Mexico
Alexandrova L.:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
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