A new class of ruthenium complexes containing Schiff base ligands as promising catalysts for atom transfer radical polymerization and ring opening metathesis polymerization |
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Authors: | Bob De Clercq Francis Verpoort |
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Affiliation: | Department of Inorganic and Physical Chemistry, Ghent University, Krijgslaan 281 (S-3), 9000, Gent, Belgium |
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Abstract: | A novel series of Schiff base ruthenium complexes that are active catalysts in the field of atom transfer radical polymerization (ATRP), have been prepared. Moreover, when activated with trimethylsilyldiazomethane (TMSD), these species exhibit good catalytic activity in the ring opening metathesis polymerization (ROMP) of norbornene and cyclooctene. The activity for both the ROMP and ATRP reaction is dependent on the steric bulk and electron donating ability of the Schiff base ligand. The control over polymerization in ATRP was verified for the two substrates that exhibit the highest activity, namely MMA and styrene. The results show that the optimal ATRP equilibrium leading to a controlled polymerization, can be established by adjusting the steric and electronic properties of the Schiff base ligand. |
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Keywords: | Ring opening metathesis polymerization Atom transfer radical polymerization Ruthenium alkylidene Schiff bases Homogeneous catalysis |
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