Design of a hydrophilic ruthenium catalyst for metal-catalyzed living radical polymerization: highly active catalysis in water

作者：Nishizawa Keita; Ouchi Makoto^*; Sawamoto Mitsuo^*

来源：RSC Advances, 2016, 6(8): 6577-6582.

DOI：10.1039/c5ra22634a

A novel hydrophilic phosphine ligand for a ruthenium catalyst was synthesized towards useful living radical polymerization in water. Triethylene glycol (TEG) was introduced at the para position of triphenylphosphine and the resultant TEG-decorated ligand was combined with a Cp*-based ruthenium precursor ([Cp*Ru(mu(3)-Cl)](4)) to prepare a hydrophilic ruthenium complex. The obtained ruthenium complex induced homogeneous controlled polymerization of poly(ethylene glycol) methacrylate (PEGMA) in water: the monomer conversion reached over 90% in 20 min, and the obtained polymers showed narrow MWD (M-w/M-n < 1.16). The ruthenium catalyst was active enough to allow a decrease in catalyst amount ([Ru](0)/[initiator](0) = 1/100) or polymerization at low temperature, 0 degrees C [ for 2-hydroxyethyl methacrylate (HEMA)]. The catalyst also induced aqueous block copolymerization for the combination of water-soluble monomers: PEGMA/HEMA and PEGMA/2-(dimethylamino)ethyl methacrylate (MeDMA).

• 出版日期2016