Synthesis of miktoarm star copolymer Ru(II) complexes by click-to-chelate approach

Abstract

A series of AB2-, ABC-, (AB)2-, A2B2- and ABCD-type miktoarm star copolymer Ru(II) complexes were readily synthesized by stepwise chelating reactions between a Ru(II)(DMSO)4Cl2 and polymer-substituted 2-(1H-1,2,3-triazol-4-yl)pyridine or 2,6-bis(1H-1,2,3-triazol-4-yl)pyridine ligands. The polymer-substituted 2-(1H-1,2,3-triazol-4-yl)pyridine and 2,6-bis(1H-1,2,3-triazol-4-yl)pyridine ligands were conveniently prepared by the click reaction of ethynylpyridines with well-defined azido-terminated polymers, which were prepared by a combination of living/controlled polymerization procedures and end-substitution reactions.