J. Macromol. Sci., Pure Appl. Chem., A37, 1507-1529 (2000)

Redox active, multi-chromophore Ru(II) polypyridyl-carbazole copolymers: synthesis and characterization

Abdiaziz A. Farah, Jonathan G. C. Veinot, Morey Najman and William J. Pietro*

Department of Chemistry, York University, 4700 Keele St., Toronto, Ontario, Canada M3J 1P3

A novel diimine ligand, 2-(2-pyridyl)-4-carboxyquinoline (pcq) and its corresponding polypyridyl Ru(II) complex were synthesized, caracterized, and covalently attached to a carbazole based copolymer via post polymer modification. The resulting modified electroactive and multi-chromophoric polymer was readily characterized by UV-visible, FT-IR, differental scanning calolrimetry (DSC), thermogravimetric analysis (TGA), and elemental and electrochemical analyses. Results from cyclic voltammetry and FT-IR analysis both confirm the covalent attachment of redox active Ru(II) center into the polymer. The emission spectrum of the copolymer, in comparison to that of Ru(II) complex, is maintained, incontrast to the electronic absorption stpectrum, which is senstive to the hydrophobic polymeric chain surrounding the redox sites. The thermal analysis suggest that this metallopolymer also possesses high thermal stability. The ruthenium content was also found to be 7%, which corresponds to 80% of the maximum loading by elemental analysis.