Ruthenium(II) Complexes of Mixed Bipyridyl and Dithiolate Ligands: Synthesis, Characterization and Electrochemical Studies

We report the synthesis, characterization and electrochemical studies of four ruthenium(II) complexes of mixed bipyridyl and dithiolate ligands. The complexes formulated as [Ru(L-1)(dcbpy)], [Ru(L-2)(dcbpy)], [Ru(L-3)(dcbpy)] and [Ru(L-4)(dcbpy)] where L-1 = dipotassium ethoxycarbonyl-1-cyanoethyl ene-2,2-dithiolate, L-2 = dipotassium bis(ethoxycarbonyl)ethane-2,2-dithiolate, L-3 = dipotassium cyanodithio-imidocarbonate, L-4 = dipotassium 2,2-dicyanoethylene-2,2-dithiolate and dcbpy = 4,4-dicarboxylic-2,2-bipyridine. The ligands and complexes were characterized by FTIR, UV-Vis, PL, NMR spectroscopic techniques, cyclic and square wave voltammetry. The FT-IR spectra studies confirmed the coordination of the ligands to the Ru(II) ion. Electronic absorption indicates that the geometry around the metal ion is 4 coordinate square planar. The ruthenium(II) complexes showed good redox properties from the CV and SWV measurements. All the complexes exhibited strong photoluminescence intensity ratios in the red regions, which indicated good electrochemical abilities.