Synthesis and X-ray Structures of Potential Light-Harvesting Ruthenium(II) Complexes

We synthesized the luminescent ruthenium(II) polypyridyl complexes of type [Ru(bpy)2(L1)][ClO4]2 (1) (where L1 = 4,4-dicarboxy-2,2-bipyridine); [Ru(bpy)2(L2)][ClO4]2 (2); and [Ru(L2)3][ClO4]2 (3) L2 4,4-dimethanol-2,2-bipyridine). Photo-physical electrochemical properties Ru(II) were investigated along with emission vs. pH. This reveals that carboxylic acids in 2,2-bipyridine ligand had a more important influence on photophysical than alcohol. The crystal structure 1–3 is also discussed this paper. cyclic voltammetry yields reversible RuIII/II wave shifts 1.4–1.2 V. UV/Visible absorbance spectroscopy Metal-to-Ligand Charge Transfer (MLCT) transitions shift to lower energy upon deprotonation complex.