Electrochemical and Spectroscopic Behaviors of a Novel Ruthenium(II) Complex with a Six-Membered Chelate Structure.

A novel polypyridyl ruthenium(II) complex with a six-membered chelate ring ([Ru(dmb)2(8pyq)]2+) was designed and synthesized. The oxidation potential was shifted to the negative potential direction, and relatively intense metal-to-ligand charge transfer absorption in the longer-wavelength region was observed for [Ru(dmb)2(8pyq)]2+ compared with the reference complexes without any six-membered chelate rings. The electrochemical and spectroscopic properties of [Ru(dmb)2(8pyq)]2+ were discussed in terms of the chelate structure and coordination geometry with utilization of theoretical calculations.