Ligand-metal interactions and excited state properties in ruthenium(II)-diimine complexes

Abstract

2,2′-Bipyridine (bpy); 2,2′-bipyrazine (bpz); 5,6-dimethyl-2,3-di-(2′-pyridyl)-quinoxaline (dbpq); 4,4′- dimethyl-2,2′-bipyridine (dmbpy), 2,3-di-(2′- pyridyl)-pyrazine (dpp); 3,3′-bipyridazine (bpd); 2,3-di-(2′- pyridyl)-quinoxaline (dpq) and 2-(2′-pyridyl)-quinoline (pyq) form mixed-ligand complexes with Ru(II). The excited state properties (emission, lifetimes and redox potentials) are reported and analyzed in the framework of solar energy conversion. Ligand σ- and π-bonding properties are also deduced.