Abstract
The absorption, luminescence, and luminescence excitation spectra of ruthenium(II) complexes cis-[Ru(bpy)2(L)Cl]+[bpy=2,2′-bipyridyl; L=NH3, pyrazine, pyridine, 4-aminopyridine, 4-picoline, isonicotinamide, 4-cyanopyridine, 4,4′-bipyridyl, or trans-1,2-bis(4-pyridyl)ethylene] in alcoholic (4: 1 EtOH-MeOH) solutions are studied. At 77 K, the quantum yields and decay times of the luminescence of the complexes are measured and the deactivation rate constants of the lowest electronically excited metal-to-ligand charge transfer state (3MLCT) are determined. The linear correlation between the energy of the lowest state 3MLCT d π(Ru)>π*(bpy) of the cis-[Ru(bpy)2(L)Cl]+ complexes and the parameter pKa of the free 4-substituted pyridines and pyrazine used as ligands is established.
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