SPECIFIC SOLVENT EFFECTS OF LINEAR ALCOHOLS ON THE EMISSION-SPECTRUM AND THE EXCITED-STATE DECAY OF TRIS(2,2'-BIPYRIDYL) RUTHENIUM(II)

This study aims at a quantitative extraction of specific solvent effec ts of hydroxylic solvents on the non-radiative decay of tris(2,2'-bipy ridyl) ruthenium(II). For this purpose the emission spectra, quantum y ields and excited state lifetimes of the dye were measured in a series of monovalent linear alcohols. Separation of the non-radiative decay via the energy gap was achieved by evaluating the temperature dependen ce of quantum yields to account for temperature-activated transitions. The parameters determining the shapes of the emission spectra were ca lculated by a modified Franck-Condon analysis including the anharmonic Morse potential, and correlated with the non-radiative rate with the help of the energy gap law. The specific effects of hydroxylic solvent s were finally obtained by comparison with the well-known behavior in non-hydroxylic solvents, and interpreted with the help of the energy g ap law theory.