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- W1999014125 abstract "The photophysical properties of Ru(bpy)[sub 3][sup 2+], Ru(bpz)[sub 3][sup 2+], and Ru(bpz)[sub 2](bpm)[sup 2+] (bpy = 2,2[prime]-bipyridine, bpz = 2,2[prime]-bipyrazine, bpm = 2,2[prime]-bipyrimidine) have been studied in neat and mixed CH[sub 3]CN-H[sub 2]O solutions. The temperature dependent lifetimes, room-temperature emission spectra, and quantum yields were determined for the complexes; the rate constants and activation parameters for the various photophysical pathways were calculated from the data. Shifts of the emission energy (E[sub cm]) as a function of solvent composition suggest that the excited states are preferentially solvated by water molecules. Although radiative decay is relatively insensitive to the change of solution medium, nonradiative decay (k[sub nr]) and the temperature-dependent thermal population of the metal centered d-d state, which account for more than 90% of the decay of the emitting MLCT state, are strongly dependent on solvent and temperature; the observed phenomena can be well understood on the basis that the energy level of the MLCT state, which possesses a static dipole moment, is sensitive to the polarity change of the solution medium. At lower temperatures, nonradiative decay is the dominant process, and the overall deactivation of the emitting state is faster in water-rich than in acetonitrile-rich solutions. 17 refs., 3 figs.,more » 1 tab.« less" @default.
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- W1999014125 date "1993-11-01" @default.
- W1999014125 modified "2023-10-18" @default.
- W1999014125 title "Photophysics of ruthenium(II)-diimine complexes in water-acetonitrile mixed solvents" @default.
- W1999014125 doi "https://doi.org/10.1021/j100148a018" @default.
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