Polychromatic femtosecond fluorescence studies of metal–polypyridine complexes in solution

Fabrizio Messina, Andrea Cannizzo, Fabrizio Messina, Olivier Bräm, Ahmed M. El-Zohry, Majed Chergui

Risultato della ricerca: Article

56 Citazioni (Scopus)

Abstract

Femtosecond-resolved broadband fluorescence studies are reported for[M(bpy)3]2+ (M = Fe, Ru), RuN3 and RuN719 complexes in solution. We investigated the pump wavelength dependence of the fluorescence of aqueous [Fe(bpy)3]2+ and the solvent and ligand dependence of the fluorescence of Ru-complexes excited at 400 nm. For all complexes, the 1MLCT fluorescence appears at zero time delay with a mirror-like image with respect to the absorption. It decays in 630–45 fs due to intersystem crossing to the 3MLCT states, but a longer lived component of 190 fs additionally shows up in RuN719 and RuN3. No solvent effects are detected. The very early dynamics are characterized by internal conversion (IC) and intramolecular vibrational redistribution (IVR) processes on a time scale which we estimate to 610 fs using the 1MLCT lifetime as an internal clock.
Lingua originaleEnglish
pagine (da-a)51-57
Numero di pagine7
RivistaChemical Physics
Volume393
Stato di pubblicazionePublished - 2011

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Metals
Fluorescence
fluorescence
metals
internal conversion
clocks
Clocks
Time delay
time lag
Pumps
pumps
Ligands
broadband
life (durability)
Wavelength
ligands
decay
estimates
wavelengths

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cita questo

Messina, F., Cannizzo, A., Messina, F., Bräm, O., El-Zohry, A. M., & Chergui, M. (2011). Polychromatic femtosecond fluorescence studies of metal–polypyridine complexes in solution. Chemical Physics, 393, 51-57.

Polychromatic femtosecond fluorescence studies of metal–polypyridine complexes in solution. / Messina, Fabrizio; Cannizzo, Andrea; Messina, Fabrizio; Bräm, Olivier; El-Zohry, Ahmed M.; Chergui, Majed.

In: Chemical Physics, Vol. 393, 2011, pag. 51-57.

Risultato della ricerca: Article

Messina, F, Cannizzo, A, Messina, F, Bräm, O, El-Zohry, AM & Chergui, M 2011, 'Polychromatic femtosecond fluorescence studies of metal–polypyridine complexes in solution', Chemical Physics, vol. 393, pagg. 51-57.
Messina, Fabrizio ; Cannizzo, Andrea ; Messina, Fabrizio ; Bräm, Olivier ; El-Zohry, Ahmed M. ; Chergui, Majed. / Polychromatic femtosecond fluorescence studies of metal–polypyridine complexes in solution. In: Chemical Physics. 2011 ; Vol. 393. pagg. 51-57.
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AU - Chergui, Majed

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AB - Femtosecond-resolved broadband fluorescence studies are reported for[M(bpy)3]2+ (M = Fe, Ru), RuN3 and RuN719 complexes in solution. We investigated the pump wavelength dependence of the fluorescence of aqueous [Fe(bpy)3]2+ and the solvent and ligand dependence of the fluorescence of Ru-complexes excited at 400 nm. For all complexes, the 1MLCT fluorescence appears at zero time delay with a mirror-like image with respect to the absorption. It decays in 630–45 fs due to intersystem crossing to the 3MLCT states, but a longer lived component of 190 fs additionally shows up in RuN719 and RuN3. No solvent effects are detected. The very early dynamics are characterized by internal conversion (IC) and intramolecular vibrational redistribution (IVR) processes on a time scale which we estimate to 610 fs using the 1MLCT lifetime as an internal clock.

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