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2007-06-25 - Article/Dans un journal avec peer-review - Anglais - 8 page(s)

Fron E., Schweitzer G., Jacob J., Van Vooren Antoine , Beljonne David , Müllen K., Hofkens J., Van Der Auweraer M., De Schryver F.C., "Singlet-Singlet Annihilation Leading to a Charge-Transfer Intermediate in Chromophore-End-Capped Pentaphenylenes" in Chemphyschem : A European Journal of Chemical Physics and Physical Chemistry, 8, 9, 1386-1393

  • Edition : Wiley-VCH Verlag Gmbh, Weinheim (Germany)
  • Codes CREF : Spectroscopie [électromagnétisme, optique, acoustique] (DI1255)
  • Unités de recherche UMONS : Chimie des matériaux nouveaux (S817)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
Texte intégral :

Abstract(s) :

(Anglais) The excited-state properties of two peryleneimide chromophore end-capped pentaphenylene compounds were investigated in detail using femtosecond transient absorption and single-photon timing experiments. Singlet–singlet annihilation was found to promote one chromophore into a higher excited state and results in the formation of an ultra-short-living intermediate charge-transfer (CT) state in the Sn–S1 deactivation pathway. In low-polarity solvents, this CT state is found to be energetically higher than the first excited state and thus cannot be populated via one-photon excitation. The observed CT state decays with a time constant of about 1 ps to form the lowest singlet excited state. These results demonstrate the potential use of the singlet–singlet annihilation as a novel tool in studying reactions occurring in states that are energetically above the S1.

Identifiants :
  • DOI : 10.1002/cphc.200700136