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UID:69d3b6e09e1aa
DTSTAMP:20260406T093632
DTSTART:20110504T163000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20110504T180000
URL:https://murmitoyen.com/events/vanille/udem/detail/40446
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Conférence du Professeur Jean-François Nierengarten (Strasbourg)
DESCRIPTION:Titre : From Fullerene-Donor Conjugates to Luminescent Transiti
 on Metal Complexes.Cette conférence sera prononcée par le Professeur Je
 an-François Nierengarten du Laboratoire de chimie des matériaux molécul
 aires de l'Université de Strasbourg (France). Elle sera donnée en anglai
 s. Résumé : Coordination compounds possessing low-lying metal-to-ligan
 d charge transfer (MLCT) excited states with marked reducing character are
  excellent partners for C60 in photoactive multicomponent hybrid systems. 
 We have prepared a large number of dyads in which C60 is coupled with phot
 oactive coordination compounds of Ru(II)\, Re(I)\, Ir(III) and Cu(I). For 
 most of these systems\, the energy of the lowest 3MLCT level lies higher t
 han that of the fullerene singlet and triplet\, whereas the charge separat
 ed state is intermediate. Upon excitation of the metal- complexed moiety\,
  charge separation followed by charge recombination to the fullerene tripl
 et is generally observed. Practically\, since direct excitation of the ful
 lerene moiety results in regular deactivation without intercomponent inter
 actions\, the fullerene triplet level is the final energy sink of the dyad
 \, whatever the excitation wavelength. The situation is rather different i
 n the case of Cu(I)-bisphenanthroline fullerene hybrids. Cu(I) complexes a
 re indeed stronger reducing agents than Ru(II)\, Re(I) or Ir(III) systems\
 , thus the charge separated state is the lowest in the energy level diagra
 m\, originating a different pattern of photoinduced processes\, also finel
 y depending on the fullerene cage functionalization (e.g. mono- vs. bis-me
 thanofullerenes). During the photophysical studies carried out on these dy
 ads\, we have also systematically investigated the electronic properties o
 f the corresponding model compounds and thus became progressively involved
  in the field of phosphorescent metal complexes. In particular\, we have d
 eveloped strongly luminescent Cu(I) complexes and shown their potential fo
 r light emitting applications. Indeed\, such non-toxic Cu(I) complexes are
  interesting alternatives to the heavy metal complexes (Ir(III) and Pt(II)
  derivatives) typically used as electrophosphorescent materials in LEDs.In
 formation supplémentaire
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TZID:America/Montreal
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