Direct Observation of Reversible Electronic Energy Transfer Involving an Iridium Center - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Inorganic Chemistry Année : 2014

Direct Observation of Reversible Electronic Energy Transfer Involving an Iridium Center

Résumé

A cyclometalated iridium complex is reported where the core complex comprises naphthylpyridine as the main ligand and the ancillary 2,2'-bipyridine ligand is attached to a pyrene unit by a short alkyl bridge. To obtain the complex with satisfactory purity, it was necessary to modify the standard synthesis (direct reaction of the ancillary ligand with the chloro-bridged iridium dimer) to a method harnessing an intermediate tetramethylheptanolate-based complex, which was subjected to acid-promoted removal of the ancillary ligand and subsequent complexation. The photophysical behavior of the bichromophoric complex and a model complex without the pendant pyrene were studied using steady-state and time-resolved spectroscopies. Reversible electronic energy transfer (REET) is demonstrated, uniquely with an emissive cyclometalated iridium center and an adjacent organic chromophore. After excited-state equilibration is established (5 ns) as a result of REET, extremely long luminescence lifetimes of up to 225 µs result, compared to 8.3 µs for the model complex, without diminishing the emission quantum yield. As a result, remarkably high oxygen sensitivity is observed in both solution and polymeric matrices.
Fichier principal
Vignette du fichier
DenisovIC2014_Postprint.pdf (1.16 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-00968636 , version 1 (21-02-2018)

Licence

Paternité - Partage selon les Conditions Initiales

Identifiants

Citer

Sergey A. Denisov, Yanouk Cudré, Peter Verwilst, Gediminas Jonusauskas, Marta Marin-Suarez, et al.. Direct Observation of Reversible Electronic Energy Transfer Involving an Iridium Center. Inorganic Chemistry, 2014, 53 (5), pp.2677-2682. ⟨10.1021/ic4030712⟩. ⟨hal-00968636⟩
252 Consultations
156 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More