DENISOV, Sergey A.; CUDRÉ, Yanouk; VERWILST, Peter; JONUSAUSKAS, Gediminas; MARIN-SUAREZ, Marta; FERNANDEZ-SANCHEZ, Jorge Fernando; BARANOFF, Etienne; MCCLENAGHAN, Nathan D.

doi:10.1021/ic4030712

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DENISOV, Sergey A.
Institut des Sciences Moléculaires [ISM]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

CUDRÉ, Yanouk
School of Chemistry [Birmingham]

VERWILST, Peter
Institut des Sciences Moléculaires [ISM]

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Article de revue

Ce document a été publié dans

Inorganic Chemistry. 2014-02-20, vol. 53, n° 5, p. 2677-2682

American Chemical Society

Résumé en anglais

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.< Réduire

DOI

http://dx.doi.org/10.1021/ic4030712

Projet Européen

Tris-heteroleptic cyclometalated iridium(III) complexes for white electroluminescence

Project ANR

Initiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003

Origine

Importé de hal

Unités de recherche

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798