Direct observation of reversible electronic energy transfer involving an iridium center

Sergey A Denisov, Yanouk Cudré, Peter Verwilst, Gediminas Jonusauskas, Marta Marín-Suárez, Jorge Fernando Fernández-Sánchez, Etienne Baranoff, Nathan D McClenaghan

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39 Citations (Scopus)
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Abstract

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.
Original languageEnglish
Pages (from-to)2677-2682
Number of pages6
JournalInorganic Chemistry
Volume53
Issue number5
Early online date20 Feb 2014
DOIs
Publication statusPublished - 3 Mar 2014

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