de la recherche sur la nature et les technologies) and the
Universite de Sherbrooke for financial support. PDH
acknowledges NSERC for financial support. The project was
underwritten by the CQMF (Centre Quebecois sur les Materiaux
´ ´ ´
Fonctionnels).
Notes and references
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Fig. 2 Isodensity surface plots obtained by DFT for selected orbitals of
3 and 4. A quantum mechanical THF solvation model was employed.16
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´
described once previously in a neutral heterobimetallic IrIII and
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isoenergetic HOMO–LUMO and HOMO ꢁ 1 - LUMO
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tion band observed at 460 nm, attributed to a HOMO ꢁ 2 -
LUMO transition (l = 453 nm), is predicted to originate
primarily from a dPtp*bpy state. By contrast, the emission,
computed at 554 nm, is localized exclusively on the [Ir] moiety
and is 3MLCT/LLCT in nature, which may account for the larger
observed quantum efficiency. The long-lived te results from the
contribution of the Pt-centred excited state.
8 (a) J. H. Van Diemen, R. Hage, J. G. Haasnoot, H. E. B. Lempers,
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´ ´
Hence, the synthesis of the first cationic heterobimetallic
hybrid complexes bearing IrIII and PtII units is herein reported.
Compound 3 emits from a mixed p*bpydPt and p*bpyptol state
while 4 emits from a mixed 3MLCT/LLCT state localized on Ir.
The incorporation of a [Pt] moiety creates hybrid excited states
and a blue-shift of the emission band compared to 1 is observed.
Emission te’s were significantly longer for the hybrids while FPL
and molar absorptivities for 4 were noticeably enhanced.
D. Fortin and P. D. Harvey, Organometallics, 2008, 27,
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EZ-C acknowledges CFI (Canadian Foundation for
Innovation), NSERC (the National Sciences and Engineering
Research Council of Canada), FQRNT (Le Fonds quebecois
c
1122 Chem. Commun., 2012, 48, 1120–1122
This journal is The Royal Society of Chemistry 2012