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Enantiopure Cycloiridiated Complexes Bearing a Pentahelicenic N-Heterocyclic Carbene and Displaying Long-Lived Circularly Polarized Phosphorescence

Abstract : A fused p-helical N-heterocyclic carbene (NHC) system was prepared and examined through its diastereoiso-merically pure cycloiridiated complexes. The latter display light-green phosphorescence with unusually long lifetimes and circular polarization that depends on both the helical NHC P/M stereochemistry and the iridium D/L stereochemistry. These unprecedented features are attributed to extended p conjugation within the helical carbenic ligand and efficient helicene-NHC–Ir interaction.
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Nora Hellou, Monika Srebro-Hooper, Ludovic Favereau, Francesco Zinna, Elsa Caytan, et al.. Enantiopure Cycloiridiated Complexes Bearing a Pentahelicenic N-Heterocyclic Carbene and Displaying Long-Lived Circularly Polarized Phosphorescence. Angewandte Chemie International Edition, Wiley-VCH Verlag, 2017, 56 (28), pp.8236-8239. ⟨10.1002/anie.201704263⟩. ⟨hal-01539192⟩

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