Enantiopure Cycloiridiated Complexes Bearing a Pentahelicenic N-Heterocyclic Carbene and Displaying Long-Lived Circularly Polarized Phosphorescence.
Nora HellouMonika Srebro-HooperLudovic FavereauFrancesco ZinnaElsa CaytanLoïc ToupetVincent DorcetMarion JeanNicolas VanthuyneJ A Gareth WilliamsLorenzo Di BariJochen AutschbachJeanne CrassousPublished in: Angewandte Chemie (International ed. in English) (2017)
A fused π-helical N-heterocyclic carbene (NHC) system was prepared and examined through its diastereoisomerically 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 Δ/Λ stereochemistry. These unprecedented features are attributed to extended π conjugation within the helical carbenic ligand and efficient helicene-NHC-Ir interaction.
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