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Long-lived circularly-polarized phosphorescence in helicene-NHC-rhenium(I) complexes: The influence of helicene, halogen and stereochemistry on emission properties

Abstract : The first enantiopure chiral-at-rhenium complexes of the form fac-ReX(CO) (:C^N) have been prepared, where :C^N is a helicene-N-heterocyclic carbene (NHC) ligand and X=Cl or I. These have complexes show strong changes in the emission characteristics, notably strongly enhanced phosphorescence lifetimes (reaching 0.7 ms) and increased circularly polarized emission (CPL) activity, as compared to their parent chiral models lacking the helicene unit. The halogen along with its position within the dissymmetric stereochemical environment strongly affect the photophysics of the complexes, particularly the phosphorescence quantum yield and lifetime. These results give fresh insight into fine tuning of photophysical and chiroptical properties of Re-NHC systems.
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Etienne S Gauthier, Laura Abella, Nora Hellou, Benoît Darquié, Elsa Caytan, et al.. Long-lived circularly-polarized phosphorescence in helicene-NHC-rhenium(I) complexes: The influence of helicene, halogen and stereochemistry on emission properties. Angewandte Chemie International Edition, Wiley-VCH Verlag, 2020, 59 (22), pp.8394-8400. ⟨10.1002/anie.202002387⟩. ⟨hal-02533163⟩

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