Long-lived circularly-polarized phosphorescence in helicene-NHC-rhenium(I) complexes: The influence of helicene, halogen and stereochemistry on emission properties - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Angewandte Chemie International Edition Année : 2020

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

Laura Abella
J a Gareth Williams
  • Fonction : Auteur correspondant
Jochen Autschbach
  • Fonction : Auteur correspondant

Résumé

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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Dates et versions

hal-02533163 , version 1 (12-05-2020)

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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, 2020, 59 (22), pp.8394-8400. ⟨10.1002/anie.202002387⟩. ⟨hal-02533163⟩
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