Long-lived circularly-polarized phosphorescence in helicene-NHC-rhenium(I) complexes: The influence of helicene, halogen and stereochemistry on emission properties - Archive ouverte HAL Access content directly
Journal Articles Angewandte Chemie International Edition Year : 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
  • Function : Correspondent author
Jochen Autschbach
  • Function : Correspondent author

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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Dates and 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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