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.
Fichier principal
Gauthier et al-2020-Long‐Lived Circularly Polarized Phosphorescence in Helicene‐NHC Rhenium(I) Complexes.pdf (988 Ko)
Télécharger le fichier
Origin : Files produced by the author(s)
Loading...