Helicenic N-heterocyclic carbene copper(I) complex displaying circularly polarized blue fluorescence

Dalton Trans. 2022 Oct 18;51(40):15571-15578. doi: 10.1039/d2dt01925f.

Abstract

Enantiopure copper(I) chloride complexes bearing a monodentate N-(carbo[6]helicenyl)-NHC ligand have been prepared and characterized experimentally and computationally. Their high stability enables the stereochemistry to be probed by X-ray crystallography and NMR spectroscopy. The resolved enantiomeric complexes emit circularly polarized blue fluorescence with glum ∼1.3 × 10-3 in solution. The photophysical and chiroptical properties of these systems, with their helicene-centred origin, are similar to those of the organic helicene-benzimidazole precursor proligand, although the reverse axial chirality configuration is preferentially observed for the complex compared to the ligand.

MeSH terms

  • Benzimidazoles
  • Copper* / chemistry
  • Ligands
  • Methane* / analogs & derivatives
  • Methane* / chemistry

Substances

  • Benzimidazoles
  • Ligands
  • carbene
  • Copper
  • Methane