Issue 16, 2021

Triskelion-shaped iridium-helicene NHC complex

Abstract

Enantiopure tris-helicenic chiral-at-iridium complexes have been prepared, constituting the first examples of organometallic metal-tris-helicenes. They have the mer- or fac-Ir(C^C:)3 form, where (C^C:) is an N-heterocyclic carbene ligand N-substituted with a hexahelicene. Their triskelion geometry and stereochemistry have been thoroughly studied and assigned by NMR in combination with quantum-chemical modelling and by comparison with the X-ray structure of analogues. Thanks to their Ir(III)-based multihelicenic architecture, the complexes display strong electronic circular dichroism and optical rotation along with long-lived yellow phosphorescence, involving circularly polarized emission with glum factors around 10−3.

Graphical abstract: Triskelion-shaped iridium-helicene NHC complex

Supplementary files

Article information

Article type
Research Article
Submitted
23 Apr 2021
Accepted
07 Jul 2021
First published
09 Jul 2021

Inorg. Chem. Front., 2021,8, 3916-3925

Triskelion-shaped iridium-helicene NHC complex

E. S. Gauthier, N. Hellou, E. Caytan, S. Del Fré, V. Dorcet, N. Vanthuyne, L. Favereau, M. Srebro-Hooper, J. A. G. Williams and J. Crassous, Inorg. Chem. Front., 2021, 8, 3916 DOI: 10.1039/D1QI00527H

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