Triskelion-shaped iridium-helicene NHC complex

Crassous, Jeanne; Gauthier, Etienne S.; Hellou, Nora; Caytan, Elsa; Fré, Samuel Del; Vanthuyne, Nicolas; Dorcet, Vincent; Williams, Gareth; Favereau, Ludovic; Srebro-Hooper, Monika

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.

Citation

Crassous, J., Gauthier, E. S., Hellou, N., Caytan, E., Fré, S. D., Vanthuyne, N., Dorcet, V., Williams, G., Favereau, L., & Srebro-Hooper, M. (2021). Triskelion-shaped iridium-helicene NHC complex. Inorganic Chemistry Frontiers, 8(16), 3916-3925. https://doi.org/10.1039/d1qi00527h

• Journal Article Type: Article
• Acceptance Date: Jul 7, 2021
• Online Publication Date: Jul 9, 2021
• Publication Date: Aug 21, 2021
• Deposit Date: Jul 21, 2021
• Publicly Available Date: Jul 9, 2022
• Journal: Inorganic chemistry frontiers
• Print ISSN: 2052-1553
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 8
• Issue: 16
• Pages: 3916-3925
• DOI: https://doi.org/10.1039/d1qi00527h
• Public URL: https://durham-repository.worktribe.com/output/1244871