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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

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Jeanne Crassous

Etienne S. Gauthier

Nora Hellou

Elsa Caytan

Samuel Del Fré

Nicolas Vanthuyne

Vincent Dorcet

Ludovic Favereau

Monika Srebro-Hooper


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.


Crassous, J., Gauthier, E. S., Hellou, N., Caytan, E., Fré, S. D., Vanthuyne, N., …Srebro-Hooper, M. (2021). Triskelion-shaped iridium-helicene NHC complex. Inorganic Chemistry Frontiers, 8(16), 3916-3925.

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