%AGauthier, Etienne [Univ Rennes CNRS ISCR—UMR 6226 ScanMat – UMS 2001 35000 Rennes France]%AAbella, Laura [Department of Chemistry University at Buffalo State University of New York Buffalo NY 14260 USA]%AHellou, Nora [Univ Rennes CNRS ISCR—UMR 6226 ScanMat – UMS 2001 35000 Rennes France]%ADarquié, Benoît [Laboratoire de Physique des Lasers Université Paris 13 CNRS Villetaneuse France]%ACaytan, Elsa [Univ Rennes CNRS ISCR—UMR 6226 ScanMat – UMS 2001 35000 Rennes France]%ARoisnel, Thierry [Univ Rennes CNRS ISCR—UMR 6226 ScanMat – UMS 2001 35000 Rennes France]%AVanthuyne, Nicolas [Aix Marseille University CNRS Centrale Marseille, iSm2 13284 Marseille France]%AFavereau, Ludovic [Univ Rennes CNRS ISCR—UMR 6226 ScanMat – UMS 2001 35000 Rennes France]%ASrebro‐Hooper, Monika [Faculty of Chemistry Jagiellonian University Gronostajowa 2 30-387 Krakow Poland]%AWilliams, J. [Department of Chemistry Durham University Durham DH1 3LE UK]%AAutschbach, Jochen [Department of Chemistry University at Buffalo State University of New York Buffalo NY 14260 USA]%ACrassous, Jeanne [Univ Rennes CNRS ISCR—UMR 6226 ScanMat – UMS 2001 35000 Rennes France]%BJournal Name: Angewandte Chemie International Edition; Journal Volume: 59; Journal Issue: 22; Related Information: CHORUS Timestamp: 2023-08-29 20:09:13 %D2020%IWiley Blackwell (John Wiley & Sons) %JJournal Name: Angewandte Chemie International Edition; Journal Volume: 59; Journal Issue: 22; Related Information: CHORUS Timestamp: 2023-08-29 20:09:13 %K %MOSTI ID: 10152076 %PMedium: X %TLong‐Lived Circularly Polarized Phosphorescence in Helicene‐NHC Rhenium(I) Complexes: The Influence of Helicene, Halogen, and Stereochemistry on Emission Properties %XAbstract

The first enantiopure chiral‐at‐rhenium complexes of the formfac‐ReX(CO)3(: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.

%0Journal Article