Towards Fast Circularly Polarized Luminescence in 2‐Coordinate Chiral Mechanochromic Copper(I) Carbene Complexes

Author:

Muthig André M. T.1ORCID,Wieland Justin1ORCID,Lenczyk Carsten1,Koop Stefan1,Tessarolo Jacopo1,Clever Guido H.1ORCID,Hupp Benjamin1ORCID,Steffen Andreas1ORCID

Affiliation:

1. Department of Chemistry and Chemical Biology TU Dortmund University Otto-Hahn-Str. 6 44227 Dortmund Germany

Abstract

AbstractA series of chiral mechanochromic copper(I) cAAC (cAAC=cyclic (alkyl)(amino)carbene) complexes with a variety of amide ligands have been studied with regard to their photophysical and chiroptical properties to elucidate structure‐property relationships for the design of efficient triplet exciton emitters exhibiting circularly polarized luminescence. Depending on the environment, which determines the excited state energies, either thermally activated delayed fluorescence (TADF) from 1/3LLCT states or phosphorescence from 3LLCT/LC states occurs. However, neither chiral moieties at the carbene nor at the carbazolate ligands provide detectable luminescence dissymmetries glum. An exception is [Cu(phenoxazinyl)(cAAC)], showing orange to deep red TADF with λmax=601–715 nm in solution, powders and in PMMA. In this case, the amide ligand can undergo distortions in the excited state. This design motif leads to the first linear, non‐aggregated CPL‐active copper(I) complex with glum of −3.4 ⋅ 10−3 combined with a high radiative rate constant of 6.7 ⋅ 105 s−1.

Funder

Deutsche Forschungsgemeinschaft

Publisher

Wiley

Subject

General Chemistry,Catalysis,Organic Chemistry

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