Metal‐Induced Planar Chirality of Soft‐Bridged Binuclear Platinum(II) Complexes: 100 % Phosphorescence Quantum Yields, Chiral Self‐Sorting, and Circularly Polarized Luminescence

PtII complexes have attracted a great deal of interest due to their rich phosphorescent properties. However, these square‐planar PtII complexes are far more likely to encounter the problems of lack of metal‐induced chirality and emission “aggregation‐caused quenching”. Herein, soft‐bridged binuclear...

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Published in:Angewandte Chemie International Edition 2023-05, Vol.62 (21), p.e202302011-n/a
Main Authors: Song, Jintong, Xiao, Hui, Zhang, Bao, Qu, Lang, Zhou, Xiangge, Hu, Ping, Xu, Zong‐Xiang, Xiang, Haifeng
Format: Article
Language:English
Subjects:
Amino acids
Binuclear PtII Complexes
Chirality
Chirality Self-Sorting
Circular polarization
Circularly Polarized Luminescence
Emitters
Ligands
Light emitting diodes
Organic Light-Emitting Diodes
Phosphorescence
Stereoselectivity
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Summary:PtII complexes have attracted a great deal of interest due to their rich phosphorescent properties. However, these square‐planar PtII complexes are far more likely to encounter the problems of lack of metal‐induced chirality and emission “aggregation‐caused quenching”. Herein, soft‐bridged binuclear PtII complexes bearing metal‐induced planar chirality were synthesized and characterized. These soft bridging ligands with smaller conjugated system would help to not only improve solubility for synthesis and enantioseparation but also introduce point chirality from amino acid for highly efficient diastereoselectivity. Furthermore, the intramolecular Pt−Pt distances could be well regulated by soft bridging ligands, and consequently the phosphorescence quantum yield up to 100 % could be achieved by shortening intramolecular Pt−Pt distance for first time. These complexes can be used as emitters in highly efficient solution‐processed organic light‐emitting diodes. Racemic (R)/(S) and enantiopure (D,R,D)/(L,S,L) binuclear PtII complexes with metal‐induced planar chirality were designed and prepared by using soft‐bridged achiral and chiral ligands, respectively. Their phosphorescence quantum yields up to 100 % can be achieved by shortening intramolecular Pt−Pt distance for highly efficient solution‐processed circularly polarized OLEDs.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202302011