Biased Symmetry Breaking and Chiral Control by Self‐Replicating in Achiral Tetradentate Platinum (II) Complexes

Yang, Bo; Guo, Zou; Zhang, Shilin; Ni, Hai‐Liang; Wang, Haifeng; Xu, Wei; Yang, Cheng; Zhou, Hui; Yu, Wenhao; Luo, Kongjia

doi:10.1002/anie.202101709

Cited by 41 publications

(21 citation statements)

References 64 publications

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“…A very interesting example of the CPL materials based on the biased symmetry breaking of self-assembly from achiral molecules was reported by Yang, Zhang and Luo et al (Figure 10b) [98]. They developed an achiral platinum (II) complex 34, which could form LCs and self-organize into an enantiomerically enriched single domain without selection of handedness in twist grain boundary (TGB) phase.…”

Section: Cpl Generated From Symmetry Breaking Of Supramolecular Assembliesmentioning

confidence: 98%

Frontiers in circularly polarized luminescence: molecular design, self-assembly, nanomaterials, and applications

et al. 2021

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The research in circularly polarized luminescence has attracted wide interest in recent years. Efforts on one side are directed toward the development of chiral materials with both high luminescence efficiency and dissymmetry factors, and on the other side, are focused on the exploitations of these materials in optoelectronic applications. This review summarizes the recent frontiers (mostly within five years) in the research in circularly polarized luminescence, including the development of chiral emissive materials based on organic small molecules, compounds with aggregation-induced emissions, supramolecular assemblies, liquid crystals and liquids, polymers, metal-ligand coordination complexes and assemblies, metal clusters, inorganic nanomaterials, and photon upconversion systems. In addition, recent applications of related materials in organic light-emitting devices, circularly polarized light detectors, and organic lasers and displays are also discussed.

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Section: Cpl Generated From Symmetry Breaking Of Supramolecular Assembliesmentioning

confidence: 98%

Frontiers in circularly polarized luminescence: molecular design, self-assembly, nanomaterials, and applications

et al. 2021

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“…In contrast to other well-known octahedral phosphorescent d 6 Ir(III) complexes (e.g. Ir(ppy) 3 , ppy = 2-phenylpyridine) that have an intrinsic metal-induced Λ/Δ chirality, − the chirality of square-planar d 8 Pt(II) complexes is mainly introduced by chiral ligands. − There are limited examples of chiral Pt(II) complexes with achiral ligands. − However, their CPL has seldom been reported before, mainly due to not only the weak chirality but also the low emission quantum yield (Φ) (Figure S1) of the distorted-square-planar coordination configuration of the Pt(II) ion. For the same reason, they have not been applied in circularly polarized OLEDs (CP-OLEDs) before, even though CP-OLEDs can emit CPL directly and have extensive applications in 3D displays, optical data storage, and optical spintronics. − Up to now, just a few Pt(II) complexes with chiral ligands have been used for applications in CP-OLEDs. ,− For example, Jiang et al used chiral binaphthalene (BINA)-based mononuclear Pt(II) complexes to fabricate solution-processed CP-OLEDs, which have an external quantum efficiency (EQE) and an asymmetry factor ( g EL ) of up to 2.15% and 1.1 × 10 –3 , respectively.…”

Section: Introductionmentioning

confidence: 99%

Highly Phosphorescent Planar Chirality by Bridging Two Square-Planar Platinum(II) Complexes: Chirality Induction and Circularly Polarized Luminescence

et al. 2022

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Chiral organometallic complexes have demonstrated many potential and practical applications. However, building metal-induced chirality for square-planar complexes still remains a big challenge, because their 2D planar molecular structures are usually superimposable on their mirror images. Herein, we report a straightforward and efficient way to achieve a novel kind of planar chirality by constructing 3D double-layer molecular structures. When the achiral ligand 1,3,4-oxadiazole-2-thiol (OXT) was used to bridge two square-planar complexes, a pair of racemic R/S planar-chiral binuclear Pt(II) complexes was obtained, which could be separated by chiral high-performance liquid chromatography (HPLC). Moreover, enantiopure R,R,R or S,S,S complexes could be prepared by the use of chiral (R)-/(S)-binaphthalene-derived OXT ligands in 99% diastereoselectivity without the use of chiral HPLC. The binaphthalene groups help to ensure good solubility and a smooth amorphous thin film morphology but have little effect on the photophysical properties. The resultant complexes display strong orange-red and near-infrared phosphorescence with quantum yields of up to 83.4% and can be applied as emitters in highly efficient solution-processed organic light-emitting diodes to achieve luminance, luminance efficiency, external quantum efficiency, and an asymmetry factor of up to 3.22 × 104 cd m–2, 28.7 cd A–1, 14.3%, and 2.0 × 10–3, respectively. With a comprehensive consideration of EL efficiency and the asymmetry factor, this is the best performance among Pt(II) complex based circularly polarized OLEDs. Therefore, this work provides a new and simple strategy to build planar chirality for chiroptical and circularly polarized luminescence applications.

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“…13,14 However, the in-depth understanding of CPL is still not enough. Therefore, much effort has been devoted to developing diverse CPL-active systems, including chiral inorganic systems, [15][16][17][18] small organic systems, 19 conjugated polymers, 20,21 supramolecular assemblies, 22,23 and dye-containing liquid crystals. 24 For practical use, CPL materials bearing large luminescence dissymmetry factor (g lum ) and high emission quantum yield (F F ) are in high demand.…”

Section: Introductionmentioning

confidence: 99%

Tuning the circularly polarized luminescence of polymer-stabilized cholesteric liquid crystal films using chiral dopants

Lü

Zhou

et al. 2022

J. Mater. Chem. C

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Biased Symmetry Breaking and Chiral Control by Self‐Replicating in Achiral Tetradentate Platinum (II) Complexes

Cited by 41 publications

References 64 publications

Frontiers in circularly polarized luminescence: molecular design, self-assembly, nanomaterials, and applications

Frontiers in circularly polarized luminescence: molecular design, self-assembly, nanomaterials, and applications

Highly Phosphorescent Planar Chirality by Bridging Two Square-Planar Platinum(II) Complexes: Chirality Induction and Circularly Polarized Luminescence

Tuning the circularly polarized luminescence of polymer-stabilized cholesteric liquid crystal films using chiral dopants

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