The Exchange of Cyclometalated Ligands

Ryabov, Alexander D.

doi:10.3390/molecules26010210

Cited by 4 publications

(1 citation statement)

References 104 publications

(169 reference statements)

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“…These results pointed to a dynamic equilibration among Ir(III) complexes, in which f-ct1b and f-ct1c are preferable products. Without a doubt, the NaOAc + TsOH catalyzed isomerization proceeded via initial protonation of one aryl cyclometalate, followed by reversible and competitive C-H activation involving both N-aryl groups [30][31][32] . Accordingly, mass production of f-ct1b or f-ct1c can be realized by repeating the catalytic conversion, followed by chromatographic separation and recycling of undesirable products.…”

Section: Catalytic Interconversion In Solutionmentioning

confidence: 99%

Electroluminescence and hyperphosphorescence from stable blue Ir(III) carbene complexes with suppressed efficiency roll-off

Yan,

Zhou,

Liao

et al. 2023

Nat Commun

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Efficient Förster energy transfer from a phosphorescent sensitizer to a thermally activated delayed fluorescent terminal emitter constitutes a potential solution for achieving superb blue emissive organic light-emitting diodes, which are urgently needed for high-performance displays. Herein, we report the design of four Ir(III) metal complexes, f-ct1a ‒ d, that exhibit efficient true-blue emissions and fast radiative decay lifetimes. More importantly, they also undergo facile isomerization in the presence of catalysts (sodium acetate and p-toluenesulfonic acid) at elevated temperature and, hence, allow for the mass production of either emitter without decomposition. In this work, the resulting hyper-OLED exhibits a true-blue color (Commission Internationale de I’Eclairage coordinate CIEy = 0.11), a full width at half maximum of 18 nm, a maximum external quantum efficiency of 35.5% and a high external quantum efficiency 20.3% at 5000 cd m‒2, paving the way for innovative blue OLED technology.

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Section: Catalytic Interconversion In Solutionmentioning

confidence: 99%

Electroluminescence and hyperphosphorescence from stable blue Ir(III) carbene complexes with suppressed efficiency roll-off

Yan,

Zhou,

Liao

et al. 2023

Nat Commun

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Electroluminescence and hyperphosphorescence from stable blue Ir(III) carbene complexes with suppressed efficiency roll-off

Chi

Yan

Zhou³

et al. 2023

Preprint

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Efficient Förster energy transfer from a phosphorescent sensitizer to a thermally activated delayed fluorescent terminal emitter constitutes a potential solution for achieving superb blue emissive organic light-emitting diodes (OLEDs), which are urgently needed for high-performance displays. Herein, we report the design of four Ir(III) metal complexes, f-ct1a ‒ d, bearing functionalized imidazo[4,5-b]pyrazinylidene fragments that are supported by an aryl cyclometalate, a vertically arranged N-aryl appendage, and two peripheral tert-butyl substituents. These Ir(III) phosphors exhibit efficient true-blue emissions and a fast radiative decay lifetime. More importantly, they also undergo facile isomerization in the presence of catalysts (NaOAc and TsOH) at elevated temperature and, hence, allow for the mass production of either emitter by chromatographic separation, followed by thermal recycling of other isomers. One OLED device with doped f-ct1c shows a peak wavelength at 472 nm and a maximum external quantum efficiency (EQE) of 20.0%. Upon introduction of the terminal emitter ν-DABNA, the resulting hyper-OLED exhibits a true-blue color (CIEy = 0.11), a FWHM of 18 nm, a maximum EQE of 35.5% and a high EQE of 20.3% at 5000 cd m‒2, paving the way for innovative blue OLED technology.

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Cyclometalated Osmium Compounds and beyond: Synthesis, Properties, Applications

et al. 2021

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The synthesis of cyclometalated osmium complexes is usually more complicated than of other transition metals such as Ni, Pd, Pt, Rh, where cyclometalation reactions readily occur via direct activation of C–H bonds. It differs also from their ruthenium analogs. Cyclometalation for osmium usually occurs under more severe conditions, in polar solvents, using specific precursors, stronger acids, or bases. Such requirements expand reaction mechanisms to electrophilic activation, transmetalation, and oxidative addition, often involving C–H bond activations. Osmacycles exhibit specific applications in homogeneous catalysis, photophysics, bioelectrocatalysis and are studied as anticancer agents. This review describes major synthetic pathways to osmacycles and related compounds and discusses their practical applications.

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The Exchange of Cyclometalated Ligands

Cited by 4 publications

References 104 publications

Electroluminescence and hyperphosphorescence from stable blue Ir(III) carbene complexes with suppressed efficiency roll-off

Electroluminescence and hyperphosphorescence from stable blue Ir(III) carbene complexes with suppressed efficiency roll-off

Electroluminescence and hyperphosphorescence from stable blue Ir(III) carbene complexes with suppressed efficiency roll-off

Cyclometalated Osmium Compounds and beyond: Synthesis, Properties, Applications

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