Dual-emissive transition-metal complexes and their applications as ratiometric photoluminescent probes

Wu, Si‐Hai; Gong, Zhong‐Liang; Shao, Jiang‐Yang; Yang, Rong; Zhong, Yu‐Wu

doi:10.1360/ssc-2019-0151

Cited by 3 publications

(1 citation statement)

References 20 publications

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“…Emissive transition metal complexes (TMCs) with dual or multiband emissions have attracted much attention because of their intriguing luminescence properties [1,2]. A number of dual-emissive mononuclear TMCs have been developed including ruthenium [3][4][5][6][7], iridium [8][9][10], platinum [11], and other metal complexes [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Photophysical, and Computational Studies of a Bridged IrΙΙΙ-PtΙΙ Heterodimetallic Complex

Gong

et al. 2021

Crystals

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An IrIII-PtII heterodimetallic complex [(ppy)2Ir(dapz)PtCl2]Cl (4), together with the corresponding monometallic complexes [(dapz)PtCl2] (2) and [(ppy)2Ir(dapz)]Cl (3) was designed and prepared, where dapz is 2,5-di(N-methyl-N′-(pyrid-2-yl)amino)pyrazine and ppy is 2-phenylpyridine, respectively. Single-crystal X-ray analysis was carried out for complex 4, displaying the intermolecular Pt∙∙∙Pt and aromatic plane∙∙∙plane distances of 3.839 and 3.886 Å, respectively. The monometallic complex 2 exhibits a single emission maximum at 432 nm with a shorter excited-state lifetime (τ) of 6 ns, while complex 3 exhibits an emission band at 454 nm with a longer excited-state lifetime of 135 ns in CH3CN (N2-saturated) under ambient conditions. In contrast, the heterodimetallic complex 4 displays intriguing excitation wavelength-dependent dual singlet and triplet emissions. Theoretical calculations of the electronic structures and absorption spectra of these complexes were carried out to assist the interpretation of these experimental findings.

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Section: Introductionmentioning

confidence: 99%

Synthesis, Photophysical, and Computational Studies of a Bridged IrΙΙΙ-PtΙΙ Heterodimetallic Complex

Gong

et al. 2021

Crystals

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Ligand Engineering toward Deep Blue Emission in Nonplanar Terdentate Platinum(II) Complexes

Shao

Zhao

et al. 2021

Organometallics

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Eight nonplanar terdentate cyclometalated Pt(II) complexes (Pt1−Pt8) have been designed and synthesized with the general formula [Pt(N ∧ C ∧ N)Cl], where N ∧ C ∧ N represents 1,3-bis(N-methyl-N′-(pyridin-2-yl)amino)benzene (H-L) derivatives with various substituents (−CH 3 , −OCH 3 , −Cl, and −CF 3). These complexes were fully characterized via a wide array of spectroscopic and X-ray single-crystal diffraction techniques. The electrochemical, photophysical and electroluminescence properties of these compounds have been investigated. As determined by the X-ray single-crystal structures of Pt1 with −CF 3 substituents and [Pt(L)Cl] (Pt3), both of them possess a nonplanar configuration but show different intermolecular interactions. In dilute solution, all of these complexes show deep blue emission. However, the emission of the corresponding doped PMMA films can be varied from greenish yellow to deep blue by introducing electron-withdrawing (−Cl or −CF 3 ) to electron-donating (−CH 3 or −OCH 3 ) substituents. Accordingly, Pt1 with −CF 3 substituents displays concentration-dependent emission properties with an additional excimeric emission band centered at 550 nm, resulting in a greenish yellow emission in the doped PMMA film. Pt7 and Pt8 with electron-donating groups (−CH 3 for Pt7, −OCH 3 for Pt8) show deep blue emission in both solution and the doped thin films. Sky blue emission was observed in PMMA films doped with Pt2−Pt6. A bluish green organic light-emitting diode with a maximum EQE of 3.7% was fabricated using Pt7 as the dopant emitter with CIE coordinates of (0.2822, 0.3602). In addition, density functional theory (DFT) and time-dependent DFT (TDDFT) calculations were carried out to investigate the theoretical molecular orbitals and energies of the studied complexes. This work provides an effective molecular-structure-design approach to develop deep blue phosphorescent emitters.

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Dual-Emissive Monoruthenium Complexes of N(CH3)-Bridged Ligand: Synthesis, Characterization, and Substituent Effect

Wu,

Zhang,

Zheng

et al. 2023

Materials

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Three monoruthenium complexes 1(PF6)2–3(PF6)2 bearing an N(CH3)-bridged ligand have been synthesized and characterized. These complexes have a general formula of [Ru(bpy)2(L)](PF6)2, where L is a 2,5-di(N-methyl-N’-(pyrid-2-yl)amino)pyrazine (dapz) derivative with various substituents, and bpy is 2,2′-bipyridine. The photophysical and electrochemical properties of these compounds have been examined. The solid-state structure of complex 3(PF6)2 is studied by single-crystal X-ray analysis. These complexes show two well-separated emission bands centered at 451 and 646 nm (Δλmax = 195 nm) for 1(PF6)2, 465 and 627 nm (Δλmax = 162 nm) for 2(PF6)2, and 455 and 608 nm (Δλmax = 153 nm) for 3(PF6)2 in dilute acetonitrile solution, respectively. The emission maxima of the higher-energy emission bands of these complexes are similar, while the lower-energy emission bands are dependent on the electronic nature of substituents. These complexes display two consecutive redox couples owing to the stepwise oxidation of the N(CH3)-bridged ligand and ruthenium component. Moreover, these experimental observations are analyzed by computational investigation.

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Dual-emissive transition-metal complexes and their applications as ratiometric photoluminescent probes

Cited by 3 publications

References 20 publications

Synthesis, Photophysical, and Computational Studies of a Bridged IrΙΙΙ-PtΙΙ Heterodimetallic Complex

Synthesis, Photophysical, and Computational Studies of a Bridged IrΙΙΙ-PtΙΙ Heterodimetallic Complex

Ligand Engineering toward Deep Blue Emission in Nonplanar Terdentate Platinum(II) Complexes

Dual-Emissive Monoruthenium Complexes of N(CH3)-Bridged Ligand: Synthesis, Characterization, and Substituent Effect

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