Thermoinduced structural-transformation and thermochromic luminescence in organic manganese chloride crystals

Sun, Mo; Li, Yao; Dong, Xi‐Yan; Zang, Shuang‐Quan

doi:10.1039/c8sc04711a

Cited by 104 publications

(65 citation statements)

References 27 publications

(18 reference statements)

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“…These complexes also show intensive green phosphorescence with the decay time in microseconds ( Table 2). [26,34,41,49,53,[58][59][60][61][62][63][64][65][66][67][68]44] As shown in Figure 5, Kovalenko et al prepared three manganese(II) complexes (16a-c) bearing 1-benzyl-1-trimethylammonium cation (Bz(Me) 3 N + ) to show the trends in the emission properties. [44] The PL excitation spectra for these complexes are shown in Figure 5a-c.…”

Section: Manganese(ii) Complexes Based On Ammonium Saltsmentioning

confidence: 99%

Phosphorescent Manganese(II) Complexes and Their Emerging Applications

Tao

Liu

Wong

2020

Advanced Optical Materials

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light-emitting device (OLED) in 1998, [1] phosphorescent transition-metal complexes, especially for noble metal-based ones (e.g., iridium(III), platinum(II), etc.) as triplet emitters toward highly efficient organic electroluminescence, have aroused extensive attention. [15-21] Owing to strong spin-orbit coupling effect, these complexes may use both singlet and triplet excitons to greatly enhance the efficiency of OLED, breaking the upper limit of the conventional fluorescent device efficiency. Due to their unique properties of excited states, they also have extended their applications in other fields, for instance, catalysis, organic solar cells, organic memory devices, biological sensing and imaging, photodynamic therapy, information recording, and security protection, etc. [22-27] Although extensive works have been done to the design and preparation of phosphorescent materials based on noble metals, these noble metals usually have some disadvantages (such as high cost and low abundance in nature), thereby limiting their practical applications. The relatively abundant and cheap PTMCs of low toxicity have drawn considerable interests very recently. [4,23,24,28-31] Many kinds of non-noble metal-based PTMCs such as copper(I), tungsten(VI), and manganese(II) complexes have emerged rapidly. [4,23-25,28-31] Phosphorescent manganese(II) complexes show great potentials in many applications, due to their features including highly efficient phosphorescence, flexible design in molecular structure, ease of synthesis, and rich physical properties (e.g., triboluminescence, stimuli-responsivity, etc.). [24,25a,32-36] Compared with the noble metals, manganese element with an atomic number of 25 has abundant reserves, is environmentally friendly and inexpensive. Moreover, it has richer valence and coordination mode, which has been widely used in the fields of catalysis, ferroelectric, and magnetic materials. [37-39] Among the various valence states of manganese ion, the divalent manganese ion having a 3d 5 electron configuration has a 4 T 1 − 6 A 1 radiative transition closely related to the crystal field strength. The crystal field strength in the metal complex highly depends on the chemical structure of the ligand and the coordination number. These features make the manganese(II) complexes having rich photophysical properties. By regulating the ligand structure, the organic counterion and the coordination number of the manganese(II) complex, the green, yellow, orange, red, or even near-infrared phosphorescence can be achieved. [23-25,36,40] It Phosphorescent manganese(II) complexes are emerging as a new generation of phosphorescent materials showing great potentials in many applications, owing to their unique features including highly efficient phosphorescence, diverse structural/molecular design, and ease of synthesis, structural diversity, rich physical properties (e.g., triboluminescence, stimuli-responsivity, etc.), high abundance, and low cost. The research on phosphorescent manganese(II) complexes is just in its infancy...

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Section: Manganese(ii) Complexes Based On Ammonium Saltsmentioning

confidence: 99%

Phosphorescent Manganese(II) Complexes and Their Emerging Applications

Tao

Liu

Wong

2020

Advanced Optical Materials

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“…Overall, the environment temperature plays the crucial role in the competition of two distinct emitting states, and similar phenomenon have been observed in some hybrid metal halides. [22][23][24][25] In addition to the highly remarkable optical properties, [(NH 4 ) 2 ]CuPbBr 5 also show high structural and photophysical stabilities. Based on thermogravimetric analyses (TGA), [(NH 4 ) 2 ]CuPbBr 5 can be stable up to about 300 8C indicating the sufficient thermal stability ( Figure S8).…”

Section: Angewandte Chemiementioning

confidence: 99%

Three‐Dimensional Cuprous Lead Bromide Framework with Highly Efficient and Stable Blue Photoluminescence Emission

et al. 2020

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Considering the instability and low photoluminescence quantum yield (PLQY) of blue‐emitting perovskites, it is still challenging and attractive to construct single crystalline hybrid lead halides with highly stable and efficient blue light emission. Herein, by rationally introducing d10 transition metal into single lead halide as new structural building unit and optical emitting center, we prepared a bimetallic halide of [(NH4)2]CuPbBr5 with new type of three‐dimensional (3D) anionic framework. [(NH4)2]CuPbBr5 exhibits strong band‐edge blue emission (441 nm) with a high PLQY of 32 % upon excitation with UV light. Detailed photophysical studies indicate [(NH4)2]CuPbBr5 also displays broadband red light emissions derived from self‐trapped states. Furthermore, the 3D framework features high structural and optical stabilities at extreme environments during at least three years. To our best knowledge, this work represents the first 3D non‐perovskite bimetallic halide with highly efficient and stable blue light emission.

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“…The observations reveal that several Zn II –Schiff‐base complexes are weak or non‐emitter in the solution state, however, they emit efficiently in the solid state. The enhancement in the luminescence properties in solid state is due to formation of aggregates as a result of several associative intermolecular chemical interactions among molecules such as π–π stacking . This phenomenon is known as aggregation induced emission (AIE) that can be utilized in making efficient light‐emitting materials in solid state which can be useful in fabricating electro‐optical devices.…”

Section: Introductionmentioning

confidence: 99%

Isolation and Characterization of Different Homometallic and Heterobimetallic Complexes of Nickel and Zinc Ions by Controlling Molar Ratios and Solvents

et al. 2019

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This work describes employment of two structurally similar Schiff‐base ligands (H2L and H2L‐Me) [H2L = C14H13NO3 and H2L‐Me = C15H15NO3] for the synthesis of three homo‐metallic ZnII and two hetero‐bimetallic ZnII–NiII based multinuclear complexes {[ZnII4L4(MeOH)2] (1), [ZnII5(L)5(MeOH)2]·MeOH·CH3CN (2), [(L)2ZnII4Cl2(µ3‐OMe)2(MeOH)2]·2MeOH (3), [NiII2ZnII2(L)4(MeOH)2] (4) and [Ni3Zn2(L‐Me)5(H2O)2]·MeOH·CH3CN (5)} with different interesting structural core topologies. All of these complexes (1–5) have been characterized by single‐crystal X‐ray diffraction (XRD), elemental analysis, and UV/Vis and Fourier transform infrared (FTIR) spectroscopy. The fluorescence properties of ZnII‐containing complexes have been studied by measuring fluorescence spectra in solid state and solution phase. The luminescence behavior has been further quantified by fluorescence life‐time and quantum yield measurements. Using high resolution mass spectrometry (HR‐MS), the molecular integrity of complexes in the solution phase has been demonstrated by simulating isotopic distribution of molecules with theoretically calculated molecular isotopic patterns. The magnetic properties of ZnII–NiII containing complexes (4–5) have been studied in the temperature range from 5 K to 300 K. Thermogravimetric analysis (TGA) has been carried out to study the thermal stabilities of these complexes (1–5).

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Thermoinduced structural-transformation and thermochromic luminescence in organic manganese chloride crystals

Abstract: The [Mn2Cl9]5− mode in the binuclear red emissive (C4NOH10)5Mn2Cl9·C2H5OH is cleaved into [MnCl4]2− in the green emissive (C4NOH10)2MnCl4.

Cited by 104 publications

References 27 publications

Phosphorescent Manganese(II) Complexes and Their Emerging Applications

Phosphorescent Manganese(II) Complexes and Their Emerging Applications

Three‐Dimensional Cuprous Lead Bromide Framework with Highly Efficient and Stable Blue Photoluminescence Emission

Isolation and Characterization of Different Homometallic and Heterobimetallic Complexes of Nickel and Zinc Ions by Controlling Molar Ratios and Solvents

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