Luminescent Mechanochromic 9-Anthryl Gold(I) Isocyanide Complex with an Emission Maximum at 900 nm after Mechanical Stimulation

Seki, Tomohiro; Tokodai, Noriaki; Omagari, Shun; Nakanishi, Takayuki; Hasegawa, Yasuchika; Iwasa, Takeshi; Taketsugu, Tetsuya; Ito, Hajime

doi:10.1021/jacs.7b00587

Cited by 145 publications

(81 citation statements)

References 29 publications

(32 reference statements)

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“…Regarding compound 1 , its easy synthesis and the valuable fluorescence properties of the crystals obtained could lead to applications in the field of optical materials. This compound exhibits weak MFC behaviour compared to many compounds reported in the literature, which seem more suitable for applications as MFC materials . The reason is probably that in our case the crystal packing mode is not loose enough for a dramatic MFC effect.…”

Section: Discussionmentioning

confidence: 59%

Mechanofluorochromic Properties of an AIEE‐Active 2‐Phenylbenzoxazole Derivative: More than Meets the Eye?

et al. 2019

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The presence of a dicyanovinyl group on the robust 2-phenylbenzoxazole framework led to the emergence of aggregationinduced emission enhancement (AIEE) characteristics. A mechanofluorochromic (MFC) behaviour was observed. The pristine microcrystals emitted yellow-green light, which became golden yellow upon grinding, with the reverse process observed upon heating or solvent fuming. This phenomenon was accompanied by a reversible evolution of the photoluminescence quantum yields and lifetimes. These variations were attributed to the formation of different types of emissive species in the crystalline phases and in the ground material, which is a mixture of very small microcrystals and amorphous matter. Remarkably, evidence was also given for other spectroscopic effects, which depend on the size, compactness and heterogeneity of the solid samples. These effects are presumably linked to the generation of regions rich in low-energy exciton traps in polycrystalline and pressed samples, and to light reabsorption. They are enhanced by the fact that the pristine platelets exhibit self-waveguided edge emission, and they are all the more significant as the MFC effect is rather weak.

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Section: Discussionmentioning

confidence: 59%

Mechanofluorochromic Properties of an AIEE‐Active 2‐Phenylbenzoxazole Derivative: More than Meets the Eye?

et al. 2019

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“…During last few years, metal–organic hybrid materials (such as coordination polymers, metal–organic frameworks and complexes) with mechanochromism have also been increasingly investigated. According to the mechanisms, metal–organic mechanochromic materials can be divided into two types: (1) most of as‐reported systems are metal‐centered phosphorescence emission based on altering the arrangement of metals or clusters under the mechanical stimulus, such as Au I ,4 Pt II ,5 Cu I ,6 and Ir III ,7 etc. ; (2) the others involve fluorescence emission based on the change of the stacking mode and interaction of ligands, such as ligand‐based Zn II 8 and Cd II 9…”

mentioning

confidence: 99%

Reversible Mechanochromic Delayed Fluorescence in 2D Metal–Organic Micro/Nanosheets: Switching Singlet–Triplet States through Transformation between Exciplex and Excimer

Yang

Fang

et al. 2018

Advanced Science

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Mechanochromic luminescent materials have attracted much attention and present a variety of applications in information security, data recording, and storage devices. However, most of these smart luminescent systems are based on typical fluorescence and/or phosphorescence mechanisms; the mechanochromic delayed fluorescence (MCDF) materials involving switching singlet and triplet states are rarely studied to date. Herein, new 2D layered metal–organic micro/nanosheets, [Cd(9‐AC)2(BIM)2] (named as MCDF‐1; 9‐AC = anthracene‐9‐carboxylate and BIM = benzimidazole) and its solvate form containing interlayer CH3CN (named as MCDF‐2), which exhibit reversible mechanochromic delayed fluorescence characteristics, are presented. With applying the mechanical force, the luminescent center of MCDF‐1 can be converted from 9‐AC/BIM exciplex to 9‐AC/9‐AC excimer, resulting in alternations of delayed fluorescence. Such luminescent change can be further recovered by CH3CN fumigation, accompanied by the structural transformation from MCDF‐1 to MCDF‐2. Furthermore, the force‐responsive process also refers to the energy redistribution between singlet and triplet states as inferred by both temperature‐dependent photophysics and theoretical calculations. Therefore, this work not only develops new 2D micro/nanosheets as MCDF materials, but also supplies a singlet–triplet energy switching mechanism on their reversible mechanochromic process.

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“…[4] Indeed, the materials with mechanochromismh ave attractedi ncreasing attention for their extensive applications in optoelectronic devices and chemical detectors. [5][6][7][8] Pyrene derivativesh ave been widely studied due to their high thermala nd photochemical stabilities, planar geometries and natural high charge carrierm obilities. [9,10] Pyrene moieties form different excited states,w hich can induce am ultiple photoluminescence phenomenon, involving monomer emission, dimer emission, excimer emission and emission originating from al ocally excited state as well as an intramolecular charge transfer state.…”

Section: Introductionmentioning

confidence: 99%

Multiple Photoluminescent Processes from Pyrene Derivatives with Aggregation‐ and Mechano‐Induced Excimer Emission

Wang

Zhang

Yin

et al. 2019

Chemistry An Asian Journal

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Twon ovel pyrene-based isocyanide gold(I)c omplexes have been designed and synthesized.T he different structures lead to distinct and diverse photophysical properties both in solution and in the aggregate state. Multiple photoluminescence, involving monomer emission, locally ex-cited emission and excimer emission, are observed. Notably, an excimer is formed by aggregation in solution and external mechanical stimulation in the solid state, showing aggregation-and mechano-induced excimer emission.Figure 1. Molecule structureo fPy-NC, 1 and 2.[a] Dr.

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Luminescent Mechanochromic 9-Anthryl Gold(I) Isocyanide Complex with an Emission Maximum at 900 nm after Mechanical Stimulation

Cited by 145 publications

References 29 publications

Mechanofluorochromic Properties of an AIEE‐Active 2‐Phenylbenzoxazole Derivative: More than Meets the Eye?

Mechanofluorochromic Properties of an AIEE‐Active 2‐Phenylbenzoxazole Derivative: More than Meets the Eye?

Reversible Mechanochromic Delayed Fluorescence in 2D Metal–Organic Micro/Nanosheets: Switching Singlet–Triplet States through Transformation between Exciplex and Excimer

Multiple Photoluminescent Processes from Pyrene Derivatives with Aggregation‐ and Mechano‐Induced Excimer Emission

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