Multiple yet Controllable Photoswitching in a Single AIEgen System

Wei, Peifa; Zhang, Jing‐Xuan; Zhao, Zheng; Chen, Yuncong; He, Xuewen; Chen, Ming; Gong, Junyi; Sung, Ho Yung; Williams, Ian D.; Lam, Jacky W. Y.; Tang, Benzhong

doi:10.1021/jacs.7b13364

Cited by 239 publications

(167 citation statements)

References 85 publications

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“…Photochromic molecules have emerged as critically notable mate rials for advanced photonic applications, including fluorescence imaging (1)(2)(3), smart lenses (4)(5)(6)(7)(8), optical data storage (9)(10)(11)(12)(13)(14), and anticounterfeiting (15). Current efforts in this field are focused on developing new photochromic molecules and controlling the photo chromic behavior of these materials to meet the criteria for different optoelectronic applications.…”

Section: Introductionmentioning

confidence: 99%

On-demand regulation of photochromic behavior through various counterions for high-level security printing

She

et al. 2020

Sci. Adv.

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Materials exhibiting reversible changes in optical properties upon light irradiation have shown great potential in diverse optoelectronic areas. In particular, the modulation of photochromic behavior on demand for such materials is of fundamental importance, but it remains a formidable challenge. Here, we report a facile and effective strategy to engineer controllable photochromic properties by varying the counterions in a series of zinc complexes consisting of a spirolactam-based photochromic ligand. Colorability and coloration rate can be finely tuned by conveniently changing their counterions. Through utilization of the reversible feature of the metal-ligand coordination bond between Zn2+ and the spirolactam-based ligand, dynamic manipulation of photochromic behavior was achieved. Furthermore, we demonstrated the practical applications of the tunable photochromic properties for these complexes by creating photochromic films and developing multilevel security printing. These findings show opportunities for the development of smart materials with dynamically controllable responsive behavior in advanced optoelectronic applications.

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Section: Introductionmentioning

confidence: 99%

On-demand regulation of photochromic behavior through various counterions for high-level security printing

She

et al. 2020

Sci. Adv.

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“…The fluorescence enhancement was ascribed to the formation of aggregates, indicating the AIE feature of NDHP. The emission wavelengths of the mixtures with f w =60, 70, 80, and 90 % were 552, 533, 541, and 570 nm, respectively, which were ascribed to different morphologies of the generated aggregates . The morphologies of the aggregates obtained from the ethanol/water mixtures with f w =80 and 90 % were characterized by scanning electron microscopy (SEM).…”

Section: Resultsmentioning

confidence: 79%

“…[29,30] The fluorescence enhancement was ascribed to the formation of aggregates, indicating the AIE feature of NDHP.T he emission wavelengths of the mixtures with f w = 60, 70, 80, and 90 %w ere 552, 533, 541, and 570 nm, respectively,w hich were ascribed to different morphologies of the generated aggregates. [31][32][33][34][35] The morphologies of the aggregates obtained from the ethanol/water mixtures with f w = 80 and 90 %w ere characterized by scanning electron microscopy (SEM). As shown in Figure 1B should also be relatedt ot he formation of nanosized aggregates because the aggregation could force the twisted molecules to adopt more planar conformationsb yt he restriction of the intramolecular free rotations.…”

Section: Aie Properties Of Ndhpmentioning

confidence: 99%

Aggregation‐Induced Emission‐Active 1,4‐Dihydropyridine‐Based Dual‐Phase Fluorescent Sensor with Multiple Functions

Zhou

Chen

Duan

et al. 2019

Chemistry An Asian Journal

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A N‐2‐phenylethyl‐substituted 1,4‐dihydropyridine derivative (NDHP) containing 5,5‐dimethylcyclohexane‐1,3‐dione and naphthylethylene was designed and synthesized. NDHP acts as a multifunctional fluorescent sensor in dual phases. The crystal structure analysis confirms that the NDHP molecules have highly twisted conformations. The twisted conformation results in aggregation‐induced emission properties and solid‐state emission, by restricting the intramolecular free rotation in the aggregated or solid state. In the solid state, NDHP exhibits reversible mechanochromic properties as a result of the transition between the amorphous and crystalline states. NDHP also exhibits a rare phenomenon of acid‐fumed solid‐state emission enhancement owing to the change in packing mode from a zigzag arrangement to J‐aggregation. The solid‐state stimuli‐responsive fluorescence switching is applied to realize a rewritable optical recording media and a multiple output combinational logic system. In solution, NDHP shows a selective fluorescence response for environmentally harmful Hg2+, with a limit of detection of 2.7 nm. This results from the “turn‐on” responsive behavior owing to the Hg2+‐triggered aggregation of the NDHP molecules. NDHP is also used in the imaging of intracellular Hg2+ in HeLa cells. These findings provide a feasible and attractive route for developing multifunctional fluorescent sensors for use in dual phases.

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“…As shown in Figure 2A and Figure 2B, SBA exhibited weak fluorescence in good solution of EtOH but intense fluorescence in poor solution of H 2 O, suggesting its AIE feature. [26][27][28][29][30] The aggregation of SBA in aqueous solution was confirmed by absorption spectra and dynamic light scattering (DLS). In EtOH, SBA exhibited flat baselines in absorption spectrum over 400 nm.…”

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confidence: 99%

Visualized Spontaneous Molecular Directed Motion in Solid State

Liu¹,

Xing²,

Wei³

et al. 2019

Preprint

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The real-time monitoring of spontaneous molecular directed motion is a highly important but very challenging task. In this work, a rod-like aggregation-induced emission (AIE) molecule of salicylaldehyde 4-butoxyaniline Schiff base (SBA) was deliberately designed and facilely synthesized, which exhibits unique self-recovery property from semi-ordered structure to ordered structure along with significant fluorescence change after grinding. The monitoring of the fluorescence change provides rich kinetic information including kinetic order, rate constants, half-life and the activation energy of the spontaneous molecular directed motion process. Unlike instrumental analytical methods such as PXRD and AFM, which only give the information of a stable state of samples, the fluorescence method provided a new perspective to real-time visualize spontaneous molecular directed motion in situ in solid state.

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Multiple yet Controllable Photoswitching in a Single AIEgen System

Cited by 239 publications

References 85 publications

On-demand regulation of photochromic behavior through various counterions for high-level security printing

On-demand regulation of photochromic behavior through various counterions for high-level security printing

Aggregation‐Induced Emission‐Active 1,4‐Dihydropyridine‐Based Dual‐Phase Fluorescent Sensor with Multiple Functions

Visualized Spontaneous Molecular Directed Motion in Solid State

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