JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2021
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IF 4.291
Guojie Liu,Yiwei Li,Congcong Cui,Min Wang,He Gao,Jun Gao,Jingbo Wang
1′-(4′-carboxybutyl) −3′, 3′-dimethyl-6-nitro-8-hydroxylspiro [chromene-2, 2′-indoline] (SPC) is a visual, selective, and sensitive detector to lead (Pb 2+ ) ions. The presence of 8 -hydroxyl in pyran ring makes SPC have a remarkable solvatochromism in polar solvents (SPC can isomerize to the ring-opening body (Mcc) spontaneously under visible light conditions), ascribed to the formation of intramolecular hydrogen bonds . The color and spectrum of the Mcc solution could be changed instantly and significantly by addition of Pb 2+ , and Mcc showed excellent selectivity to Pb 2+ in the simulated lead–zinc ore leachate. The complex Mcc - Pb 2+ , with a stoichiometry ratio of 1:1, can stably exist under visible light conditions, which is attributed to the interaction between Pb 2+ and the deprotonated carboxy (–COO — ), phenolic oxygen atom and 8-hydroxyl of the Mcc, and the whole process does not need UV irradiation, avoiding the serious photo-degradation of spiropyran derivatives. The low limit of detection (0.61 μM) and the established test strips indicate that SPC has the potential to be applied in the quantitative detection of Pb 2+ in real samples.
研究领域:
分析化学
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环境科学
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
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2018
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IF 4.525
Xu Dong,Pan Wu,Christian G. Schaefer,Liwu Zhang,Chris E. Finlayson,Changchun Wang
We report a convenient and scalable strategy to achieve large-area transparent photonic crystal (TPC) films that can be fully reversibly switched between an initial transparent state and a structurally-colored state. This photonic material is based on an ordered colloidal crystal structure of polymer core-shell particles with an engineered refractive index balance of the core and the shell components. Highly transparent viscoelastic quasi-solid films are created that can be spatially UV-cross-linked, giving invisible encrypted photonic patterns with different solvent response compared to non-cross-linked regions, which appear after immersion in solvent media, thus demonstrating clear and fully reversible/switchable solvatochromic properties. Our intuitive simulation models demonstrate how the emergence of structural color occurs due to increasing refractive-index contrast, whereas wavelength shifting originates from commensurate solvent swelling of the shell medium. In addition to the very clear revelation of optical patterns (large fractional changes in reflectance, from transparency to a resonant reflectivity of ~10%), these materials and thin-film generation methods are inherently scalable, robust and versatile. The demonstrated stimuli-responsive photonic films may thus give rise to new practicable applications in the fields of environmental sensing and product security.
研究领域:
材料科学
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光学
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化学工程
✓ 已验证
DOI
高影响因子
ACS Nano
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2025
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IF 16
Shuang Wang,Hao Liu,Yufan Zhang,Mengjie Wu,Yue Zhang,Jiwei Zhang,Xinran Zhou,Jiaqing Xiong
Soft robots with real-time volatile organic compound (VOC) perceptivity are promising for dynamic hazard detection. However, reconciling VOC-responsive actuation with an autonomous perception remains challenging. Inspired by Victoria amazonica, which blooms and closes with synchronous color change under environmental stimulations, we developed a solvatophore-induced solvatochromic-piezoelectric material by synthesizing a solvatochromic molecule-modified palygorskite-enhanced polyvinylidene difluoride and realized a VOC-responsive all-fiber actuator with solvatochromic and piezoelectric properties for cooperative visual and electrical perception of volatile organics. Under VOCs, the actuator exhibits bidirectional bending, obvious and stable color change, and characteristic piezoelectric output, allowing the identification of the type and concentration of the VOC. The solvatochromic-piezoelectric actuator demonstrates a large bending curvature of 4.63 cm–1, an ultrafast response speed of up to 4.36 cm–1 s–1, and excellent stability of 1500 actuation cycles without fatigue, with synchronous VOC-induced piezoelectric output reflecting actuation conditions. VOC-responsive solvatochromic and piezoelectric sensing, manipulation, and robots were demonstrated as applications. The VOC-triggered soft robot demonstrates stable motion with synchronous piezoelectric output, capable of autonomously perceiving and responding to environmental VOC. This work presents a widely applicable interactive visual-electronic VOC detection strategy for safety, health, and environmental protection, which could also inspire the exploitation of high-performance responsive fiber materials.
研究领域:
材料科学
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环境科学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2020
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IF 2.463
Zhengjun Fang,Shengqiong Tan,Feng Wu,Yinchun Jiao,Chaktong Au,Yuting Wang,Jing Shen,Bing Yi
Solvent and substituent effects on the ultraviolet absorption properties of Schiff bases were targeted both experimentally and computationally. A wide set of X-PhCH = NPhCH = CHPh-Y were prepared for this study, and their maximum absorption wavelength ( λ max ) and the corresponding energy (υ max ) in thirteen solvents were measured. The results show that the λ max of the compounds ranges from 347 to 388 nm. With increase of electron withdrawing or electron donating ability of X or Y, a bathochromic shift is observed. Furthermore, the λ max values are sensitive to the properties of solvents, while the polarity of solvents alone fails to account for the trends of solvatochromism . Computational analyses based on density functional theory were conducted to elucidate the phenomena. The polarization effect of solvent on solute can be used to measure the effect of solvent, and polarizability parameter Δη is proved to be more effective to scale the solvent effects on UV absorption of the compounds. Finally, a quantitative model has been developed to express the effects of substituent and solvent on υ max . The derived model enables practical expression of the relationship between substituents, solvents and UV absorption.
研究领域:
物理化学
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计算化学
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光化学
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分子光谱学
✓ 已验证
产品关联
DOI
高影响因子
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