Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 28
·7527-7532
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IF 5.976
Daiyong Chao,Wei Lyu,Yingbo Liu,Liang Zhou,Qingrui Zhang,Ruiping Deng,Hongjie Zhang
In this study, solvent-dependent emitting carbon dots (CDs) were synthesized by simple one-step hydrothermal treatment of o-phenylenediamine (oPD). The as-prepared carbon dots (o-CDs) exhibited multi-color emission and strict excitation-independent luminescence characteristics in different solvents. Moreover, multi-color emissive o-CDs/polymer films were achieved through integrating the o-CDs with different polymer matrices. Interestingly, our experimental results demonstrated that distinctive o-CDs can also be used as fluorescent probes directly for visual and quantitative detection of water in different organic solvents. These investigations broaden the application of CDs and provide an easy method to quantitatively detect the presence of water in organic solvents.
研究领域:
材料科学
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分析化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 12
·10453-10460
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IF 2.324
Yuan Rongrong,Liu Jianming,Xiang Weidong,Liang Xiaojuan
Various luminescent carbon materials are artificially synthesized and as admirable fluorescent materials because of the increased research of carbon nanodots (CDs). Herein, a novel solvent-dependent red CDs (rCDs) is introduced through solvothermal method. The as-prepared rCDs remain benzene structure and possess abundant surface function groups that endow them well solubility in various solvents. Furthermore, multicolor luminescence are observed when rCDs are dissolved in different solvents, and the emission wavelength of these materials can be well-tuned from 475 to 624 nm, which presents intensity solvent-dependent properties. Red luminescence carbon phosphors are successfully synthesized by mix rCDs with silica powder. Finally, warm white light emitting diodes (WLEDs) are constructed using rCDs powder with Ce 3+ : YAG single crystal and blue GaN chips. The results demonstrate that the rCDs can act as red component to modify the correlated color temperature (CCT) and the color rendering index (CRI) of WLEDs .
研究领域:
材料科学
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光学工程
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2021
·
IF 6.165
Shijie Xu,Huimin Zhang,Bige Qiao,Yanfei Wang
Currently, how the solvents and temperature affect the solution species and rate-determining step in the nucleation process, thus altering the nucleation behavior remains elusive. In this contribution, by employing metastable zone width (MSZW) experiments, the modified Sangwal’s theory and the molecular dynamic simulations, we explore nucleation behavior of benzoic acid (BA) in polar and non-polar solvents. We find that in methanol, the solid–liquid interfacial tension γ decreases with increasing the saturation temperature, in contrast, the value of γ increases with increasing the saturation temperature in chloroform. Furthermore, in the classical nucleation framework, we conclude that the critical nuclei size and critical Gibbs free energy monotonous decline as the driving force increases in methanol, which implies that the interfacial tension is independent of the driving force. On the contrary, the relationship between critical nucleation parameters and driving force indicates that the interfacial tension changes with the driving force in chloroform. By employing FTIR, we find that dimerization of BA is restricted in methanol, and BA always exists as the monomer even near the nucleation point, which implies that desolvation is the rate-determining step in the nucleation process. While in chloroform, we demonstrate that the form of monomers and dimers coexist in solution. As the saturation temperature increases, the equilibrium is broken and moves toward the monomer. It implies that the rate-determining step of the nucleation process of BA may change from molecular rearrangement to desolvation with increasing the saturation temperature in chloroform.
研究领域:
物理化学
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材料科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Jiaojiao Wang,Yanyan Gao,Yuexing Zhang,Dongmei Xu,Zongxin Li,Yifei Su,Fang Wang,Ning Zhang,Daopeng Zhang,Kang Wang,Yuting Chen
A versatile dihydroxylsalicylaldazine-containing fluorene (DHSF) compound was easily prepared through a one-step reaction. DHSF simultaneously exhibited solvent-regulating fluorescent OFF–ON behavior toward Al3+/Cr3+ and a dynamic OFF–ON–OFF fluorescent response toward Fe3+ in different aqueous DMF solutions with multiple absorption–ratiometric signals. These could be mainly attributed to the different binding modes between enol–keto isomers and Fe3+/Al3+/Cr3+, as proved by DFT calculation and IR spectroscopy results. Furthermore, DHSF displayed fluorescent OFF–ON–OFF and absorption–ratiometric dual responses to increasing ClO− amounts. These results, together with the fluorescent ON–OFF changes from the metal displacement of the DHSF–Al3+/Fe3+ system by Cu2+, show that monomolecular DHSF is a versatile chemosensor for sensitively detecting Al3+/Cr3+/Cu2+ and quantitatively analysing Fe3+/ClO− with practical application potential.
研究领域:
化学
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材料科学
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分析化学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiang Mao,Xia Zhao,Hao Hu,Zequan Li,Jieqing Luo,Wei Gao
Anticounterfeiting work has always been a key work related to people’s interests, and fluorescent anticounterfeiting labels are more common. However, the current anticounterfeiting model of fluorescent anticounterfeiting markers is relatively simple and easy to copy. It is urgent to develop anticounterfeiting markers with better anticounterfeiting ability. To this end, we prepared fluorescent carbon dots (CDs) with an aggregation-induced emission (AIE) effect in one step using 2,2-dithiodibenzoic acid (DTSA) and a urea hot solvent. Blue fluorescence at 475 nm is emitted under ultraviolet excitation in the dispersed state, while orange-red fluorescence at 618 nm is emitted in the aggregated state. The two states’ fluorescence quantum yields and fluorescence lifetimes are 7.4%, 1.94 ns and 19.6%, 1.61 ns, respectively, with good crystallization properties. At the same time, due to the dehydration reaction of its carboxyl group and amino group, the consumption of a large number of carboxyl and amino groups makes it aggregate in aqueous solution, while it is dispersed in lower-polarity solvents, such as acetic acid and ethanol. The conversion of the two states can make its fluorescence change, and so a solvent-dependent multilevel anticounterfeiting ink is designed, which can be used for multilevel anticounterfeiting and information encryption.
研究领域:
材料科学
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化学
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DOI
高影响因子
JOURNAL OF COORDINATION CHEMISTRY
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2016
·
IF 1.756
Liang Qin,Kuan Lu,Zhao-Yang Zheng,Dong-Ting Lin,Ji-Jun Zhao,De-Yun Ma,Feng-Lan Liang
By changing the solvent, three cadmium(II) coordination polymers (CPs), [Cd(NH2-BDC)(DMA)(H2O)]n (1), {[Cd(NH2-BDC)2(DMF)2]·H2O}n (2) and {[(Me2NH2)2Cd2(NH2-BDC)3(H2O)]·DMF·8H2O}n (3), have been synthesized based on the V-shaped linker 5-aminoisophthalic acid and Cd(NO3)2·4H2O under the same reaction temperature (140 °C) (NH2-BDC = 5-aminoisophthalate, DMA = N,N-dimethylacetamide, DMF = N,N-dimethylformamide). Compound 1 features a 1-D ladder-like infinite chain. Compound 2 is a 2-D (4,4) net when the dinuclear [Cd2(COO)4O4] is regarded as a quadruply-connected node. Compound 3 shows a 2-D hamburger-like structure. Luminescent properties of 1–3 were detected at room temperature under the same excitation and emission wavelengths of 200–600 nm with the same interval of 5 nm. Moreover, the calculation of lattice constants and volumes, and density of states of CPs 1 and 2 were carried out to get better insight into the nature of the structure and luminescence.
研究领域:
化学
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材料科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
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2016
·Vol. 5
·期 2
·427-433
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IF 5.066
Rongguo Wang,Xiaolong Lu,Lifeng Hao,Weicheng Jiao,Wenbo Liu,Jian Zhang,Feng Yuan,Fan Yang
Orthorhombic molybdenum trioxide (α-MoO3) as one kind of potential inorganic photochromic material shows a slow response, poor reversibility and monotonic coloration. Here, we provide an efficient way to improve and tune the photochromism of MoO3. Novel inorganic–organic hybrid composites were successfully prepared by intercalating n-butylamine into the layer space of α-MoO3 and enhanced photochromic properties such as a fast response, superior reversibility, and good stability were achieved. Meanwhile, the solutions of as-prepared hybrids showed solvent-dependent discoloration due to the hole scavenger effect of ethanol. A reversible transformation between an intermediate state and an enhanced, but stable state was realized by switching irradiation. The improved photochromism caused the solutions of hybrids to show diverse discoloration varying from yellow to green to blue color.
研究领域:
材料科学
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化学
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DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 9
·936
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IF 2.935
Chonglong Li,Xunhui Xu,Lei Xu,Na Liu
An optically active, amphiphilicmeta-phenylene ethynylene (m-PE) bearing a chiral amide pendant was designed and synthesized. Living polymerization ofm-PE using alkyne-Pd(II) as the initiator afforded well-defined poly(meta-phenylene ethynylene) (m-PPE). Thesem-PPEs were found to have a stable helical conformation in THF, 1,4-dioxane, and CH3CN and showed split Cotton effects over the range of 245–400 nm. The positive first Cotton effect was observed at a wavelength of approximately 308 nm, and the negative second Cotton effect was observed at a wavelength of approximately 289 nm. Them-PPEs exhibited helical conformational changes in different mixed solvents and showed effective solvent-dependent helix inversion in CHCl3/THF solutions. The sign of the Cotton effect ofm-PPE was inverted at 25 °C by varying the mixing ratio of THF and CHCl3. Finally, amphiphilic poly(meta-phenylene ethynylene)-block-polyisocyanide containing hydrophilic PPE and hydrophobic PPI segments were facilely prepared using Pd(II)-terminatedm-PPE as the macroinitiator. This block copolymer can self-assemble into well-defined spherical nanostructures in a selective THF/CH3OH solution. This efficient polymerization will open up enormous opportunities for the preparation of functional amphiphilic block copolymers in a wide variety of fields.
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2017
·Vol. 55
·期 12
·2053-2060
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IF 2.952
Rong-Rong Wang,Jun-Jie Yan,Run-Lin Yang,Dong-Hui Pan,Wen Li,Yu-Ping Xu,Li-Zhen Wang,Xin-Yu Wang,Min Yang
Aliphatic hyperbranched poly(amide-imide) was facilely prepared by employing a functional thiolactone-maleimide monomer. Highly efficient, selective and quantitative properties of amine-maleimide Michael addition and aminolysis of a thiolactone guaranteed the generation of an ABB' thiol-yne intermediate without side products, followed by consecutive thiol-yne click reaction in one-pot. The hyperbranched structure of the poly(amide-imide) was confirmed by NMR spectroscopy and triple-detector GPC/SEC analysis. Additionally, due to the presence of aminosuccinimide fluorophores and intrinsic physical property of hyperbranched polymers, this aliphatic hyperbranched poly(amide-imide) possessed solvent-dependent emission and presented good solubility in various organic solvents. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55 , 2053–2060
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2017
·
IF 2.843
Lei Yang,Yuzhuo Jin,Xiangchen Fang,Zhenmin Cheng,Zhiming Zhou
Magnetic core–shell structured Pd-based catalysts (Fe3O4@M/Pd, M = SiO2, AlOOH, TiO2, Cu3(BTC)2, and ZIF-8) were prepared and applied to semihydrogenation of phenylacetylene. The catalysts were characterized by various techniques, and it was found that the predominant chemical state of Pd species on the catalyst surface was PdO2, which was stable under the reaction condition (40 °C and 0.1 MPa H2). Among all the catalysts studied, Fe3O4@ZIF-8/Pd showed the highest selectivity to styrene, which was also superior to conventional catalysts such as Pd/C, Pd/Al2O3 and Lindlar catalyst. The high selectivity of Fe3O4@ZIF-8/Pd was mainly ascribed to the electronic effect between PdO2 and ZIF-8. Further investigation revealed that the phenylacetylene hydrogenation on Fe3O4@ZIF-8/Pd was solvent-dependent with the activity increasing with the solvent polarity. Among eight solvents tested, methanol was the most effective, with high and stable selectivity to styrene (around 92%) at complete conversion of phenylacetylene (≥99.5%) during five consecutive cycles.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 48
·期 2
·468-477
·
IF 4.099
Zhiyin Xiao,Ran Jiang,Jing Jin,Xiuqin Yang,Binyu Xu,Xiaoming Liu,Yabing He,Yi He
Four diiron(II) carbonyl complexes, [Fe2(μ-SR)3(CO)5X] (X− = Br−, I−; R = CH2CH3, CH2CH2CH3) were facilely synthesized by reacting [Fe(CO)4X2] with monothiolates. Their potential as carbon monoxide-releasing molecules (CORMs) was systematically investigated, revealing that their CO-releasing behaviour is highly solvent-dependent. Specifically, in dimethyl sulfoxide (DMSO), the CO-releasing kinetics were fast. Intermediates with a lower oxidation state might be involved in the reaction. By contrast, in less polar solvents such as methanol, acetonitrile and dichloromethane, intermediates featuring the triiron carbonyl cation, [Fe3(μ-SCH2CH3)6(CO)6]+, were isolated. The triiron intermediate underwent further decomposition to liberate CO. One of the iodo complexes was also examined for its CO-release in PBS solution when solubilised with DMSO in the presence of deoxy-Mb and the CO-release was found to be quantitative. Furthermore, kinetic analyses were performed and the CO-release in general obeyed a first-order kinetic model. Plausible CO-releasing pathways are proposed for the parent complexes and the triiron intermediate. Assessments in cytotoxicity indicated that the cytoxicity of the diiron(II) complexes varied with both the halide and thiolate and those bearing bromide and the thiolate with longer chains were more biocompatible.
研究领域:
化学
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生物学
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医学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
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2021
·
IF 4.089
Jiajun Chen,Zhinan Fan,Chi Zhang,Huatian Duan,Li-Juan Fan
To detect neomycin, one of the common antibiotics in the environment and in food and which may pose harm to human health, a fluorescence sensing system based on an amphiphilic conjugated polyelectrolyte (CPE) was constructed. The CPE, PFPE-COONa, with poly[fluorenyl-alt-p-phenyleneethynylene] (PFPE) as the backbone and carrying four pendant hydrophilic carboxylate groups and two long hydrophobic alkoxyl chains in each repeat unit, was successfully synthesized. The photophysical study found that PFPE-COONa emission was solvent dependent, displaying a 58 nm red shift in wavelength and a nearly 150-fold enhancement in intensity for the emission maximum, by varying the ratios of the mixed solvent. Based on an understanding of the photophysics, the sensing condition was optimization to dissolve PFPE-COONa in the THF/H2O mixed solvent with a ratio of 1:1. The sensing system displayed excellent sensing performance toward neomycin at a neutral pH value. The blue-to-green fluorescence color change of the polymer solution, which can be clearly observed by the naked eye, upon around 0.7 μM of neomycin and the limit of detection (LOD) was calculated to be 0.78 nM. In addition, other possible interferents had no significant influence on the detection of neomycin. The mechanism study confirmed that the polymer aggregation, which induced strong electrostatic static interaction between the carboxylate groups of high density in the polymer and the dense positively charged primary amino groups in neomycin, was the main reason for such a visually fluorescent color change. This study provides a general strategy for the future design of sensing systems for organic pollutants.
研究领域:
分析化学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
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