PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2020
·Vol. 22
·期 5
·2849-2857
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IF 3.43
Chaoyue Zhao,Xianliang Qiao,Zenghuimin Yi,Qingxin Guan,Wei Li
A green catalyst for acetylene hydrochlorination yielding a VCM is presented using imidazole as a single component metal-free catalyst. The mechanisms and reactivities of imidazole-catalyzed acetylene hydrochlorination have been investigated by combined computational and experimental studies. The electronic effects of ortho-substituents on the reactivities have also been investigated. Through theoretical calculations and experimental studies, the nitrogen-atom including a lone pair active site of single component imidazole for metal-free acetylene hydrochlorination is proposed. It is suggested that the nitrogen-atom including a lone pair of imidazole adsorbs an HCl molecule to form an imidazole-HCl complex, which serves as the active catalyst to participate in the reaction process of acetylene hydrochlorination. Besides, the results show that C2H2 assists in the electrophilic addition of HCl, undergoing an almost planar six-membered ring transition state. Computational studies on the ortho-substitution of the active sites will have an important impact on the catalytic efficiency.
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JOURNAL OF MOLECULAR LIQUIDS
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2019
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IF 4.561
Xingyu Liu,Jinwei Gao,Guofu Zhou,Wanqiang Liu,Qianming Wang,Yuhui Zheng
The colloidal synthesis of nanoscale perovskites has generated intensive interests very recently and most of the preparation processes are performed in organic phases due to requirement of maintaining the stability. Since the exploration of CsPbX 3 assembly in aqueous medium is still rarely reported in recent years, we use the simple organic building block (2-methylimidazole, MEIM) for the first time to collect the mixture of two metal precursors (CsBr and PbBr 2 ) and CsPbBr 3 /MEIM nanocrystals have been perfectly formed with the aid of the effective organic layer in terms of coordination interactions with metal ions . Such lead halide perovskite material with diameters of 8–10 nm possesses stable and green-emitting feature in pure water. Extensive experimental conditions including reaction time, reagent ratio, addition sequence, pH/temperature dependence and solvent effect have been investigated in details. This study finds a new way to the controllable synthesis of perovskite nanoparticles in eco-friendly solvents and represents a next generation target material for utilization in opto-electronic fields.
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ELECTROCHIMICA ACTA
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2016
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IF 4.803
Han Song,Lu Zhang,Feng Yu,Bang-Ce Ye,Yingchun Li
We describe here an ultrasensitive electrochemical detection of metronidazole (MNZ) by using a freestanding Au-Ag alloy microrod (AMR) as working electrode. Nanoporous Au-Ag AMR (NPAMR) was facilely prepared by dealloying of smooth AMR and further modified with electropolymerized molecularly imprinted polymer (MIP), which affords simultaneous identification and quantification of the target molecules by cyclic voltammetry (CV) with Fe(CN) 6 3−/4− as probe to indicate the current intensity. The MIP-decorated NPAMR showed a remarkably low detection limit of 2.7 × 10 −14 M (S/N = 3) and a wide determination range from 8.0 × 10 −14 to 1.0 × 10 −6 M for MNZ. The developed sensor has been successfully applied in detection of MNZ in real samples (fish tissues and drug tablet), and admirable specificity and anti-interference capability were achieved. This protocol offers great promise for cost-effective and precisely quantitative analysis of trace biological and chemical substances without assistance of any extra working electrode.
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Journal of the Taiwan Institute of Chemical Engineers
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2016
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IF 2.848
Bin Jiang,Zhaohe Huang,Luhong Zhang,Yongli Sun,Huawei Yang,Hanrong Bi
In this work, several kinds of imidazolate-based ether-functionalized ionic liquids (ILs) were synthesized and used for CO 2 capture. It is note-worthy that IL with [C 6 O 2 mim] + as cation has much smaller molecular weight but similar mole capacity compared with those with [P 66614 ] + , which is usually used as cation for anion-functionalized ILs in the carbon capture process. Among these task functionalized ILs, [C 6 O 2 mim][4-Br-Im] can be a potential candidate for carbon capture. Not only has [C 6 O 2 mim][4-Br-Im] an extremely high CO 2 capacity (more than 1.60 mol CO 2 per mol IL achieved), but also shows high uptake efficiency and recovery capability. In addition, [C 6 O 2 mim][4-Br-Im] has higher thermal stability, higher water stability and lower absorption enthalpy. The mechanism of this carbon capture process was investigated by FT-IR and NMR spectroscopy. Surprisingly, in this process, CO 2 first bound the cations to form zwitterions. When CO 2 was continuously bubbled into ILs, the zwitterions started to dissociate and the anions combined with CO 2 . It is verified that this process is a carbon capture transforming process with the Cationic-drive transforming to Anionic-drive. This work offers a deep understanding of the combination process between CO 2 and imidazolate-based with aprotic heterocyclic anions.
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ACS Applied Materials & Interfaces
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2015
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IF 6.723
Yingchun Li,Yuan Liu,Yang Yang,Feng Yu,Jie Liu,Han Song,Jiang Liu,Hui Tang,Bang-Ce Ye,Zhipeng Sun
A novel electrochemical sensor has been developed by using a composite element of three-dimensional (3D) nanoporous nickel (NPNi) and molecularly imprinted polymer (MIP). NPNi is introduced in order to enhance the electron-transport ability and surface area of the sensor, while the electrosynthesized MIP layer affords simultaneous identification and quantification of the target molecule by employing Fe(CN)63–/4– as the probe to indicate the current intensity. The morphology of the hybrid film was observed by scanning electron microscopy, and the properties of the sensor were examined by cyclic voltammetry and electrochemical impedance spectroscopy. By using metronidazole (MNZ) as a model analyte, the sensor based on the MIP/NPNi hybrid exhibits great features such as a remarkably low detection limit of 2 × 10–14 M (S/N = 3), superb selectivity in discriminating MNZ from its structural analogues, and good antiinterference ability toward several coexisting substances. Moreover, the proposed method also demonstrates excellent repeatability and stability, with relative standard deviations of less than 1.12% and 1.4%, respectively. Analysis of MNZ in pharmaceutical dosage form and fish tissue is successfully carried out without assistance of complicated pretreatment. The MIP/NPNi composite presented here with admirable merits makes it a promising candidate for developing electrochemical sensor devices and plays a role in widespread fields.
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SENSORS AND ACTUATORS B-CHEMICAL
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2014
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IF 3.84
Liu Yuan,Liu Jiang,Tang Hui,Liu Jie,Xu Bingbin,Yu Feng,Li Yingchun
A novel electrochemical sensor for determining metronidazole (MNZ) is developed based on a composite structure of molecularly imprinted polymer (MIP) and multi-walled carbon nanotubes (MWCNTs). The morphology characterization by SEM displayed the successful deposition of polymeric layer on MWCNTs surface. A series of parameters including loading quantity of MWCNTs, pH value of polymerization system, and ratio of template and monomer are investigated and optimized during sensor preparation. It is clearly found that the MIP-decorated MWCNTs significantly enhance the electric signal response in MNZ measurement, giving rise to a remarkably low detection limit of 4.92 × 10 −5 mg L −1 ( S / N = 3), while the electro-synthesized MIP layer affords simultaneous identification and quantification of the target molecules by using Fe(CN) 6 3−/4− as probe to indicate the current intensity. In addition, the established sensor is completely reusable and maintains excellent stability. These predominant properties enlist this hybrid electrode to exhibit high reliability for analyzing real samples and detection of MNZ directly in pharmaceutical dosage form and in fish tissue is successfully carried out without assistance of any separation techniques.
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Scientific Reports
·
2015
·Vol. 5
·期 1
·1-8
·
IF 5.578
Li Yingchun,Liu Yuan,Liu Jie,Liu Jiang,Tang Hui,Cao Cong,Zhao Dongsheng,Ding Yi
Electrochemical nanosensors based on nanoporous gold leaf (NPGL) and molecularly imprinted polymer (MIP) are developed for pharmaceutical analysis by using metronidazole (MNZ) as a model analyte. NPGL, serving as the loading platform for MIP immobilization, possesses large accessible surface area with superb electric conductivity, while electrochemically synthesized MIP thin layer affords selectivity for specific recognition of MNZ molecules. For MNZ determination, the hybrid electrode shows two dynamic linear range of 5 × 10 −11 to 1 × 10 −9 mol L −1 and 1 × 10 −9 to 1.4 × 10 −6 mol L −1 with a remarkably low detection limit of 1.8 × 10 −11 mol L −1 (S/N = 3). In addition, the sensor exhibits high binding affinity and selectivity towards MNZ with excellent reproducibility and stability. Finally, the reliability of MIP-NPGL for MNZ detection is proved in real fish tissue samples, demonstrating the potential for the proposed electrochemical sensors in monitoring drug and biological samples.
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TALANTA
·
2025
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IF 6.1
Yifei Ma,Lijie Zhang,Hong Yang,Shanshan Zhu,Jinhua Liu
Highly selective and sensitive determination of dopamine (DA) from multiple sources remains a persistent and significant challenge. Here, we develop an imidazole-triggered in situ fluorescence reaction system for highly selective and sensitive determination of DA from various sources (human, horse, dog, rabbit, and mouse). The system operates by catalyzing the oxidation of DA with 1,5-Dihydroxynaphthalene (1,5-DHA) through a Lewis base formed by imidazole, leading to the rapid generation of yellow azamonardine fluorescent compounds (AFC). Notably, the system demonstrates minimal background noise and a high signal-to-noise ratio of up to 300-fold with a determination limit of 33.33 pM, making it 10-100 times more sensitive than conventional enzyme-linked immunosorbent assay (ELISA) methods. Moreover, selectivity tests reveal that our system can effectively distinguish between several common interfering substances, even at concentrations as low as 10 nM. The developed system shows promising results in detecting DA from diverse sources (humans, horses, dogs, rabbits, and mice), including urine samples from clinical patients, exhibiting good agreement with traditional ELISA kits. Therefore, the established in situ fluorescence reaction system holds great potential for the determination of DA-related disorders due to its impressive analytical capabilities.
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