SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
·
IF 4.098
Qinghua Hu,Tao Gong,Yu Mao,Qiang Yin,Yuyuan Wang,Hongqing Wang
In this paper, we specifically designed and synthesized an excellent colorimetric and ratiometric fluorescent sensor DPA-CI for rapid and convenient detection of the highly toxic phosgene. DPA-CI was developed by incorporated a diphenylamine (DPA) and a 2-imine-3-benzo[d]imidazole as the enhanced push–pull electronic structure into the coumarin fluorophore matrix. The sensor DPA-CI towards phosgene sensing exhibited both visible colorimetric and ratiometric fluorescent color change in solution and in gaseous conditions with TICT and AIE mechanism respectively, which can be easily distinguished by using the naked eye. Also, the sensor DPA-CI showed splendid sensing performance such as excellent selectivity, rapid response (less than 8 s in THF and 2 min in gaseous condition), and fair sensitivity (limit of detection less than 0.11 ppm in gaseous condition and 0.27 μM in solution). The design strategy based on enhanced push–pull electronic structure with AIE and TICT properties will be helpful to construct a solid optical sensor with excellent potential application prospects for portable and visual sensing of gaseous phosgene through distinct color and ratiometric fluorescence change by the naked eyes.
研究领域:
化学
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材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 39
·10472-10479
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IF 5.976
Man Du,Baolong Huo,Jiemin Liu,Mengwen Li,Ao Shen,Xue Bai,Yaru Lai,Leqiu Fang,Yunxu Yang
In this paper, a new near-infrared and fluorogenic fluorescent probe (SiR-amide) based on Si-rhodamine for the detection of phosgene is reported. The fast and sensitive phosgene detection was achieved by the conversion reaction of an amide to a nitrile, which resulted in a large fluorescence turn-on response. The response time of SiR-amide to phosgene was 4 min with a detection limit of 8.9 nM in solution. Moreover, easy-to-use paper test strips for fluorescence detection of phosgene gas had also been prepared. All of this work provided a very promising fluorescent probe for rapid, selective and sensitive detection of phosgene both in solution and in the gas phase.
研究领域:
化学
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环境科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
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2021
·
IF 4.889
Yongning Bian,Yaling Wang,Houqun Yuan,Guang-Ming Bao,Dongdong Su
Phosgene is a suffocating toxic gas that seriously threatens human health and public security. In this work, we devised a colorimetric and fluorogenic chemosensor ( BDY ) for phosgene by using 3,5-dimethyl BODIPY as a fluorescent reporter and o -phenylenediamine as the recognition site. The BDY sensor displayed an obvious color change from yellow to pink in conjugation with a fluorescence turn-on response due to nucleophilic substitution and cyclization reactions with phosgene. BDY could detect phosgene with a rapid response (9 s), low detection limit (14 nM), and outstanding selectivity. Moreover, BDY -loaded test strips were prepared to serve as portable and sensitive kits for real-time visual monitoring phosgene with good performance.
研究领域:
化学传感
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环境监测
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
·
2014
·Vol. 2014
·期 34
·7572-7576
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IF 3.154
Lijing Fang,Chunlei Wu,Zaidan Yu,Peng Shang,Yongxian Cheng,Yuefeng Peng,Wu Su
Graphical A highly efficient protocol for the triphosgene-mediated solid-phase coupling of proteinogenic amino acids is developed and applied to the first total synthesis of the bioactive natural octacyclopeptide brachystemin A. A reproducible, highly efficient, and racemization-free protocol for the triphosgene-mediated solid-phase coupling of proteinogenic amino acids was developed. The efficiency of the reaction was demonstrated by the first total synthesis of the bioactive natural octacyclopeptide brachystemin A. This protocol will broaden the application of triphosgene in the synthesis of a wide range of peptides, including aromatic amino acids, N -alkylated amino acids, as well as proteinogenic amino acids.
研究领域:
有机化学
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药物化学
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生物合成
✓ 已验证
DOI
高影响因子
SENSORS
·
2025
·Vol. 25
·期 2
·407
·
IF 3.5
Yingzhen Zhang,Jun Xiao,Ruiying Peng,Xueliang Feng,Haimei Mao,Kunming Liu,Zhenzhong Liu,Chunxin Ma
The detection of highly toxic chemicals such as phosgene is crucial for addressing the severe threats to human health and public safety posed by terrorist attacks and industrial mishaps. However, timely and precise monitoring of phosgene at a low cost remains a significant challenge. This work is the first to report a novel fluorescent system based on the Intramolecular Charge Transfer (ICT) effect, which can rapidly detect phosgene in both solution and gas phases with high sensitivity by integrating a benzo[1,2-b:6,5-b’]dithiophene-4,5-diamine (BDTA) probe. Among existing detecting methods, this fluorescent system stands out as it can respond to phosgene within a mere 30 s and has a detection limit as low as 0.16 μM in solution. Furthermore, the sensing mechanism was rigorously validated through high-resolution mass spectrometry (HRMS) and density functional theory (DFT) calculations. As a result, this fluorescent probing system for phosgene can be effectively adapted for real-time, high-sensitivity sensing and used as a test strip for visual monitoring without the need for specific equipment, which will also provide a new strategy for the fluorescent detection of other toxic materials.
研究领域:
化学
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环境科学
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毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Shutong Pang,Hualiang An,Guirong Wang,Xinqiang Zhao,Yanji Wang
Methylcyclohexyl-2,4-diisocyanate (HTDI) is an upgraded product of toluene-2,4-diisocyanate. HTDI-derived polyurethane products show excellent properties such as nonyellowing degeneration, light stability, and weather resistance. The cleavage of dimethyl methylcyclohexyl-2,4-dicarbamate (HTDC) is a crucial step for phosgene-free synthesis of HTDI. In this work, the catalytic performance of ZnO nanoparticles (NPs) with different particle sizes was evaluated for the cleavage of HTDC, and the result showed that the selectivity of HTDI up to 81.3% was achieved with a 94.2% conversion of HTDC over a 19.1 nm ZnO catalyst. It was found from the results of experiments and characterizations that the decrease in ZnO NPs particle size led to the following circumstances: (1) the specific surface area increased, (2) the crystal preferred orientation shifted from the (100) plane to the (002) plane, and (3) the oxygen vacancy concentration increased. The first-principles calculation results showed that two electrons left from the formation of an oxygen vacancy on the ZnO surface could transfer to the neighboring Zn site. Thus, the electron-withdrawing ability of the Zn site is changed and the structure of the ZnO surface is rearranged, which facilitates the inhibition of side reactions. Therefore, changing the concentration of oxygen vacancies and then adjusting the electron-withdrawing ability of Zn sites on the ZnO surface are an effective way to achieve highly selective synthesis of HTDI by the cleavage of HTDC.
研究领域:
催化
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Bolang Wu,Ge Zhu,Alain Dufresne,Ning Lin
Generally produced by solvent sublimation via freeze-drying or critical point drying treatment, nanocellulose-based aerogels have attracted considerable interest in offering the features such as sustainability, available surface reactivity, lightweight, high porosity, and specific surface area. This study presents a novel strategy for the preparation of fluorescent aerogels based on covalent linkage between the natural skeleton of a cellulose nanofibril (CNF) and a fluorescent carbon dot (CD). The maximum CD grafting content on the CNF-based aerogel was 113 mg g–1, providing bright blue fluorescence under ultraviolet radiation with a high fluorescence quantum yield of 26.2%. Besides improved mechanical properties with a 360% increase in compression strength, the covalently bonded CD nanoparticle further serves as a structural stabilizer to endow the characteristic of shape recovery in water for the fabricated fluorescent aerogel. Finally, this aerogel displays high sensitivity and selection on the recognition of NOx and aldehyde species, which is studied for the detection of glutaraldehyde at ultralow concentrations (ppm) in water. Using the innovation of an organic solvent-free route and avoiding the toxic crosslinking reagents or fluorescent sources, the CNF/CD-based fluorescent aerogel developed in this study is a promising functional material for potential optical sensing application.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
·
IF 4.464
Yajian Duan,Chaojuan Li,Yaxin Hua,Shuai Wu,Yaqing Guo,Xiaogang Zhang,Yuqi Hu,Bin Yang,Yongnian Dai,Jin Shi
A novel membrane electrolysis cell has been designed to convert CO 2 into CO in organic electrolyte, with Cl 2 produced on the anode from NaCl oxidation in aqueous solution. The obtained CO and Cl 2 can be used as the feedstock to produce phosgene. Phosgene is a widely used acylating agent in a chemical industry, which can be used as feedstock to produce numerous high-value chemicals. Through this route, CO 2 can be converted into useful chemical, with huge economic profits created in this process. Our experiment results demonstrate that CO 2 can be efficiently converted into CO in our designed electrolyzer, and NaCl can be efficiently oxidized to Cl 2 . During long-term electrolysis process, NaHCO 3 is generated and accumulated between the membrane and the cathode. This phenomenon provides clear evidence for us to better understand the mechanism of CO 2 electro-reduction in organic electrolyte.
研究领域:
化学工程
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电化学
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环境科学
✓ 已验证
DOI
高影响因子
TALANTA
·
2020
·
IF 5.339
Lei Yang,Feng Wang,Jie Zhao,Xiaojian Kong,Ke Lu,Mian Yang,Jin Zhang,Zhiwei Sun,Jinmao You
Due to the potential threats of phosgene and nitrite to public health and safety, in this work, we first proposed the application of a facile dual-function fluorescent probe 2-(1H-Benzimidazol-2-yl)Aniline (BMA) for the detection of phosgene and nitrite in different solvent environments. BMA had fast response (1 min), high selectivity and sensitivity (the limit of detection was 1.27 nM) to phosgene in CH 3 CN solution (containing 10% DMSO), which manifested as a ratiometric fluorescent mode from 416 nm to 480 nm. The response of BMA to nitrite in HCl solution (pH = 1, containing 10% CH 3 CN) was also highly selective and sensitive (the limit of detection was 60.63 nM), which shown as a turn-off fluorescent mode at 485 nm. In addition, two portable chemosensors (BMA-loaded TLC plates and test strips) had also been successfully manufactured for the detection of phosgene in the gas phase and nitrite in solution, which displayed good responses. Most importantly, BMA had also been successfully used for detection of nitrite in food samples, and a good recovery (88.5%–107.2%) was obtained by adding standard sodium nitrite .
研究领域:
分析化学
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公共健康
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环境科学
✓ 已验证
DOI
高影响因子
SPECTROSCOPY LETTERS
·
2017
·
IF 0.794
Heyue Wei,Hui Li,Ping Liu,Xin Tao,Changchun Fan,Long Li,Ruoqiu Zhang,Yiping Du
A simple, rapid, sensitive, and selective method was proposed to detect phosgene by solid-phase extraction coupled with ultraviolent diffuse reflectance spectroscopy. First, phosgene reacts with aniline solution to produce N,N′-diphenylcarbamide, then nylon membrane was selected as solid-phase material to enrich N,N′-diphenylcarbamide and separate it from mixture solution. At last, nylon membrane-concentrated N,N′-diphenylcarbamide was measured directly to collect ultraviolent diffuse reflectance spectrum without any elution. Some parameters such as membrane pore, vacuum degree, and volume of sample were optimized. Under the optimal conditions, the relationship between the mass x of phosgene and absorbance y at 257 nm was described in a linear equation of y = 0.0141x + 0.0025 with a squared correlation coefficient of 0.9920, the limit of detection of phosgene was estimated as low as 0.2466 µg. The developed method was evaluated by applying to detect phosgene content in real samples and comparing with aniline in ultraviolet spectrophotometric method, which is adopted by the standard method of China. The relative errors of two methods were between −7.03% and 3.60%, and the relative standard deviations were from 6.55% to 9.31%, which are comparable to the standard method and verified the feasibility of the current method. These results demonstrated that the proposed method could be applied to the detection of phosgene with good accuracy and precision.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 12
·7140-7155
·
IF 9.3
Yunhan Bai,Jianqi Tang,Xiaoshu Ding,Xinqiang Zhao,Yanji Wang
Given the enormous safety risks and environmental pollution that restrict the green development of isocyanate produced by phosgene reactions, we propose a new green and intrinsically safe route for synthesizing diisocyanates containing the furan ring from 5-hydroxymethylfurfural. In this work, the following novel reactions have been systematically investigated, including synthesizing a new compound methyl furan-2,5-dimethylene dicarbamate (FDC) using 2,5-bis(aminomethyl)furan (BAF) and dimethyl carbonate (DMC), the selective hydrogenation of FDC to a new compound methyl tetrahydrofuran-2,5-dimethylene dicarbamate (THFDC), and FDC and THFDC catalytic decomposition to produce corresponding furan-2,5-dimethylene diisocyanate (FDI) and tetrahydrofuran-2,5-dimethylene diisocyanate (THFDI). The results showed that CH3ONa could effectively catalyze the synthesis of FDC from BAF and DMC, and the separation yield of FDC was 98.1% under mild conditions including a nBAF : nDMC ratio of 1 : 10 at 70 °C for 4 h. CH3ONa can be recycled up to four times with high stability. A 0.5% Pd/γ-Al2O3 catalyst with low Pd loading was prepared, and it showed high catalytic activity and stability for FDC hydrogenation to THFDC, with a THFDC yield of 99.9% at 100 °C, 2 MPa H2 and 1 h, and the catalyst could be reused after simple treatment with ethanol. The structure–activity relationship of supported Pd catalysts was studied. The conditions for the thermal decomposition reactions of FDC and THFDC were optimized, resulting in FDI and THFDI yields as high as 89.6% and 92.8%, respectively. Owing to the urgent need for raw materials sustainability and environmental friendliness, the brand-new safe pathway for synthesizing FDI and THFDI was constructed, significantly improving the competitiveness of the non-phosgene method in preparing bio-based isocyanate.
研究领域:
化学工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Xiuzhen Wei,Songxue Wang,Yingying Shi,Hai Xiang,Jinyuan Chen
A positively charged, composite, hollow-fiber nanofiltration (NF) membrane was fabricated by interfacial polymerization using polyethylenimine and trimesoyl chloride as reactive monomers. Rejection rates of different salts and dyes were measured by the NF membranes at various pH values. The effects of dye and salt concentrations on the membrane performance for dye purification were investigated. The dye and salt rejection rates would gradually decrease with an increase in the dye and salt concentrations. Then the influence of the volume concentration factor on dye purification during constant volume batch diafiltration process was studied. The results indicated that the higher of the concentration factor was, the better the concentration effect would be, and the less time would be needed.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）