JOURNAL OF ORGANIC CHEMISTRY
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2024
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IF 3.3
Rui Sun,Junyi Wang,Haoran Liang,Shuo Li,Xiao Yang
A facile and novel N-heteroarenium iodide-catalyzed hydroalkoxylation of enamides has been described. The protocol provides easy access to N,O-acetals, which proved to be a versatile synthetic synthon. The hydrosulfonylation, hydroamination, and hydrophosphorylation products of enamide could be indirectly provided from N,O-acetals. The reaction mechanism was further investigated, which indicated that the hydroalkoxylation of enamides was driven by weak coordination between enamide and the contact ion pair of N-heteroarenium iodide.
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ACS Applied Materials & Interfaces
·
2016
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IF 7.145
Lei Lv,Xiaofen Wang,Xinlong Wang,Lei Yang,Tao Dong,Zhou Yang,Hui Huang
Novel tellurophene-based n-type copolymers are synthesized and characterized with thermal analysis, electrochemistry, optical spectroscopy, and DFT calculations. The copolymers demonstrate reversible interactions with bromine. Through tuning of the building blocks and alkyl chains together with device engineering, the maximum power conversion efficiency of all-polymer solar cells improves from 2.8 to 4.3%, which is supported by photoluminescence, atomic force microscopy, transmission electron microscopy, the space charge limit current method, and exciton dynamic studies. These results suggest that tellurophene-based n-type copolymers are promising electron acceptors for organic solar cells and potential sensor materials for bromine detection.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 40
·21452-21459
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IF 8.867
Yunxia Li,Peng Miao,Wei Zhou,Xiao Gong,Xiujian Zhao
Luminescent solar concentrators (LSCs) have been widely studied because of their potential importance in industry. A variety of luminescent materials have been developed and used for LSC fabrication such as organic dyes and semiconductor quantum dots. However, fabricating LSCs with a cost-effective method and environmentally friendly materials is a great challenge. Here, N-doped carbon-dots (N-CDs) are for the first time reported to be used as phosphors for LSC fabrication. The properties of N-CDs/PMMA thin film LSCs with various thicknesses are investigated. When the N-CDs/PMMA thin film thickness is 6.67 μm and only one side of LSCs is covered by photovoltaic cells, the performance of the LSCs is optimal, and the values of Voc, Jsc, FF, ηopt and η can reach up to 0.46 V, 13.68 mA cm−2, 62.89%, 4.75% and 3.94%, respectively. Moreover, the photostability of the LSCs is excellent. Results show that N-CDs are able to be effective luminophores for LSC fabrication. Our technique makes the industrial applications of LSCs more feasible since N-CDs have advantages such as high stability, low cost, low toxicity and high photoluminescence quantum yield.
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Molecular Catalysis
·
2026
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IF 4.3
Jiarong Zhang,Christian Marcus Pedersen,Shuwei Chen,Yingxiong Wang,Yan Qiao
A green epimerization system using only water and CaCl 2 . • NMR identifies products, by-products, and reveals the mechanism. • Isotope labeling and DFT confirm the epimerization pathway. • A direct route to ManNAc from a biomass monomer. N -acetyl- d -mannosamine (ManNAc) is a valuable precursor in the pharmaceutical and biotechnology industries. Enzymatic epimerization of N -acetyl- d -glucosamine (GlcNAc) offers mild and green conditions for ManNAc production, while its productivity is limited by poor enzyme stability and high costs. Although efficient chemical methods have been developed, they often require strict control of reaction conditions to avoid by-product formation, and their reaction mechanisms remain unclear. This study presents a green and efficient strategy for ManNAc synthesis through calcium chloride (CaCl 2 )-promoted epimerization of GlcNAc in aqueous solution. ManNAc production reached a yield of 27% under optimized conditions. The reaction mechanism was elucidated through a combination of nuclear magnetic resonance (NMR) spectroscopy and density functional theory (DFT) calculations. Using deuterium oxide (D 2 O) as the reaction medium revealed hydrogen-deuterium exchange at the C2 position of GlcNAc, providing direct experimental evidence for a reaction pathway involving an enol intermediate. This finding was further supported by subsequent 13 C isotopic labeling experiments. DFT calculations further revealed that water molecules play a critical role in mediating proton transfers, significantly reducing the energy barriers of the key steps of enol intermediate formation. CaCl 2 enhanced the yield by promoting the formation of the enol intermediate. Additionally, a preliminary investigation was conducted on the purification of ManNAc from the reaction mixture containing its structural epimers. This work not only provides a green system for ManNAc synthesis but also offers profound insights into the reaction mechanism, paving the way for developing more efficient biomass utilization strategies. Download: Download high-res image (515KB) Download: Download full-size image
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Catalysis Science & Technology
·
2026
·
IF 4
Shixuan Li,Dongha Huang,Jiao He,Vasanthakumar Vasudevan,Boqing Chen,Wenjie Zhang,Tingting Wu,Xiao Wu,Xiao yan Xiang,Jinqing Lin
Nitrogen doping serves as a viable strategy to improve the activity of heterogeneous Fenton-like catalysts, whereas the practical deployment of Fenton-like technology is restricted by the complexity of nitrogen-doping procedures. Herein, a in-situ nitrogen-doped Fenton-like catalyst was synthesized through calcination from an in-situ iron-incorporated hyper-cross-linked polymer, where aniline functions as both carbon and nitrogen source while FeCl3 serves dual roles as catalyst for the polymerization and iron precursor. The resulting α-Fe2O3/N-CHCP materials were systematically evaluated for methylene blue (MB) degradation via heterogeneous Fenton-like reactions. Comprehensive characterization demonstrates that nitrogen doping effectively modulates the electronic structure of the carbon matrix, facilitating enhanced charge transfer kinetics and promoting efficient ≡Fe3+/≡Fe2+ cycling for superior H2O2 activation. The optimized α-Fe2O3/N-CHCP-2 catalyst exhibits exceptional catalytic performance, achieving complete removal of MB (100 mg L−1) within 15 min under neutral conditions (pH 7.3) with a high apparent rate constant (kobs) of 0.4732 min−1 significantly surpassing the N-free α-Fe2O3/CHCP catalyst (kobs = 0.0159 min−1). The α-Fe2O3/N-CHCP-2 catalytic system also demonstrates remarkable operational flexibility, maintaining high efficiency across a broad pH range (3-10) and in the presence of some common inorganic coexisting ions. Mechanistic investigations, supported by quenching experiments and EPR spectroscopy, reveal that hydroxyl radicals (•OH) are the predominant reactive species, whereas superoxide radicals (•O2−) contribute secondarily to the degradation process. This work establishes an effective synthetic approach for constructing advanced in-situ N-doping and metal-nitrogen-carbon coordination systems with optimized interfacial electron transfer properties, offering promising applications in advanced oxidation processes for wastewater remediation.
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FUEL
·
2022
·
IF 8.035
Xin Zhang,Yiming Zhao,Wenjuan Li,Yun Zhang,Siyu Xu,Sen Xu,Wen Zhou,Yizheng Fu,Yongan Feng,Weiguo Cao
Higher fatty alcohols play a vital position in modern industry, while the dust explosion hazard cannot be ignored. Three kinds of linear monohydric alcohols CH 3 (CH 2 ) n-1 OH (n = 16, 18, 22) were selected to explore the combustion characteristics through ignition tests and molecular dynamics simulations. The experiment consequences indicated that the flame propagation height of alcohols dust gradually aggrandized as the enlargement of dust concentration of 30–750 g/m 3 and the flame propagation velocity presented two peaks. CH 3 (CH 2 ) 15 OH had the highest flame propagation height and velocity, followed by CH 3 (CH 2 ) 17 OH and CH 3 (CH 2 ) 21 OH. The first flame propagation velocities of CH 3 (CH 2 ) 15 OH, CH 3 (CH 2 ) 17 OH, and CH 3 (CH 2 ) 21 OH reached the maximum value at 500 g/m 3 , which were 16.47, 13.25, and 12.53 m/s, respectively. The second peak reached the maximum value at 750 g/m 3 , which were 20.07, 19.05, and 18.23 m/s, respectively. The combustion reactions of alcohols revealed that the decomposition of molecules was first due to the breakage of the C C bond, and the main products were mainly C 2 H 4 , H 2 O, CH 2 O, CO, and CO 2 . The production and consumption reaction processes of C 2 H 4 , CH 2 O, and other combustible gas products reasonably explained the flame continuous process and the variation of flame propagation. The TG test results indicated that the volatility and thermal conductivity of CH 3 (CH 2 ) 15 OH, CH 3 (CH 2 ) 17 OH, and CH 3 (CH 2 ) 21 OH decreased sequentially, which confirmed the flame propagation and molecular dynamics combustion reactions of the three alcohols. The volatility of alcohols was the key factor determining the difference in the flame propagation behavior of alcohols dust.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 5
·1-12
·
IF 2.8
Wang Ze-Hong,Jia Yun-Ning,Wu Xiang-Feng,Song Meng-Chen,Ma Xiao-Ye,Wang Hui,Zhang Xue-Feng
Semiconductor photocatalysis is a promising method to solve the problem of antibiotic pollution in water. A series of Bi 2 SiO 5 /BiVO 4 composite photocatalysts for tetracycline and levofloxacin degradation are prepared by a two-step hydrothermal method. Analysis results show that the as-prepared Bi 2 SiO 5 /BiVO 4 (2:3) hybrid exhibits better photocatalytic activity than pure samples under visible light illumination. The photocatalytic degradation efficiency of the as-prepared composite shows the maximum of 72.2% within 120 min for tetracycline, which is higher than 43.5% of pure Bi 2 SiO 5 and 67.2% of pure BiVO 4 , respectively. Furthermore, it is 80.3% within 120 min for levofloxacin, which is higher than 7.6% of pure Bi 2 SiO 5 and 69.7% of pure BiVO 4 , respectively. The formation of n–n isotype heterojunction at the interface of Bi 2 SiO 5 and BiVO 4 in the as-prepared composites causes to the improvement of the transport rate and separation efficiency of the photogenerated electron and hole pairs. In addition, the holes play a dominant role in the photocatalytic degradation process. This work will provide a reference for the study of visible light driven photocatalysts to solve antibiotics pollution in water.
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APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Wenfei Zhang,Qulan Zhou,Na Li,Mingtao Li
The synthesis of photocatalysts with good activity and strong product selectivity is of strategic importance for photocatalytic reduction of carbon dioxide (CO 2 ). In this study, an improved sol-gel method was employed for the synthesis of N-doped TiO 2 , Eu-doped TiO 2 , and N, Eu co-doped TiO 2 photocatalysts. The phase structures, optical and electrical properties of the catalysts were thoroughly investigated by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller Surface area analysis, Ultraviolet-visible diffuse reflectance spectroscopy, Photoluminescence spectroscopy, and electrochemical measurements. The experimental results of photocatalytic CO 2 reduction indicated that both N and Eu doping could effectively improve the photoresponse of TiO 2 , but the synergistic effect of N and Eu made the N, Eu co-doped TiO 2 exhibit superior photocatalytic activity and product selectivity, the formation rate of methane (CH 4 ) by photocatalytic reduction of CO 2 using N-Eu/TiO 2 as the catalyst could reach 13.48 μmol·g cat −1 ·h −1 , which was about 12 times higher than that of pure TiO 2 , and the selectivity reached nearly 100%. Finally, this synergistic effect was explained using DFT calculation and in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and the possible mechanism of photocatalytic CO 2 reduction over N-Eu/TiO 2 was elucidated.
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Soft Matter
·
2022
·Vol. 18
·期 32
·6115-6123
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IF 4.046
Ling Wang,Shengjie Liu,Jingjing Cheng,Yao Peng,Fangfei Meng,Zhaoqiang Wu,Hong Chen
Flexible strain sensors have been extensively studied for their potential value in monitoring human activity and health. However, it is still challenging to develop multifunctional flexible strain sensors with simultaneously high transparency, strong self-adhesion, fast self-healing and excellent tensile properties. In this study, we used N,N-dimethylacrylamide (DMA) in the imidazolium-based ionic liquid 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl] imide ([BMIM][Tf2N]) for “one-step” UV irradiation. A poly(N,N-dimethyl)acrylamide (PDMA) ion-conductive gel was prepared by site polymerization. Based on the good compatibility between PDMA and ionic liquid, the prepared ion-conductive gel has good transparency (∼90%), excellent stretchability (1080%), strong self-adhesion (67.57 kPa), fast self-healing (2 s at room temperature) and great antibacterial activity (∼99% bacterial killing efficiency). Moreover, the strain sensor based on the PDMA ion-conductive gel has good electromechanical performance and can detect different human motions. Based on the simple and easy-to-operate preparation method and the endowed multifunctionality of the PDMA ion-conductive gel, it has broad application prospects in the field of flexible electronic devices.
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RSC Advances
·
2022
·Vol. 12
·期 24
·15354-15360
·
IF 4.036
Jinghua Liu,Xiong He,Fei Guo,Baosheng Liu,Zijun Sun,Li Zhang,Haixin Chang
Owing to the wide negative potential window (∼1.2 V) along with high specific capacitance (1340 F g−1) in alkaline electrolyte, vanadium nitride (VN) has been served as promising negative supercapacitor electrode material. However, VN is easy to dissolve during cycling process and shows low capacitance retainability. Herein, a hybrid electrode (marked as VN/NCNT/NCN), featuring VN nanoparticles and N-doped carbon nanotube inserted in N-doped carbon nanosheets, has been fabricated with a facile C3N4 self-sacrificing method. The porous structure and high conductive carbon skeleton, as well as the uniform distribution of VN nanoparticles give VN/NCNT/NCN a great amount of active site and fulfill excellent electrochemical performance for VN/NCNT/NCN-based electrode. The as-fabricated hybrid electrode exhibits a maximum specific capacitance of 232.9 F g−1 at 1 A g−1. Moreover, the cycling performance has been greatly improved and the specific capacitance remains 91% after 5000 cycles.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 7
·1753-1761
·
IF 3.146
Wei Zuojun,Cheng Yuran,Chen Mengting,Ye Yuhua,Liu Yingxin
Using nitrogen-doped mesoporous carbon (NMC) as the support, several NiRe bimetallic catalysts with low metal loading of 1 wt% were designed and prepared for the selective deoxygenation of oleic acid to n-heptadecane in the absence of hydrogen. Results showed that the Ni 80 Re 20 /NMC catalyst with a Ni/Re molar ratio of 80: 20 achieved the highest yield of n-heptadecane (92.3%) at 330 °C for 2 h in isopropanol solvent, and at a metal/oleic acid weight ratio of 1: 333. The catalyst can be reused at least five times with slight activity loss. Combined with the results of in-situ XRD, HRTEM, XPS and CO 2 -TPD, the formation of NiRe alloy, the very fine NiRe nanoparticle size at 2.30 nm, as well as the hydrophobic, mesoporous and weakly basic properties of the NMC support surface were demonstrated to contribute to the excellent catalytic performance of the catalyst.
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Journal of Cleaner Production
·
2023
·
IF 11.1
Zeying Yang,Boyong Cao,Yi Cao,Xiaowei An,Xiyan Yue,Guoqing Guan,Yanhao Zhang,Baoxian Ye,Zhengkun Xie
Emerging contaminant N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine has caused severe threats to ecosystems, necessitating the development of highly sensitive detection methods. Herein, a reliable and ultra-sensitive electrochemical sensor based on a carbon paste electrode modified by hexagonal wurtzite zinc oxide was developed for selective determination and degradation of N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine. Experimental results demonstrated the successful application of the sensor for detecting N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine in soil samples. The contaminant contents were found to be 1.46–24.68 nmol L −1 in Zhengzhou City and 1.99–11.3 nmol L −1 in Pingdingshan City, respectively, along with a satisfactory recovery rate. Density functional theory calculations revealed that the hexagonal wurtzite zinc oxide crystal significantly decreased the activation energy of catalytic conversion compared to cubic sphalerite , resulting in a notable improvement in sensor response. Cryogenic electron microscopy technique further confirmed that the electrocatalytic degradation product of N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine was not toxic N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine quinone . Under optimal analysis conditions, the sensor achieved widely low as well as high linear ranges (0.1–800 nmol L −1 and 0.9–20 μmol L −1 ) with a low detection limitation (33 pmol L −1 ), indicating that such a highly sensitive and cost-effective electrochemical sensor has the potential for environmental pollutants monitoring .
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