ORGANIC & BIOMOLECULAR CHEMISTRY
·
2025
·
IF 2.7
Fei Yuan,Yiyuan Xin,Caifeng Yuan,Zhuo Chen,Tongling Qin,Wenxia Hu,Jiahuan Duan,E Tang
A simple, exogenous-base-free, and NBS-mediated C-selenocyanation/cyclization reaction of enaminones with KSeCN under mild conditions, providing a facile route to 2-aminoselenazole products, has been developed. This efficient protocol is postulated to first undergo the NBS-oxidated polarity reversal of the reactive SeCN- anion to form N-selenocyanosuccinimide as an electrophilic selenium source, which can induce the C-selenocyanation of enaminones and enamino esters, followed by a nucleophilic cyclization promoted by in-situ yielded HBr.
研究领域:
有机化学
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合成化学
·
硒化学
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DOI
PubMed
高影响因子
PHYSICAL REVIEW B
·
2026
·Vol. 113
·期 10
·104506
·
IF 3.9
Junkun Yi,Lihong Hu,Menghu Zhou,Binbin Ruan,Yadong Gu,Qingsong Liu,Shunli Ni,Lewei Chen,Jihai Yuan,Yunqing Shi,Haoyu He,Mingwei Ma,Fanming Qu,Guangtong Liu,Zhi-An Ren
Here, the authors report the crystal and electronic structures, and superconductivity of $h$-NbS single crystals with site-selective Nb vacancies. This compound has a noncentrosymmetric lattice structure and exhibits Nb vacancy dependent electronic structure. $h$-NbS is a two-gap $s+s$-wave superconductor with a moderate coupling strength. The broken inversion symmetry leads to a Pauli limit violation in this three-dimensional superconductor with very low anisotropy. These findings highlight the interplay between crystal symmetry, dimensionality, stoichiometry, and superconductivity in transition metal chalcogenide superconductors.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Qinghua Chen,Mengmeng Zhang,Jingying Li,Guodong Zhang,Yanjun Xin,Chao Chai
Strong absorption in a wide wavelength range and effective charge separation are main factors for improving photocatalytic activity of semiconductor photocatalysts. Herein, immobilized zero-dimensional/one-dimensional (0D/1D) Au/CuS/CdS/TiO 2 nanobelts (Au/CuS/CdS/TiO 2 NBs) heterostructure photocatalyst with innovative morphology and appropriate band-gap configuration was synthesized for the first time. For this construction, TiO 2 NBs provide the 1D structure for a large superficial area and fast electron mobility, 0D CdS and CuS nanoparticles are the visible-light responsive nanomaterials, and Au nanoparticles serve as the surface plasmon resonance effect and electron transfer. The Au/CuS/CdS/TiO 2 NBs showed improved photocatalytic performance towards moxifloxacin (MOX) degradation, which can be attributed to the promoted photoabsorption contribution and enhanced separation and transfer of photoexcited electrons and holes. The morphology, constitution, optical and electrochemical properties of the prepared photocatalyst were investigated comprehensively. Moreover, the photocatalytic degradation mechanism and degradation by-products of moxifloxacin were studied. Results showed that the OH, O 2 − and h + are the main chemical oxidation species responsible for the degradation of MOX. Eight different photocatalytic degradation products were detected. The stability assessment showed that photodissolution plays the primary role in the photocatalytic performance decrease of Au/CuS/CdS/TiO 2 NBs. This work gives a promising strategy to rational design efficient hybrid metal-semiconductor photocatalysts for solar energy conversion.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Yunhao Li,Shuhao Wang,Xiaoxiao Song,Yong Zhou,Hongmei Shen,Xingzhong Cao,Peng Zhang,Congjie Gao
The removal of small and neutral boron molecules from seawater remains a critical challenge in energy-saving and low-cost desalination. In this paper, a high boron removal reverse osmosis (RO) membrane was designed by embedding sulfonyl moleculars in the polyamide (PA) network. The swelling PA structure has enlarged free volumes. It would induce more facile penetration of 4-nitrobenzenesulfonyl chloride (NBS). Evaporation of solvent molecules contracts the PA network and leads to the fixation of the NBS molecules into the PA network. The swelling of the polyamide network was studied systematically. The most suitable swelling solvent was selected based on the solubility parameter and the restoration capability. The “swelling-embedding-shrinking (SES)” strategy reconstruct the free volume of PA chains. It resulted in significantly higher rejection of neutral boron molecules due to enhanced steric hindrance by embedded NBS plugs and synergistic exclusion effect by –SO 3 H groups. Meanwhile, the alteration of membrane composition and structure were kept minimal. Further, the impacts of key determining factors (polarity, steric hindrance, and affinity) on boron separation performance were systematically analyzed by boron-containing compounds with different numbers of hydrogen bonding sites (or dipole moments) or molecular volumes. Under simulated seawater conditions, the boron rejection of the SES modified reverse osmosis membranes increased from 82.12% to 93.10%, and the salt rejection rate increased to 99.57%. Our study shows that the swelling induced embedding of NBS molecules can be readily adopted to regulate the permselectivity of the PA layer towards removal of boron species.
研究领域:
材料科学
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化学工程
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环境科学
·
海水淡化技术
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2024
·
IF 2.6
Rong Ai,Fatima-Ezzahra Ettoumi,Yueran Ma,Dong Li,Weide Lv,Zisheng Luo
Summary The integration of carbon dioxide-nanobubbles (CO 2 -NBs) with cellulase has led to the development of an innovative extraction system for phenolic compound retrieval from P. cyrtonema (Polygonatum cyrtonema) Hua rhizomes. Four critical factors influencing on CO 2 -NBs-cellulase were methodically investigated and optimised through single-factor experiments. The optimal experimental conditions are 30 cycles, 0.35 MPa, pH 5.45 and 0.025 g/mL cellulase aqueous solution. The stability of system was characterised meticulously, indicating the viability for at least 24 h. Comparative assessment of bioactive constituents and antioxidant activity demonstrated exceptional extraction efficiency and potential synergistic effects of CO 2 -NBs-cellulase. Synergistic effects and reaction mechanisms during extraction were explored using Fourier-transform infrared spectroscopy, differential scanning calorimetry and scanning electron microscopy, which contributed to mechanism understanding with significant alterations in partial structure and heightened thermal stability we found. In essence, this study introduces an eco-friendly, energy-efficient extraction system paradigm based on a novel nanobubble-enzyme binding approach.
研究领域:
生物技术
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药学
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食品科学
·
环境科学
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DOI
高影响因子
Future Foods
·
2025
·
IF 8.2
Jiaojiao Liang,Xinyu Shen,Ziyou Liu,Yixin Hu,Hui Xu,Zimeng Yang,Fei Xie,Jinping Cao,Yue Wang,Chongde Sun
In this study, air nanobubbles (NBs) generated with a new device were stabilised by a complex of arabic gum (AG) and stevioside (STE). Some basic metrics of NBs produced by biosurfactants at different concentrations were characterized to determine the stability of NBs. The mixture solution rich in NBs was assisted by ultrasonic disruption (UD) to extract total phenols (TP) and total flavonoids (TF) from 7 citrus pericarp. We evaluated four key factors affecting the TF extraction of ‘ Citrus reticulata 'Chachiensis '’ (‘Chazhigan’) pericarp by one-way test. The optimal extraction conditions were further predicted and validated by Box-Behnken response surface experiments. Under the conditions of 135 w capacity, 4.1 C mixture solution concentration, 30.5°C water bath temperature, and 31min ultrasonic time, the TF content of ‘Chazhigan’ pericarp (20.82±0.85 mg/g DW) was significantly better than that extracted by 80% ethanol (12.22±0.90 mg/g DW). Finally, fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were utilised to provide a preliminary exploration of the potential mechanisms involved in the extraction process. The flavonoid extracts from the pericarp of ‘Chazhigan’ were qualitatively analysed. And the differences in the chemical antioxidant activity of their extracts were investigated before and after the application of traditional alcoholic extraction and novel green extraction. In conclusion, this study established a novel approach that is eco-friendly, which could effectively extract flavonoids from citrus peels.
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产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
·
2022
·Vol. 26
·期 2
·e202201275
·
IF 3.261
Cai-Yan Zhang,Ke Cao,Han-Bo Yang,Linhai Jiang,Bo Li,Junxiao Yang
The Cu(OTf) 2 /NBS promoted cyclization of 1-cinnamyl alcohol- o -carboranes for synthesis of o -carborane substituted oxetanes has been developed. A series of substituted oxetanes has been synthesized with moderate to good yields, which would be an important synthon for design novel reactions in oxetane chemistry as well as carborane chemistry. Graphical Cu(OTf) 2 /NBS promoted cyclization of 1-cinnamyl alcohol- o -carboranes offers a novel synthon of o -carborane substituted oxetane.
研究领域:
有机化学
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硼化学
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药物化学
·
合成方法学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Chong Xu,Jie Zhang,Xing Qian,Weimin Wu,Jiahui Yang,Linxi Hou
Due to the unique features including well-defined void space and high surface-to-volume ratio, non-noble metal catalysts with hollow structures have received intensive researches in dye-sensitized solar cells (DSSCs) and electrochemical water splitting. Herein, we prepare a series of cobalt-incorporated molybdenum sulfide hollow nanoboxes (denoted as Co-MoS x NBs) via a one-step fleet template conversion from cube-shaped Co-based zeolitic imidazolate framework-67 which precipitated without prolonged aged process. During above transformation, it is notable that the surface morphologies of nanobox can be effectively tailored by the proportion of MoS 4 2− . The as-obtained Co-MoS x NBs with well-defined boxed structure and the appropriate doped ratio are developed as bifunctional catalysts for accelerating both reduction of I 3 − in DSSCs and hydrogen evolution reaction (HER). As expected, a high power conversion efficiency (9.64%) is achieved by Co-MoS x -1/3 NBs based DSSC under AM 1.5G irradiation, which is much preceded to that of Pt (8.39%). Meanwhile, the practical utilization of Co-MoS x -1/3 NBs for HER yields a low onset overpotential (35 mV) and a small Tafel slope (61.4 mV decade −1 ) in alkaline medium.
研究领域:
材料科学
·
电化学
·
太阳能
·
纳米技术
·
催化
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DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2022
·
IF 4.198
Cai-Yan Zhang,Ke Cao,Han-Bo Yang,Li-Fang Ding,Junxiao Yang
The Cu(OTf)2/NBS-mediated tandem reaction of 1-cinnamyl alcohol-o-carboranes for the synthesis of C-alkenyl-o-carboranes has been developed. Mechanism studies demonstrated that the Cu(OTf)2-promoted ring opening of oxetane with electron-rich arenes as soft nucleophiles was involved and was the key step for the transformation. This work provided an alternative strategy for the synthesis of C-alkenyl-o-carboranes, which has an important reference for the synthesis of o-carborane derivatives with diversity.
研究领域:
有机化学
·
硼化学
·
合成方法学
·
碳硼烷化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）