JOURNAL OF CHEMICAL RESEARCH
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2018
·
IF 0.668
Xiaoyun Ma,Daqin He,Zhengjian Chen
A simple method for the preparation of nitriles in moderate to good yield has been achieved by treatment of aromatic and heterocyclic aldoximes with malononitrile in water at reflux in the presence of copper acetate as catalyst. Arylaldoximes with an electron-donating group showed the highest reactivity, their conversion being achievable at room temperature.
研究领域:
有机化学
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合成化学
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DOI
高影响因子
MOLECULES
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2017
·Vol. 22
·期 1
·150
·
IF 2.861
Dongjun Lv,Mingjie Zhang
Two polymer catalysts (Pd-OCMCS and Ni-OCMCS) with good reusability were synthesized by coordinating Pd and Ni ontoO-carboxymethyl chitosan (OCMCS). The chemical structure and thermal stability of prepared catalysts were determined by Fourier transform infrared (FT-IR) spectra, Energy Dispersive Spectrometer (EDS)analysis, X-ray diffraction (XRD), and thermogravimetric analyzer (TG-DTG), and the analysis results showed that the Pd and Ni ions coordinated onto the OCMCS and formed a ligand with the –COOH group, amino groups, and –OH group on the OCMCS, and the EDS and Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) analysis results showed that the loading amounts of Pd and Ni were approximately 8.3% and 8.9%, respectively. In the Heck reaction between aryl halides andn-butyl acrylate catalyzed by the prepared catalyst, the test results showed that the product yield followed the order of aryl iodide > aryl bromide > aryl chloride. Additionally, the product yield for the aryl iodide and aryl bromide could reach up to 99% and 96%, respectively. Moreover, the electron-withdrawing and electron-donating property of the group on the aryl also affected the product yield, and the product yield for aryl halides with electron-withdrawing groupp-NO2,p-CH3CO, andp-CHO was higher than that with electron-donating groupp-CH3.Keywords:O-carboxymethyl chitosan;biopolymer-supported catalyst;Pd-OCMCS;Ni-OCMCS;heck reaction
研究领域:
材料科学
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催化
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有机化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL PAPERS
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2017
·Vol. 71
·期 9
·1579-1586
·
IF 1.258
Chen Mei-Hang,Lu Dao-Wang,Zhang Xun,Zhou Zeng-Yan,Wang Xiao-Bin,Shu Hua
A series of novel coumarin substituted amide derivatives were synthesized and evaluated for their antibacterial activities. Result indicated that compounds 3f , 3g , 3h , 3i , 3j , 3k , 3l , 3m , 3n , 3o and 3q exhibited excellent antibacterial activities against Xanthomonas oryzae pv. oryzae ( Xoo ) and Xanthomonas citri subsp. Citri ( Xcc ) in vitro, which were better than those of commercial agricultural antibacterial thiodiazole-copper. The title compounds with electron-withdrawing group showed better antibacterial activities than those of compounds with electron-donating group, and the title compounds bearing the same substituent group exhibited better antibacterial activities against Xcc than antibacterial activities against Xoo .
研究领域:
有机化学
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药物化学
·
植物病理学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Qingxiang Xu,Long Zhao,Yuhan Ma,Rui Yuan,Maosong Liu,Zhaoli Xue,Henan Li,Jianming Zhang,Xinping Qiu
Charge states at the catalytic interface can intensely alter the charge transfer mechanism and thus the oxygen reduction performance. Two symmetric cobalt porphyrins with electron deficient 2,1,3-benzothiadiazole (BTD) and electron-donating propeller-like triphenylamine (TPA) derivatives have been designed firstly, to rationally generate intramolecular partial charges, and secondly, to utilize the more exposed molecular orbitals on TPA for enhancing the charge transfer kinetics. The catalytic performance of the two electrocatalysts was examined for oxygen reduction reactions (ORR) in acidic electrolyte. It was found that BCP1/C with two BTD groups showed greater reduction potential but less limiting current density as compared to BCP2/C bearing BTD-TPA units. The reduced potential of BCP2/C was proposed to the introduction of the electron-donating ability of TPA, which may decrease the adsorption affinity of oxygen to the cobalt center. Both dipole-induced partial charge effect and the more exposed cation orbitals of the 3D structural TPA were proposed to contribute to the increased response current of BCP2/C . In addition, BCP2/C attained more than 80% of H 2 O 2 generation in acidic solution, which may also relate to the structural effect. These findings may provide new insight into the structural design of organic electrocatalysts and deep understanding on the interfacial charge transfer mechanism for ORR.
研究领域:
电化学
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催化
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SYNTHETIC METALS
·
2014
·
IF 2.222
Fang Liao,Siwei Yang,Xiubing Li,Lijun Yang,Zhihui Xie,Chenshu Hu,Shuai Yan,Tongyan Ren,Zhiduo Liu
Tunable fluorescent nanomaterials are of great significance. In this paper, the poly(o-phenylenediamine) (PoPD) nanospheres were synthesized via chemical oxidation polymerization of o-phenylenediamine (oPD) monomers by (NH 4 ) 2 S 2 O 8 (APS) at room temperature. It is interesting that when this fluorescent nanosphere was doped by F, S and Se via a simple hydrothermal progress, the fluorescence spectrum remarkably changed. The emission peak of F-doped and S-doped PoPD nanosphere was at 411 nm and 530 nm, the spectrum blue shift can be attributed to the electron-withdrawing effect of F and S. On the other side, the emission peak of Se-doped PoPD nanospheres were at 594 nm and can be attributed to the electronic donor effect of Se. These nanomaterials can be used as ultra-sensitive fluorescent detection system (ppb level) for Cu 2+ , Ca 2+ , Hg 2+ and H 2 O 2 . The tunable spectrum and sensing performance of this system is interesting and significant.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
荧光光谱
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Jie Chen,Jinfeng Ling,Bo Sun,Jian Wang,Baoxue Zhou,Xiaohong Guan,Yuankui Sun
Bisulfite-activated permanganate (PM/BS) process has proven to be a promising method for trace organic contaminants (TrOCs) abatement. However, to our knowledge, most previous studies on PM/BS process were limited in synthetic water at lab-scale. Hence, the performance of TrOCs abatement by PM/BS process was investigated in real waters in this study, and for the first time, its feasibility as a pretreatment process was evaluated at pilot-scale. The lab-scale results indicated that almost all tested TrOCs could be completely removed from pure water, while their removal efficiencies varied widely from ∼20 % to ∼90 % in real waters. Correlation analysis suggested that TrOCs abatement decreased linearly with increasing concentration of dissolved organic matter (DOM) and halide ions in real waters. The TrOCs with electron-donating groups were more likely to be decomposed in PM/BS process. The PM/BS pretreatment produced MnO 2 and decreased the aromatic signal of the DOM, which enhanced the removal of DOM during subsequent coagulation-sedimentation processes. Comparing with ozonation, chlorination, and permanganate processes, PM/BS process showed some advantages in terms of TrOCs abatement and operating costs. Furthermore, the pilot-scale experiment confirmed that PM/BS process combined with traditional water treatment processes could achieve excellent TrOCs abatement (greater than 84%).
研究领域:
环境工程
·
水处理技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）