JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2014
·
IF 2.871
Ying Zhao,Rui Zhang,Yiwei Xu,Honglan Qi,Xinbing Chen,Chengxiao Zhang
Benzoxazole derivatives, an important type of heterocyclic compounds, have attracted significant interest in photonics and electronics since they are highly efficient luminophores with high photo-stability. The electrochemistry and electrogenerated chemiluminescence (ECL) of benzoxazole derivatives were reported and the substituent effects on the electrochemical and ECL properties of benzoxazole derivatives were investigated in an acetonitrile:benzene (v:v = 1:1) solvent for the first time. The studied derivatives contain a 2-biphenyl benzoxazole moiety with the substituents (–CH 3 , –Cl, and –NO 2 groups) at the 5-position of the benzoxazole ring and the alkoxy chains (C n H 2 n +1 , n = 2–10) at the 4′-position of the biphenyl ring. The electrochemical and ECL behavior of benzoxazole derivatives were found to be dependent on the nature of the substituents at the 5-position of the benzoxazole ring but independent on the alkoxy chain length at 4′-position of biphenyl moiety. Under ion annihilation conditions, 5B–H (2-(4′-pentyloxy-biphenyl-4-yl)-benzoxazole), 5B–Me (2-(4′-pentyloxy- biphenyl-4-yl)-5-methylbenzoxazole), and 5B–Cl (2-(4′-pentyloxy-biphenyl-4-yl)-5-chlorobenzoxazole), display high ECL blue emission (ECL efficiencies are 0.51, 0.54, and 0.78 for 5B–H, 5B–Me, and 5B–Cl, respectively), while 5B-NO 2 (2-(4′-pentyloxy-biphenyl-4-yl)-5-nitrobenzoxazole) does low ECL emission. In the presence of benzoyl peroxide, four derivatives exhibit strong ECL blue emissions. The results provide important electrochemical and ECL information of benzoxazole derivatives as well as their structure–properties relationships for future research.
研究领域:
电化学
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光电子材料
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分析化学
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DOI
高影响因子
MINERALS ENGINEERING
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2018
·
IF 2.707
Wencui Chai,Yanfang Huang,Weijun Peng,Guihong Han,Yijun Cao,Jiongtian Liu
The existence of sulfide minerals (mainly pyrite) limits the use of high-sulfur bauxite in the production of Bayer alumina. In this work, the reverse flotation desulfurization using 2-mercaptobenzimidazole (MBI) as the collector was studied by L 9 (3 4 ) orthogonal tests. The interaction mechanisms of MBI with pyrite were investigated by advanced analysis technologies including scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), contact angle testing and zeta potential analysis. Results indicate that the sulfur content of bauxite is decreased from 2.87% to 0.26% by one roughing and one cleaning flotation under the optimized conditions of collector dosage of 100 g/t, activator dosage of 60 g/t, frother dosage of 200 g/t and pulp pH at 3. MBI exhibits superior hydrophobic behavior on the pyrite surface under the acid solution than under the alkaline solution, which favors the flotation of pyrite under the acidic condition. The zeta potential, FTIR and XPS results reveal that the interaction mechanisms of MBI with pyrite are electrostatic forces and chelation by forming N Fe S coordination bonds. MBI is an efficient collector of pyrite in the flotation desulfurization of high-sulfur bauxite and is expected to be used in other oxide or sulfide ores to separate pyrite.
研究领域:
矿物加工工程
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冶金工程
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表面化学
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资源综合利用
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浮选化学
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
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2016
·Vol. 23
·期 5
·1-8
·
IF 1.969
Yang Xiao,Duan Lian,Cheng Xinjian,Ran Xiaoqi
Effect of polydopamine coating on improving photostability of poly(1,3,4-oxadiazole)s (POD) fiber was studied in detail. Due to strong adhesion ability of polydopamine, the POD fiber could be coated easily by dopamine in Tris–HCl ( pH = 8.5) solution at room temperature with exist of oxygen. The polydopamine coating was characterized by SEM, XPS and ATR-FTIR. It was proved by UV-spectra analysis that the polydopamine coating had a strong absorbance in ultraviolet wavelength and was very stable to ultraviolet. Additionally, it was found by pyrogallol autoxidation method that the polydopamine could efficiently capture superoxide anion radical, which was an important factor that resulted in photodegradation of POD fiber, due to its catechol structure. These two findings implied that polydopamine coating was a potential photoprotection agent. Finally, compared to POD fiber, the tensile test of POD fiber coated by polydopamine further proved that the polydopamine did improve the photostability of POD fiber. And the FTIR analysis of POD coated by polydopamine also confirmed that there was almost no macromolecular change after UV exposure.
研究领域:
高分子材料科学
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功能纤维
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光化学稳定性
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表面工程
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复合材料
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DOI
高影响因子
JOURNAL OF CHEMICAL SCIENCES
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2017
·Vol. 129
·期 3
·289-294
·
IF 1.235
LIU YAOWEN,ZHAO FEN,ZHOU HAOHUA,XIE KAI,JIANG YUBO
CuI-catalyzed selective Ullmann C–O coupling of 1,4-disubstituted 1,2,3-triazole bromides with phenols were achieved through the coordination of N(2) atom. The ortho C–Br bond in N(1) aryl can be selectively coupled with phenols, while other C–Br bonds remain inert, generating ortho aryloxyl 1,4-diaryl 1,2,3-triazoles.
CuI-catalyzed selective Ullmann C–O couplings of 1,4-disubstituted 1,2,3-triazole bromides with phenols were achieved through the coordination of N(2) atom in triazole. The ortho C-Br bond in N(1) of aryl can be selectively coupled with phenols, while other C-Br bonds remain inert, generating ortho -aryloxyl 1,4-diaryl 1,2,3-triazoles.
研究领域:
有机化学
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药物化学
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生物有机化学
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催化化学
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合成方法学
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DOI
高影响因子
JOURNAL OF CHEMICAL SCIENCES
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2020
·Vol. 132
·期 1
·1-7
·
IF 1.406
DU ZHONGLIN,LI FENRUI,LI LI,LI RAN
Abstract Microwave-assisted one-pot quick synthesis to 1-monosubstituted 1,2,3-triazoles was achieved with good to excellent yields using the widely available arylboronic acids, sodium azide and 3-butyn-2-ols within 15 min. This method features high efficient and facile as organic azides, acetylene gas and harsh conditions were avoided. Graphic abstract Microwave-assisted one-pot quick synthesis to 1-monosubstituted 1,2,3-triazoles was achieved with good to excellent yields using the widely available arylboronic acids, sodium azide and 3-butyn-2-ols within 15 min.
研究领域:
有机化学
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药物化学
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合成方法学
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绿色化学
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杂环化学
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DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2022
·
IF 1.73
Shuo Yan,Haibin Yu,Zan Chen
Membranes with both good permeation and selectivity are highly desired for gas separations. In this study, we synthesized a new 6FDA-type polyimide copolymer 6FDA-BDTA-ODA, and then an organic polymer of poly (N-vinylimidazole) was doped into the polyimide to prepare mixed matrix membranes (MMMs). We also studied the effect of poly (N-vinylimidazole) contents on the separation performance of MMMs. The results showed that the ideal selectivity for CO2/CH4 was improved by adding the poly (N-vinylimidazole) filler. The ideal selectivity reached 63.5 with 6 wt% poly (N-vinylimidazole) loading with the permeability of 29.2 Barrer. The highly permeable MMMs showed a considerably enhanced performance for CO2/CH4 that close to the 2008 Robeson upper-bound. The gas separation performance of the prepared MMMs for CO2/CH4 was improved compared to that of the pure polymer membrane, indicating that the copolyimide/poly (N-vinylimidazole) MMMs have promising applications in CO2/CH4 gas separation.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Materials Today Communications
·
2019
·
IF 1.859
Wei Jin,Lushan Wang,Hao Zhang,Jun Liang,Shixiong Cao,Qi Zhang,Jianli Wang,Zhibin Ye
We demonstrate the successful synthesis of a novel crosslinkable polyaryletherketone, SCBI-PAEK-6F, which has pendant benzimidazole groups as a tunable content. With the strategic incorporation of benzimidazole groups, the SCBI-PAEK-6F membranes prepared by non-solvent induced phase separation (NIPS) method became cross-linkable. Then the solvent-resistance of ultrafiltration membranes was improved through cross-linking. The structures and performances of the membranes, along with the effects of the post cross-linking, had been systematically investigated. The solvent-resistance test confirmed that the membrane stability in representative polar aprotic solvents had been pronouncedly enhanced after cross-linking. Cross-linked membranes had high gel contents of about 80% after soaking in the solvents for 7 days. Pore size and porosity analysis had shown that the mean pore size and porosity of SCBI-PAEK-6F membranes became larger after the cross-linking process. Meanwhile, the cross-linked membranes showed the improved ultrafiltration performance, the cross-linked membranes had pure water flux which is 50% bigger than the pristine membranes. In addition, all membranes showed superior bovine serum albumin rejection (over 98%), but the antifouling property of membranes became a little worse after the cross-linking process.
研究领域:
高分子材料
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膜科学与技术
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化学工程
·
分离科学
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DOI
高影响因子
TRANSITION METAL CHEMISTRY
·
2017
·Vol. 42
·期 4
·273-283
·
IF 1.358
Fang Dong-Lin,Mo Shao-Yin,Wu Kai-Fei,Huang Zhong-Jing
Three coordination polymers have been obtained by hydrothermal synthesis, namely [Zn(imip)(H 2 O) 2 ]·0.5H 2 O ( 1 ), [Co(imip)(H 2 O) 2 ]·0.5H 2 O ( 2 ), and [Cd 2 (imip) 2 (H 2 O) 3 ] ( 3 ) [H 2 imip = 5-(1H-imidazol-1-yl) isophthalic acid]. The coordination polymers were characterized by IR spectra, elemental analysis, powder X-ray diffraction, and thermogravimetric analysis. Furthermore, single-crystal X-ray analysis reveals that they have 2D structures, which are extended into 3D networks via O–H···O hydrogen-bonding interactions. The luminescent properties of these coordination polymers were investigated.
研究领域:
无机化学
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配位化学
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晶体工程
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材料化学
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光物理
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2020
·
IF 3.306
Shengling Li,Duanlin Cao,Xianjiao Meng,Zhiyong Hu,Zhichun Li,Changchun Yuan,Tao Zhou,Xinghua Han,Wenbing Ma
In this study, a novel schiff base fluorescent probe (E)- N' -(3-(benzo[d]thiazol-2-yl)-2-hydroxy-5-methylbenzylidene)-7-(diethylamino)-2-oxo-2 H -chromene-3-carbohydrazide ( CHS ) was synthesized for sequential detection of Al 3+ and pyrophosphate ions (PPi) in a DMSO/HEPES (4:1 v/v, pH = 7.4) buffer system and characterized by 1 H NMR, 13 C NMR, ESI-HR-MS and DFT calculation. Its detection limit was determined to be 0.16 μM for Al 3+ and 0.18 μM for PPi in a pH range of 4∼8, respectively. The Job’ s plot showed that the stoichiometric ratio to Al 3+ was 1:1, and CHS -Al 3+ showed highly selective recognition of PPi. The sensor CHS could also recognize Al 3+ and PPi and exhibited fluorescence enhancement and quenching properties in HeLa cells.
研究领域:
分析化学
·
生物分析
·
分子探针
·
细胞成像
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金属离子检测
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DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 41
·14088-14093
·
IF 4.029
Yuangang Xu,Pengcheng Wang,Qiuhan Lin,Ming Lu
A carbon-free inorganic–metal complex [Zn(H2O)4(N5)2]·4H2O was synthesized by the ion metathesis of [Na(H2O)(N5)]·2H2O solution with Zn(NO3)2·6H2O. The complex was well characterized by IR and Raman spectroscopy, elemental analysis (EA), powder X-ray diffraction (PXRD), and differential scanning calorimetry (DSC). The structure of the complex was confirmed by single-crystal X-ray crystallography and a Zn(II) ion is coordinated in a quadrilateral bipyramid environment in which the axial position is formed by two nitrogen atoms (N1) from two pentazolate rings (cyclo-N5−) and the equatorial plane is formed by four oxygen atoms (O1) from four coordinated water molecules. The thermal analysis of [Zn(H2O)4(N5)2]·4H2O reveals that although water plays an important role in stabilizing cyclo-N5−, dehydration does not cause immediate decomposition of the anion. However, cyclo-N5− decomposed into N3− and N2 gas at 107.9 °C (onset). Based on its chemical compatibility and stability, the complex exhibits promising potential as a modern environmentally-friendly energetic material.
研究领域:
化学
·
材料科学
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DOI
高影响因子
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
·
2024
·
IF 1.3
Huang Pengmian,Yang Ting,Liu Jiyong,Xiang Juncheng,Wu Minghui
To discover new bisamide compounds with insecticidal and fungicidal activities, 19 novel cyproflanilide derivatives containing 1,2,4-oxadiazole group were designed and synthesized according to the principle of biologically active factor splicing. Preliminary biological assay data indicated that the majority of target compounds demonstrated significant insecticidal activity against Lepidopteran pests. Meanwhile, compounds 5p and 5q showed 97.22 and 100% lethality against Tetranychus cinnabarinus at 400 mg L-1, which were better than cyproflanilide (41.11% at 400 mg L-1). In addition, it is exciting that we have achieved our initial goals as some of the target compounds exhibited both insecticidal and fungicidal activities. For instance, compounds 5b and 5c showed 59.26 and 74.07% fungicidal activities against Cucumber downy mildew at 400 mg L-1, as well as 100% insecticidal activity against Plutella xylostella and armyworm at 100 mg L-1. Compound 5h showed 100% insecticidal activity against armyworm at 10 mg L-1, and also displayed 66.67% fungicidal activity against Cucumber downy mildew at 400 mg L-1. The inhibition rate of compounds 5l and 5s against Cucumber downy mildew reached 88.89 and 96.30% at 400 mg L-1. This work showed the effectively fungicidal application of 1,2,4-oxadiazole group in bisamide compounds and provides insights for optimal structural design.
研究领域:
农药化学
·
有机合成
·
植物保护
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Feng Su,Peng Yun,Chenglong Li,Rongye Li,Laishun Xi,Yuandou Wang,Yangsheng Chen,Suming Li
A series of poly(2-ethyl-2-oxazoline)-poly(L-lactide) (PEOz-PLA) diblock copolymers were synthesized by ring-opening polymerization of l -lactide using a monohydroxy terminated PEOz-OH macro-initiator in the presence of stannous octoate as catalyst. The resulting diblock copolymers were characterized by 1 H nuclear magnetic resonance and gel permeation chromatography . Self-assembled micelles were prepared using the co-solvent evaporation method in water and in phosphate buffered saline (PBS) at pH 7.4, 6.5 and 5.0. The resulting micelles exhibit different morphologies, such as spherical micelles and worm-like micelles depending on the hydrophilic/hydrophobic balance. Spherical micelles were exclusively observed for PEOz-PLA copolymers with short PLA blocks, whereas co-existence of worm-like and spherical micelles was observed for copolymers with long PLA blocks. The micelle size increases with decreasing pH due to the electrostatic repulsion between PEOz chains resulting from ionization of the tertiary amide groups along PEOz chains. A hydrophobic anti-tumor drug, paclitaxel , was entrapped in PEOz-PLA micelles. High loading efficiency up to 86.7% was obtained for copolymers with long PLA blocks. Drug release was performed in PBS at different pH values. During the 30-day release period, faster release was obtained for copolymers with shorter PLA blocks than for copolymers with longer PLA blocks, at acidic pH than at pH 7.4. It is thus concluded that pH-responsive PEOz-PLA copolymer micellss could be promising as carrier of anti-tumor drugs.
研究领域:
生物材料学
·
药剂学
·
高分子化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）