CHINESE JOURNAL OF CHEMISTRY
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2011
·Vol. 29
·期 9
·1906-1910
·
IF 0.773
Lin Yan,Wenguo Yang,Lixin Li,Yang Shen,Zhiyong Jiang
A mild and facile Wittig reaction between N -substituted maleimides and aldehydes has been developed. Various synthetically valuable alkylidenesuccinimides were obtained from this one-pot reaction in high yields (up to 99%). The product was obtained by simple filtration and no extra purification was necessary. Ethanol, an environment-benign solvent, was found to be a suitable reaction medium.
研究领域:
有机化学
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药物化学
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绿色化学
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合成方法学
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medicinal chemistry
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Jiawei Gu,Hongfei Wang,Sha Li,Muhammad Sohail Riaz,Jiqiang Ning,Xiong Pu,Yong Hu
Doping engineering in nanostructured carbon materials is an effective approach to modify heteroatom species and surface electronic structures. Herein, an advanced electrode material based on a honeycomb-like porous carbon matrix with tunable N-doped configurations is prepared via 4,4′-bipyridine (4,4′-bpy)-assisted pyrolysis of SiO 2 @ZIF-8 templates and subsequent etching treatment. Interestingly, the amounts of pyridinic-N and graphitic-N can be controlled by rationally varying the content of 4,4 ′ -bpy which acts as the N source in the pyrolysis process. Both experimental results and density functional theory calculations have revealed that synergistically with 3D interconnected porous architecture, pyridinic-N and graphitic-N have different effects on the electrochemical performances in aqueous and ionic liquid gel electrolytes for symmetric supercapacitors. Highly exposed pyridinic-N endows the carbon electrode with a strengthened pseudocapacitance contribution manifested as a high specific capacitance of 436.1 F g −1 and exceptional stability of almost 100% capacitance retention after 5000 cycles at 10 A g −1 in the KOH/polyvinyl alcohol (PVA) electrolyte. By contrast, graphitic-N is propitious for reinforced electrical double-layer capacitance contribution, reflected by a maximum energy density of 125.4 Wh kg −1 in the 1-ethyl-3-methylimidazolium tetrafluoroborate/poly(vinylidene fluoride- co -hexafluoropropylene) (EMIMBF 4 /PVDF-HFP) electrolyte. This work offers an in-depth insight into the understanding of the energy storage mechanism of N-rich carbon electrodes in different electrolyte media.
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HYDROMETALLURGY
·
2023
·
IF 4.7
Yimeng Xu,Bicheng Deng,Shengting Kuang,Wuping Liao
An aminophosphonate extractant, di(2-ethylhexyl) (N, N′-di(2-ethylhexyl) amino methyl) phosphonate (abbreviated as L ) was synthesized and applied for the extraction and separation of gallium and indium from chloride solution. The maximum separation factors SF Ga/In reached 995, which is higher than those obtained with its analogues such as Cextrant 230 ( SF Ga/In = 471) and BEADP ( SF Ga/In = 201) at the optimum acidity conditions. The extracted complexes were determined to be HGaCl 4 L 2 and InCl 3 L 2 . The extraction reactions of gallium and indium were both endothermic. The loading capacities of 30 vol% L for Ga and In were 32.9 g/L and 25.2 g/L, respectively. The loaded gallium and indium in organic phase can be effectively stripped by distilled water, H 2 SO 4 and HNO 3 . A process was established for the separation and purification of gallium, by which the purity of Ga 2 O 3 increases from 98.4% to 99.97% with a yield of 92.5%.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2023
·
IF 2.6
Juan Wang,Zenghui Li,Xianyang Meng,Jiangtao Wu
In this work, liquid densities of n -octane, ethylcyclohexane and their binary mixtures {( x ) n -octane) + (1 − x ) ethylcyclohexane} with mole fraction x = (0.200, 0.400, 0.600, 0.800) are reported. The density measurements were performed with a high-pressure vibrating-tube densimeter at temperatures from (283 to 363) K and pressures up to 60 MPa. The combined expanded uncertainties (0.95 level of confidence, k = 2) are estimated to be 16 mK for temperature, 0.062 MPa for pressure, and up to 0.6 kg/m 3 for density. The experimental densities were correlated using the modified Tait equation. The average absolute percentage deviations of measurement results from the modified Tait equation correlations of n -octane, ethylcyclohexane and their binary mixtures {( x ) n -octane) + (1 − x ) ethylcyclohexane} are all lower than 0.1%. The isothermal compressibility and isobaric expansivity have also been derived from the experimental densities.
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MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2020
·Vol. 221
·期 6
·1900557
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IF 2.335
Yiran Wang,Xianhong Zhang,Yuhong Ma,Dong Chen,Changwen Zhao,Wantai Yang
This study reports a step-growth click-polymerization of 1,4-benzenedimethane (BDMT) and diethylene glycol divinyl ether (DEGVE) with 4-( N,N -diphenylamino)-benzaldehyde (DPAB) as a photoredox catalyst under irradiation of visible light. DPAB exhibits a strong UV–vis absorption at 350 nm and a strong fluorescence emission at 480 nm in anisole. There is a strong fluorescence quenching between BDMT and DPAB. The molecular weight of the polythiolether can be controlled by reaction time and monomer feed ratios. More importantly, α,ω-dithiol and α,ω-divinyl telechelic polythiolether oligomers are successfully synthesized by simply changing the molar ratios of BDMT to DEGVE. 1 H NMR and MALDI-TOF MS spectra demonstrate that the oligomers have high end group fidelity. In addition, strong fluorescence is observed when the α,ω-dithiol terminated polythiolether adds with N -(1-pyrenyl) maleimide, indicating that the as-prepared polythiolether bears reactive thiol end groups. Furthermore, high molecular weight polythiolether are prepared by chain extension with reactive polythiolether oligomers as macro-monomers. For example, α,ω-divinyl oligomer ( M n = 2000 g mol −1 ) could further react with α,ω-dithiol oligomer ( M n = 2400 g mol −1 ) to form high molecular weight polythiolether ( M n = 6000 g mol −1 ).
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Mengmeng Zhu,Junbo Wang,Lei Hou,Yiwen Yuan,Lili Liu,Yaoqing Chu,Chunmei Huang
The design and syntheses of new birefringent crystals will be of great importance in commercial applications and materials science. A series of ultraviolet (UV) birefringent crystals, AX·(H2SeO3)n (A = K, Cs; X = Cl, Br; n = 1, 2), with large sizes up to 23 × 6 × 3 mm3, was successfully synthesized by simple aqueous solution method. These four compounds belong to three different space groups. Isomorphic KCl·(H2SeO3)2 and CsCl·(H2SeO3)2 crystallize in the P1¯ space group, while CsBr·(H2SeO3)2 and CsCl·H2SeO3 crystallize in the P21/m and P21/c space groups, respectively. They exhibit cocrystal structures composed of [2(H2SeO3)]∞ and [AX]∞ frameworks, ingeniously inheriting the large optical anisotropy of selenite and the wide band gap of alkali metal halide. And it proves that these compounds indeed possess large birefringence (0.1–0.17 at 532 nm) and short UV cutoff edges (227–239 nm), achieving a balance of optical properties. This research affords a simple and viable strategy for the design and syntheses of new UV birefringent crystals. Besides, it is also found that the n value and ionic size (A and X ions) have important influences on the crystal structures and optical properties of AX·(H2SeO3)n. And this will promote further understanding of the alkali metal halide selenite family.
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EUROPEAN POLYMER JOURNAL
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2020
·
IF 3.862
Faliang Luo,Juntao Ren,Chunyu Li,Yanming Hu,Guangyuan Zhou
A styrene derivative, 4-N,N-dimethylaminostyrene (MAS), serving as both catalyst and monomer was exploited in reversible complexation mediated polymerization (RCMP). Radical trap experiment and UV–vis spectroscopy analysis revealed that MAS as a catalyst could abstract iodine from iodine-containing compound to generate propagating radical species. Kinetic studies demonstrated that the polymerization of styrene in the presence of MAS proceeded in a “living”/controlled manner, affording polymers with controlled molecular weights and narrow molecular weight distributions. The livingness of the obtained polymer was confirmed by chain extension. Determined by water contact angle measurement, incorporation of MAS into the polymer led to the enhancement of surface energy. Moreover, using α,ω-bis(2-iodo-2-phenylacetoxy)-end functionalized cis -1,4-polyisoprene as a macroinitiator which was synthesized through cross-metathesis of cis -1,4-polyisoprene with cis -1, 4-bis(2-iodo-2-phenylacetoxy)-2-butene, the polymerization of styrene in the presence of MAS also exhibited typical features of “living”/controlled radical polymerization to yield polystyrene-block-polyisoprene-block-polystyrene.
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INORGANIC CHEMISTRY
·
2015
·
IF 4.762
Fugang Li,Yangang Bi,Wenyuan Zhao,Tonglai Zhang,Zunning Zhou,Li Yang
Nitrogen-rich energetic salts involving various cations (lithium, 1; ammonium, 2; hydrazinium, 3; hydroxylammonium, 4; guanidinium, 5; aminoguanidinium, 6; diaminoguanidinium, 7; and triaminoguanidinium, 8) based on nitrogen-rich anion [Zn(BTA)2(H2O)]2– (N% = 65.37, BTA = N,N-bis[1H-tetrazol-5-yl]amine anion) were synthesized with a simple method. The crystal structures of all compounds except 1, 2, and 6 were determined by single-crystal X-ray diffraction and fully characterized by elemental analysis and FT-IR spectroscopy. The thermal stabilities were investigated by differential scanning calorimetry (DSC). The DSC results show that all compounds exhibit high thermal stabilities (decomposition temperature >200 °C). Additionally, the heats of formation were calculated on the basis of the experimental constant-volume energies of combustion measured by using bomb calorimetry. Lastly, the sensitivities toward impact and friction were assessed according to Bundesamt für Materialforschung (BAM) standard methods.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yinling Wang,Juan Wang,Dandan Wei,Maoguo Li
M–N–C electrocatalysts for the oxygen reduction reaction (ORR) have been considered as the most promising alternatives to precious metal catalysts. However, the catalytic activity of M–N–C especially in an acidic medium is still unable to meet the practical requirement, and the corresponding ORR mechanism also remains unclear. Herein, an “MOF-protective-pyrolysis” strategy was adopted to synthesize an Fe–N–C catalyst (P-FeMOF@ZIF-8) with Fe–N4 as the predominant Fe species. The P-FeMOF@ZIF-8 displays high catalytic activity in both acidic and alkaline mediums. The experimental results further reveal the different importance of the Fe species in different mediums. Based on the results, a distinct mechanism of the ORR the in acidic medium was proposed, where the synergistic effect of the Fe–N4 site and carbon in improving the kinetics of the ORR were well explained. The findings and the corresponding perspective may provide a new guidance for the design of highly efficient ORR electrocatalysts.
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Journal of Macromolecular Science Part A-Pure and Applied Chemistry
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2013
·
IF 0.807
Shaojian Lin,Wen He,Jianwu Lan,Ronghui Guo,Jiaojiao Shang,Si Chen
A series of new poly(ester-ether-imide)s (PEEIs) with potential low and high temperature application as elastomers were obtained by melting polycondensation of 1,4-butanediol (BD), dimethyl terephthalate (DMT), poly(tetramethylene glycol) (PTMG1000) and imide dihydric alcohol based on pyromellitic dianhydride (PMDA) and ethanolamine (EOA). The purity of imide dihydric alcohol was characterized by elemental analysis. The structures of imide dihydric alcohol and PEEIs were confirmed by FT-IR and 1H-NMR. The intrinsic viscosities, solubility, thermal properties, mechanical properties and low temperature elastic recovery of these polymers were investigated. The results show that the PEEIs have good solubility, and introduction of imide group endows the PEEIs with excellent thermal stability and good low temperature elastic recovery properties. Meanwhile, the mechanical properties of PEEIs are also improved.
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 8
·513
·
IF 5.4
Liu Zhikuan,Diao Quan,Shang Xiaonan,Zhu Genxing,Cao Shuai,Shi Guangyuan,Jiao Mingli
Prussian blue analogs (PBA) were etched with a weak base and subsequently sulfurized to regulate the oxygen vacancy content, leading to the preparation of defect-rich spinel bimetallic oxide NiFe 2 O 4 . This approach successfully constructed a gas sensor with high response and excellent stability, and the material was systematically characterized. The results show that weak base etching regulates the morphology of PBA, and sulfur doping is employed to control the oxygen vacancy content. Gas sensing results confirmed that the modified NiFe 2 O 4 -NCs@S exhibited superior n-butanol gas sensing performance. Specifically, the sensing response of NiFe 2 O 4 -NCs@S to 100 ppm n-butanol at 275 °C reached 59.29, representing a 9.9-fold enhancement compared with NiFe 2 O 4 -PBA (response = 5.98). In addition, comprehensive tests demonstrate that the sensor possesses reliable selectivity, long-term stability and repeatability. To investigate the sensing mechanism, UV–vis spectroscopy and electrochemical characterizations were performed to verify that oxygen vacancies boost gas-sensing properties via band gap narrowing and electronic structure modulation. This work offers a novel strategy for developing high-response n-butanol gas sensors. Graphical
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Energies
·
2026
·Vol. 19
·期 12
·2790
·
IF 3.9
Jin Liang,Xiaojin Liu,Weiye Ma,Zhiyi Pan,Zhiqiang Liu,Yuxin Liang,Wence Xu,Shengli Zhu,Zhonghui Gao
N-doped Li2ZrCl6−3xNxchloride solid electrolytes were synthesized via a mechanochemical method, and the effects of N incorporation on crystal structure, Li local environment, and Li+transport were systematically investigated. X-ray diffraction suggested that the main Li2ZrCl6-related diffraction features were largely retained, while N introduction induced partial structural evolution towardC2/m-related features. 7Li MAS NMR revealed that N incorporation sharpened Li resonance peaks. Among the series, Li2ZrCl5.7N0.1exhibited the highest room-temperature ionic conductivity of 1.15 mS cm−1, with the lowest activation energy of 0.237 eV, demonstrating a reduced Li+migration barrier. All-solid-state batteries incorporating Li2ZrCl5.7N0.1showed stable rate capability and long-term cycling, retaining 85.9% capacity after 500 cycles at 1C and 77.4% after 3000 cycles at 3C. These results suggest that appropriate N modification can tune the Li2ZrCl6-based structure and Li local environment, thereby improving Li+transport in all-solid-state lithium batteries. This work provides a feasible strategy for improving chloride-based solid electrolytes for next-generation energy storage.
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