Inorganics
·
2024
·Vol. 12
·期 11
·273
·
IF 3.1
Quan Yang,Xiansong Jia,Zhikang Qin,Xiaoli Ding,Yongtao Li
Carbon-based materials with excellent catalytic activity provide new ideas for the development of magnesium-based hydrogen storage. C-H bonding interactions may play a key role in performance improvement. In this work, we comprehensively compare the magnesium-carbon cloth composites (CC) prepared by method of dry ball milling and wet impregnation. The results were that the hydrogen release activation energy (Ea) of MgH2@CC composites prepared by wet immersion method was 175.1 ± 19.5 kJ·mol−1, which was lower than that of pure MgH2(Ea= 213.9 ± 6.4 kJ·mol−1), and the activation energy of MgH2-CC composites prepared by ball milling method was 137.3 ± 8.7 kJ·mol−1, which provided better results. The kinetic enhancement should be attributed to C-H interactions. The presence of carbon carriers and electron transfer to reduce the activation energy of Mg-H bond fracture. These results will provide further insights into the promotion of hydrogen ab-/desorption from metal hydrides.
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高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 28
·e202402061
·
IF 1.9
Jiankang Ou,Haoyu Liu,Zeguo Fang,Qian Zhang,Dong Li
Graphical Construction of C−C bonds of alkyl-substituted naphthoquinones through C−H/C−H cross dehydrogenation coupling of naphthoquinones with acetone and 1,3-dicarbonyl compounds was developed. A direct C−H alkylation of naphthoquinones with acetone and 1,3-dicarbonyl compounds was developed to construct C−C bonds of alkyl-substituted naphthoquinone derivatives. It proceeded through an oxidative radical cross dehydrogenation coupling process under simple and mild conditions. This method provides a facile and efficient route for synthesis of functionalized naphthoquinones from readily available feedstocks.
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JOURNAL OF ORGANIC CHEMISTRY
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2021
·
IF 4.354
Ming Li,Jun-Yang Tao,Liang-Neng Wang,Jia-Wei Li,Yue-Jin Liu,Ming-Hua Zeng
Modification of commercially available biaryl monophosphine ligands via ruthenium(II)-catalyzed P(III)-directed-catalyzed ortho C–H secondary alkylation is described. The use of highly ring-strained norbornene as a secondary alkylating reagent is the key to this transformation. A series of highly bulky ligands with a norbornyl group were obtained in excellent yields. The modified ligands with secondary alkyl group outperformed common substituted phosphines in the Suzuki–Miyaura cross-coupling reaction at a ppm mole level of Pd catalyst.
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高影响因子
ORGANIC & BIOMOLECULAR CHEMISTRY
·
2018
·Vol. 16
·期 33
·5999-6005
·
IF 3.423
Jie Zhu,Baojun Xu,Jingjing Yu,Yaokun Ren,Jin Wang,Ping Xie,Charles U. Pittman,Aihua Zhou
Flavone selenide or sulfur-containing derivatives are pretty valuable in drug discovery due to their diversity of important bioactivities. Here, two simple Cu-catalyzed methods of constructing C–Se and C–S bonds on flavone skeletal structures via C–H functionalization are reported, which regioselectively afford flavone selenide and sulfide derivatives in good yields using cheap KSeCN or KSCN salts as selenium and sulfur agents. These methods further enrich the current C–Se and C–S bond construction methods.
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Desalination and Water Treatment
·
2025
·
IF 1
Da Ma,Xusheng Li,Huian Zou,Yi Qian,Mengqi Li,Wenchuan Xu
Nano zero-valent iron (NZVI) was successfully stabilized by using hydroxypropyl methyl cellulose (HPMC). Systematic characterization observations (including XRD, TEM, FTIR, and VSM), as well as settling performance, illustrated that, compared to bare nano zero-valent iron particles (NZVI), the dispersity and antioxidizability of HPMC-stabilized nanoscale zero-valent iron particles (H-NZVI) were improved. Nitrate reduction efficiencies by using iron powder, NZVI, H-NZVI-5, H-NZVI-10, and H-NZVI-20 were examined, and the results showed that a moderate amount of HPMC in modification can help prevent the aggregation of NZVI and achieve high reduction efficiency. Excessive HPMC in preparation led to a decline in reduction efficiency. In addition, effects of initial pH, dissolved oxygen concentrations, and reaction temperatures on nitrate removal were studied. The results showed that the efficiency decreased with increases in initial pH and dissolved oxygen concentrations. However, the stabilized NZVI showed great superiority to bare NZVI, maintaining high activity even at basic pH or aerobic conditions. Pseudo first-order kinetics was applied to study nitrate reduction kinetics and confirmed to correlate well with experimental data. Through analysis of rate constants at different temperatures, the apparent activation energy for nitrate reduction by H-NZVI-10 was calculated to be approximately 15.18 kJ/mol. This study demonstrates that HPMC-stabilized NZVI can serve as a promising nanomaterial for enhancing nitrate reduction of nitrate.
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高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2025
·
IF 4.6
Xu Xia,Chenyang Ma,Tianen Yang,Zhiyuan Ma,Yu Cao,Jiahuan He,Qiwen Zheng,Huaping Hong,Ji Xiong
This study investigates gradient cemented carbide with a cubic phase-free surface layer (CFL), commonly used as substrates for coated inserts to extend their service life. The tough gradient surface layer effectively prevents crack propagation, minimizing coating delamination and edge chipping. We propose using hexagonal boron nitride (h-BN) as a non-cubic nitrogen source for fabricating gradient cemented carbide with cubic (W,Ti)C, as a replacement for traditional cubic nitrogen sources. By employing powder metallurgy, we successfully created gradient cemented carbide with a CFL derived from h-BN. We also analyze the mechanism of gradient structure formation and characterize the microstructure, elemental distribution, and mechanical properties of the novel materials. The results demonstrate the feasibility of producing gradient cemented carbides with a CFL when h-BN is used as the nitrogen source. The crystal orientations at the gradient boundary are randomly distributed, showing no abrupt interface between the surface layer and the interior. Notably, titanium (Ti) and boron (B) are nearly absent in the surface layer, while cobalt (Co) shows higher concentration compared to the interior. The use of h-BN facilitates a nearly homogeneous titanium distribution in the subsurface zone, contrasting with the clustering seen when traditional cubic TiN is employed as the nitrogen source. Additionally, the thickness of the gradient surface layer can be effectively controlled by adjusting the h-BN levels, increasing with higher h-BN content in the raw materials. However, excessive h-BN addition facilitates abnormal WC phase growth in cemented carbides, and negatively affects transverse rupture strength despite the toughening effects of the cubic phase-free layer. Increased h-BN content also promotes the formation of TiB phases, which enhances the hardness of the cemented carbide.
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高影响因子
Journal of Building Engineering
·
2024
·
IF 6.7
Baomin Wang,Weigao Ding,Chengcheng Fan,Fei Liu,Wenxin Lu,Haoxiang Yang
C-S-H gel is a complex cementitious system, and the properties present significant difference with various Ca/Si ratios. The immobilization mechanism of three heavy metals in C-S-H gel at various Ca/Si ratios was investigated in this work from the prospect of the physical adsorption and chemical immobilization. Results showed that higher Ca/Si ratios can result in an increase in silicon chain polymerization, and lower BET specific area, and C-S-H gel with various Ca/Si ratios showed the excellent immobilization for heavy metals. Pb(II) and Zn(II) can form hydroxyl complex polyhedra in C-S-H under strongly alkaline environments, and increase the silicon chain polymerization degree similar to the doping of C-S-H gel by Al. However, Cd(II) was immobilized in the C-S-H gel with the formation of a solid solution under the action of ion exchange with Ca(II), rather than in the form of hydroxyl complex polyhedral and cadmium hydroxide coprecipitates. The highest adsorption capacity of Pb(II) was realized in C-S-H gel with a Ca/Si molar ratio of 0.9, reaching 95.6006 mg/g. Pb(II) was mainly immobilized in C-S-H gel via physical and chemical adsorption, and the effect of chemical adsorption tended to be significant as the Ca/Si molar ratio increased. And the formation of Pb 8 Ca(Si 2 O 7 ) 3 can be detected in C-S-H gel with a higher Ca/Si molar ratio.
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JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2025
·
IF 3.4
Xiaoyan Gao,Nisar Ali,Meng Zhao,Guang Hu,Adnan Khan,Dandan Min,Lijing Zhang,Lingli Ni,Mohammed Albahri
Nacre-like polymer nanocomposites have become fascinating material nowadays because of their exceptional mechanical property. In this study, nacre-like waterborne polyurethane/hexagonal boron nitride (WPU/h-BN) nanocomposite with high-thermal, mechanical and water resistance has been successfully prepared via mechanical blending method. Owing to strong interfacial interactions and a nacre-like structure, the WPU/h-BN nanocomposite with a loading amount of 30 wt% exhibits excellent tensile strength of 27.3 MPa, compared with 4.16 MPa for pure WPU. Additionally, it has an exceptional maximum decomposition temperature of 443 °C and an outstanding water absorption ratio of 8.1 %. This approach of adopting h-BN and WPU to construct nacre-like structure may provide a new path for preparing high performance WPU strategies.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 54
·48590-48598
·
IF 3.289
Yu Shang,Bo Jin,Rufang Peng,Zhicheng Guo,Qiangqiang Liu,Jun Zhao,Qingchun Zhang
A series of nitrogen-rich heterocyclic 1H,1′H-5,5′-bistetrazole-1,1′-diolate salts, namely, 1,2,4-triazolium (2), 3-amino-1,2,4-triazolium (3), 4-amino-1,2,4-triazolium (4), 3,5-diamino-1,2,4-triazolium (5), 2-methylimidazolium (6), imidazolium (7), pyrazolium (8), 3-amino-5-hydroxypyrazolium (9), dicyandiamidine (10), and 2,4-diamino-6-methyl-1,3,5-triazin (11), was synthesized with cations. These energetic salts were fully characterized through FT-IR, 1H NMR, 13C NMR, and elemental analysis. The structures of 2, 3·7H2O, 6·2H2O, 8, and 10·4H2O were further confirmed through single crystal X-ray diffraction. Their thermal stabilities were investigated through differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The results indicated that all of the salts possess excellent thermal stabilities with decomposition temperatures ranging from 225.7 °C to 314.0 °C. On the basis of the Kamlet–Jacobs formula, we carefully calculated their detonation velocities and detonation pressures. All of the salts, except 11, exhibit promising detonation performances with a detonation pressure of 20.23–28.69 GPa and a detonation velocity of 7050–8218 m s−1. These values are much higher than those of TNT. The impact sensitivities of the compounds were determined via a Fall hammer test. All of the compounds show excellent impact sensitivities of >50 J, and this finding is higher than that of TATB (50 J). Therefore, these ionic salts with excellent energetic properties could be applied as new energetic materials.
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MACROMOLECULES
·
2020
·
IF 5.918
Jia Wang,Yue Chen,Canbin Ye,Anjun Qin,Ben Zhong Tang
The heteroatom-containing polymers are important components of advanced functional materials. Among the tremendous synthetic methodologies, polymerization via C–H activation is a powerful tool for the preparation of functional heteroatom-containing polymers, which should be further enriched, especially via C(sp3)–H activation. In this work, a new atom economic Pd(0)/benzoic acid catalyzed polymerization of internal diynes and secondary diamines via C(sp3)–H activation; i.e., C(sp3)–H polyamination of internal alkynes was successfully established. A series of regio- and stereoregular functional poly(allylic tertiary amine)s with high weight-average molecular weights (Mw, up to 25 600) were synthesized in excellent yields (up to 98%). The resultant polymers possess good solubility and film-forming ability, and their thin films exhibit high refraction indices (RI) with the range of 1.7207–1.6797 at 632.8 nm. Moreover, all the poly(allylic tertiary amine)s are emissive in solution and solid states. Thanks to the tolerance to functional groups of this polymerization, the tetraphenylethene (TPE) moiety could be facilely incorporated to endow the resultant polymers with the unique aggregation-enhanced emission (AEE) characteristics. Thus, this work not only establishes a powerful C(sp3)–H polyamination but also provides a strategy to facilely prepare functional nitrogen-containing acetylenic polymers.
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Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Yunchao Feng,Miao Zuo,Ting Wang,Wenlong Jia,Xiaoyu Zhao,Xianhai Zeng,Yong Sun,Xing Tang,Tingzhou Lei,Lu Lin
Production of 5-hydroxymethylfurfural (HMF) from glucose with high yield remains a big challenge. Thereinto, assembling catalysts with outstanding performance is the bottleneck at the current stage. In this study, effective catalysts were synthesized by loading SO 4 2− /ZrO 2 (SZ) on a series of H + zeolites to investigate the catalytic dehydration of glucose into HMF. Among all the catalysts applied, 2-SZ-HM-550 (HZSM-5 with Si/Al molar ratios of 80∼150, calcined at 550 °C) gave the yields of HMF 41.32%, 61.14%, 54.67% and 40.71% in 4 applied reaction systems, respectively. Moreover, HMF with desirable yield was obtained while other carbohydrates were dehydrated catalyzed by 2-SZ-HM-550, such as fructose, sucrose, inulin and starch.
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STAR Protocols
·
2022
·
IF 0
Tao Shen,Wenhao Li,Yan Zhao,Yunqi Liu,Yang Wang
Summary Syntheses using classic coupling reactions can be tedious, leading to a dearth of ambipolar semiconducting polymers. Here, we detail the rapid synthesis of balanced ambipolar polymers by using a carbon-hydrogen (C–H) activation strategy. Using this protocol, two C–H reactive hydrogenated monomers and six ambipolar polymers can be rapidly synthesized within 2 h via C–H activation and the optoelectronic properties of the resultant polymers can be characterized. We also describe the fabrication process and performance evaluation of the ambipolar polymers-based organic transistors. For complete details on the use and execution of this protocol, please refer to Shen et al. (2022) .
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PubMed
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