CHINESE JOURNAL OF CHEMISTRY
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2022
·Vol. 41
·期 3
·307-313
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IF 5.56
Run-Ze Yuan,Peng-Fei Cui,Yue-Jian Lin,Guo-Xin Jin
Comprehensive Summary Herein, we describe the synthesis of a carborane-supported octanuclear palladacycle complex, Pd 8 ( o -C 2 B 10 H 10 CS 2 CH 3 ) 4 Cl 4 (CH 3 CN) 4 (complex 1 ), with B(3)–H activations on o -carborane ligand. The substitution reaction of 1 has been explored, and three of its substituted complexes Pd 8 ( o -C 2 B 10 H 10 CS 2 CH 3 ) 4 Cl 4 (L) 4 (L = t BuNC, 2 ; L = C 5 H 5 N, 3 ; L = C 4 H 8 S, 4 ) have been synthesized. The m - and p -carborane disubstituted ligands m - and p -C 2 B 10 H 10 (CS 2 CH 3 ) 2 (ligands 5 and 6 ) as well as their B—H activated carborane complexes [ m -C 2 B 10 H 9 (CS 2 CH 3 ) 2 PdCl] ( 7 ) and [ p -C 2 B 10 H 8 (CS 2 CH 3 ) 2 ][PdCl( t BuNC)] 2 ( 8 ) have also been synthesized by the similar method. All of these complexes have been characterized, including X-ray single crystal diffraction, NMR spectroscopy, IR spectroscopy and elemental analysis methods.
研究领域:
无机化学
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材料科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Xiangchen Kong,Chao Liu,Ming Lei,Feng Gong,Yue Han,Yuyang Fan,Ming Li,Rui Xiao
The fundamental understanding of the catalytic performance of copper-based catalysts for lignin hydroconversion is delayed compared with the empirical optimization of the catalyst preparation. Herein, we investigate the interplay between the lignin-abundant oxygen-containing functional groups and Cu active species via the catalytic β-O-4 lignin linkage hydrogenolysis. Catalyst performance data and elemental spectra characterizing the catalyst demonstrate the dominance of Cu0 in the catalysis. Remarkably, Cα–OH and Cα═O in the aliphatic chain play critical roles in this process, without which the linkage cannot be broken. These groups markedly accelerate the linkage cleavage by decreasing both the chemisorption energy between Cβ–O and Cu0 and the bond dissociation energy of the linkage. On the contrary, the methoxyl groups attached to the aromatic rings hinder the bond cleavage as a result of the steric effect. Such hindrance is significantly affected by the amount and position of the methoxyl groups. The results of this work highlight the importance of the unique structures of lignin in its reductive depolymerization catalyzed by copper-based catalysts, which appear to offer an opportunity for tailoring efficient copper-based catalysts for lignin hydrogenolysis.
研究领域:
化学工程
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催化
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可再生能源
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Zhen Wang,Yunhao Wu,Jianjian Zhong,Jianling Li
Two-dimensional transition metal carbide/nitride MXenes have become a hot topic in the field of lithium-ion energy storage due to their unique surface chemistry and excellent electronic conductivity. However, electrodes made of multilayer MXenes suffer from low capacity, poor cycling performance, and slow lithiation kinetics. In this paper, the MoP2@Ti3C2Tx composite was prepared by adsorbing Mo cations on the surface of Ti3C2Tx followed by phosphatization. The uniformly distributed MoP2 nanostructure effectively increases the layer spacing, enlarges the specific surface area, and improves the structural stability of the material. At the same time, MoP2 and Ti3C2Tx are connected by a P−O bond, which accelerates the diffusion and migration of lithium ions and the charge transfer, and the strong covalent Ti−O−P bond can cause rapid charge transfer and stabilize the structure of the material. The electrochemical activity of MoP2 nanostructures also provides more active sites for lithium ions. The presence of the lamellar structure of Ti3C2Tx also inhibits to some extent the expansion of the transition metal phosphide volume with the cycling process, thus realizing more excellent lithium storage capacity. 1/2 MoP2@Ti3C2Tx material has a high reversible capacity of 165.7 mAh g−1 (172% improvement over the original material) at a current density of 3000 mA g−1. The assembled 1/2 MoP2@Ti3C2Tx//AC Li-ion hybrid capacitor LIC has 85.5% capacity retention after cycling at a current density of 1500 mA g−1. The ability of the assembled full battery to illuminate light-emitting diode (LED) light bulbs further confirms that the electrochemical reliability of the device meets the requirements of real-world applications. The results demonstrate that the strategy of constructing in situ-grown MoP2 nanostructures can effectively improve MXene high-energy-density applications in lithium-ion energy storage.
研究领域:
材料科学
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储能技术
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 37
·e02789
·
IF 2
Li Zhong,Yuxin Duan,Meiying Wang,Xiao Xu,Minghuan Qian,Xu Jia
The polymers of N , N -diethylacrylamide (DEA) exhibit temperature-dependent sensitivity attributable to the presence of both hydrophilic and hydrophobic groups. However, their lower critical solution temperature (LCST) is only 25 °C, a limitation that restricts their practical applications. Previous studies have shown that the incorporation of cationic monomers for copolymerization can enhance the LCST of polymers. In this study, dimethyldiallylammonium chloride (DMDAAC) and DEA were selected for copolymerization to obtain a series of thermosensitive water-soluble polymers, poly(DMDAAC- co -DEA). Structure and properties were characterized using FT-IR, 1 H NMR, TG-DSC, and surface tension test. Combined with the critical phase transition mechanism, it was determined that the hydrophilicity of the polymer underwent a gradual increase in proportion with the increase of DMDAAC blocks in polymers, and the LCST exhibited an increase of up to 36.8 °C. The relationship between polymer structure and demulsification performance was also explored, as represented by the application of O/W emulsion. The experimental findings demonstrated that all poly(DMDAAC- co -DEA) products exhibited effective demulsification performance. The demulsification rate of the polymers with 30%, 50%, and 70% of DMDAAC could reach 97.03%, 98.20%, and 98.40% respectively, which shows great potential for the petroleum demulsification application. Graphical Water-soluble polymer Poly(DMDAAC- co -DEA) are synthesized using a three-step heating method. A comprehensive investigation is conducted into the relationship between its LCST and copolymerization ratio, resulting in the elucidation of the underlying mechanism. Furthermore, the demulsifying properties of the copolymer are investigated.
研究领域:
高分子化学
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石油化学
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胶体与界面科学
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功能材料
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分离技术
✓ 已验证
产品关联
DOI
高影响因子
Light-Science & Applications
·
2022
·Vol. 11
·期 1
·1-11
·
IF 20.257
Li Pengfei,Xue Shanshan,Sun Lu,Zong Xupeng,An Li,Qu Dan,Wang Xiayan,Sun Zaicheng
Carbon dots (CDs) as the advancing fluorescent carbon nanomaterial have superior potential and prospective. However, the ambiguous photoluminescence (PL) mechanism and intricate structure-function relationship become the greatest hindrances in the development and applications of CDs. Herein, red emissive CDs were synthesized in high yield from o -phenylenediamine (oPD) and catechol (CAT). The PL mechanism of the CDs is considered as the molecular state fluorophores because 5,14-dihydroquinoxalino[2,3-b] phenazine (DHQP) is separated and exhibits the same PL properties and behavior as the CDs. These include the peak position and shape of the PL emission and PL excitation and the emission dependence on pH and solvent polarity. Both of them display close PL lifetime decays. Based on these, we deduce that DHQP is the fluorophore of the red emissive CDs and the PL mechanism of CDs is similar to DHQP. During the PL emission of CDs, the electron of the molecule state can transfer to CDs. The formation process of DHQP is further confirmed by the reaction intermediates (phthalazine, dimers) and oPD. These findings provide insights into the PL mechanism of this type of CDs and may guide the further development of tunable CDs for tailored properties.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2023
·
IF 6.1
Zhengming Xu,Shuang Liu,Huining Lai,Lijun You,Zhengang Zhao
Arbutin, salidroside, polydatin, and phlorizin are typically natural bioactive phenolic glycosides. To improve the liposolubility and bioavailability, highly liposoluble derivatives including 6′-O-lauryl arbutin, 6′-O-lauryl salidroside, 6″-O-lauryl polydatin, and 6″-O-lauryl phlorizin were efficiently synthesized by enzymatic acylation in a green solvent 2-MeTHF. Their reaction conversions reached 84.4, 99.5, 99.8, and 89.1%, respectively, when catalyzed by Lipozyme 435 at 20 mg/mL at 50 °C. As expected, the derivatives had high log P (1.66–2.37) and retained good antioxidant activity, making them potential alternatives to butylated hydroxytoluene (BHT) and tert-butyl-hydroquinone (TBHQ) in lipid systems. Then, the intestinal permeability characteristics and metabolism of phenolic glycosides and their derivatives were investigated based on Caco-2 monolayers. The permeability of polydatin and phlorizin was mainly through active transport, but that of arbutin and salidroside involved both passive diffusion and active uptake. The acylated derivatives suffered from severe CES-mediated hydrolysis but exhibited a larger transported amount than phenolic glycosides.
研究领域:
药学
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有机化学
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生物化学
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药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Bo Lu,Dan Huang,Hua Zheng,Zhijun Huang,Peihu Xu,Haixing Xu,Yihua Yin,Xia Liu,Dan Li,Xueqiong Zhang
A series of melphalan-O-carboxymethyl chitosan (Mel-OCM-chitosan) conjugates with different spacers were prepared and structurally characterized. All conjugates showed satisfactory water-solubility (160-217 times of Mel solubility). In vitro drug release behaviors by both chemical and enzymatic hydrolysis were investigated. The prodrugs released Mel rapidly within papain and lysosomal enzymes of about 40–75%, while released only about 4–5% in buffer and plasma, which suggested that the conjugates have good plasma stability and the hydrolysis in both papain and lysosomes occurs mostly via enzymolysis. It was found that the spacers have important effect on the drug content, water solubility, drug release properties and cytotoxicity of Mel-OCM-chitosan conjugates. Cytotoxicity studies by MTT assay demonstrated that these conjugates had 52–70% of cytotoxicity against RPMI8226 cells in vitro as compared with free Mel, indicating the conjugates did not lose anti-cancer activity of Mel. Overall these studies indicated Mel-OCM-chitosan conjugates as potential prodrugs for cancer treatment.
研究领域:
药学
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肿瘤学
✓ 已验证
DOI
PubMed
高影响因子
npj Science of Food
·
2025
·Vol. 9
·期 1
·1-9
·
IF 7.8
Liu Kai,Lian Yinyin,Xie Xingyun,Gao Yuyang,Song Jiajia,Suo Huayi,Zhang Yu
This study investigates the impact of O. oeni on the quality of blueberry wine, employing various analytical methods to determine parameters such as alcohol content, antioxidant capacity, organic acids, amino acids, and volatile components. The results demonstrated that co-inoculation with O. oeni significantly decreased the titratable acidity of blueberry wine. Among the organic acids, the malic acid content of ST and SE groups decreased by (26.24 ± 1.24)% and (35.75 ± 4.02)%, respectively. The main consumed amino acids were aspartate, lysine, and arginine after co-inoculation with O. oeni . Additionally, co-inoculation with O. oeni significantly increased the content of medium-chain fatty acid ethyl esters, especially isoamyl acetate content. The antioxidant capacity of blueberry wine was significantly enhanced by co-inoculation with O. oeni , particularly in terms of measurement of 1,1-diphenyl-2-picryl-hydrazyl (DPPH) clearance. The findings of this study provide a solid basis for improving the quality of blueberry wine and promoting the growth of blueberry wine industry.
研究领域:
食品科学
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微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-12
·
IF 4.259
Wu Zhaoguan,Li Henghui,Zhang Qiwei,Liu Xin,Zheng Qi,Li Jianjun
O -Acetylation of sialic acid in protein N-glycans is an important modification and can occur at either 4-, 7-, 8- or 9-position in various combinations. This modification is usually labile under alkaline reaction conditions. Consequently, a permethylation-based analytical method, which has been widely used in glycomics studies, is not suitable for profiling O -acetylation of sialic acids due to the harsh reaction conditions. Alternatively, methylamidation can be used for N-glycan analysis without affecting the base-labile modification of sialic acid. In this report, we applied both permethylation and methylamidation approaches to the analysis of O -acetylation in sialic acids. It has been demonstrated that methylamidation not only stabilizes sialic acids during MALDI processing but also allow for characterization of their O -acetylation pattern. In addition, LC-MS/MS experiments were carried out to distinguish between the O -acetylated glycans with potential isomeric structures. The repeatability of methylamidation was examined to evaluate the applicability of the approach to profiling of O -acetylation in sialic acids. In conclusion, the combination of methylamidation and permethylation methodology is a powerful MALDI-TOF MS-based tool for profiling O -acetylation in sialic acids applicable to screening of N-glycans.
研究领域:
生物化学
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分析化学
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糖组学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhilei Guo,Guohua Jing,Sara A. Tolba,Chung-shin Yuan,Yu-Hua Li,Xiaowei Zhang,Zhiwei Huang,Huawang Zhao,Xiaomin Wu,Huazhen Shen,Wenjie Xia
Transition metal oxide (TMO)-decorated TiO 2 catalysts excel at low-temperature Hg 0 oxidation. However, TMOs are typically found in large nanoparticles (NPs), resulting in a lower atom utilization efficiency. The current paper presents the design of an Au single atom (SA)-doped Ti 4+ defected TiO 2 (Au SAC-Ti 1-x O 2 ) and investigations concerning the influence of an O-Au-O coordination environment on Hg 0 oxidation. Au SAC-Ti 1-x O 2 was designed using an O-Au-O coordination environment and the O-Au-O orbital interaction was elucidated using density functional theory (DFT). The enhanced oxidative capability of lattice oxygen atoms and the interaction between Hg 0 and oxygen atoms were investigated. The O-Au-O coordination environment containing Au SAC Ti 1-x O 2 was then synthesized and characterized using X-ray absorption fine structure (XAFS), X-ray photoelectron spectroscopy (XPS), etc. Finally, Hg 0 oxidation catalytic activity was determined. Due to the increasing population of Au-O antibonding orbital interactions in the valence band, the bond order of O-Au-O in Au SAC Ti 1-x O 2 decreased significantly, thereby enhancing the oxidation ability of its adjacent oxygen atoms. Au SA and ultra-small Au clusters coexisted on a Ti 1-x O 2 catalyst, and the Hg 0 -oxidation efficiency at 150–200 °C was 14 times and 1.5 times greater than those of TiO 2 and 0.1 % Au/TiO 2 , respectively. Furthermore, Au SAC Ti 1-x O 2 was more resistant to the inhibition of SO 2 and NO. It provides an efficient method for developing highly active SA catalysts for Hg 0 oxidation.
研究领域:
催化化学
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环境科学
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材料化学
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理论与计算化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 17
·12374-12387
·
IF 2.993
Ye Zhengqing,Wang Feijun,Jia Chao,Shao Ziqiang
Three-dimensional (3D) O, N-codoped activated carbon aerogels with ultramicropores were prepared via oxidation polymerization, freeze-drying, and carbonization/activation of aniline and sodium alginate. All the O, N-codoped activated carbon aerogels exhibit 3D interconnected hierarchical porous network structures with high specific surface areas (1337–1695 m 2 g −1 ), ultramicropores (0.52–0.54 nm), and rich O (12.68–18.48%) and N (1.18–3.59%) doping. A typical 3D O, N-codoped activated carbon aerogel (ACA700) obtained at the activation of 700 °C exhibits excellent electrochemical performance. When ACA700 is utilized as electrode materials for supercapacitor, the highest specific capacitance of 342 F g −1 at a current density of 2 A g −1 in 3 M H 2 SO 4 electrolyte is achieved. Furthermore, ACA700//ACA700 all-solid-state supercapacitor device displays acceptable energy density (3.8 Wh kg −1 ) at a power density of 246.0 W kg −1 , extraordinary coulombic efficiency (95.8%), and good rate capability. Therefore, the sustainable 3D O, N-codoped activated carbon aerogels with ultramicropores demonstrate tremendous potential for energy storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2012
·
IF 3.903
Manhong Liu,Xinxin Mo,Yanyan Liu,Hailian Xiao,Yu Zhang,Jieying Jing,Vicki L. Colvin,William W. Yu
Colloidal platinum nanoparticles with 2.2 nm were immobilized on γ-iron oxide (γ-Fe 2 O 3 ) powder to make a supported catalyst (Pt/γ-Fe 2 O 3 ) with controlled Pt nanoparticle size and size distribution. This catalyst was used to catalyze the selective hydrogenation of o -chlorobenzene to o -chloroaniline without using any solvent; 99.9% selectivity at 99.95% conversion was achieved.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）