APPLIED ORGANOMETALLIC CHEMISTRY
·
2013
·Vol. 27
·期 6
·337-340
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IF 2.011
Junyu Dong,Tianbin Li,Chuan Dai,Wen Weng,Xinghua Xue,Yuyu Zhang,Qingle Zeng
A straightforward, protecting-group-free protocol for the synthesis of chiral 6-substituted and 6,6’-disubstituted binols (binol = 1,1’-bi-2-naphthol) by palladium-catalyzed hydroxylation, C–N and C–O coupling of chiral 6-bromo- and 6,6’ -dibromo-1,1’-binaphthols is developed. The protecting group free palladium-catalyzed hydroxylation, C–O and C–N cross-coupling protocol affords a straightforward and general method for the synthesis of chiral 6-substituted and 6,6’-disubstituted binols with good yields, avoiding the tedious procedures of introduction and removal of protecting groups. Copyright © 2013 John Wiley & Sons, Ltd.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2025
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IF 4.6
Heyun Zhang,Huan Zhang,Jihong Huang,Liping Du,Lijuan Ma,Juan Wang,Yurong Xing,Xiaorui Song
Fu brick tea (FBT) is prized for its unique aroma, yet the dynamic evolution of its key aroma-active compounds during storage remains unclear. To investigate this dynamic change, headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography-olfactometry-mass spectrometry (GC-O-MS) and sensory omics analysis were employed for the comprehensive characterization of aroma-active compounds in five FBT samples. A total of 47 aroma-active compounds were detected, 15 of which were further determined as the key aroma-active compounds based on high flavor dilution (FD) factors, aroma intensities (AI), and odor activity value (OAV). Notably, although dihydroactindiolide exhibited high contents in HF15-HF19 (1733-2156 µg/kg), it was not classified as a key aroma compound. Multivariate statistical analysis revealed that the “stale” aroma attribute was strongly associated with aged FBT samples, while “minty” and “grassy” attributes were characteristic of newly produced FBT. Furthermore, aroma recombination and omission tests combined sensory evaluation confirmed that hexanal, 2-hexenal, ( E, E )-2,4-hexadienal, ( E, Z )-2,6-nonadienal, safranal, ( E, E )-2,4-nonadien-1-al, β -ionone, linalool and cedrol played decisive roles in constructing the overall aroma profile of FBT. This research provides detailed insights into the evolution of FBT aroma during storage, which can serve as a theoretical basis for optimizing FBT storage processes and improving its quality stability.
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JOURNAL OF MATERIALS SCIENCE
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2025
·
IF 3.9
Du Haoming,Wu Shenghao,Zhao Yuxuan
In this study, a series of non-equimolar ratio high-entropy rock-salt-type oxides (Mg, Co, Ni, Cu, Zn)O were prepared a high-temperature solid-phase method with tailored cation ratios, and their physical phase compositions and electrochemical properties were investigated. The result shows that (Mg, Co, Ni, Cu, Zn)O with varying elemental ratios form single-phase rock-salt structures when they are sintered at 1100°C under non-equimolar conditions. These oxides display a uniformly elemental distribution and irregular spherical particle morphology. With the increase in Ni or Co content, the electrochemical performance is significantly improved. Compared to the other six high-entropy oxides, (Mg0.1625, Co0.1625, Ni0.35, Cu0.1625, Zn0.1625)O powders have demonstrated excellent energy storage properties and rate capability, achieving a specific capacitance of 384.3 F/g at 1 A/g and a coulombic efficiency of 88.9%. These results demonstrate that non-equimolar (Mg, Co, Ni, Cu, Zn)O high-entropy rock-salt-type oxides have promising potential as advanced electrode materials. Graphical
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JOURNAL OF MOLECULAR STRUCTURE
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2025
·
IF 4.7
Di-Ming Chen,Xue-Jing Zhang,Dong-Ying Shi,Lin Han
The separation of C 2 H 6 (ethane) from C 2 H 4 (ethylene) to produce C 2 H 4 with high purity is an important but challenging task in chemical industry due to their similar physical properties including molecular sizes and boiling points. Metal-organic frameworks (MOFs) with modifiable pore surroundings give new avenues for the development of functional materials for the targeted gas selective separation, especially for the design of C 2 H 6 -selective ones with simplified separation process and reduced energy consumption compared with those C 2 H 4 -selective ones. In the present study, a new Co(II)-based MOF featuring the formula of {[Co 2 (μ 2 -OH)(CPT) 2 (HCOO)](DMF) 3 (MeOH)} n ( 1 ) has been successfully prepared by reaction of Co(II) salt with a bifunctional organic ligand 4-(4 H -1,2,4-triazol-4-yl)benzoic acid (HCPT). The microporous pore surroundings of 1 feature high density of aromatic benzene ring and triazole groups coupled with uncoordinated O atoms, which collectively generate stronger interactions with C 2 H 6 molecules than with C 2 H 4 as revealed by the following dispersion corrected DFT calculations. As a result, the activated 1 shows a high C 2 H 6 uptake capacity of 109.1 cm 3 /g with a moderate high C 2 H 6 /C 2 H 4 (50:50) selectivity of 1.92 at 298 K and 1 bar, and such a separation ability was further supported by the breakthrough experiment. To further probe the underlying separation mechanism, the molecular dynamic simulation and DFT calculations were carried out, and the results coincide well with the experimental ones, which point out that the multiple synergistic interactions between C 2 H 6 molecules with the pore surface of 1 account for the high C 2 H 6 uptake capacity and C 2 H 6 /C 2 H 4 selectivity.
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Polymer Chemistry
·
2017
·Vol. 8
·期 9
·1573-1578
·
IF 5.375
Ze Li,Chunyong Wu,Lifeng Liu,Meijiang Li,Xiongfa Yang,Chaowei Hao,Qiu Chen,Ziqiang Hu,Mengxian Luo,Guoqiao Lai,Tien-Yau Luh
Macrocyclic polysiloxanes are useful materials for the development of interpenetrating polymer networks and thermally stable materials. The main drawbacks of reported methods for the preparation of macrocyclic polysiloxanes are that mixtures of linear and cyclic polysiloxanes are commonly obtained, and complex and time-consuming separation processes are needed. Moreover, the preparation of macrocyclic polysiloxanes occasionally needs harsh conditions, and in general has low efficiency. In this research, we find that highly pure macrocyclic poly(methylvinylsiloxane)s (cPMVSs) can be chemoselectively prepared from 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane with water catalyzed by anhydrous iron(III) chloride in high efficiency. The structure of cPMVSs is characterized by gel permeation chromatography, infrared spectroscopy, 1H- and 29Si-nuclear magnetic resonance (NMR), and viscosity. Thermogravimetric analysis shows that cPMVSs have excellent thermal stability. A metathetical ring-expanding polymerization mechanism is proposed.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
·
IF 5.162
Huifang Wang,Yisheng Zhang,Wenman Xue,Xinyu Zhang,Xiaoli Jia,Tianren Xue,Ruijie Guo,Baolong Niu,Hong Yan
In this contribution, a novel soluble and antibacterial polymer, O-xanthonyl-chitosan (CTMC-Xan), was synthesized successfully by grafting 1,3-dihydroxy-xanthone (Xan) to the side chains of O -carboxymethyl- N , N , N -trimethyl chitosan (CTMC). The chemical structure and physical properties of the polymer were analyzed by 1 H NMR, FT-IR spectra, UV spectra and XRD. The results showed that Xan could covalently bond with the carboxyl groups of CTMC by esterification at a grafting ratio of 9.1%. XRD patterns indicated that CTMC-Xan does not exhibit crystallization. The solubility tests showed that CTMC-Xan was completely dissolved and stable in neutral solution but unstable in acid or basic conditions. Moreover, it was found that the antibacterial activity against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) of CTMC-Xan was much stronger than that of Xan and CTMC, and the minimal bactericidal concentration (MBC) was 125 μg·mL −1 . Due to the enhanced solubility and antibacterial activity, CTMC-Xan could potentially serve as a desirable biomaterial for food and pharmaceutical applications .
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PubMed
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CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Wanchen Zhu,Zhongyang Luo,Feiting Miao,Longyi Liu,Akira Nakayama
Biomass hydropyrolysis (HP) vapor upgrading (VU) is highly promising for producing sustainable aviation fuel, yet challenges remain. This study focused on PdMo/γ-Al 2 O 3 and Mo/γ-Al 2 O 3 catalyzed HP-VU of biomass in a pressurized continuous fixed-bed and the reaction mechanism. The results demonstrated that the introduction of Pd enhanced the hydrodeoxygenation activity through multiple effects, including the generation of surface acidic sites, the formation of oxygen vacancies, and the effect of hydrogen spillover. Beyond this, the effects of upgrading temperature and pressure on the catalytic performance of PdMo/γ-Al 2 O 3 were also investigated. Under optimal conditions of 400 °C and 1.0 MPa, the organic phase achieved a mass yield of 12.03 wt%, with the selectivity of C4+ aliphatic hydrocarbons and monocyclic aromatic hydrocarbons reaching 77.01 %, leading to an HHV of 42.41 MJ/kg and high mass balance (98.71 %). Density functional theory calculations further provided insights into the role of defect sites in facilitating C–O/C=O bond cleavage and the contribution of Pd sites to C C bond activation. By integrating theoretical calculations with model compound experiments, the study revealed the potential reaction pathways including hydrodeoxygenation, hydrogenation, and C C coupling. This study provides practical and theoretical insights into the bimetallic-catalyzed HP-VU process of biomass.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Guo Liu,Shuhao Tian,Chang Li,Yizhi Li,Zhiming Deng,Zhijun Zou,Jiayou Tao,Kun Tao,Hongcen Yang,Xiaoxiang Sun,Fen Li,Erqing Xie,Zhenxing Zhang
Catalytic conversion of polysulfides is regarded as a crucial approach to overcome the chronic challenges from polysulfides shuttling and sluggish redox kinetics. Heterostructure catalysts can synergistically combine the advantages of each component with an interfacial built-in electric field (BIEF), demonstrating outstanding adsorption and catalytic effects. However, the relationship between surface electronic structure and interfacial charge redistribution remains unclear. Here, surface-oxidized MXene/α-Fe 2 O 3 (MXTiO/α-Fe 2 O 3 ) heterostructure is developed as model catalyst to clarify the enhancement mechanism of polysulfides adsorption and conversion. Theoretical and experimental analysis confirms that the modified MXene as an electron acceptor steals partial electrons from α-Fe 2 O 3 through interfacial asymmetric Ti-O-Fe bridge bonds, inducing the spontaneous charge redistribution. The electrons transfer through Ti-O-Fe channels creates electron-deficient Fe sites on the surface, which not only reduces the antibonding orbital electron occupation, leading to strengthening the d -p orbital hybridization between surface Fe and polysulfides, providing a strong sulfur affinity, but also weakens S S bonds for accelerated cleavage. The resulting catalyst enables Li-S batteries with a capacity of 538 mAh g −1 at 5.0C. This investigation establishes a fundamental correlation between interfacial electron delocalization and surface electronic configuration modulation, thereby providing a rational insight for designing advanced heterostructured electrocatalysts in high-performance energy storage/conversion applications.
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RSC Advances
·
2014
·Vol. 5
·期 8
·5674-5679
·
IF 3.708
Gang Wang,Li Peng,Yaochen Zheng,Yanqin Gao,Xuedong Wu,Tianhui Ren,Chao Gao,Jin Han
We describe a novel triethylamine catalyzed S → O acetyl migration reaction for yielding thiol compounds under mild conditions through the formation of a transitional 5-membered ring. A series of epoxy compounds have been transformed into their thiol counterparts which could be used for construction of topological and functional sulfur-containing polymers. The one-pot two-step processes including the S → O acetyl migration and the following thiol-click reactions avoided separation of thiol intermediates. Applying these processes on a new-type latent polythiols overcomes crosslinking problem usually met in preparation of multithiol compounds due to the formation of disulfide bonds.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2025
·
IF 6.2
Ting Liu,Bolu Sun,Chunyan Sang,Hua Cai,Hong Liu,Yuwei Liu,Gengsheng He
In the current work, a modified glassy carbon electrode (GCE) with excellent conductivity was prepared by drop-coating carboxymethyl cellulose (CMC) and multiwalled carbon nanotubes (MWCNTs) on the GCE surface. On this basis, two highly selective molecularly imprinted sensors (MIP@PFDA/modified GCE and MIP@PFOS/modified GCE) were separately obtained by in situ electropolymerization of o-phenylenediamine (o-PD) with perfluorodecanoic acid (PFDA) and perfluorooctanesulfonic acid (PFOS) as templates. Under optimal conditions, sensitive quantification methods in the linearity ranges 0.1–1000 ng/mL (PFDA) and 0.05–900 ng/mL (PFOS) were developed via differential pulse voltammetry using [Fe(CN)6]3–/4– as a redox probe. The detection limit values of PFDA and PFOS were as low as 0.041 and 0.015 ng/mL, respectively. Both sensors also presented great stability and selectivity in coexistence with other interferences. Lastly, three food samples were utilized to verify the validity and applicability with recoveries of 89.97%–112.27%, confirming its potential for per- and polyfluoroalkyl substances (PFASs) monitoring in a complex matrix.
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PubMed
高影响因子
CARBON
·
2025
·
IF 11.6
Heng Zhang,Biao Hu,Yangmin Wu,Minglong Yan,Qinhao Zhang,Wenwu Xu,Wenjie Zhao
Metal corrosion and mechanical wear result in a serious decrease in the service life of marine engineering equipment. Carbon-based quantum dots (CDs) are often used as corrosion inhibitors or lubricants due to their ease of functionalization and quantum size effect. However, the protection efficiency of CDs is limited by weak adsorption capacity, and additional doping of heteroatoms such as N and S is usually needed to enhance the adsorption. Here, Ti 3 C 2 T x quantum dots (MQDs) were synthesized by using two-dimensional Ti 3 C 2 T x sheets containing abundant functional groups on the surface as precursors. The corrosion inhibition efficiency of MQDs with a concentration of 400 mg L −1 reached 94.2 %, and the coefficient of friction and wear rate were reduced by 67.6 % and 83.2 %, respectively, compared with the single NaCl solution. Surface analysis showed that MQDs blocked the penetration of corrosive species via forming a protective film on the steel surface through the formation of Ti–O–Fe coordination bonds. Notably, the thickness of protective film was affected by the pH of solution, reaching a maximum thickness of 215 nm at the NaCl solution with a pH of 7. Finally, density functional theory and molecular dynamics simulations were utilized to deeply reveal the adsorption mechanism of MQDs. This study provides new insights into the role of MQDs as dual-functional additives, which is of great significance in promoting the development of multifunctional marine engineering protective materials.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Cangpeng Shan,Qinwei Jia,Yan Zhang,Guoshuai Liu,Xinyu Hou,Yunchong Wang,Rui Han,Caixia Liu,Weichao Wang,Qingling Liu
Removing industrial source CO through catalytic oxidation and providing heat for denitrification units have significant economic and environmental benefits. Sulfur poisoning of catalysts is the bottleneck to stabilize the system operation. To overcome this problem, we fabricated sulfate modified Pt/TiO 2 by appropriate NH 4 HSO 4 deposition, which survived in the SO 2 environment with the concentration as high as 1000 ppm SO 2 , and exhibited an outstanding stability with over 90% CO conversion at 200 °C for 500 h under a typical steel sintering flue gas condition. Experimental and theoretical explorations confirmed that the electronic structure of PtO x clusters was optimized through Pt-O-S bridges after sulfate modification. The O 2p band center closer to the Fermi level and the smaller energy difference between Pt 5d and O 2p band centers led to more active lattice oxygen of PtO x clusters. The more stable π back bonding between Pt 5d and CO 2p and weaker hybridization between Pt and the π⁎ (Ssp2-Osp2)2 orbital of SO 2 indicated enhanced CO adsorption while weakened SO 2 adsorption on Pt sites. The above factors simultaneously improved the low-temperature activity and sulfur resistance for CO oxidation over sulfate modified Pt/TiO 2 . This work provides new insights for the design of sulfur-resistant catalysts and the understanding on the effect of sulfates on catalytic activity.
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