JOURNAL OF STRUCTURAL CHEMISTRY
·
2023
·Vol. 64
·期 3
·474-485
·
IF 0.8
Li L.,Yuan F.
Abstract Reaction of H 3 salmp (H 3 salmp = 2-bis(salicylidieneamino)methylphenol) and lanthanide ions has afforded three lanthanide-schiff base complexes. One is homodinuclear [Nd(Hsalmp)(NO 3 )(EtOH)] 2 ·2EtOH ( 1 ), other two are heteroleptic tetranuclear [LnNa(salmp)(sal)(EtOH) 3 ] 2 (Ln = Nd ( 2 ), Ce ( 3 ); sal = salicylaldehydato) architectures. In complex 1 , the counter Hsalmp 2– anions adopt NO 3 donor sets, wheras in complexes 2 and 3 , the counter salmp 3– anions select N 2 O 3 donor sets and sal – anions chose O 2 donor sets, in which cleavage of C=N groups in ligand has taken place. The amount of alkali has displayed a vital influence on preparation of these complexes. Both of the complexes were elucidated by elemental analysis, IR, fluorescence spectra and X-ray crystallography.
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高影响因子
Soft Matter
·
2021
·Vol. 17
·期 12
·3494-3502
·
IF 3.679
Wenchang Zhuang,Chunhua Zhao,Yue Pan,Qintang Li
As tailorable solvents, the physiochemical properties of ionic liquids can be tuned by the structure of ions. Herein, we investigate the structural effects of ILs on the self-assembly of surfactants. It has been confirmed that the cationic surfactant 1-hexadecyl-3-methylimidazolium bromide (C16mimBr) can self-assemble into micellar and lamellar lyotropic liquid crystal phases in the aprotic ionic liquid (AIL) 1-ethyl-3-methylimidazolium tetrafluoroborate ([Emim]BF4). In this work, we explore the aggregation behaviours in AILs with different alkyl chains on the imidazolium group, i.e., 1-propyl-3-methylimidazolium tetrafluoroborate ([Pmim]BF4), 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4), 1-hexyl-3-methylimidazolium tetrafluoroborate ([Hmim]BF4) and 1-octyl-3-methylimidazolium tetrafluoroborate ([Omim]BF4). With the increase of the cation chain length, AILs have better solubility of the solvophobic part of the surfactants and hence a weaker driving force for self-assembly. Therefore, the critical micellization concentration of C16mimBr in AILs increases as confirmed by the surface tension and small angle X-ray scattering characterizations. More interesting things happen to the phase behaviours. Besides the micellar and lamellar lyotropic liquid crystal phases, a hexagonal lyotropic liquid crystal phase is formed in [Pmim]BF4 while hexagonal and bicontinuous cubic lyotropic liquid crystal phases are formed in [Bmim]BF4, [Hmim]BF4 and [Omim]BF4. It is surprising to observe richer phase behaviours in solvents of lower cohesive energy. The detailed structural information of various aggregates has been obtained by small-angle X-ray scattering. It is demonstrated that AILs work as not only solvents but also co-surfactants.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2014
·Vol. 41
·期 8
·5809-5819
·
IF 1.54
Zhao Bing,Jiang Lili,Liu Zhuo,Deng Qigang,Wang Liyan,Song Bo,Gao Yan
A microwave-assisted, convenient, efficient, and catalyst-free procedure is described for the synthesis of 1,3-diphenyl-3-(pyridin-2-ylamino)propan-1-one derivatives by Michael addition of 2-aminopyridine to the chalcones. Short reaction times, simple reaction, easy of product isolation, high yields, and clean work-up are the advantages of this method.
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高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 20
·10383-10389
·
IF 9.3
Haibo Zhu,Ting Zhong,Liu Yang,Yajing Shen,Qiangwen Fan,Zhanggao Le,Zongbo Xie
The photocatalytic activation of oxygen molecules (O2) is an environmentally friendly and sustainable alternative to substituted benzofuran-3(2H)-one synthesis. Herein, lead-free Cs2AgBiBr6 nanocrystals were used to activate O2 efficiently and selectively for the photocatalytic transformation of 4-hydroxycoumarins to functional 2-hydroxy-benzofuran-3(2H)-ones under an air atmosphere. Polyfunctionalized benzofuran-3(2H)-ones with a quaternary carbon center can be selectively obtained in moderate to good yields at room temperature via one-pot synthesis. Perovskite crystal structures have significant influence on photocatalytic activity due to the different charge separation abilities. The reaction mechanism was further investigated to confirm the contribution of reactive oxygen species (ROS).
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高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 29
·11430-11438
·
IF 8.262
Hua Tian,Lin Wang,Yang Jiang,Lin Zhang,Yan Li,Li Hou,Cunqi Wu,Faming Gao
Graphene has great potential to significantly enhance the electrochemical activity of redox-active materials for supercapacitors. However, the agglomeration of graphene sheets remains a critical challenge to excellent energy storage performance of hybrid composites supported by graphene. Herein, a facile hydrothermal approach for the synthesis of porous Ni2CO3(OH)2/functionalized graphene (NCB/FGN) composites is developed. To improve the dispersion properties of graphene, sulfonated salicylic acid serving as a functionalized composition is covalently anchored to the surface of functionalized graphene. The systematic investigation indicates that the presence of functionalized graphene plays a crucial role in establishing the porous structure of hybrid composites. Compared to reduced graphene oxide (rGO), functionalized graphene is more beneficial to accommodate the expansion of the surface area and the reduction of the pore length in hybrid composites. The detailed electrochemical characterization demonstrates that the unique porous structure of NCB/FGN composites encompasses the great capability of rapid kinetic diffusion of active ions in electrolytes during the electrochemical reaction. The specific capacitance of NCB/FGN composites is 1508 F g−1 at a current density of 1 A g−1, higher than 1258 F g−1 for NCB/rGO composites and 1039 F g−1 for pristine NCB. After 3000 charge–discharge cycles at a current density of 10 A g−1, the specific capacitance of NCB/FGN composites still approaches their initial capacitance.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Zhenghua Zhang,Jiugang Hu,Yang Hu,Hongmei Wang,Huiping Hu
Ni-rich LiNi x Co y Mn 1−x−y O 2 /graphite batteries with Ni ≥ 0.8 have aroused great interest in high-energy–density Li-ion batteries. However, their practical applications still face huge challenges owing to severe capacity fading on unstable cathodic solid electrolyte interfaces (SEI). Herein, we propose an advanced electrolyte additive , tri(2-furyl)phosphine (FuP), to induce the simultaneous formation of robust SEI films on cathode and anode surfaces. This interphase can significantly improve the cyclability of commercial LiNi 0.8 Co 0.1 Mn 0.1 O 2 /graphite pouch cells at 45 °C and reduce cell impedance during cycling. The capacity retention rate of the cells with the FuP-based electrolyte can reach 90 % after 600 cycles, which is considerably better than that of baseline batteries (70 %). Mechanistic studies indicate that FuP suppresses the formation of fragile Li 2 CO 3 to generate more stable LiF, Li x PO y F z , and additional organic phosphorus species on the electrode surface, thereby preventing cation disorder and irreversible phase transitions. These results provide a facile and efficient strategy for enhancing the performance of Ni-rich Li-ion batteries.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Zhou-Yang Li,Min Li,Bin Liu,Xue-Ning Zhang,Shan Yi,Wei-Qin Zhuang,Wen Wang,Yi-Lu Sun,Ai-Jie Wang
Microbial anaerobic metabolism is crucial for biogeochemical cycles, impacting both natural and engineered ecosystems. However, the increasing emissions of 6:2 Cl-PFESA, an alternative to PFOS, pose significant risks. In this study, long-term high 6:2 Cl-PFESA concentration level of 10 µg/g TS exposure led to a substantial decrease in methane production from 204.8 ± 4.8 mL/g VS to 143.6 ± 3.5 mL/g VS, indicating a cumulative inhibitory effect on carbohydrate-related anaerobic digestion. Key processes such as polysaccharide release, hydrolysis, acetogenesis, and acetoclastic methanogenesis were contributed by 28.6 %, 9.3 %, 8.9 %, and 11.7 % of significant reduction, respectively, correlating with inhibition in relevant enzymatic activities and gene expressions. Hydrolytic bacteria such as Rectinema and Defluviitoga declined to 11.7 % from 14.3 % and 20.9 % from 23.9 %, reflecting decreased hydrolysis efficiency. Reduced transcription levels of acetogenesis- and acidogenesis-related genes further inhibited these processes. Conversely, methanogens Methanolinea and Methanothrix increased from 35.8 % to 55.7 % and 10.9–40.8 %, suggesting enzyme inhibition rather than methanogen abundance reduction. Additionally, 6:2 Cl-PFESA partially biotransformed into 6:2H-PFESA, facilitated by species like Dechloromonas , unclassified Xanthomonadales , and Betaproteobacteria. These findings confirm that the limited degradation and cumulative inhibitory effects of 6:2 Cl-PFESA during anaerobic digestion highlight its significant disruption to carbon cycling stability within ecosystems.
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PubMed
高影响因子
Journal of Environmental Sciences
·
2010
·
IF 1.412
Shuyan Zang,Bin Lian,Juan Wang,Yanjie Yang
To explore biodegradation of 2-naphthol and its metabolites accumulated in wastewater treatment, a series of bio-degradation experiments were conducted. Two main metabolites of 2-naphthol, 1,2-naphthalene-diol and 1,2-naphthoquinone, were identified by high-performance liquid chromatography with standards. Combining fungus Aspergillus niger with bacterium Bacillus subtilis in the treatment enhanced 2-naphthol degradation efficiency, lowered the accumulation of the two toxic metabolites. There were two main phases during the degradation process by the kinetic analysis: 2-naphthol was first partly degraded by the fungus, producing labile and easily accumulated metabolites, and then the metabolites were mainly degraded by the bacterium, attested by the degradation processes of 1,2-naphthalene-diol and 1,2-naphthoquinone as sole source of carbon and energy. Sodium succinate, as a co-metabolic substrate, was the most suitable compound for the continuous degradation. The optimum concentration of 2-naphthol was 50 mg/L. The overall 2-naphthol degradation rate was 92%, and the COD Cr removal rate was 80% on day 10. These results indicated that high degradation rate of 2-naphthol should not be considered as the sole desirable criterion for the bioremediation of 2-naphthol-contaminated soils/wastewater.
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PubMed
高影响因子
ACS Applied Optical Materials
·
2025
·
IF 3.8
Yan Zhang,Junzhe Wang,Liang Li,Honggang Zhang,Bei Li,Xiangxiang Zhang,Zeyan Wang,Yuanyuan Liu,Peng Wang,Hefeng Cheng,Ying Dai,Baibiao Huang,Zhaoke Zheng
The design of organic–inorganic heterojunctions can facilitate the separation of photoinduced charge carriers by modulating the electronic structure at the surface and interface states, showing promising applications in the field of photocatalytic CO2 cycloaddition. However, the details of the surface/interface effects between these two components are still poorly understood. Herein, Cu2O@Cu3(HHTP)2 (HHTP = 2, 3, 6, 7, 10, 11-hexahydroxytriphenylene) heterojunctions were synthesized, where Cu2O nanoparticles (NPs) featuring distinct crystal facets were utilized as substrates for the in situ growth of the copper-based metal–organic framework (Cu3(HHTP)2). Among them, t-Cu2O@Cu3(HHTP)2, centered on t-Cu2O with {111} and {100} facets, exhibits superior performance toward photocatalytic CO2 cycloaddition to chlorinated propylene carbonate, with a conversion efficiency of 372 mmol g–1 h–1 under light. Notably, single-particle spectroscopy reveals a more efficient photogenerated carrier transfer between t-Cu2O and Cu3(HHTP)2. The results confirm that crystalline facet dependence is a key factor in semiconductor photocatalysis and an important strategy for optimizing the reactivity of photocatalysts, which provides a way to improve the photocatalytic CO2 cycloaddition performance by modulating the interfacial states of organic–inorganic heterojunction structures.
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高影响因子
JOURNAL OF NATURAL PRODUCTS
·
2025
·
IF 3.6
Xijian Wu,Zijie Su,Biling Huang,Xin Peng,Xing Zhang,Shaohua Huang
The detection and analysis of chiral molecules have long been challenging in analytical chemistry. This study introduces a novel approach that utilizes 2-trifluoromethyl benzaldehyde as a small-molecule probe capable of forming a stable Schiff base with chiral amino acids in aqueous solution under alkaline conditions. The amino acid Schiff bases present a strong Cotton effect and UV absorption at wavelengths exceeding 260 nm, enabling chiral analysis, including assignment of absolute configuration, enantiomeric composition, and total concentration. An application of this method was the authentication of the herbal medicine Ophiopogon japonicus. Using principal component analysis and orthogonal partial least squares discriminant analysis, we successfully differentiated O. japonicus samples collected in two distinct locations with 20 samples. This rapid and convenient method offers a new approach to quality control of herbal medicine.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Huifang Xu,Na Du,Yawen Song,Shue Song,Wanguo Hou
Single-tailed short-chain alkyl keto-acids/salts, a class of fatty acid/salt derivatives, such as sodium 2-ketooctanate (KOCOONa), are a kind of weakly acid/salt type amphiphiles and plausible prebiotic molecules, and the current understanding of their aggregation behavior in aqueous solutions is still limited. Herein, the aggregation behavior of KOCOONa in aqueous solution was studied by changing its concentration ( C ), using equilibrium surface tension, conductivity, and fluorescence measurements. The aggregates formed were characterized using freeze-fracture and cryogenic transmission electron microscopy, dynamic light scattering, atomic force microscopy, and confocal laser scanning microscopy. A concentration-driven stepwise aggregation was identified in the KOCOONa solution. Vesicles can spontaneously form from the single-component aqueous solution, with a critical vesicle concentration (CVC) of ∼15 mM, which is obviously lower than that of octanoic acid/salt (120–200 mM). With increasing C , a vesicle-to-micelle transition can occur, showing a critical micelle concentration (CMC) of ∼80 mM. In addition, the membrane permeability of the KOCOONa vesicles was examined using small-size Calcein and large-size FITC-BSA as fluorescence probes, showing a size-selective permeability, similar to short-chain (C8-C11) fatty acid vesicles. For the first time, the aggregation behavior of single-tailed keto-acid salt surfactant is reported.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Guohui Tang,Haoxiang Wang,Dianwen Liu,Zhao Xie,Peilun Shen,Jinpeng Cai,Jianjun Fang
Azurite is an important oxidized copper mineral, and the traditional sulfidation-xanthate flotation process still fails to achieve ideal results. Organic chelating reagents containing donor atoms such as N, S, and O have demonstrated excellent performance in mineral flotation and copper corrosion inhibitor research. However, such reagents have rarely been applied in azurite flotation studies. This study introduces a novel N/S – containing activator, 2-mercaptopyridine (2-MP), for azurite activation, and investigates its modification mechanism and flotation effects on azurite. Micro-flotation tests show that 2-MP significantly improves azurite's flotation performance. The flotation recovery of azurite in the 2-MP-potassium butyl xanthate system increased substantially from 37.54% to 97.23%. Theoretical studies reveal that 2-MP activates the azurite surface to form a dense product layer containing S/N elements. This S/N – enriched hydrophobic layer facilitates effective xanthate adsorption, thereby enhancing flotation recovery. The activation mechanism is elucidated as follows: The N/S atoms in 2-MP interact with copper sites on the azurite surface, forming 2-MP-Cu complexes containing S-Cu and N-Cu bonds that adsorb onto the mineral surface, exposing more copper sites. Simultaneously, Cu(II) is reduced to highly active Cu(I), providing a fresh active surface that greatly promotes xanthate adsorption while improving the mineral's hydrophobicity and floatability. This work reveals the surface modification mechanism of the bidentate organic chelating reagent 2-MP on azurite, offering a new approach for the efficient utilization of oxidized copper mineral resources.
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