CRYSTENGCOMM
·
2018
·Vol. 20
·期 8
·1151-1157
·
IF 3.304
Qiangwen Fan,Xiaowei Duan,Hong Yan
The solid state [2 + 2] photocycloaddition of N,N′-diacyl-1,4-dihydropyrazines has been investigated using thiourea as a template to preorient the reactants in the crystalline state in a manner that is beneficial for the [2 + 2] photocycloaddition. The structures of the photoadducts, syn-dimers and cage-dimers, were determined using NMR and single-crystal X-ray diffraction. According to the topochemical principles used to assess the feasibility of solid state photochemical [2 + 2] cycloaddition, topological analysis of cocrystals consisting of the N,N′-diacyl-1,4-dihydropyrazines and thiourea, as well as the syn-dimers, was performed to investigate the influence of packing modes and non-covalent interactions on their solid state photoreactivity. The results showed that the solid state [2 + 2] reactivities of both the N,N′-diacyl-1,4-dihydropyrazines assembled using thiourea and the syn-dimers were controlled by the topochemical orientation of the potentially reactive double bonds and the H-bonding interactions within the adjacent reactive molecules.
研究领域:
有机化学
·
光化学
·
晶体工程
·
超分子化学
·
药物合成
✓ 已验证
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2014
·
IF 2.241
Chunlin Li,Qinbo Wang,Binwei Shen,Zhenhua Xiong,Chuxiong Chen
The solubility of 5,10,15,20-tetrakis(4-chlorophenyl) porphyrin manganese(III) chloride (abbreviated in p -ClTPPMnCl) in N , N -dimethylformamide (abbreviated in DMF) + water solvent mixtures at 293.2–353.2 K were measured. The effects of mass fraction of DMF in the solvent mixtures at 1.00–0.80 on the solubility were studied. The results show that the solubility decreases with the decreasing mass fraction of DMF at constant temperature, and increase with the increasing temperature at constant solvent composition. The experimental data were correlated with Apelblat equation, and the solubilities calculated by the model were in good agreement with experimental observations.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Chang Wang,Yike Wu,Sheng Liu,Liang Zhang,Bi-Feng Liu,Xin Liu
N-glycans that are fluorescently tagged by glycosylamine acylation have become a promising way for glycan biomarker discovery . Here, we describe a simple and rapid method using Fmoc N-hydroxysuccinimide ester (Fmoc-OSu) to label N-glycans by reacting with their corresponding intermediate glycosylamines produced by microwave-assisted deglycosylation . After optimizing reaction conditions, this derivatization reaction can be effectively achieved under 40 °C for 1 h. Moreover, the comparison of fluorescent intensities for Fmoc-OSu, Fmoc-Cl and 2-AA labeling strategies were also performed. Among which, the fluorescent intensities of Fmoc-OSu labeled glycan derivatives were approximately 5 and 13 times higher than that labeled by Fmoc-Cl and 2-AA respectively. Furthermore, the developed derivatization strategy has also been applied for analyzing serum N-glycans, aiming to screen specific biomarkers for early diagnosis of lung squamous cell cancer. More interestingly, the preparation of free reducing N-glycan standards have been achieved by the combination of HPLC fraction of Fmoc labeled glycan derivatives and Fmoc releasing chemistry . Overall, this proposed method has the potential to be used in functional glycomic study.
研究领域:
生物化学
·
医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
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.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Danlian Huang,Hai Huang,Guangfu Wang,Ruijin Li,Ruihao Xiao,Li Du,Wei Zhou,Wenbo Xu
The coexistence of antibiotic resistance genes (ARGs) and antibiotic-resistant bacteria (ARB) in the environment poses a potential threat to public health. In our study, we have developed a novel advanced oxidation process for simultaneously removing ARGs and ARB by two types of iron and nitrogen-doped biochar derived from rice straw (FeN-RBC) and sludge (FeN-SBC). All viable ARB (approximately 10 8 CFU mL −1 ) was inactivated in the FeN-RBC/ peroxymonosulfate (PMS) system within 40 min and did not regrow after 48 h even in real water samples. Flow cytometry identified 96.7 % of dead cells in the FeN-RBC/PMS system, which verified the complete inactivation of ARB. Thorough disinfection of ARB was associated with the disruption of cell membranes and intracellular enzymes related to the antioxidant system. Whereas live bacteria (approximately 200 CFU mL −1 ) remained after FeN-SBC/PMS treatment. Intracellular and extracellular ARGs ( tetA and tetB) were efficiently degraded in the FeN-RBC/PMS system. The production of active species, primarily •OH, SO 4 •- and Fe (IV), as well as electron transfer, were essential to the effective disinfection of FeN-RBC/PMS. In comparison with FeN-SBC, the better catalytic performance of FeN-RBC was mainly ascribed to its higher amount of pyridine-N and Fe 0 , and more reactive active sites (such as C O group and Fe-N sites). Density functional theory calculations indicated the greater adsorption energy and Bader charge, more stable Fe-O bond, more easily broken O O bond in FeN-RBC/PMS, which demonstrated the stronger electron transfer capacity between FeN-RBC and PMS. To encapsulate, our study provided an efficient and dependable method for the simultaneous elimination of ARGs and ARB in water.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FLUID PHASE EQUILIBRIA
·
2017
·
IF 2.473
Tao Jia,Shengshan Bi,Jiangtao Wu
Compressed liquid densities of n -decane + n -dodecane binary mixtures were measured with a vibrating-tube densimeter at temperatures from (283–363) K and pressures from (0.1–100) MPa over the whole range of composition . The binary mixtures n -decane (1) + n -dodecane (2) were prepared at mole fractions of ( x 1 = 0, 0.2297, 0.4436, 0.6433 0.7841, and 1.0), respectively. The experimental densities of binary mixtures were successfully correlated with the Tait-type equation, and the absolute average percentage deviations of the experimental and calculated values were 0.048%, 0.055%, 0.059%, 0.058%, 0.068%, and 0.052%, respectively. In addition, the excess molar volume was calculated for whole range of temperature, pressure and composition.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2016
·Vol. 6
·期 16
·6217-6225
·
IF 5.287
Zuojun Wei,Jiongtao Lou,Zhenbin Li,Yingxin Liu
An efficient catalysis system composed of a Lewis–Brønsted acid mixture and Ru/C using N,N-dimethylformamide as a solvent was developed for the one-pot conversion of fructose to 2,5-dimethylfuran (2,5-DMF) via the dehydration/hydrogenolysis sequence. The effects of various reaction parameters, such as solvent, catalyst type, catalyst loading, reaction pressure, temperature and time, on single fructose dehydration, 5-hydroxymethylfurfural (5-HMF) hydrogenolysis and the one-pot conversion of fructose to 2,5-DMF were systematically investigated. The results showed that 2,5-DMF could be successfully produced with a yield as high as 66.3 mol% by using a one-pot method directly from fructose under the optimized reaction conditions, which is by far the highest yield ever reported for the production of 2,5-DMF from fructose through a one-pot strategy. The Ru/C catalyst could be reused at least three times with a slight decrease in 2,5-DMF yield.
研究领域:
化学工程
·
催化化学
·
可再生能源
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 15
·12638-12648
·
IF 2.22
Zhou Xiaohong,Chen Yongyang,Wang Peiying,Xu Chengyang,Yan Qishe
The AgI/BiPO 4 n–n heterojunction hybrids were favorably fabricated over amorphous particles AgI closely in contact with petty polyhedron-assembled star-like BiPO 4 by precipitation technology for the first time. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–Vis diffuse reflectance spectra (DRS), electrochemical test, etc. The degradation of tetracycline hydrochloride (TC) and methylene blue (MB) was employed to testify the performance of as-prepared composites upon exposure of simulated solar light and the AB-X composites exhibited boosted degradation efficiency in comparison with the as-prepared pure BiPO 4 and AgI. For instance, the calculated k TC of pseudo-first-order kinetics model on 24 wt% AgI/BiPO 4 sample was 36 times relative to those on pure BiPO 4 . This enhanced activity might due to increased charge transfer and separation efficiency in the formed n–n heterojunction and the dominant reaction active species were authenticated by trapping experiments. Furthermore, the internal electric field in the AgI/BiPO 4 heterojunction and the transfer path of electron–holes were tentatively deduced through graphical elucidation.
研究领域:
材料科学
·
环境化学
·
光催化
·
纳米材料
·
半导体异质结
·
污染物降解
·
能源与环境技术
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Zhichao Yang,Weiquan Cai,Jinpeng Zhou,Qing Xia,Tielin Wang
A fast, large-scale, and stable preparation method was successfully developed to obtain η-Al2O3 microspheres with particle sizes of 3–10 μm from cheap and widely sourced NaAlO2 solution using N,N-dimethylformamide (DMF) as a morphological modifier and a precipitant simultaneously at room temperature. The yield of alumina increases from 33.3 to 77.3% by increasing the dose of DMF from 100 to 400 mL. The utilization efficiency of DMF significantly increased by adding fresh NaAlO2 into the reused filtrate after separating the bayerite precipitate (precursor of η-Al2O3). Importantly, the η-Al2O3 microspheres obtained from the filtrate-reuse experiments show the stable phase structures, morphologies, and pore structure properties. Furthermore, the typical η-Al2O3 microspheres supported Pd catalyst presents a higher catalytic activity of 10.6 g/L for the hydrogenation of anthraquinone than that of the commercial γ-Al2O3-supported Pd catalyst (8.5 g/L), suggesting that the as-prepared η-Al2O3 microspheres have good application prospects for catalytic hydrogenation and related fields.
研究领域:
材料科学
·
催化
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yunpeng Zha,Xiaoxiao Sun,Zhengjun Xiong,Dandan Dong,Shili Li,Qinqin Wang,Minmin Liu
The porous carbon materials co-coordinated with Fe and N (Fe-N-C) were successfully synthesized through one-step pyrolysis with the zeolitic imidazolate framework (ZIF-8) as the precursor. Through systematic optimization of iron ion concentration during synthesis, the Fe-N-C-20 specimen exhibited optimal adsorption performance toward dibenzothiophene (DBT), demonstrating a maximum sulfur adsorption capacity of 22.14 mg S/g with a corresponding removal efficiency of 92 %. This superior performance can be primarily ascribed to the formation of Fe-S bonds anchored on Fe-N active sites, N-S interactions mediated by graphitic nitrogen species and appropriate pore size that allows access to thiophenic compounds. Furthermore, the experimental adsorption isotherms for DBT exhibited strong correlation with the Density Functional Theory (DFT) calculation. Additionally, the material's adsorption process followed pseudo-second-order kinetics and Langmuir isotherms of Fe-N-C, and the pseudo-second-order model shows the smallest RMSE (0.66), extremely low SSE (3.03) and AIC (-1.86), which further proves its excellent fitting ability. And the best balance between parameter efficiency and fitting performance. The high stability and recyclability of ZIF-derived Fe-N-C porous adsorbents contribute to sustainable industrial practices.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Jing Li,Kunpeng Gao,Francesco Secundo,Xiangzhao Mao
Chitin, one of the most abundant renewable biopolymers on Earth, is commercially available from crustacean wastes. One critical step in converting chitin to high-value products is its degradation by chitinolytic enzymes to N -acetyl- d -glucosamine (GlcNAc), which plays a significant role in functional food and pharmaceutical industries. Here, we cloned and biochemically characterized two novel β - N -acetylglucosaminidases named SvNag2557 (family-84) and SvNag4755 (family-3) from Streptomyces violascens ATCC 27968. Both SvNag2557 and SvNag4755 exhibited strict substrate specificity toward N -acetyl chitooligosaccharides with GlcNAc as the sole product. Thus, a one-pot production for pure GlcNAc from chitin by an enzyme cocktail reaction was further developed. Under the co-action of an endo-type chitinase SaChiA4 and SvNag2557 (mass ratio 1:2), the final conversion rates of colloidal chitin and ionic liquid pretreated chitin to GlcNAc were 80.2% and 73.8% with GlcNAc purities of 99.7% and 96.8%, respectively.
研究领域:
生物化学
·
生物技术
·
酶学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2017
·
IF 1.753
Yun Bai,Po Yang,Tao Wang,Yi Gu
This work aims at probing the formation of hydrogen bonds in the blends of polybenzoxazines and additional hydrogen-bond donor moieties-containing compounds. Based on experimental study and computer simulations, we found that the dominant hydrogen bonds of p -cresol-aniline-based dimer ( p C-a-D) and polybenzoxazines (P p C-a) were OH⋯N while N,N ′-(pyridine-2,6-diyl)diacetamide (DAA) was NH⋯O C hydrogen bond. After blending p C-a-D or P p C-a with DAA, additional hydrogen bonds formed, i.e. , OH⋯O C and OH⋯ NH. Moreover, the total quantity of hydrogen bonds of the blends increased. These results suggested that hydrogen bonds formed between polybenzoxazines and the additional hydrogen-bond donor moieties-containing polymers or compounds, and furthermore would be desirable to foster the promoted performance. This novel insight about polybenzoxazine blends is anticipated to help researchers explore more blends of polybenzoxazines with excellent properties.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）