TETRAHEDRON
·
2015
·
IF 2.641
Juyou Lu,Hong Wan,Yunna Xue,Yongmei Du,Jian Lu
A convenient and efficient Ni-catalyzed reaction has been developed for synthesis of mono-substituted o -carboranes, involving cross-coupling of readily available and sterically hindered 1-bromomethyl- o -carborane with various alkyl and aryl Grignard reagents under mild conditions, and the corresponding o -carborane derivatives were obtained in good to excellent yields. This method should provide a new strategy for construction of diverse and useful functionalized boron cluster compounds for medicinal chemistry and material chemistry.
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高影响因子
ChemElectroChem
·
2022
·Vol. 9
·期 12
·e202200156
·
IF 4.782
Jing Gao,Xiaolin Sun,Cheng Wang,Yuan Zhang,Li Yang,Depeng Song,Yue Wu,Zewen Yang,Takeo Ohsaka,Futoshi Matsumotoc,Jianfei Wu
Graphical Due to the Sb- and O-cosubstitution , the Li 10 SnP 1.84 Sb 0.16 S 11.6 O 0.4 sulfide electrolyte with high ionic conductivity, broad electrochemical window, and high air stability was prepared for high-performance all-solid-state battery. Electrochemical measurement and postmortem analysis of cycled electrodes results revealed that the mechanism of improving cell stability is the inhibition of electrolyte side reaction in the cathode. Sb- and O-cosubstituted sulfide electrolyte was demonstrated to be a promising solid electrolyte for practical all-solid-state battery. The development of solid-state electrolytes with high ionic conductivity, broad electrochemical stability, and high air stability is the key to realizing the practical application of all-solid-state batteries. Herein, Sb- and O-cosubstituted Li 10 SnP 2 S 12 sulfide electrolytes are prepared for the first time. An appropriate amount of Sb and O substitution provides the optimized Li 10 SnP 1.84 Sb 0.16 S 11.6 O 0.4 electrolyte with the highest ionic conductivity of 2.58 mS ⋅ cm −1 at RT. Furthermore, the cyclic voltammetry analysis results demonstrate that the Li 10 SnP 1.84 Sb 0.16 S 11.6 O 0.4 electrolyte displays a broader electrochemical window of 1.4–5.0 V vs. Li + /Li than that of 1.7–2.4 V vs. Li + /Li for the nonsubstituted Li 10 SnP 2 S 12 . Moreover, benefitting from the soft acid Sb 5+ and hard base O 2− dual substitution, the air stability of electrolyte has been improved. Furthermore, the LiNbO 3 @LiCoO 2 /Li−In cell assembled with the Li 10 SnP 1.84 Sb 0.16 S 11.6 O 0.4 electrolytes exhibits a high initial discharge specific capacity of 124.7 mAh ⋅ g −1 at 0.05 C and maintains 85 % capacity retention after 200 cycles at 0.5 C and 25 °C, which is much higher than that of the cell assembled with the Li 10 SnP 2 S 12 electrolytes. XPS measurement results revealed that the mechanism of improving cell stability is the inhibition of electrolyte side reaction in the cathode. Sb- and O-cosubstituted Li 10 SnP 2 S 12 was demonstrated to be a promising solid electrolyte for practical all-solid-state batteries.
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高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Shidong Song,Yongqiang Xu,Yanli Ruan,Hong Wang,Dequan Zhang,Joykumar Thokchom,Donghai Mei
Amorphous Li–La–Zr–O (LLZO) solid-state electrolyte thin films are promising alternatives to the well-established lithium phosphorus oxynitride (LiPON) electrolyte for all-solid-state lithium batteries due to their potentially higher Li-ion conductivity and stability. Herein, the enhancement methodology in the ionic conductivity of amorphous LLZO-based thin films is investigated. By doping with Ta, the conductivity of the amorphous LLZO film at 30 °C (3.9 × 10–7 S cm–1) can be enhanced by up to an order of magnitude (2.6 × 10–6 S cm–1), ascribed to tuning Li conduction in local near-order LLZO nanodomains. On that basis, an isomeric Li–La–Zr–Ta–O (LLZTO) amorphous–crystalline composite thin film is prepared via incorporating cubic LLZTO particles into the amorphous LLZTO matrix. The composite film with 10 wt % cubic LLZTO filler can further achieve an ionic conductivity of 0.8 × 10–5 S cm–1 at 30 °C, which is comparable to the best values obtained for the state-of-art LLZO-based thin films. Li transport through the well-connected cubic LLZTO filler network and along the interfaces between the crystallites and the amorphous matrix in the LLZTO composite thin film may offer fast and long-range Li-conduction pathways, which supplement the ionic conduction in the amorphous matrix with short-range-ordered and long-range-disordered structures.
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高影响因子
PeerJ
·
2019
·
IF 2.353
Hongli Yin,Ji Ma,Jichun Han,Maoru Li,Jing Shang
Background Quercetin (Qr), isoquercitrin (IQ), and quercetin-3-O-β-D-glucuronide (QG) are powerful phytochemicals that have been shown to exhibit disease prevention and health promotion properties. However, there may exist transformations between Qr, IQ, and QG in vivo . And the pharmacokinetic profiles of Qr, IQ, and QG have not been systematically compared. The pharmacokinetics study would be helpful to better understand the pharmacological actions of them. Methods Herein, we developed a reliable HPLC-MS method to compare the pharmacokinetics of Qr, IQ, and QG after separate (50 mg/kg) oral administration of them in rats, using puerarin as internal standard. The detection was performed using negative selected ion monitoring. This method was validated in terms of selectivity, linearity, precision, accuracy, extraction recovery, matrix effect, and stability; and shows reliabilities in monitoring the pharmacokinetic behaviors of these three compounds. Results Our results showed that after separate oral administration of Qr, IQ, and QG, all of the compounds could be detected in plasma. In addition, QG could be detected in the Qr group; Qr and QG could be measured in the IQ group; and Qr could be found in rat plasma after 1.5 h of QG administration. Moreover, the AUC 0− t of Qr in the; Qr group (2,590.5 ± 987.9 mg/L*min), IQ group (2,212.7 ± 914.1 mg/L*min), and QG group (3,505.7 ± 1,565.0 mg/L*min) was larger than the AUC 0− t of QG in the; Qr group (1,550.0 ± 454.2 mg/L*min), IQ group (669.3 ± 188.3 mg/L*min), and QG group (962.7 ± 602.3 mg/L*min). The AUC 0− t of IQ was the lowest among all groups. Discussion Quercetin, IQ, and QG can all be absorbed into plasma. A mutual transformation exists between Qr and QG, and IQ can be metabolized into Qr and QG in SD rats. These results would provide a meaningful basis for understanding the pharmacological actions of these three compounds.
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DOI
PubMed
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 40
·e202303078
·
IF 2.1
Yixin Tong,E. Mi,Li Zhou,Xiabin Wang,Biao Xiong
Graphical The synthesis of 2-acylindoles from sulfoxonium ylides with o-aminoaryl aldehydes via iridium-catalyzed N−H insertion and intramolecular condensation has been demonstrated. 2-Acylindoles possess widespread applications in functional chemicals. However, the convenient and selective synthesis of such important substructures has to date remained a challenge. Herein, a method to achieve 2-acylindoles from sulfoxonium ylides with o-aminoaryl aldehydes catalysed by Iridium has been developed with the merits of broad substrate scope, good functional tolerance, high efficiency and operational simplicity, which provides an alternative way to access functionalized indoles.
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高影响因子
DYES AND PIGMENTS
·
2018
·
IF 3.767
Xueyan Wu,Jixi Guo,Jianzhang Zhao,Yuanyuan Che,Dianzeng Jia,Yi Chen
The development of organic single-molecule multiple photoluminescence compounds hold a great promise for advanced opt-electronic devices, optical probes and temperature sensors . The pyrenyl-substituted o -carborane, CSP and CDP , were obtained via a modified nickel-catalyzed cross-coupling reaction in satisfactory yields. Based on variety of spectroscopic measurements, it was found that the CSP and CDP exhibit multifunctional luminescent properties, such as dual emissions as well as thermochromic luminescence between orange and blue for CSP , ternary species emissions for CDP , and aggregation induced emission (AIE) and AIE enhancements (AIEE) properties for both. The origination of the multiple photoluminescence attributes was investigated deeply. We demonstrated that the multiple photoluminescence in the pyrenyl-substituted o -carborane rose from the electronic interaction between pyrenyl and o -carboranyl leading to the formation of ICT state, and the mono-molecular excimer emission attributed to the interaction between the conformational of two “face−to−face” pyrene chromophores . In addition, clear thermochromic luminescence properties were caused by ICT at room temperature and excimer formation at 77 K in the solid state. The results are useful as a guideline for designing luminescent solid materials with multiple photoluminescence and thermochromic luminescence properties.
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高影响因子
Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-7
·
IF 2.833
Zhai Haifa,Liu Hairui,Li Hongjing,Zheng Liuyang,Hu Chunjie,Wang Zhao,Qi Jingjing,Yang Jien
The effects of Li/Nb ratio on the preparation of Li-Nb-O compounds by a hydrothermal method were studied deeply. Li/Nb ratio has a great impact on the formation of LiNbO 3 ; the ratio smaller than 3:1 is beneficial to the formation of LiNbO 3 , while larger than 3:1, forms no LiNbO 3 at all and the morphology and chemical bond of Nb 2 O 5 raw material are totally modified by Li ions. The reason can be attributed to the large content of LiOH, which is beneficial to form Li 3 NbO 4 not LiNbO 3 , and also, even if LiNbO 3 particle locally forms, it is easily dissolved in LiOH solution with strong alkalinity. Pure LiNb 3 O 8 powders are obtained with two absolutely opposite Li/Nb ratios: 8:1 and 1:3; the former shows a unique porous and hollow structure, quite different from the particle aggregation (the latter shows). Compared with Li/Nb = 1:3, the 4.2 times higher photocatalytic performance of LiNb 3 O 8 (Li/Nb = 8:1) are observed and it can be attributed to the unique porous and hollow structure, which provides a high density of active sites for the degradation of MB. Compared to LiNbO 3 , the improved photocatalytic performance of LiNb 3 O 8 can be attributed to its layered structure type with the reduced symmetry enhancing the separation of electrons and holes.
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PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2019
·
IF 4.507
Xiaoping Wu,Qiao Zhang,Lungang Chen,Qiying Liu,Xinghua Zhang,Qi Zhang,Longlong Ma,Chenguang Wang
The development of thermally stable Pt-based catalysts with superior performance for propane dehydrogenation reactions remains a daunting challenge. In this study, a series of PtSn-Mg(Zn)AlO catalysts with different Zn and Pt contents were synthesized by the anion-exchange method for the propane dehydrogenation reaction. To investigate the influence of Zn on the reaction performance and the catalyst structure, the prepared catalysts were characterized with several analytical techniques, including XRD , TEM, HRTEM, H 2 -TPD and CO pulse chemisorption . A good propane conversion (initially higher than 55% and averaging 45.2% over a period of 2 h) and propene selectivity (higher than 99%) were obtained experimentally with PtSn-Mg(3Zn)AlO at 550 °C. The results demonstrated that Pt provided the active sites and that Zn was a promoter. The HRTEM and CO pulse chemisorption results indicated that the addition of Zn to the PtSn-MgAlO catalyst can stabilize the dispersion of metal particles and thus inhibit the sintering of Pt particles. Furthermore, the activities of the used catalysts were almost recovered through reaction-regeneration cycles with the burning-off of coke during five cycles.
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高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Yin Zhen-Hua,Liu Xiao-Peng,Wang Jin-Mei,Xi Xue-Feng,Zhang Yan,Zhao Rui-Lin,Kang Wen-Yi
Pleurotus placentodes, a fungus, belongs to the Pleurotaceae family. The aim of the present study was to characterize the structure of a novel polysaccharide from fruiting bodies of P. placentodes (PPp-W) and evaluate its anticoagulant activity in vitro. The high-performance liquid chromatography and GC–MS analysis indicated that PPp-W with a molecular weight of 27.4 kDa was mainly composed of mannose (17.56%), glucose (6.37%), galactose (44.89%), and fucose (1.22%) with a certain amount of 3-O-methyled galactose. SEM, XRD, and AFM combined with Congo red test revealed that PPp-W was an irregular curly sheet with triple-helix conformation. The FT-IR, methylation, and nuclear magnetic resonance analysis indicated that PPp-W contained→6)-α-D-Galp-(1→, →6)-3-O-Me-α-D-Galp-(1→and →2, 6)-α-D-Galp-(1→ as main chain, partially substituted at O-2 and O-6 by non-reducing ends of β-D-Manp-(1→ and β-L-Fucp-(1→ with a small amount of α-1,3-linked-Glcp in backbone. PPp-W could significantly prolong APTT (12.9 ± 0.42 s, p < 0.001) and thrombin time (39.9 ± 0.28 s, p < 0.01) compared with the control group (11.45 ± 0.071 s and 38.05 ± 0.21 s), which showed that PPp-W had anticoagulant activity. These studies suggested that PPp-W was a 3-O-methylated heteroglycan and might be suitable for functional foods and natural drugs as an anticoagulant ingredient, which provided a basis for the application of polysaccharides from P. placentodes.
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DOI
PubMed
高影响因子
JOM
·
2019
·Vol. 72
·期 12
·4288-4295
·
IF 2.305
Zhang Jia-Wei,Li Ying,Ding Yu-Shi,Pan Ke-Feng,Zhao Qing
Poly( o -phenylenediamine) was synthesized in different inorganic acid media, hydrochloric (HCl), nitric (HNO 3 ), and phosphoric acid (H 3 PO 4 ).
The aim was to investigate the protective effect of doped coatings on mild steel in an aggressive environment. The synthesized doped-PoPD products were characterized by x-ray diffractometry, Fourier transform infrared spectroscopy, scanning electron microscopy, and cyclic voltammetry. The inhibition abilities of doped coatings were evaluated by potentiodynamic polarization measurements and electrochemical impedance spectroscopy in 3.5% NaCl solution. In the present article, the lowest corrosion current and highest protection efficiency of the doped polymer were observed for the polymer synthesized in HNO 3 medium. The results showed that good protection of mild steel can be achieved by PoPD coating doped with inorganic acid in 3.5% NaCl solution.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 27
·12081-12090
·
IF 3.591
Meihuan Kang,Yichen Li,Jin Yan,Penghui Shi,Yulin Min,Jinchen Fan,Qunjie Xu
Titanium dioxide (TiO2) has been widely studied because of its stable chemical properties, low cost and non-toxicity. But some of its shortcomings also limit its development, such as a large band gap and weak catalytic ability under visible light. The photocatalytic performance of titanium dioxide has been improved by doping nonmetal boron (B) and noble metal rhodium (Rh) in the current study. In general, a metal's electron-deficient state can be regarded as the active sites in a hydrogen evolution reaction. The electron-deficient state of Rhδ+ contributes to its high ability to grab electrons. The light absorption range of Rh nanoparticles (NPs) can reach the visible light band. TiO2 with special morphology is synthesized by a one-step hydrothermal method, and B-doped titanium dioxide with an oxygen vacancy is obtained by adding a B source into the precursor solution. The influence of nonmetal ion doping on oxygen vacancy is studied. The Rh/B–TiO2-550 photocatalyst is synthesized by depositing Rh NPs onto B–TiO2, and the bifunctional photocatalyst with a visible light response is successfully prepared. The Rh/B–TiO2-550 catalyst shows good performance in the degradation of hydrogen and pollutants produced in the photocatalytic decomposition process. Under the irradiation of a 300 W xenon lamp, the hydrogen production reaches 108.67 μmol in 3 h, and the degradation effect of OPP reaches 99.48%.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Xianjie Wang,Yufei Wang,Long Yan,Qin Wang,Jian Li,Xiang Zhong,Qianqian Liu,Qingchao Li,Shuo Cui,Gang Xie
Heteroatom-doped porous carbon has attracted enormous attention in fabricating high-performance supercapacitors . However, designing heteroatoms containing carbon materials through an eco-friendly and cost-effective route remains challenging. In this work, N-O-S self-doped porous carbon materials are prepared from semi-coking wastewater-based phenolic resin (SWPR) via a simple Na 2 CO 3 activation strategy. The abundant phenols , NH 4 + , and SO 4 2- in semi-coking wastewater endows the versatile N, O, and S doping in porous carbon material, remarkably enhancing its conductivity. The optimal SWPR-700–2.5 porous carbon material is obtained at an activation temperature of 700 °C and a mass ratio of 2.5:1 for SWPR: Na 2 CO 3 . The symmetrical supercapacitor is assembled with SWPR-700–2.5, exhibiting a high specific capacitance of 170.5 F g −1 at 0.5 A g −1 , with a high energy density of 5.92 Wh kg −1 at 124.9 W kg −1 . After 10,000 cycles, the Coulombic efficiency and capacity retention are 100% and 99.4%, respectively, at a current density of 20 A g −1 . The excellent performance of SWPR-700–2.5 based capacitor is attributed to the porous structure with a large specific surface area (718 m 2 g −1 ) and abundant N-O-S self-doping (2.739 at% N, 8.627 at% O and 1.378 at% S). This study provides a simple route to prepare N-O-S self-doped porous carbon for supercapacitors and pushes forward the advancement of semi-coking wastewater treatment.
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高影响因子
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