RSC Advances
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2013
·Vol. 4
·期 5
·2360-2367
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IF 2.562
Jin-Quan Wang,Wei-Guo Cheng,Jian Sun,Tian-Yuan Shi,Xiang-Ping Zhang,Suo-Jiang Zhang
Several novel 2-hydroxymethyl-functionalized ILs act as the catalysts for synthesis of cyclic carbonates from CO2 and epoxides without the use of any co-catalysts or organic solvent. Moreover, the 2-hydroxymethyl-functionalized ILs were compatible with base, which combined with K2CO3 were used as effective catalytic system for green synthesis of dimethyl carbonate from CO2via ethylene carbonate without catalyst separation. Additionally, the mechanistic details of the fixation of CO2 into cyclic carbonate catalyzed by 2-hydroxymethyl-functionalized ILs were also elucidated by density functional theory. The process reported here represents a simple, ecologically safer, cost-effective and energy-saving route to organic carbonates from CO2.
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SYNTHETIC COMMUNICATIONS
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2015
·
IF 0.929
Yan Lin,Zhijie Fu,Tianhua Shen,Fengfeng Che,Qingbao Song
An efficient catalyst-free synthesis of 3′-benzoyl-4′,5′-diphenyl-2H-spiro[acenaphthylene-1,2′-pyrrolidin]-2-one derivatives via one-pot 1,3-dipolar cycloaddition of acenaphthenequinone, arylmethyl amines, and chalcones with high regioselectivity is described. The structure of the cycloadducts were characterized by infrared, high-resolution mass spectrometry (electrospray ionization), 1H NMR, and 13C NMR spectra, and the structure of 4a was confirmed using x-ray single-crystal structure analysis.
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JOURNAL OF NON-CRYSTALLINE SOLIDS
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2015
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IF 1.766
Qiang Zhang,Ye Sheng,Keyan Zheng,Xuming Qin,Pingchuan Ma,Haifeng Zou
In this paper, a series of novel inorganic/organic rare earth (europium, terbium) hybrid materials through 2-phenylmalonic acid linkage were synthesized by the sol–gel process. The micro-structure and the luminescent properties of the complicated hybrids were studied in detail by Fourier transform infrared spectroscopy , wide angle x-ray diffraction, themogravimetric analysis, scanning electron microscope, and fluorescence spectra. The above research results indicate that the hybrids possess high thermal-stability, amorphous structure features and especially favorable luminescent performances such as long luminescent decay lifetime, and high quantum yield.
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RSC Advances
·
2015
·Vol. 5
·期 29
·22419-22425
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IF 3.84
Kanjun Sun,Miaomiao Dong,Enke Feng,Hui Peng,Guofu Ma,Guohu Zhao,Ziqiang Lei
A novel gel polymer, polyvinyl alcohol-orthophosphoric acid-2-mercaptopyridine (PVA-H3PO4-PySH), is prepared through introducing redox-mediated 2-mercaptopyridine into a polyvinyl alcohol-orthophosphoric acid host, and a solid state supercapacitor is fabricated using the gel polymer as an electrolyte and a separator and using activated carbons as electrodes. The PVA-H3PO4-PySH gel polymer was shown to have excellent stretching and bending properties. The electrochemical properties of the supercapacitor are investigated by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy. Surprisingly, electrode specific capacitance (1128 F g−1) and energy density (39.17 W h kg−1) are increased by 447% by introducing PySH as the redox mediator in the PVA-H3PO4 gel polymer. The supercapacitor with the PVA-H3PO4-PySH gel polymer shows an excellent capacitance retention of 80% for over 1000 cycles. Simultaneously, the ionic conductivity of the gel polymer electrolyte increased by 92% up to 22.57 mS cm−1 compared to that of the PVA-H3PO4 system. These improved performances are owed to the redox reaction between 2-mercaptopyridine (PySH) and 2,2′-bipyridine (PySSPy) redox couples in the PVA-H3PO4-PySH gel electrolyte, indicating the supercapacitor combines the double-layer characteristic of carbon-based supercapacitors and the faradaic reactions characteristic of batteries' energy-storage processes.
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Scientific Reports
·
2014
·Vol. 4
·期 1
·1-7
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IF 5.078
Parhira Supawadee,Zhu Guo-Yuan,Jiang Ren-Wang,Liu Liang,Bai Li-Ping,Jiang Zhi-Hong
Two stereoisomeric cardenolides, uscharin (1) and a new compound, 2′- epi -uscharin (2), were isolated from the latex of Calotropis gigantea (Asclepiadaceae). Their structures were fully elucidated based on their spectroscopic data, X-ray crystallographic data and chemical evidences. Both epimers (1 and 2) exhibited strong inhibitory effects on HIF-1 activity with different magnitudes. Compound 1 showed much more potent activity than 2 and digoxin, a well-known HIF-1 inhibitor. Discrepancy in potencies between 1 and 2 revealed the contribution of a β-configuration of 2′ hydroxyl moiety for HIF-1 inhibitory activity. This is a first report of the activity of HIF-1 inhibition of thiazoline ring-containing cardenolides.
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Journal of Physical Chemistry C
·
2015
·
IF 4.772
Yejun Zhang,Lun Li,Delu Li,Qiangbin Wang
Alloying nanocrystals with multicomponent has been an effective way to tune the band gap of semiconductor nanocrystals, which promises their wide applications in optoelectronics, photovoltaics, etc. However, colloidal synthesis of homogeneous phase multicomponent nanocrystals in a large scale remains great challenge. Here, we declare the successful preparation of single-crystalline quaternary CuSb(SxSe1–x)2 nanosheets in a facile one-pot reaction with yield >3 g. The molar ratio of S/(S + Se) in CuSb(SxSe1–x)2 could be easily tuned from 1.5% to 13.7% by increasing the reaction temperature which enhances the reactivity of S source in the reaction, and accordingly, the band gap of the obtained CuSb(SxSe1–x)2 varies from 0.9 to 1.1 eV.
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Journal of Energy Chemistry
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2015
·
IF 2.352
Xianxiang Liu,Hui Ding,Qiong Xu,Wenzhou Zhong,Dulin Yin,Shengpei Su
A mild and simple process for the effective oxidation of 5-hydroxymethylfurfural (HMF) into 2,5-diformylfuran (DFF) has been developed using NaNO 2 as the oxidant. Some important reaction parameters were investigated to optimize the oxidation of HMF into DFF. It was found that the reaction solvent was very crucial for this reaction. Trifluoroacetic acid was the best solvent for the oxidation of HMF into DFF by NaNO 2 . Under the optimal reaction condition, almost quantitative HMF conversion and high DFF yield of 90.4% were obtained after 1 h at room temperature.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 27
·期 6
·5735-5740
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IF 1.798
Liu Chang,Liu Yunfei,Lyu Yinong,Lyu Chongguang
Octahedra-like NaNd(MoO 4 ) 2 microcrystals with tetragonal scheelite-type structure were successfully synthesized by a low cost molten salt method using halons (NaCl or NaBr) as flux. The as-prepared products were characterized by powder X-ray diffractometer, field emission-scanning electron microscope and photoluminescence spectrometer (PL). The results show that the reaction parameters including calcining temperature, reaction time, and the type of salt play important roles on the morphologies and sizes of the NaNd(MoO 4 ) 2 microcrystals. The excitation spectra of the NaNd(MoO 4 ) 2 octahedron-like crystals were observed with a maximum peak at 585 nm (λ em = 1066 nm). The emission spectra were recorded under excitation wavelength of 585 nm and exhibit the strongest peak at 1066 nm. In addition, the results revealed the size effect on the PL intensity of NaNd(MoO 4 ) 2 crystals, that the PL intensity of microcrystals is higher than that of nanocrystals. These imply that NaNd(MoO 4 ) 2 microcrystals have potential application in the field of solid state laser materials.
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RSC Advances
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2016
·Vol. 6
·期 25
·20761-20771
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IF 3.289
Weiwei Zhang,Delong Zhang,Xiaoshan Fan,Guangyue Bai,Yuming guo,Zhiguo Hu
Four new Y-shaped miktoarm amphiphilic copolymers were synthesized by ring-opening polymerization (ROP) and click chemistry. The structure of these copolymers was determined by nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FT-IR) and gel permeation chromatography (GPC). The stereocomplexes were prepared by an evaporation method and confirmed by FT-IR, differential scanning calorimetry (DSC) and X-ray diffraction (XRD). Further the aggregation behaviors of these synthesized polymers and their stereocomplexes were studied by fluorescence spectroscopy (PL), transmission electron microscopy (TEM) and light scattering (LS). Their critical micelle concentrations (CMC) obtained by PL were 0.005 mg mL−1 for MPEG1.9k–(scPLA4.5k)2 and 0.039 mg mL−1 for MPEG5k–(scPLA4.5k)2. The aggregation morphologies of homochiral copolymers were worm-like aggregates, while for the stereocomplexes, the spherical micelles were visually observed. The biocompatibility of these copolymers and their stereocomplexes was evaluated with relatively lower cytotoxicity. Finally, the release of doxorubicin (DOX) encapsulated into the micelles in buffer at pH 5.4 was faster than that at pH 7.4. This study demonstrates that the DOX-loaded stereocomplex micelles could be a potential carrier for cancer treatments.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2016
·
IF 3.014
Yong Cui,Zhe Zhang,Xu Du,Wei Liu,Shi Liu,Yulin Deng,Xiaogu Huang,Gang Wang
Hybrid solution process is a powerful liquid deposited strategy merging the advantage of molecular precursor solution and nanocrystals ink. A novel hybrid solution approach is presented to fabricate Cu(In,Ga)(S,Se) 2 (CIGSSe) absorber layer using fully dissolved CIGS precursor solution and the CIGS nanocrystals. Such attractive strategy could significantly improve the single deposited thickness and enhance the quality of as-prepared CIGS film compared with the pure CIGS molecular precursor solution and the CIGS nanocrystals ink. Photovoltaic absorber layers based on CIGSSe chalcopyrite structure show the high-quality microstructural performance and are incorporated into solar cells with power conversion efficiency of 10.19%. The high performance of resulted optoelectronic devices represents a chance to extend the hybrid solution process to other inorganic semiconductor thin film solar cells.
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CHEMICO-BIOLOGICAL INTERACTIONS
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2016
·
IF 2.618
Xiaonan Zhang,Kang Chen,Bo Wei,Xingwang Liu,Zeming Lei,Xizhuang Bai
Glucocorticoid-induced osteoporosis (GIOP) is the primary cause of secondary osteoporosis and the existing therapeutic strategies are limited. The aim of this study is to evaluate the effects of ginsenosides (GS) Rg3 on dexamethasone (DEX)-induced osteoporosis in vivo and in vitro. GIOP rat was established by DEX injection for 5 weeks and treated by GS Rg3 10 or 20 mg/kg. Body weight and bone mineral density (BMD) of rats were measured at the beginning and the end of the experiment. Histological changes of femurs were observed using HE staining. The in vitro model was established on primary osteoblasts induced by DEX. CCK-8 assay was used to test the cell viability. Bone metabolism markers in serum or primary osteoblasts were detected using biochemical kits. Real time PCR and western blot were used to measure nuclear factor-kappa B ligand (RANKL), osteoprotegerin (OPG), bone morphogenic protein-2 (BMP-2), BMP receptor 1A (BMPR1A) and Runx2 expression. The results demonstrated that GS Rg3 prevented DEX-induced body weight and BMD reduction, enhanced secretion of bone formation markers and decreased bone resorption markers. In addition, GS Rg3 was found to prevent the suppression of BMP-2/BMPR1A/Runx2 signals induced by DEX both in GIOP rats and primary osteoblasts. Inhibition of BMP-2 by noggin completely blocked the bone-alkaline phosphatase-secretion-promoted effect of GS Rg3 in vitro. These data suggest that GS Rg3 attenuates GIOP through regulating BMP-2 signaling pathway. This study provides a potential drug candidate for GIOP therapy.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Song Li,Junhui Pan,Guowen Zhang,Jianjian Xu,Deming Gong
In this study, the interaction between di-(2-ethylhexyl) phthalate (DEHP) and calf thymus DNA (ctDNA) was investigated by a combination of multispectroscopic methods, chemometrics algorithm, cyclic voltammetry and molecular simulation. The concentration profiles of the components obtained from resolving the UV–vis absorption data by multivariate curve resolution–alternating least-squares (MCR–ALS) provided a basic evidence for the formation of DEHP–ctDNA complex. Furthermore, the groove binding of DEHP to ctDNA was evidenced by the results from iodide quenching effect, single-stranded DNA quenching effect, melting studies, viscosity measurements and cyclic voltammetry. The binding constant of the complex was in the order of magnitudes of 10 4 L mol −1 , and hydrophobic forces were inferred to drive the binding process. Analysis of Fourier transform infrared spectra suggested that DEHP preferentially bound to A–T rich region of ctDNA in the minor groove, and these results further confirmed by molecular docking. The circular dichroism spectra indicated that DEHP induced a decrease in base stacking degree and an increase in right-handed helicity of ctDNA, but did not cause a significant damage in DNA. This study may improve the understanding of interaction between DEHP and ctDNA and help evaluate the toxicological effect of DEHP.
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