中国化学快报

Select

Design and synthesis of DPP-4 inhibitor for the treatment of type 2 diabetes

Peng Cho Tang, Zhi Gang Lin, Yang Wang, Fang Long Yang, Qian Wang, Jian Hong Fu, Lei Zhang, Ai Shen Gong, Jing Jing Luo, Jun Dai, Gao Hong She, Dan Dan Si, Jun Feng

中国化学快报. 2010, 21(03): 253-256. https://doi.org/10.1016/j.cclet.2009.11.014

摘要 ( )

PDF全文 ( )

可视化

An efficient stereoselective synthesis of the rigid aza-bicyclo[3.2.0]heptane scaffold has been developed to provide 2-cyano-pyrrolidine alpha-amino amide 1 as DPP-4 inhibitor.

Select

Synthesis and antibacterial activity of 4"-O-carbamoyl analogs of clarithromycin

Xue Cui Shen, Bo Jiao, Shu Tao Ma

中国化学快报. 2010, 21(03): 257-260. https://doi.org/10.1016/j.cclet.2009.11.023

摘要 ( )

PDF全文 ( )

可视化

A series of novel 4"-O-carbamoyl analogs of clarithromycin were synthesized and evaluated for their in vitro antibacterial activity. All of the desired compounds showed excellent activity against erythromycin-snsceptible S. pneumoniae, Particularly, 4-fluorobenzyl carbamate 7a demonstrated potent activity against erythromycin-resistant S. pneumoniae encoded by the mef gene, and remarkably improved activity against erythromycin-resistant S. pneumoniae encoded by the erm gene, and the erm and mef genes.

Select

Oxa-Pictet-Spengler reaction in water. Synthesis of some (±) 1-aryl-6,7-dimethoxyisochromans

Aamer Saeed

中国化学快报. 2010, 21(03): 261-264. https://doi.org/10.1016/j.cclet.2009.11.009

摘要 ( )

PDF全文 ( )

可视化

An acid catalyzed oxa-Pictet-Spengler reaction ‘on water’ leading to the synthesis of a variety of 1-aryl-6,7-dimethoxyisochro-mans is described. The aqueous chemistry is a much cleaner, efficient, cheaper and simple method for synthesis. The scope of reactions was extended to thia-Pictet-Spengler reaction to afford the some isothiochromans.

Select

Imino Diels-Alder reactions: One-pot synthesis of tetrahydroquinolines

Vinod T. Kamble, Bhaskar S. Davane, Sanjay A. Chavan, Dnyanoba B. Muley, Sandeep T. Atkore

中国化学快报. 2010, 21(03): 265-268. https://doi.org/10.1016/j.cclet.2009.11.016

摘要 ( )

PDF全文 ( )

可视化

An efficient synthesis of tetrahydroquinoline derivatives is reported via three component coupling reactions of aldehydes and anilines with various dienophiles in the presence of a catalytic amount of perchloric acid adsorbed on silica gel (HClO₄-SiO₂) under mild reaction conditions.

Select

H₃PMo₁₂O₄₎catalyzed three-component one-pot synthesis of 4,6-diarylpyrimidin-2(1H)-ones under solvent-free conditions

Zeinab Pourghobadi, Fatemeh Derikvand

中国化学快报. 2010, 21(03): 269-272. https://doi.org/10.1016/j.cclet.2009.11.003

摘要 ( )

PDF全文 ( )

可视化

4,6-Diarylpyrimidin-2(1H)-one derivatives have been synthesized from three-component one-pot condensation of acetophe-none derivatives, aldehydes and urea in the presence of trimethylsilyl chloride and a catalytic amount of H₃PMo₁₂O₄₀ under solvent-free conditions.

Select

Selective cleavage of phenolic tert-butyldimethylsilyl ethers using simple organic nitrogen bases

Jian Rong Zhu, Ji Jun Xue, Wen Ze Li, Xue Song Chen, Ying Li

中国化学快报. 2010, 21(03): 273-276. https://doi.org/10.1016/j.cclet.2009.11.049

摘要 ( )

PDF全文 ( )

可视化

Simple organic nitrogen bases, such as Et₃N, pyridine, DBU, etc., were found to be convenient and useful reagents for deprotection of TBDMS groups on acidic hydroxyl groups. The efficiency of these bases has an apparent order: 1°amine > 2°amine > 3°amine and aliphatic base>aromatic base. In aqueous DMSO and at room temperature, phenolic TBDMS ethers were removed selectively in the presence of alcoholic TBDMS ethers. And catalytic base can make these reactions complete. This method is high-yielding, fast, clean, safe and cost-effective.

Select

Synthesis of a new pyridine-containing diamine and related polyimide

Jiu Jiang Zhao, Chen Liang Gong, Shu Jiang Zhang, Yu Shao, Yan Feng Li

中国化学快报. 2010, 21(03): 277-278. https://doi.org/10.1016/j.cclet.2009.11.004

摘要 ( )

PDF全文 ( )

可视化

A new kind of aromatic diamine monomer containing pyridine unit, 2,6-bis[4-(4-aminophenoxy)phenoxy]pyridine (BAPP), was synthesized in three steps, using hydroquinone as starting material. A novel pyridine-containing polyimide was prepared from the resulting diamine BAPP with 4,4'-oxydiphthalic anhydride (ODPA) via a conventional two-step thermal imidization method. The resulting polyimide exhibits excellent solubility, film-forming capability and high thermal resistance.

Select

A selective reflecting film with a temperature-dependent pitch length

Xiao Tao Yuan, Hui Cao, Zhou Yang, Huai Yang

中国化学快报. 2010, 21(03): 279-282. https://doi.org/10.1016/j.cclet.2009.11.005

摘要 ( )

PDF全文 ( )

可视化

A (polymer network/liquid crystal/chiral dopants) composite exhibiting a temperature-sensing switch of infrared spectrum has been developed. Because of the different change of the chiral dopant in the helical twisting power and the anchoring effect of the polymer network, the polymer stabilized liquid crystal (PSLC) films, of which the bandwidth of the selective reflection spectra increased with changing temperature, were obtained.

Select

Synthesis and plant-growth regulatory activities of novel imine derivatives containing 1H-1,2,4-triazole and thiazole rings

Xue Qin, Hai Bo Yu, Hong Dai, Zhen Fang Qin, Xin Zhang, Gui Fang Bing, Ting Ting Wang, Jian Xin Fang

中国化学快报. 2010, 21(03): 283-286. https://doi.org/10.1016/j.cclet.2009.11.007

摘要 ( )

PDF全文 ( )

可视化

Eleven new imine derivatives 6 containing 1H-1,2,4-triazole and thiazole rings were synthesized by the condensation of 5-((1H-1,2,4-triazol-1-yl)methyl)-4-tert-butylthiazol-2-amine with various substituted benzaldehydes. The structures of the title com-pounds were characterized by ¹H NMR, MS and elemental analysis. The plant-growth regulatory activities of these compounds were evaluated. The primary bioassay results indicated that these target compounds exhibited promising plant-growth regulatory activities.

Select

A practical synthesis of sarpogrelate hydrochloride and in vitro platelet aggregation inhibitory activities of its analogues

Guo Hua Chen, Sheng Wang, Fei Hua Wu

中国化学快报. 2010, 21(03): 287-289. https://doi.org/10.1016/j.cclet.2009.11.030

摘要 ( )

PDF全文 ( )

可视化

A convenient approach for the preparation of sarpogrelate hydrochloride was developed. Two series of sarpogrelate hydrochloride analogues were designed and synthesized in order to improve their platelet aggregation inhibitory activities, biological tests suggested that these compounds have platelet aggregation inhibitory activities to some extent.

Select

Synthesis and anti-HBV activity of novel 5-substituted pyridin-2(1H)-one derivatives

Yi Kai Zhang, Zhi Liang Lv, Chun Juan Niu, Ke Li

中国化学快报. 2010, 21(03): 290-292. https://doi.org/10.1016/j.cclet.2009.10.010

摘要 ( )

PDF全文 ( )

可视化

Four novel 5-substituted pyridine-2(1H)-one derivatives were designed and synthesized by using addition-elimination reactions. The structures of these novelly synthesized compounds were verified by ¹H NMR, ESI-MS and single crystal X-ray diffraction. Furthermore, all four compounds (most notably compound 7a) were found to be highly efficient against hepatitis B virus (HBV) in cultured HepG22.2.15 cell, making them promising drug candidates for potential bioactive molecule against hepatitis B.

Select

Synthesis and bioactivity of a novel series of 3,6-disubstituted 1,2,4-triazolo[3,4-b]-1,3,4-thiadiazoles

Ying Jun Li, Li Jun Liu, Kun Jin, Yong Ting Xu, Su Qin Sun

中国化学快报. 2010, 21(03): 293-296. https://doi.org/10.1016/j.cclet.2009.11.008

摘要 ( )

PDF全文 ( )

可视化

A novel series of 3,6-disubstituted 1,2,4-triazolo[3,4-b]-1,3,4-thiadiazoles were synthesized by the condensation of 4-amino-5-[2-(4-chlorophenoxymethylbenzimidazole)-1-methylene]-3-mercapto-1,2,4-triazole with various (un)substituted aromatic acids in the presence of phosphorous oxychloride. These compounds were investigated for their inhibitory activity to E. coli methionine aminopeptidase (EcMetAP1). Some of the tested compounds showed significant inhibitory activity.

Select

Synthesis and CDK2 kinase inhibitory activity of 7/7'-zaindirubin derivatives

Zhao Hui Wang, Ying Dong, Tao Wang, Ming Hong Shang, Wei Yi Hua, Qi Zheng Yao

中国化学快报. 2010, 21(03): 297-300. https://doi.org/10.1016/j.cclet.2009.11.029

摘要 ( )

PDF全文 ( )

可视化

A series of novel 7'-azaindiruubin (1a-g) and 7-azaindirubin (2a, 2c, 2e and 2f) derivatives were designed and synthesized. Their structures were characterized by ¹H NMR and MS spectroscopy as well as by elemental analysis. Their inhibitory properties against CDK2/cylinA were evaluated in vitro. In contrast to indirubin, some of the described azaindimbins emerged as potent inhibitors of CDK2/cylinA and compound 2b had more potent activity. Biological tests also showed that nitrogen atom at 7-position of azaindirubin was more beneficial to enhance the kinase inhibitory activity.

Select

Synthesis of 2-(N-formyl)-5-aryl/aryloxymethyl-1,3,4-thiadiazoles with potential bioactivity in PEG-400

Xi Cun Wang, Xiao Mei Ding, Sheng Qing Wang, Xue Fei Chen, Zheng Jun Quan

中国化学快报. 2010, 21(03): 301-304. https://doi.org/10.1016/j.cclet.2009.11.045

摘要 ( )

PDF全文 ( )

可视化

An environmental benign procedure for synthesis of 2-(N-formyl)-5-aryl/aryloxymethyl-1,3,4-thiadiazoles has been developed by reaction of 2-amino-5-aryl/aryloxymethyl-1,3,4-thiadiazoles with formic acid in PEG-400. The key advantages of this protocol are the shorter reaction time, higher yields, lower cost, simple workup, and environment-friendly compared to conventional organic solvent reaction. The present method does not involve any hazardous organic solvent or catalyst.

Select

Enantioselective reduction of acetophenone analogues using carrot and celeriac enzymes system

Xiang Liu, Zheng Guang Pan, Jian He Xu, He Xing Li

中国化学快报. 2010, 21(03): 305-308. https://doi.org/10.1016/j.cclet.2009.11.019

摘要 ( )

PDF全文 ( )

可视化

The enantioselective reduction of acetophenone analogues catalyzed by carrot and celeriac was performed in moderate conversions and excellent enantiomeric excesses. The steric factors and electronic effects of the substituents at the aromatic ring were found to significantly affect the efficiency of the enantioselective reduction of acetophenone analogues, while they had a little effect on the enantioselectivity of aeetophenone analogues reduction. It was also found that the conversions of acetophenone analogues reduction at 33℃ by means of both biocatalysts were three times as great as those at room temperature.

Select

Enantioselective addition of diethylzinc to aryl aldehydes catalyzed by 1,2,3,4-tetrahydroisoquinoline β-amino alcohol

Geng Xu, Zhan Zhu Liu

中国化学快报. 2010, 21(03): 309-311. https://doi.org/10.1016/j.cclet.2009.11.046

摘要 ( )

PDF全文 ( )

可视化

A highly effective, new chiral 1,2,3,4-tetrahydroisoquinoline catalyst 1 for the diethylzinc addition to aryl aldehydes has been investigated. Using 10 mo1% of this chiral catalyst, secondary alcohols can be obtained in up to 87% yield and 99.5% ee under mild conditions.

Select

Tri(t-butyl)phosphine-assisted selective hydrosilylation of terminal alkyne

Wei Wu, Xiao Yun Zhang, Shou Xing Kang, Yan Min Gao

中国化学快报. 2010, 21(03): 312-316. https://doi.org/10.1016/j.cclet.2009.11.040

摘要 ( )

PDF全文 ( )

可视化

A highly efficient and regio-/stereoselective method of hydrosilylating terminal alkynes was developed using Pt(DVDS)-tri(t-butyl)phosphine catalyst system at room temperature. Trans-products or alpha-products were obtained almost exclusively depending on the alkynes and silanes employed.

Select

Two new taraxastane-type triterpenoids from the fruit of Cicuta virosa L. var latisecta Celak

Zhen Lin Li, Shi Hui Qian, She Ban Pu

中国化学快报. 2010, 21(03): 317-321. https://doi.org/10.1016/j.cclet.2009.11.001

摘要 ( )

PDF全文 ( )

可视化

Two new taraxastane-type triterpenoids, 20-taraxastene-3β,12β,16β-triol 1 and 3β-feruloyloxy-20-taraxastene-16β,28-diol 2, were isolated from the fruit of Cicuta virosa L. var latisecta Celak. There structures were ducidated by ESI-MS, 1D-and 2D-NMR spectroscopic methods.

Select

A new hydroxybenzoic acid glycosides from the plant of Trifolium lupinaster

Li Yan Wang, Qun Xu, Shu Hua Li, Bing Zhao, Fei Yang

中国化学快报. 2010, 21(03): 322-324. https://doi.org/10.1016/j.cclet.2009.11.037

摘要 ( )

PDF全文 ( )

可视化

A new 5-O-(β-D-glucopyranosyl)-6'-O-benzoyl-2,5-dihydroxybenzoic acid was isolated from the ethyl acetate extract from the whole plants of Trifolium lupinaster L. Its structure was determined and deduced on the basis of their spectral data.

Select

Three new phenanthrenes from Monomeria barbata Lindl.

Ming Hui Yang, Le Cai, Mei Hong Li, Xiang Hui Zeng, Ya Bin Yang, Zhong Tao Ding

中国化学快报. 2010, 21(03): 325-328. https://doi.org/10.1016/j.cclet.2009.11.006

摘要 ( )

PDF全文 ( )

可视化

Three new monophenanthrene compounds were isolated from an acetone extract of the tubers of Monomeria barbata Lindl. (Orchidaceae). Using spectroscopic methods, the structures of compounds 1-3 were determined as 1,4,7-trihydroxy-2-methoxy-9,10-dihydrophenanthrene (1), 1-(p-hydroxybenzoyl)-2-methoxy-4,7-dihydroxy-9,10-dihydrophenunthrene (2), 1,3,8-tri(p-hydroxybenzyl)-4-methoxy-phenanthrene-4,7-diol (3). These compounds showed cytotoxicities on four tumor cell lines (HepG2, HL-60, Skov-3, A431).

Select

A new prenylated arylbenzofuran derivative from Morus alba L.

Hai Ying Tian, Xi Hea, Guang Yao Zeng, Jian Bin Tan, Fu Shuang Li, Guo Ru Liu, Gui Shan Tan, Ying Jun Zhou

中国化学快报. 2010, 21(03): 329-331. https://doi.org/10.1016/j.cclet.2009.11.036

摘要 ( )

PDF全文 ( )

可视化

2-[3,5-Di-O-β-D-glucosyl-4-(3-methylbut-2-enyl)phenyl]benzofuran-6-ol, a new prenylated arylbenzofuran derivative was isolated from Morus alba L. Its structure was elucidated by various spectroscopic methods including MS, ¹H NMR, ¹³C NMR, DEPT, ¹H-¹HCOSY, HMQC and HMBC.

Select

Further constituents from Rhododendron lepidotum L

Mudasir Ahmad Tantry, Reehana Khan, Seema Akbar, Abdul Sami Shawl, Mohammed Khalid Siddiqui

中国化学快报. 2010, 21(03): 332-336. https://doi.org/10.1016/j.cclet.2009.11.015

摘要 ( )

PDF全文 ( )

可视化

A unusual flavone glycoside named Shamimarin (1) and a new compound Acetoxy-8-methyl-chromen-2H-one (2) were isolated from aerial parts of Rhododendron lepidotum L. Along with four known coumarins daphnin (3), daphnetin 8-O-β-D-glucopyrano-side (4), daphnetin (5) and umbelliferone (6). The structural elucidations were based on analyses of chemical and spectroscopic data by including ID and 2D NMR analyses.

Select

Electrocatalytic oxidation of methanol at platinum electrode modified with Eu-Fe cyanide-bridged binuclear complexes

Yong Jun Ma, Yu Ying Pan, Wei Feng Wang, Mei Xia Yang, Min Zhou

中国化学快报. 2010, 21(03): 337-340. https://doi.org/10.1016/j.cclet.2009.11.048

摘要 ( )

PDF全文 ( )

可视化

The electrocatalytic oxidation of methanol at the platinum electrode modified with Eu-Fe cyanide-bridged binuclear complexes (Eu-Fe film) was investigated for the first time by cyclic voltammetry. Compared with the bare platinum electrode, the results showed that the modified electrode had excellent electrocatalytic activity for the oxidation of methanol; the oxidation peak potential shifted more negatively and the peak current increased about twenty times. The electrooxidation of methanol at the modified electrode with Eu-Fe cyanide-bridged binuclear complexes material exhibited the better tolerance capacity to poison of intermediate species; the peak current was proportional to the concentration of methanol in the range of 0.5-2.0 mol/L (R²=0.9991, n=7), which was a comparatively wider linear range. Moreover, based on the linear relationship between the peak current and the square root of scan rate, electrocatalytic oxidation process of methanol was confirmed to be a diffusion control process. Furthermore, according to the counting of electron transfer number (n_α) in the rate-limiting step and the slope of linear equation between acidity of electrolyte and the oxidation peak potential (E_p), the possible mechanism of the electrooxidation of methanol at the modified electrode was primarily discussed.

Select

Role of dissolved oxygen reduction in improvement inhibition performance of ascorbic acid during copper corrosion in 0.50 mol/L sulphuric acid

Mohammed A. Amin

中国化学快报. 2010, 21(03): 341-345. https://doi.org/10.1016/j.cclet.2009.10.026

摘要 ( )

PDF全文 ( )

可视化

The kinetics of dissolved O₂ reduction and hydrogen evolution reactions on copper surface was studied in naturally aerated and air and O₂-saturated 0.50 mol/L H₂SO₄ solutions using polarization measurements combined with the rotating disc electrode (RDE). The Koutecky-Levich plot indicated that the dissolved O₂ reduction at the copper electrode was an apparent four-electron process. A correlation between the presence of dissolved O₂ and the formation of Cu₂O, confirmed from XRD, was discussed. Ascorbic acid (AA) was tested as a safe inhibitor for copper corrosion in H₂SO₄ solutions at 25℃. Measurements were carried out as a function of dissolved oxygen concentration using Tafel polarization measurements. The addition of AA slowed down the reduction reaction of dissolved O₂ more effectively than the anodic reaction. Dissolved O₂ was found to enhance the inhibition performance of AA. Adsorption via hydrogen bonding was considered.

Select

Fluorescence quenching method for the determination of catechol with gold nanoparticles and tyrosinase hybrid system

Wen Juan Dong, Jin Ping Song, Chuan Dong, Martin M. F. Choi

中国化学快报. 2010, 21(03): 346-348. https://doi.org/10.1016/j.cclet.2009.11.043

摘要 ( )

PDF全文 ( )

可视化

The determination method of catechol by fluorescence quenching was developed. The assay was based on the combination of the unique property of gold nanoparticles with tyrosinase enzymatic reaction. In the presence of tyrosinase, the fluorescence of gold nanoparticles was quenched by catechol which can be employed to detect catechol. Under the optimal conditions, a linear range 5.0×10^-7-1.0×10^-3 mol L^-1 and a detection limit 1.0×10^-7 mol L^-1 of catechol were obtained, o-Quinone intermediate produced from the enzymatic catalyzed oxidation of catechol was considered to play the main role in the fluorescence quenching.

Select

A selective voltammetric detection for dopamine using poly (gallic acid) film modified electrode

Wei Song, Yu Chen, Juan Xu, Dan Bi Tian

中国化学快报. 2010, 21(03): 349-352. https://doi.org/10.1016/j.cclet.2009.10.008

摘要 ( )

PDF全文 ( )

可视化

The electrochemistry behavior of dopamine was investigated by cyclic voltammetry and differential pulse voltammetry at a poly (gallic acid) film modified glassy carbon electrode. Two electrons and two protons participated in the diffusion-controlled electrocatalytic oxidation of dopamine with a diffusion coefficient of 2.186×10^-5 cm²/s. The interference of ascorbic acid with the determination of dopamine could be efficiently eliminated. This work provided a simple approach to selectively and sensitively detect dopamine in the presence of high concentration of ascorbic acid.

Select

Separation of tryptophan enantiomers with molecularly imprinted polypyrrole electrode column

Zhi Dong Chen, Jing Xuan Wei, Wen Chang Wang, Yong Kong

中国化学快报. 2010, 21(03): 353-356. https://doi.org/10.1016/j.cclet.2009.11.044

摘要 ( )

PDF全文 ( )

可视化

In this study, we have fabricated molecularly imprinted polypyrrole (PPy) packed electrode columns and investigated their effects on separation of tryptophan (Trp) enantiomers by using potential control. The results indicate that the imprinted PPy electrode columns could efficiently enhance the L-Trp uptake and separate Trp enantiomers effectively, implying the great potential for the enantioselective recognition of other amino acids enantiomers.

Select

Tetra(acetylacetonato) tin (Ⅳ) as new catalyst for polytrimethylene terephthalate synthesis

Shu Yong Jia, Yu Rong Ren, Gong Ying Wang

中国化学快报. 2010, 21(03): 357-360. https://doi.org/10.1016/j.cclet.2009.10.015

摘要 ( )

PDF全文 ( )

可视化

Chelate tetra(acetylacetonato) tin (Ⅳ) was prepared and used as catalyst for polytrimethylene terephthalate synthesis. It exhibited higher catalytic activity than tetrabutyl titanate, butyltinhydroxide oxide and dibutyltin oxide. Decrease in reaction time, content of terminal carboxyl group, color intensity and increase in intrinsic viscosity were observed. The unique molecular structure can be considered as factor remarkably improving the catalytic activity of tetra(acetylacetonato) tin (Ⅳ).

Select

Synthesis and characterization of star-comb polybutadiene and poly(ethylene-co-butene)

Hong Xia Zhang, Yang Li, Chun Qing Zhang, Yan Ming Hu, Yu Rong Wang, Hong Wei Ma, Wei Li

中国化学快报. 2010, 21(03): 361-364. https://doi.org/10.1016/j.cclet.2009.11.031

摘要 ( )

PDF全文 ( )

可视化

A novel star-comb polybutadiene (SC-PB) was synthesized with n-butyllithium (n-BuLi) as initiator, epoxidized star liquid polybutadiene (ESPB) as coupling agent, cyclohexane as solvent by living anionic polymerization and grafting-onto technology. The SC-PB was subsequently hydrogenated by homogeneous catalysis (catalytic hydrogenation using nickel naphthenate/ triisobutyl aluminum), to transform the SC-PB into the corresponding star-comb poly(ethylene-co-butene) (SC-PEB). The SC-PB was characterized by SEC-TALLS, ¹H NMR, DSC and WAXD techniques. The hydrogenation degree and crystaninity degree of SC-PEB were also determined.

Select

Photodimerization and photooxygenation of 9-vinylcarbazole catalyzed by titanium dioxide and magnesium perchlorate

Hajime Maeda, Mio Yamamoto, Hideyuki Nakagawa, Kazuhiko Mizuno

中国化学快报. 2010, 21(03): 365-368. https://doi.org/10.1016/j.cclet.2009.11.020

摘要 ( )

PDF全文 ( )

可视化

Photoreaction of 9-vinylcarbazole in acetonitrile in the presence of titanium dioxide and a catalytic amount of magnesium perchlorate gave 3,6-di(9-carbazolyl)-1,2-dioxane as a photooxygenated product via photodimerization of 9-vinylcarbazole. The photoreaction proceeds via an electron transfer mechanism, where magnesium perchlorate accelerated formation of the photo-oxygenated product.

Select

Novel SrCe_0.75Zr_0.20Tm_0.05O_3-δ membrane for hydrogen separation

Wen Hui Yuan, Ling Ling Mao, Li Li

中国化学快报. 2010, 21(03): 369-372. https://doi.org/10.1016/j.cclet.2009.11.002

摘要 ( )

PDF全文 ( )

可视化

Dense ceramic membranes with protonic and electronic conductivity have attracted considerable interest in recent years. In this paper, the powders of SrCe_0.75Zr_0.20Tm_0.05O_3-δ were synthesized via the liquid citrate method, and the membranes of SrCe_0.75Zr_0.20Tm_0.05O_3-δ were prepared by pressing followed by sintering. X-ray diffraction (XRD) was used to characterize the phase structure of both the powder and sintered membrane. The microstructure of the sintered membranes was studied by scanning electron microscopy (SEM). Hydrogen permeation through the SrCe_0.75Zr_0.20Tm_0.05O_3-δ membranes was carried out using gas permeation setup at 900℃. Hydrogen permeation flux of SrCe_0.75Zr_0.20Tm_0.05O_3-δ membrane reaches up to 0.042 mL/ min cm² at H₂ partial pressure of 0.4 atm. The hydrogen permeation fluxes obtained in this paper are similar to that of SrCe_0.75Tm_0.05O_3-δ and Zr doping can increase mechanical strength of SrCe_0.75Zr_0.20Tm_0.05O_3-δ membranes and the resistance to reducing circumstance.

Select

The heavy atom effect on photocleavage of DNA by mono-hydroxyl halogenated corroles

Lei Shi, Hai Yang Liu, Li Ping Si, Kai Mei Peng, Li Li Youb, Hui Wang, Lei Zhang, Liang Nian Ji, Chi Kwong Chang, Huan Feng Jiang

中国化学快报. 2010, 21(03): 373-375. https://doi.org/10.1016/j.cclet.2009.11.027

摘要 ( )

PDF全文 ( )

可视化

DNA photocleavage properties of halogenated mono-hydroxyl corrole 1-5 were investigated. It was found that these corroles were able to photocleavage supercoiled pBR 322 DNA (SC) into nicked-circular DNA (NC). The activity of these corroles follows an order of 4 > 3 > 2≈ 1 > 5. The photosensitized singlet oxygen (φ_△) quantum yield by these corroles also follows that same order, showing the photocleavage activity is related to the heavy atom effect of halogen atoms on corroles.

Select

The polarization dependent differential cross sections of the reactions: H+LiH⁺(v=0, j=0)→H₂+Li⁺ and H⁺+LiH(v=0, j=0)→H₂⁺+Li

Xiao Hu Li, Mei Shan Wang, Chuan Lu Yang, Ling Zhi Ma, Ning Ma, Ji Cheng Wu

中国化学快报. 2010, 21(03): 376-378. https://doi.org/10.1016/j.cclet.2009.11.041

摘要 ( )

PDF全文 ( )

可视化

Quasi-classical trajectory (QCT) calculations have been carried out to study the generalized polarization dependent differential cross sections (PDDCSs) for the reactions H+LiH⁺(v=0,j=0)→H₂+Li⁺ and H⁺+LiH(v=0,j=0)→H₂⁺+Li occurring on the two lowest-lying electronic states of the LiH₂⁺ system, using the ab initio potential energy surfaces (PESs) of Martinazzo et al. [3]. Four PDDCSs, i.e., (2π/σ)(dσ₀₀/dω_t), (2π/σ)(dσ₂₀/doω_t), (2π/σ)(dσ₂₂₊/dω_t), (2π/σ)(dσ_21-/dω_t) have been discussed in detail.

选择文件类型/文献管理软件名称

选择包含的内容

本期目录

2010年, 第21卷, 第03期　刊出日期：2010-03-20

选择文件类型/文献管理软件名称

选择包含的内容

本期目录

2010年, 第21卷, 第03期 刊出日期：2010-03-20

2010年, 第21卷, 第03期　刊出日期：2010-03-20