中国化学快报

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Asymmetric Synthesis of (-)-(4R,5R)-4-[5-(Benzo[1,3]dioxol-5-yl)-4-hydroxyl-1-(pyridin-2-yl)-4,5-dihydro-1H-pyrazol-3-yl]benzamide

Xing Zhou LI, Xian Ping DAI, Jun Hai XIAO, Song LI

中国化学快报. 2005, 16(09): 1137-1139.

摘要 ( )

可视化

The asymmetric synthesis of (-)-(4R, 5R)-4-[5-(benzo[1, 3]dioxol-5-yl)-4-hydroxyl-1-epoxidation procedure as key step was described.

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The Synthesis of a Series of Phosphoryl Coumarins

Chui Lin RONG, Xin Cheng LIAO, Jian Chen ZHANG, Shu Xia CAO, Lun LIU, Yu Fen ZHAO

中国化学快报. 2005, 16(09): 1140-1142.

摘要 ( )

可视化

Different hydroxy substituted coumarins were successfully phosphorylated with diisopropylphophite (DIPPH) by the Atherton-Todd reaction in 76-89% yields. Moreover, the reaction activities of different hydroxys of the coumarins in the Atherton-Todd reaction were studied.

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Design and Synthesis of Novel 5-Sulfoxide-substituted Pyrazolo[5,1-d][1,2,3,5]tetrazin-4(3H) ones

Yan Chao WU, Xiao Mao ZOU, Fang Zhong HU, Hua Zheng YANG

中国化学快报. 2005, 16(09): 1143-1146.

摘要 ( )

可视化

A series of novel 5-sulfoxide-substituted pyrazolo[5,1-d] [1,2,3,5]tetrazin-4(3H)ones 4a-j were designed and efficiently synthesized via a diazotization of 5-amine-3-methylsulfinyl-1H-pyrazole, followed by cycloaddition with aryl isocyanate. A possible reaction mechanism is outlined and discussed. These new compounds exhibit some biological activity as preliminary bioassay indicated. Their structures were confirmed with ¹H NMR, IR and elemental analysis.

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Asymmetric Synthesis of N-(Diphenylphosphinyl) furfurylamine by the Enantioselective Alkylation of Furfurylimine

Hai Le ZHANG, Xiao Mei ZHANG, Xin LI, Ai Qiao MI, Xin CUI, Yao Zhong JIANG

中国化学快报. 2005, 16(09): 1147-1150.

摘要 ( )

可视化

Optically active N-(diphenylphosphinyl) furfurylamines 2 with good ee values were obtained by the enantioselective addition of dialkylzincs to furfuryl imine 1 in the presence of chiral aminoalcohol derivatives and oxazolines.

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A Novel Diamine,4′-Phenylphenyl 4-(3",5"-Diaminobenzoyloxy)-benzoate and Longer Side-chain Polyimide

Jin YANG, Li Gang REN, Xiang Yang LIU, Yi GU

中国化学快报. 2005, 16(09): 1151-1154.

摘要 ( )

可视化

This is a part of our systematic research work on polyimides with mesogenic unit side chain. In this study, a new 4'-phenylphenyl 4-(3",5"-diaminobenzoyloxy) benzoate and polyimide were synthesized, and characterized by FTIR, ¹H-NMR, inherent viscosity, mechanical properties,and solubility measurements. The diamine composed with mesogenic unit aryl ester groups and biphenyl group with longer L/D ratio, was synthesized by two key steps. Firstly, the hydroxy group of 4-hydroxybenzoic acid was protected by acetoxy group for avoiding self-polymerization of 4-hydroxybenzoic acid, and then selectively hydrolyzed after esterification of carboxyl.Secondly, a selective catalysis hydrogenation was adopted to prevent the aryl ester from deoxidation. Based on this diamine, a novel polyimide was prepared by polycondensation of 4'-phenylphenyl 4-(3", 5"-diaminobenzoyloxy)benzoate and 4-aminophenyl ether(ODA) with 4,4'-oxydiphthalic anhydride(ODPA) in N-methyl-2-pyrrolidone (NMP). The resulting polyimide with longer side chain showed better solubility and more regular structure. Its inherent viscosity is lower than that without side chains, but its modulus and strength not only maintained, even improved.

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Synthesis of Tetrahydrofuran and Tetrahydropyran Derivatives Catalyzed by Tungstophosphoric Acid in Ionic Liquid

Wen PEI, Li SUN, Chun Hua XIONG, Chen SHEN

中国化学快报. 2005, 16(09): 1155-1157.

摘要 ( )

可视化

Synthesis of tetrahydrofuran and tetrahydropyran derivatives catalyzed by tungstophosphoric acid (H₃PW₁₂O₄₀) were conveniently performed with high yield from the corresponding unsaturated alcohols in ionic liquid. Sufuric acid (H₂SO₄), trifluoromathanesulfonic acid (TfOH)and p-toluenesulfonic acid (TsOH) were also explored for preparing these products in ionic liquid.The catalysts and ionic liquid can be easily recovered and reused.

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A Novel Photoproduct of 1,3-Dimethyluracil in Phosphate Buffered-saline

Feng LIN, Shao Yong BAI

中国化学快报. 2005, 16(09): 1158-1160.

摘要 ( )

可视化

1, 3-Dimethyluracil (DMU) in phosphate buffered-saline (PBS, pH=8) was irradiated by a medium pressure mercury lamp (MPML) and produced a novel compound C₆H₉N₂O₆P. The composition and structure of the compound has been identified by elemental analysis, EIMS, UV,IR, ¹H and ³¹p-NMR.

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A New Approach to Ethyl 1-Aroyl/Aroylmethyl-5-methyl-3-methylthiopyrazole-4-carboxylates:High Regioselectivity in Alkylation and Acylation Reactions between N-1 and N-2 of a Pyrazole Derivative

Li Rong WEN, Gui Long ZHAO, Ming LI, Wen Ying QI, Xiu Li ZHANG, Hua Zheng YANG

中国化学快报. 2005, 16(09): 1161-1164.

摘要 ( )

可视化

Two series, totalizing twelve, of new compounds, ethyl 1-aroyl/aroylmethyl-5-methyl-3-methylthiopyrazole-4-carboxylates 5/6, have been synthesized via highly regioselective acylation and alkylation of ethyl 3-methyl-5-methylthio-1H-pyrazole-4-carboxylate 2a with aroyl chloride 3 and alpha-tosyloxysubstitutedacetophenones 4. Unexpected structures of the product have been unambiguously determined by both X-ray crystallographic analysis and 2D NMR.

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Synthesis and Characterization of Novel Polyimides Based on Pyridine-containing Diamine

Shu Jiang ZHANG, Yan Feng LI, Xiao Long WANG, Da Xue YIN, Yu SHAO, Xin ZHAO

中国化学快报. 2005, 16(09): 1165-1168.

摘要 ( )

可视化

A new aromatic diamine monomer containing pyridine unit, 2,6-bis (4-aminophenoxy-4'-benzoyl)pyridine(BABP), was synthesized in three steps, starting from 2,6-pyridinedicarboxyl chloride. A series of novel pyridine-containing polyimides were prepared via the polycondensation of BABP with various aromatic dianhydrides through poly(amic acid) precursors, and thermal or chemical imidization of the precursors. The polyimides exhibit desirable properties,e.g., good solubility in N-methyl-2-pyrrolidone and m-cresol, excellent thermal stability and ftlm-forming capability, as well as high inherent viscosity, indicating high molecular weight.

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Synthesis of a New Rigid Bicyclic AMPP Ligand (TIAMPP) and Application in Asymmetric Hydrogenation

Da Chun GONG, Ping WEI, Hua ZHOU, Xiong Liang WANG, Ping Kai OUYANG

中国化学快报. 2005, 16(09): 1169-1172.

摘要 ( )

可视化

The new rigid bicyclic AMPP((S)-TIAMPP) has been synthesized from the corresponding Ticol and Ph₂PCl. The application of (S)-TIAMPP in Rh-catalyzed asymmetric hydrogenation of α-dehydroamino acids derivatives has been examined. Up to 93% ee was obtained.

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Suzuki Coupling Reaction Catalyzed by Cyclopalladated Complexes of Tertiary Arylamines in Ionic Liquid

Hua YI, Jin Biao LIU, Qiang LI, Jie TANG

中国化学快报. 2005, 16(09): 1173-1176.

摘要 ( )

可视化

Suzuki cross-coupling reaction of phenylboronic acid with aryl halides catalyzed by cyclopalladated complexes of tertiary arylamines immobilized in ionic liquid[Bmim]⁺BF₄^- was reported. The catalytic system proved to be efficient and be reused at least 3 times without significant loss of activity.

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A Facile Synthesis of 2,7-Diaminothieno[2,3-d:5,4-d]-dipyrimidine-4,5(3H,6H) diones

Sheng Zhen XU, Min Hui CAO, Ming Wu DING, Hong Wu HE

中国化学快报. 2005, 16(09): 1177-1180.

摘要 ( )

可视化

2, 7-Diaminothieno[2, 3-d:5, 4-d]dipyrimidine-4, 5(3H, 6H)diones 4 were synthesized by a facile synthetic method, which includes bis-aza-Wittig reaction of bis-iminophosphorane 1 with aromatic isocyanate to give bis-carbodiimide 2 and subsequent reaction of 2 with various dialkylamine in the presence of solid K₂CO₃ or EtONa.

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Synthesis and Spectroscopic Investigation of Azoporphyrins

Xin Gang LIU, Ya Qing FENG, Fei LI, Xue CHEN, Xiang Gao LI, Chun Yan ZHANG

中国化学快报. 2005, 16(09): 1181-1184.

摘要 ( )

可视化

The synthesis of a series of new covalently-connected azoporphyrin derivatives is described and the photochemical properties of the new compounds are discussed. The two chromophores of these derivatives exhibit their absorption spectroscopic properties respectively.In the fluorescence emission spectra, intermolecular fluorescence quenching is detected.

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Design and Synthesis of a Highly Stable Six-hydrogen-bonded Self-assembly Yellowish Green Electroluminescent Molecular Duplex

Guang Dong LEI, Yi YI, Zhi Yun LU, Ming Gui XIE

中国化学快报. 2005, 16(09): 1185-1188.

摘要 ( )

可视化

This paper describes the design, synthesis and characterization of a hydrogen-bonded molecular duplex with 1,8-naphthalimide fluorescent pendants. The two oligoamide molecular strands, with complementary hydrogen bond sequences of DDADAA and AADADD, caa form an ultra stable self-assembly duplex. Its molecular structure was confirmed by ¹H NMR and ESI-MS, and its photoluminescence properties were determined. The resulting duplex exhibited a dramatically enhanced photoluminescence (PL) quantum efficiency of 63.7% compared to the corresponding 1,8-naphthalimide segment (32.4%), suggesting that the formation of the duplex with larger molecular weight could successfully inhibit the quenching of the fluorescent pendant.This novel duplex is a prospective candidate for new electroluminescent emitter.

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Synthesis and Biological Evaluation of Pyranone Analogues of Territrem B

Xiang Rui JIANG, Lei AO, Chang Xin ZHOU, Lei Xiang YANG, Hai Bo LI, Xiu Mei WU, Hua BAI, Qi Jun ZHANG, Yu ZHAO

中国化学快报. 2005, 16(09): 1189-1192.

摘要 ( )

可视化

23 compounds containing pyranone pharmaeophore of territrem B were designed and synthesized. Some of the analogues showed IC₅₀ values of AChE inhibition at 10^-5 mol/L.

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Synthesis and Adsorption Properties of Polystyrene-supported Chelating Resins Containing Heterocyclic Functional Groups

Chun Nuan JI, Rong Jun QU, Chun Hua WANG, Chang Mei SUN, Qing Hua TANG

中国化学快报. 2005, 16(09): 1193-1196.

摘要 ( )

可视化

A series of new chelating resins with incorporating heterocyclic functional groups:pyridine, thiadizole, benzothizole into macroporous chloromethylated polystyrene were synthesized via hydrophilic spacer arm of polyethylene glycol co ntaining sulfur. These chelating resins were found to show high adsorption capacities for Ag⁺, Hg²⁺, Au³⁺ and Pd²⁺, and the presence of spacer arm can enhance adsorption ability due to increase the hydrophilicity of the chelating resins.

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Cu (I)/Diamine-catalyzed Aryl-alkyne Coupling Reactions

Ye Feng WANG, Wei DENG, Lei LIU, Qing Xiang GUO

中国化学快报. 2005, 16(09): 1197-1200.

摘要 ( )

可视化

CuI/ethylene diamine/K₂CO₃/dioxane is shown to be a useful system for the cross coupling reactions of various aryl iodides and bromides with aryl and alkyl alkynes. Compared to the conventional Sonogashira reactions, the new procedure is free of palladium and phosphines.

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High Charge Mobility of a Perylene Bisimide Dye with Hydrogen-bond Formation Group

Jing Zhi SUN

中国化学快报. 2005, 16(09): 1201-1204.

摘要 ( )

可视化

A perylene bisimide dye covalently bonded with a hydrogen-bond formation group of 1,3, 5-triazine-2, 4-diamine has been synthesized. Its casting films show a charge carrier mobility over 10^-3 cm²/Vs, which is in the range of the highest values found for other promising charge transport materials suitable for solution processable technique.

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A New Synthesis of 4,4-Diaryl/Diheteroaryl-3-butenyl Derivatives of Nipecotic Acids as GABA Transporter Inhibitors

Jian Ge ZHANG, Chang Sheng JIANG, Guo Qiang LIN, Ren WEN

中国化学快报. 2005, 16(09): 1205-1208.

摘要 ( )

可视化

A new method for the synthesis of 4, 4-diaryl/diheteroaryl-3-butenyl derivatives of nipecotic acid as GABA transporter inhibitors is described. The key intermediates 4-tosyl-1,1-diaryl/diheteroaryl-1-butene 10a-d were synthesized by Wittig reaction, and followed by alkylation with (R)-3-piperidinecarboxylate. The resulting N-cycloalkylated amino acid esters 11a-d were saponified and then acidified to get the target compounds 1a-d. The preliminary bioassays showed that 1a-d exhibited excellent inhibition of[³H]-GABA uptake in vitro of culture cells.

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Synthesis and Application of a New Acrylic Ester Resin for Recycling SIPA from its Water Solution

Wei Ben YANG, Ai Min LI, Quan Xing ZHANG, Hong Ming QIAN, Jun FAN, Li Cheng YANG

中国化学快报. 2005, 16(09): 1209-1212.

摘要 ( )

可视化

A new acrylic ester polymer YWB-7 resin was prepared and characterized. The properties of YWB-7 resin were compared with those of the commercial Amberlite XAD-7, Diaion HP2MG and hypercrosslinked macroporous polymer NDA-150 resins. Both surface area and micropore area of YWB-7 resin were bigger than those of XAD-7 resin and HP2MG resin. The YWB-7 resin was successfully employed to recycle 5-sodiosulfoisophthalic acids (SIPA) from its solutions with and without methanol.

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Synthesis of Dialkyl-substituted Terminal Olefin

Shen Yong REN, Bao Jian SHEN, Qiao Xia GUO

中国化学快报. 2005, 16(09): 1213-1216.

摘要 ( )

可视化

Dialkyl-substituted terminal olefins were synthesized from the coupling reaction of α-olefins which were catalyzed by zirconocene dichloride/methylalumoxane (MAO) catalyst system under mild condition. High yield was gained and no other oligmer was detected. It was found that the ratio of Al/Zr is responsible for the selectivity of product.

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Highly Oxygenated Monoterpenes from Eupatorium fortunei

Hai Xia JIANG, Kun GAO

中国化学快报. 2005, 16(09): 1217-1219.

摘要 ( )

可视化

A pair of epimers of highly-oxygenated monoterpenes were isolated from the traditional Chinese medicine Eupatorium fortunei. Their structures were elucidated on the basis of the spectral analysis as (1R^*, 2S^*, 3R^*, 4R^*, 6S^*)-1, 2, 3, 6-tetrehydroxy-p-menthane (1) and (1S^*,2S^*, 3S^*, 4R^*, 6R^*)-1, 2, 3, 6-tetrehydroxy-p-menthane (2).

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Two New Sesquiterpenes from Ligularia macrophylla

Tong SHEN, Wei Dong XIE, Zhong Jian JIA

中国化学快报. 2005, 16(09): 1220-1222.

摘要 ( )

可视化

Two new eremophilane sesquiterpenes, 15β-formic ether-6-oxo-furanoeremophilane (1)and 6α, 15β-epoxy eremophila-7(11)-en-8α, 12-olide (2) were isolation from the roots of Ligularia macrophylla. Their structures were deduced from spectroscopic methods and 2D NMR experiments.

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Two New Sesquiterpenes from Eupatorium lindleyanum

Nian Yun YANG, Shi Hui QIAN, Jin Ao DUAN, Ping LI, Li Juan TIAN

中国化学快报. 2005, 16(09): 1223-1226.

摘要 ( )

可视化

Two new germacrane sesquiterpenes:3,8,14-trihydroxy-1(10)E,4Z, 11(13)-germacratrien-12, 6-olide, 8-(2-methyl-4-hydroxyl-2E-butenoyl), 3,14-diacetoxy (eupalinolide A, 1), and 3,8,14trihydroxy-1(10) E, 4E, 11(13)-germacratrien-12,6-olide, 8-2-methyl-4-hydroxyl-2E-butenoyl), 3,14-diacetoxy (eupalinolide B, 2) were isolated from Eupatorium lindleyanum. Their structures were elucidated by means of ¹H and ¹³C NMR spectroscopic analysis, including 2D NMR technique.

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A New Cytotoxic Compound from Penicillium auratiogriseum,Symbiotic or Epiphytic Fungus of Sponge Mycale plumose

Zhi Hong XIN, Wei Ming ZHU, Qian Qun GU, Yu Chun FANG, Lin DUAN, Cheng Bin CUI

中国化学快报. 2005, 16(09): 1227-1229.

摘要 ( )

可视化

A new compound, (S)-2, 4-dihydroxy-1-butyl (4-hydroxy) benzoate (1), and a known compound, fructigenines A (2), were isolated from fungus Penicillium auratiogriseum derived from sponge Mycale plumose, by bioassay-guided fractionation. Their structures were established by spectroscopic and chemical methods. Both compounds showed cytotoxic activity against tsFT210 cells.

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Two New Eremophilenolides from Cacalia pilgeriana

Er Wei LI, Kun GAO, Zhong Jian JIA

中国化学快报. 2005, 16(09): 1230-1232.

摘要 ( )

可视化

Two new eremophilenolides, 1β-hydroxy-2β-methylsenecioyloxyeremophil-7 (11)-en-8β (12)-olide (1), 1β-hydroxy-2β-methylsenecioyloxy-8α-methoxyeremophil-7 (11)-en-8β (12)-olide (2), were isolated from the roots of Cacalia pilgeriana. Their structures were elucidated by spectroscopic methods and X-ray diffraction analysis.

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Study on the Interaction between Strychnine and Bovine Serum Albumin by Capillary Electrophoretic Frontal Analysis

Shao Ping FU, Xiao Zhe ZHANG, Feng ZHANG, Qing XU, Hong Bin XIAO, Xin Miao LIANG

中国化学快报. 2005, 16(09): 1233-1236.

摘要 ( )

可视化

The protein binding constant, binding sites of the Strychnos alkaloid-strychnine and bovine serum albumin (BSA) was determined by capillary electrophoretic frontal analysis (CE-FA)for the first time. The experiment was carried out in a polyacrylamide-coated fused silica capillary (48.4 cm×50 μm i.d., 38.1 cm effective length) with 20 mmol/L citrate/MES buffer (pH 6.0, ionic strength 0.17). The applied voltage was 12 kV and detection wavelength was set at 257nm. The plateau height of the peak was employed to determine the unbound concentration of drug in BSA equilibrated sample solution based on the external drug standard in the absence of protein. The present method provides a convenient, accurate technique for the early stage of drug screening.

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Direct Electrochemistry of Cytochrome C on the Glassy Carbon Electrode Modified with 1-Pyrenebutyric Acid/MWNTs

Qiang ZHAO, Qian Kun ZHUANG

中国化学快报. 2005, 16(09): 1237-1240.

摘要 ( )

可视化

With 1-Pyrenebutyric acid (PBA) and multiwalled carbon nanotubes (MWNTs), glassy carbon electrode modified was successfully prepared. In phosphate buffer solution (pH 7.0), the direct electrochemistry of cytochrome C (Cyt C) was realized. In the cyclic voltammetry experiment two pairs of redox peaks of Cyt C were observed at 0.018 V and-0.314 V (vs. SCE),respectively. The redox reaction at 0.018 V was diffusion controlled, while the redox reaction at -0.314 V was adsorption controlled.

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A Novel Method for Modification of SMPU by Micro-phase Separation Promoters

Shao Jun CHEN, Jing Cang SU, Peng Sheng LIU

中国化学快报. 2005, 16(09): 1241-1244.

摘要 ( )

可视化

A novel method of controlling the shape memory properties of shape memory polyurethane (SMPU) by addition of micro-phase separation promoters including 1-octadecanol (ODO) and liquid paraffin (LP) is reported. The results indicate that the strain recovery temperature and the strain modulus rate (E_g/E_r) were increased significantly with addition of small amount of micro-phase separation promoters. Thus it can increase the shape memory fixity rate and other shape memory behaviors of SMPU.

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Simple Fluorimetric Determination of Benzo[a]pyrene in Cigarette Smoke without Preseparation Procedure

Li Fang HE, Dan Li LIN

中国化学快报. 2005, 16(09): 1245-1248.

摘要 ( )

可视化

Constant-energy synchronous fluorimetry was used for the identification of benzo[a]pyrene in mixtures with a detection limit of 1.34 nmol/L. The recovery experiments in cigarette smoke samples have also obtained satisfactory results of 99.1-103.5% for benzo[a]pyrene.

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Investigation on a Small Oscillogram

Hong Fang ZHANG, Jian Bin ZHENG, Hong Gang NI, Hung KAO

中国化学快报. 2005, 16(09): 1249-1251.

摘要 ( )

可视化

A small oscillogram, one end of which was substituted by a bright point caused by the redox of an appropriate depolarizer and the other end of which was the redox of Hg or the redox of supporting electrolyte cation, was investigated in this paper. Experimental results of application of the small oscillogram to oscillographic determination of cefoperazone showed that the small oscillogram was more stable, sensitive, and less interference than classical oscillogram.

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Methanol Tolerant PWA-Pt/C Catalyst with Excellent Electrocatalytic Activity for Oxygen Reduction in Direct Methanol Fuel Cell

Yan Zhuo LU, Tian Hong LU, Chang Peng LIU, Ya Wen TANG, Wei XING

中国化学快报. 2005, 16(09): 1252-1254.

摘要 ( )

可视化

It was reported for the first time that phosphorictungstenic acid (PWA) could promote the oxygen reduction reaction (ORR) and inhibit the methanol oxidation reaction at the cathodic Pt/C catalyst in the direct methanol fuel cell (DMFC). When the weight ratio of PWA to Pt/C is 1,the composite catalyst increases the reduction current of oxygen by about 38% and decreases the oxidation current of methanol by about 76% compared with that of the Pt/C catalyst.

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One-dimensional Copper (Ⅱ) Complex Constructed with Nitrate Counter-anion as Bitopic Connector

Chun Hua GE, Xiang Dong ZHANG, Wei GUAN, Qi Tao LIU

中国化学快报. 2005, 16(09): 1255-1258.

摘要 ( )

可视化

Coordination polymer {[Cu(NPPCA)₃(NO₃)(H₂O)]·NO₃·H₂O}_n 1 (NPPCA=N-(4'-nitrophenyl)-4-pyridinecarboxamide) has been synthesized by the reaction of NPPCA with copper(Ⅱ) nitrate in ethanol-water solution and characterized by X-ray diffraction. 1 crystallizes in the monoclinic space, group P2₁/n, a=17.341(6)Å, b=6.744(2)Å, c=34.555(12)Å, β=100.493(6)°, V=3974(2)Å³, Z=4. Each copper(Ⅱ) ion has a distorted octahedral coordination geometry. Nitrate anion adopts the unusual coordination mode linking two adjacent copper(Ⅱ)ions to form a one-dimensional coordination polymer and these chains are further linked by noncovalent interactions.

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Photocatalytic Dye Methyl Orange Decomposition on Ternary Sulfide (CdIn₂S₄) under Visible-light

Xiao Dan YU, Xue Song QU, Yi Hang GUO, Chang Wen HU

中国化学快报. 2005, 16(09): 1259-1262.

摘要 ( )

可视化

A novel and efficient photocatalyst, CdIn₂S₄, was simply prepared by a programmed temperature hydrothermal method. The product had a nanometer size (10-15 nm) and strong absorption in the range of 200 to 580 nm, and it exhibited visible-light photocatalytic activity to decompose dye methyl orange in aqueous system.

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Studies on the Phase Properties of Winsor Ⅰ-Ⅲ Type Microemulsions with Dielectric Relaxation Spectroscopy

Jin Ling CHAI, Yan Hong GAO, Kong Shuang ZHAO, Gan Zuo LI, Gao Yong ZHANG

中国化学快报. 2005, 16(09): 1263-1266.

摘要 ( )

可视化

The dielectric relaxation spectroscopy (DRS) of Winsor Ⅰ~Ⅲ microemulsions for nonionic surfactant octyl polyglucoside C₈G_1.46/1-butanol/cyclohexane/water system was studied.The experiment shows that the permittivity decreases with the increase in the frequency and clear dielectric relaxation phenomena were observed. Permittivity obviously decreases with the change of the microstructure of the microemulsion, W/O, B.C. and O/W can be distinguished by the permittivity.

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Synthesis of Dimethyl Carbonate from Methanol and Carbon Dioxide Catalyzed by Potassium Hydroxide under Mild Conditions

Hong WANG, Bin LU, Qing Hai CAI, Feng WU, Yong Kui SHAN

中国化学快报. 2005, 16(09): 1267-1270.

摘要 ( )

可视化

The synthesis of dimethyl carbonate (DMC) from methanol and carbon dioxide using potassium hydroxide as catalyst in the presence of CH₃I and the effect of ionic liquid on the reaction were investigated. The results showed that KOH is an effective catalyst; the high selectivity and raised yield of DMC formation under mild conditions were achieved. However,the addition of the ionic liquid, 1-ethyl-3-methylimidazolium bromide (emimBr), can evidently accelerate the conversion of methanol and yield of the product.

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Degradation of Microcystin-RR by Combination of UV/H₂O₂ Technique

Rui Ping QIAO, Yong Min MA, Xin Hua QI, Nan LI, Xiang Can JIN, Qi Shan WANG, Yuan Yi ZHUANG

中国化学快报. 2005, 16(09): 1271-1274.

摘要 ( )

可视化

The experiments were performed to investigate the degradation of microcystins in order to assess the effectiveness and feasibility of UV/H₂O₂ system for the disinfection of water polluted by microcystins. The influence factors such as H₂O₂, pH and UV light intensities were investigated respectively. Degradation of microcystin-RR (MC-RR) could be fitted by either the pseudo-first-order or second-order rate equations. This homogenous system could significantly enhance the degradation rate due to the synergetic effect between UV and H₂O₂. The degradation mainly followed the mechanism of direct photolysis and.OH oxidation reactions. Experimental results showed that 94.83% of MC-RR was removed under optimal experimental conditions and the UV/H₂O₂ system provided an alternative to promote the removal of microcystins in drinking water supplies.

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In situ FTIR Investigation of Magnetic Field Effect on Heterogeneous Photocatalytic Degradation of Benzene over Pt/TiO₂

Wen ZHANG, Xu Xu WANG, Xian Zhi FU

中国化学快报. 2005, 16(09): 1275-1278.

摘要 ( )

可视化

In situ FTIR spectroscopy was utlized to investigate the magnetic field effect on the heterogeneous photocatalytic degradation of benzene over platinized titania (Pt/TiO₂). The results revealed that the employment of magnetic field may not change the mechanism of photocatalytic degradation of benzene, however, it greatly facilitate the conversion of benzene to phenol and quinone, as well as the transformation from phenol to quinone, resulting in opening the benzene ring easily and promoting the production of CO₂.

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2005年, 第16卷, 第09期　刊出日期：2005-09-20

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2005年, 第16卷, 第09期 刊出日期：2005-09-20

2005年, 第16卷, 第09期　刊出日期：2005-09-20