Loading...
CJCU

Table of Content

    24 January 1996, Volume 17 Issue 1
    Previous Issue    Next Issue
    Articles
    Studies on Rare Earth Complexes of Quaternary Ammonium Salt(Ⅶ)──Synthesis,Characterization and Structure of Tetrabutylammonium Dinitrato Tetraisothiocyanato Erbiumate
    YAN Chun-Hua, ZHANG Ya-Wen, JIA Jian-Tao, LI Biao-Guo, HUANG Chun-Hui
    1996, 17(1):  1-5. 
    Asbtract ( )   PDF (491KB) ( )  
    Related Articles | Metrics
    Aseries of new type mixed ligand complexes were synthesized.The general for-mula was C52H108L4 N9O6S4, Ln=Eu, Dy, Er,Yb,Y.The IRspectra of the complexes werestudied. Their mor conductivity shows they are 3:1 type electrolytes and the ionic crys-tals. The single crystal structure of the title complex was determined by a X-ray analysis.The crystal is rhombic, space group Pnnn,with unit cell dimensions:a=1.2470(7)nm,b=1.2934(3)nm,c=2. 1112(6)nm,Z=2,R=0.066.Erbium is coordinated by 4 oxygenatoms of two bidentate nitrate groups, and 4 nitrogen atoms of four thiocyanates,so the oo-ordination number is 8.The bond lengths of Er Oand Er Nare 0. 2386 nm and 0.2457nm respectively. The polyhedron skeleton around Er3+ is a distorted dodecahedron.
    Hydrothermal Synthesis of BaTiO3 in the Presence of NO3-Ion
    WU Ming-Mei, LI Li, XU Ru-Ren
    1996, 17(1):  6-9. 
    Asbtract ( )   PDF (224KB) ( )  
    Related Articles | Metrics
    Tetragonal BaTiO3 was prepared hydrothermally in alkaline aqueous solution ofBa(NO3)2 and Ti(OC4H9)4 at as low as 240℃. The influence of alkalinity, nitrate ion,reactivity of titanium source and degree of fill on the formation, particle sizes and morpholo-gies was investigated by means of XRD, DSCand IR.The optimum KOHconcentration wasabout 1.0 mol/L, in which BaTiO3 was the stablest phase among the family of BaO-TiO2.The nitrate ion played a positive role in the formatin and growth of BaTiO3 fine crystals. TheMgher the reactivity of titanium source and degree of fill is, the easier the formatin of tetragonal BaTiO3 is.
    A NMR Investigation on the interaction of Lanthanide Complexes with Phospholipid Bilayers
    YUAN Chun-Bo, ZHAO Da-Qing, WU Yi-Jie, PEI Feng-Kui, NI Jia-Zuan
    1996, 17(1):  10-13. 
    Asbtract ( )   PDF (2382KB) ( )  
    Related Articles | Metrics
    One and two dimentional NMRmethods were used to investigate the interactionsof lanthanide complexes(Lncit2 and Ln-DTPA)with phospholipid bilayers. The resultsshowed that in the phospholipid bilayers dispersion containing citrate ligand at pH 7.4,lan-thanide ions would initially combine with citrate ligand and form Lncit2 complexes whichhave little effect on the structure of phospholipid bilayers. Ln-DTPAcomplex does not affectthe bilayers structure either.These results provided important experimental data for evaluat-ing scientifically the toxicities of lanthanide ions when they were introduced into the biologi-cal body.
    Synthesis of a Series of Linear Clusters [M2M′S4O4]2-and Relationship Between Spectra and Structure
    NIU Shu-Yun, YANG Bing, LUO Kai, WANG wei-Ling, ZHANG Zhi-Gui, SHI Long
    1996, 17(1):  14-18. 
    Asbtract ( )   PDF (393KB) ( )  
    Related Articles | Metrics
    Six linear clusters [Et1N]2[M2M′S4O4](M=Mo,W;M′=Co, Ni, Fe)wereprepared and chracterized by means of UV-Vis, IRand XPSspectra. By comparing andstudying the spectra, the d electron configuration,valence of central metal M′and the mi-cro-environment of[M′S4] are discussed. Based on this,the configuration of anion of theclusters was inferred and the stability of the clusters was discussed.
    Convenient Preparation and Properties of C60(OH)x
    SUN Da-Yong, LIU Zi-Yang, GUO Xing-Hua, SHE Yi-Min, ZHOU Yu, LIU Shu-Yhg
    1996, 17(1):  19-20. 
    Asbtract ( )   PDF (148KB) ( )  
    Related Articles | Metrics
    In this paper,we introduce a very convenient method to produce water soluble C60derivatives──fullerols by the reaction of C60 with potassium in toluene solution. FT-IR,1HNMRand FABMSproved the multi-hydroxyl and C60 cage structures of the products, Theproperties of unstability to light,heat, basicity of aqueous solution and the solubility insome common polar solvents were also described.
    Studies on Coenzyme B12Model Complexes(Ⅷ)──The Characterization of Products of Photochemical Reactions of Oxygen Insertion into Co—C Bond of RCo(Salen)L Complexes
    WANG Zhi-Lin, YI Zheng-Ping, LI Tian, CHEN Ying, HUANG Zhi-Ming, YANG Gui-Di, XUE De-Ping, CNEN Hui-Lan
    1996, 17(1):  21-23. 
    Asbtract ( )   PDF (2263KB) ( )  
    Related Articles | Metrics
    The reaction of molecular oxygen insertion into Co—C bond of RCo(Salen)L(R=CH3, C2H5,n-C3H7,n-C4Hg and i-C4H9,L=N2Oor Py)complexes under photochemicalconditions was studied by HPLCand UV-Vis spectrophotometry and the resulting productswere characterized by elementary analysis,IR,UV-Vis, ESI-MSand 1H NMRspectra. Theresult shows that the insertion reaction of the oxygen into Co—C bond occurs and the prod-ucts are ROOCo(Salen)Lcomplexes which can be reduced to alcohols by NaBH4 in THFandbenzene. The further studies on kinetics and mechanisms of the reaction are proceeding.
    Synthesis and Proton Relaxivity of Gd-EDDS and Gd-EDDS and Gd-THEC
    LU Zheng-Rong, ZHUO Ren-Xi, YIN Chao, ZHOU Jian-Wei
    1996, 17(1):  24-26. 
    Asbtract ( )   PDF (225KB) ( )  
    Related Articles | Metrics
    Two amino acid derivative ligands,ethylenediamine-N,N′-disuccinic acid(EDDS)and N,N,N′,N′-tetrahydroxyethylcystine(THEC),were synthesized from the reaction ofL-aspartic acid with 1,2-dibromoethane and L-cystine with chloroethanol respectively. Theirparamagnetic gadolinium(Ⅲ) complexes were prepared by the reaction of the ligands with Gd2O3 and Gd(OAc)3 respectively. The ligands and their Gd(Ⅲ) complexes were character-ized by IR,1HNMRspectroscopy and elemental analysis. The proton relaxivity of the com-plexes was investigated, and the R1 values of Gd(Ⅲ)-EDDSand Gd(Ⅲ)-THECare 10.33and 6.62 mmol-1·L·s-1,respectively.
    A New Method for Rapid Determination of Adsorption Heatby Temperature Programmed Desorption Frontal Chromatography
    YANG Su, YE Xue-Fei, DAI Min-Guang
    1996, 17(1):  27-32. 
    Asbtract ( )   PDF (425KB) ( )  
    Related Articles | Metrics
    Anew method for the rapid determination of adsorption heat was established.This method was based on the Polanyi′s potential theory together with the determination oftemperature programmed desorption curve. The principle of the method was discussed in detail. By means of microcomputer sampling and data processing,the duration of runs for measuring the curves of the differential heat versus coverage was about 1 h.
    The Direct Electrochemistry of Hemoglobin at Bare Silver Electrode and Application in Analysis
    YE Bao-Xian, ZHOU Xing-Yao
    1996, 17(1):  33-37. 
    Asbtract ( )   PDF (619KB) ( )  
    Related Articles | Metrics
    This paper reports the electrochemical behaviour of hemoglobin at bare silver electrode.In the potential range of 0.4～-0.2 V(vs.SCE),a pair of redox peaks was observedat +0.26 V(oxidation) and +0.01 V(reduction)respectively at the sweep rate of 20 mV/swith an apparent electron-transfer rate constant(Ks)0.032 s-1and electron-transfer number(n)0.94.The redox reaction showed such a good stability that the currents changed lessthan0.2 μAunder a continued scan for 30 min,Hemoglobin was adsorped on the electrodesurface,but it was a faint adsorption.The electrode surface was not be stained during theredox reaction,In the medium of 0.1 mol/L NaAc-HAc(pH=4.5),both oxided current andreduced current are linear relationship with the concentration of hemoglobin in the ranges of2×10-7～2×10-6mol/Land 2×100-5～1.5×10-5mol/L.It can be used as a method for de-termining hemoglobin.
    Studies on the Coupling Technique Between High PerformanceCapillary Electrophoresis and Charge-Coupled Device Detector(Ⅲ)──Quantitative Calculation Methods
    XIONG Shao-Xiang, LI Jian-Jun, CNENG Jie-Ke
    1996, 17(1):  38-41. 
    Asbtract ( )   PDF (318KB) ( )  
    Related Articles | Metrics
    This paper reports two calculation methods,namely,sum peak height and peakvolume,for quantitative calculation of multi- wavelength electropherogram.The three-di-mensional electropherogram,on which the quanlitative messages are obtained,is translatedinto a two-dimensional electropherogram by the use of such data processing procedures assummation of data in fluorescence spectra and so on,and the quantitative calculation is per-formed. The sensitivity of detection,signal to noise ratio, accuracy and precision of calculation result are therefore enhanced.
    The Study of Electrochemistry at Low Temperature(Ⅰ)──Instrumentation and Its Features
    DIAO Guo-Wang, LI Liang, ZHANG Zu-Xun
    1996, 17(1):  42-45. 
    Asbtract ( )   PDF (2508KB) ( )  
    Related Articles | Metrics
    Alow-temperature thermostat and a low-temperature electrochemical cell havebeen designed. At different temperature the voltammograms have been recorded by BAS 100B electrochemical analyser.The diffusion coefficients Dof ferrocene at different temperature have been evaluated.The relationship between lgDand 1/Tis a straight line.The dif-fusion activation energy Ed of ferrocene is determined as 8.8 kJ/mol. The experimental results show that the system described in this paper is very effective for electrochemical experiments.
    Sensitized Room Temperature Phosphorimetry ofα-Bromo-naphthalene by Benzophenone in Aerated β-Cyclodextrin Solution
    XIE Jian-Wei, XU Jin-Gou, CNEN Guo-Zhen, Chang-Song
    1996, 17(1):  46-48. 
    Asbtract ( )   PDF (316KB) ( )  
    Related Articles | Metrics
    The sensitized α-bromonaphthene room temperature phosphorimetry by ben-zophenone in aerated β-cyclodextrin solution is presented. The room temperture phosphores-cence is observed when benzophenone is introduced into aqueous solution containing α-bromonaphthalene and β-cyclodextrin. The results show tht the phosphorescence enhance-ment induced by benzophenone is related to the function of benzophenone as both sensitizingand space-filling agents.The affecting factors on room temperature phosphorescence havebeen studied. The linear dynamic range between the concentration of α-bromonaphthaleneand the phosphorescence intensity is 0-4×10-5 mol/L.The detection limit is 1.09× 10-9mol/L. The method has been applied to the detection of α-bromonaphthalene in artificialmixture containing α-and β-bromonaphthalene, naphthalene,phenanthrene.
    Studies on Fluotimetrid Reaction of Salicylaldehyde Benzalhydrazone with Copper and Its Application
    JIANG Chong-Qiu, TANG Bo, FU Nong-Yan, CAO Hong, ZHANG Xiao-Gang
    1996, 17(1):  49-51. 
    Asbtract ( )   PDF (203KB) ( )  
    Related Articles | Metrics
    Anew fluorimetric reagent, salicylaldehyde benzalhydrazone has been established.The fluorimetric reaction of the reagent with copper was carried out in aqueous medium at pH=9.0 and studied in detail. The fluorescence excitation and emission wave-lengthsof the complex are 300 nm and 410 nm respectively. The linear range is 0.0～0.8 μm/10mL,the detection limit is 12. 4 ng/mLand the molar ratio of copper to the reagent is 1:1.The method has been applied to the determination of trace copper in tea and hair with satisfactory results.
    Immobilization of Glucose Oxidase onto regenerated Silk Fibroin and Its Application to Glucose Sensor
    QIAN Jiang-Nong, LIU Yong-Cheng, LIU Hai-Ying, YU Tong-Yin, DENG Jia-Qi
    1996, 17(1):  52-54. 
    Asbtract ( )   PDF (346KB) ( )  
    Related Articles | Metrics
    Glucose oxidase was immobilized onto regenerated silk fibroin membrane and themorphology of the blend membrane of the two kinds of macromolecules was investigatedwith SEM. The glucose sensor based on the immobilized enzyme exhibited a high sensitivity,perfect stability and long lifetime.
    Enzymatic Synthesis of Peptides Using N-Protected Racemic Amino Acides as Carboxyl Components
    TIAN Gui-Ling, LIU Ying, WANG Hong, Ye Yun-Hua
    1996, 17(1):  55-59. 
    Asbtract ( )   PDF (392KB) ( )  
    Related Articles | Metrics
    Condensation of the N-Z-or N-Boc-protected DL-amino acids(or esters)withGlyNHNHPh in the presence of papain at pH=5.0(or 8.2)or α-chymotrypsin at pH=10.0formed the expected optically active protected oligopeptides. The reaction was carried out inan aqueous-organic mixed solvent system and non-aqueous solvent system.These results indicate that the amino acid ester as acyl donor was better than the corresponding acid.The GlyNHNHPh as nucleophilic reagent was better than the correspondingester. Both thermal and storage stabilities of α- chymotrypsin are greatly enhanced in nonaqueous solvents compared with water system.The enzymatic peptide synthesis could alsobe carried out in dichloromethane with micro essential water(0.25%)and satisfactory results could be obtained.
    Kinetics and Mechanism of Oxidation of α-Aminino Acids by N-bromosuccinimiole
    MA Ke-Qh, YUAN Wei-Sen, SHANG Zhen-Feng, ZHAO Xue-Zhuang
    1996, 17(1):  60-64. 
    Asbtract ( )   PDF (342KB) ( )  
    Related Articles | Metrics
    The kinetics of the oxidtive decarboxylation of amino acids promoted by-bro-mosuccinimole(NBS)has been studied hy spectrophotometry in aqueous acid and alkalinemedium.The reaction was first order in NBS, and fractional order in amino acids.It wasfound that the pseudo first-order([AA]0»[NBS]0 rate constants decreases with the in-crease of[OH-](see Fig.2), and ionic strength and diffusion have no effect on the rate con-stants. Based on the experimental results, a mechanism involving the formatin of an inter-mediate, its slow decomposition to an imine,and subsequent rapid conversion of imine toproducts is proposed and the derived rate law was in good agreement with the experimentalobservations and the preequilidrium constants, rate constant of the rate-determining step to-gether with the activation parameters were evaluated.
    The Relationshiop Between Bichiral Amino Alcohol(Salicylaldimino)Copper Complexes and Enantioselectivities of Cyclopropanation
    WANG Min, NU Bing-Fang, W. Kraus
    1996, 17(1):  65-68. 
    Asbtract ( )   PDF (277KB) ( )  
    Related Articles | Metrics
    The enantioselective cyclopropanation of olefins olefins and ethyl diazoacetate underbichral amino alcohol salicylaldimino-copper complexes was studied.The resuls show thatthe main effect on the enantioselectivity is the configuration of the carbon attached to nitro-gen atom,the R-(N-C)-configuration catalyst produces the excess of the 1R-cyclopropaneproduct and the S-(N-C)-configuration catalyst produces the excess of the 1S-cyclopropaneproduct.The configuration of the carbon attached to oxygen atom also has effect on theenantioselectivety of reaction, but this is not the major one.
    Studies on the Structure and Properties of N1′-Methyl Indirubin Monooxime
    TIAN Fa-An, GONG Kao-Cai, LI Chun-Min
    1996, 17(1):  69-72. 
    Asbtract ( )   PDF (417KB) ( )  
    Related Articles | Metrics
    In this paper the synthesis,crystalline structure and properties of N1′-methyl in-dirubin monooxime(MIM)are reported.The antileukemic activity was determined by themethylene blue method in vitro and proved to be better than that of indirubin clearly. Its wa-ter-solubility and fat-solubility power are better than those of indirubin, Crystalline structure of MIMwas determined by X-ray diffraction method.The crystalline composition C17H13N3O2,Mr=291.21.The crystal is monoclinic,space group P21/c, with a=1.5226(4) nm,b=0. 6524(3)nm,c=1.6562(5) nm:β=103.69(4)°,Z=4.The final deviation factor R=0.043.The molecule is approximately planar.
    The Chemistry of α-Oxo Ketene Cyclic Dithioacetals (XXV)──Synthesis of Hydroxyethyl Arylthio Ethers via Substitution-Cycloaromatization Reaction
    LIU Qun, ZHAO Hong-Wu, YANG Zhi-Yun, XU Bai-Ling
    1996, 17(1):  73-76. 
    Asbtract ( )   PDF (2480KB) ( )  
    Related Articles | Metrics
    The addition of β,β-1,3-propylenedithio-α,β-unsaturated ketones 1 with methallyl Grignard reagent yielded carhinols 2.Catalyzed by mercuric chloride,carbinols 2 wereconverted to hydroxyethyl arylthio ethers 3 in the solvent of mercaptoethanol.When cat-alyzed by sulfuric acid, carbinols 2 were converted to α,β-unsaturated cyclohexanones 4.This conversion provides a new methd to the synthetesis of compound 4 and its analogues.
    Immobilization of P-Aminobenzamidine on Polymerized Liposome and Its Afrinity Adsorption for Typsin
    YU Kai, SUN Yan, HU Zhong-Ding, ZHOU Xiu-Zhong
    1996, 17(1):  77-80. 
    Asbtract ( )   PDF (309KB) ( )  
    Related Articles | Metrics
    p-Aminobenzamidine was immobilized on polymerized liposome of pentacosa-10,12-diyne-1-o1-phosphoryl ethanolamine by direct and indirect metholds. Affinity adsorptionof PL-PAB for trypsin was studied.
    Studies on Solid State Reaction of 1-Phenyl-3-methyl-5-Pyrazolone with Dicarbonyl Compounds
    DU Da-Ming, WANG Yong-Mei, MENG Shuang-Ming, LIANG Shu-Sen, MENG Ji-Ben, ZHOU Xiu-Zhong
    1996, 17(1):  81-84. 
    Asbtract ( )   PDF (293KB) ( )  
    Related Articles | Metrics
    The solid state reactions of benzil,p-dimethylaminobenzil,4,4′-dibromobenzil,p-dimethylaminobenzoin and o-phthalimide with 1-phenyl-3-methyl-5-pyrazolone were re-ported. This thermal reaction was carried out at 120℃ for 0.5hand gave one of the 1:1condensation isomers in a higher selectivity. The structures of seven new products wereidentified by IR,1HNMR, MSand elementary analysis, and the configuration of the prod-uct 1-phenyl-3-methyl-4-benzoylphenylmethylene-5-pyrazolone 1 was determined by X-raydiffraction analysis. In the molecule of compound 1, there is four plans rather than coplanar.Benzoyl group and COgroup of five membered ring are in cis-positions, the interaction ofoxygen atoms leads to noncoplanar.
    Total Synthesis of 3,7,11-Trimethyl-10-Oxo-Dodecanoic Acid
    LIYing, HUANG Chu-Sheng, LI Wei-Dong, LI Yu-Lin
    1996, 17(1):  85-87. 
    Asbtract ( )   PDF (228KB) ( )  
    Related Articles | Metrics
    The title compound,3,7,11-trimethyl-10-oxo-dodecanoic acid,a new sesquiter-pene isolated from Caulerpa recemosa was synthesized through eight steps starting fromgeraniol in an overall yield of 18.5%,The key step was the regioselective alkylation ofmethyl isopropyl ketone.
    Synthesis and Structure of 1:1 Complex of EthylphenyltinDichloride with N-4-Methoxyphenyl-2-hydroxynaphthylideneimine
    LIU Bao-Dian, BAO Ming, SUN Zhen-Gang, HE Qing-Lin, XING Yan, JIA Heng-Qing, LIN Yong-Hua
    1996, 17(1):  88-90. 
    Asbtract ( )   PDF (285KB) ( )  
    Related Articles | Metrics
    A novel or ganotin complex,EtPhSnCl2·2HOC10H6CH=NC6H4OCH3 was syn-thesized,and its crystal struct ure was determined by X-ray diffraction method.The crystalis triclinic,belonging to space group P1 with unit cell parameters a=1.1508(5)nm,b=1.1534(5)nm,c=1.0046(3)nm,a=94,15(3)°,β=115.47(3)°,r=85.94(4)°,V=1.1997(1) nm3,Z=2,Dc=1.68 g/cm3,μ=13.20 cm-1,F(000)=618 for 4131 reflections.R=0.047,Rw=0.047.The ligand coordinates to tin atom via phenolic oxygen atom.The complex has a distored trigonal bipyramidal structure,the phenolic oxygen atom of theligand and one of two chlorine atoms occupy the axial position. The distance between non-coodinated nitrogen atom with phenolic oxygen atom is0.2574 nm,which indicates that theintramolecular hydrogen bond of Schiff base ligand is retained in the complex.
    Study on Schiff Base That Has Hormone Activity(Ⅰ)──Synthesis and Activity on Schiff Base or Phenoxyacetic Acid
    WANG Yan-Gang, YE Wen-Fa, YIN Da-Xue, HUANG Jun-Min, LU Ai-Hong
    1996, 17(1):  91-93. 
    Asbtract ( )   PDF (217KB) ( )  
    Related Articles | Metrics
    Thirteen new Schiff bases have been synthesized from p-aminophenoxy acetic acidand aromatic aldehydes.Their structures were originally characterized by UV,IR,1H NMRand elementary analysis,It is found from the results of biological tests that compounds Ⅱd,Ⅱf,Ⅱg,Ⅱi,Ⅱj,Ⅱk and Ⅱm have marked activity on plant growth hormones.
    Reaction of 3-(2-Oxocloalkyl)Propionic Acid and(R)-2-Thioxothiazolidine-4-carboxylic Ethyl Ester
    LI Ye-Zhi, TIAN Yan-Qing, HUANG Hua-Min
    1996, 17(1):  94-96. 
    Asbtract ( )   PDF (236KB) ( )  
    Related Articles | Metrics
    he equimolar reaction of 3-(2-oxocyclohexyl)propionic acid or 3-(2-oxocy-clopentyl) propionic acid and(R)-2-thioxothiazolidine-4-carboxyli ethyl ester (1)with N-methyl-2-chloropyridium salt in the presence of triethylamine produced the corresponding op-tically active N-3-(2-oxocycloalkyl) propionyl-2-thioxothiazolidine-4-carboxylic ethyl ester(2a) and N-3-(2-oxocyclopentyl)propionyl-2-thioazolidine-4-carboxylic ethyl ester(2b).When the molar ratio of 3-(2-oxocyclohexyl)-propionic acid to compounds 1 is 2:1,2a andS-excess 3-(2-oxocyclohexyl)propionic acid were obtained.When 2a and 2b react withracemic a-phenylethylamine(molar ratio 1:2),the photoactive compound N-3-(2-oxocyclo-hexyl)propionyl-α-phenylethylaine(5a)or N-3-(2-oxocyclopentyl)propionyl-α-phenylethyla-mine(5b)were obtained.
    MOVS Method for Preparation of Heterogeneous Catalysts
    HE Da-Sen, XU Feng, ZHAO Lei-Hong, LI Shi-Jiao, E. C. Alyea
    1996, 17(1):  97-101. 
    Asbtract ( )   PDF (488KB) ( )  
    Related Articles | Metrics
    MOVS(Metal oxide vapour synthesis) method for preparation of heterogeneouscatalysts was described.The MoO3 based MOVScatalysts exhibited much higher activitiescompared to the analogous non- MOVScatalysts respectively in partial oxidation of methanolto formaldehyde,synthesis of higher alcohols or quinoline HDN.The relationship betweenthe catalytic behavior and intrinsic properties of MOVScatalysts and some aspects for application of the MOVSmethod were also discussed.
    Synergistic Mechanism of Ethane and Ethene over Zn/HZSM-5 Zeolite
    CAO Rong, ZHAO Hong, CHENG Mo-Jie, YANG Ya-Shu
    1996, 17(1):  102-106. 
    Asbtract ( )   PDF (377KB) ( )  
    Related Articles | Metrics
    The characteristic features of acidic species and metallic lewis species in HZSM-5,Zn/HZSM-5,NaHZSM-5and NaZnHZSM-5have been studied by using the chemical andphysical methods of NH3-TPD,IR-OH,Py-IR,CO-IRand XPS. The aromatization ofethane and ethene has been investigated over the catalysts.It is evidenced that a new kind ofactive sites──Zn2+-Lacid center was formed which lead to the decrease ofBr0wnsted acidof ZSM-5 zeolite.Zn2+-Lacid is found to be a strong acid center.Impregnation of NaOHonzeolites also leads to the decrease of Brownsted acid.The aromatization selectivity and activi-ty of ethane and ethene have a close relation with bifunctional center of Zn2+-Lacid andBrownsted acid and there is an optimum balance between the metal content and Brownstedacid.Therefore,there exists an optimum zinc content in Zn/HZSM-5 catalysts during thearomatization of ethane and ethene.
    The Interaction Between Fluorocarbon and Hydrocasrbon Surfactants in mixed Mixed Monolayers
    ZHANG Lan-Hui, ZHU Bu-Yao, ZHAO Guo-Xi
    1996, 17(1):  107-111. 
    Asbtract ( )   PDF (510KB) ( )  
    Related Articles | Metrics
    In consideration of the similarity of insoluble monolayers and soluble monolayers,amolecular interaction parameter(β)was introduced to describe the nonideality of the mixedinsoluble monolayers. From the surface pressure-area isotherms of “6201”/C18SO4Na mix-tures,a high molecular interaction parameter which was closed to the critical value 2.0 wasobtained,which has further verified the previous guess that a phase separation took place ata higher surface pressure.
    The Electronic Structure of Uronium Salts and Its Relationship to Their Spectrum and Binding Energy
    XIAO Shen-Xiu, CHEN Tian-Lang, LI Ping, LI Li
    1996, 17(1):  112-116. 
    Asbtract ( )   PDF (423KB) ( )  
    Related Articles | Metrics
    By researching vibrational,ultraviolet adsorption bands and XPSbinding energy,and calculating electronic structure with self-consistent-charge DV-Xa method,the structural characteristics of uronium ion CO(NH2)2H+ had been obtained and the relationship be-tween structural variation and IR,UV adsorption bands had been analyzed.Therefore,thereactive mechanism of coordination covalent bond formation is to he raised.
    An Ab Initio Study of 3,4-Dithiosquaric Acid
    ZHOU Li-Xin, TIAN An-Min, LI Ju-Cai, CHEN Yi-Zhao, YAN Guo-Sen
    1996, 17(1):  117-120. 
    Asbtract ( )   PDF (339KB) ( )  
    Related Articles | Metrics
    Ab initio SCFcalculations of 3,4-dithiosquaric acid are reported in this paper.TheZZisomer was found to be the most stable one among the three planar isomers. Anisodesmic energy analysis has been carried out at the HF 6-31G*//6-31G* level for these planar isomers,and they have positive isodesmic energies or small negative ones,suggesting that 3,4-dithiosquaric acid is not aromatic possibly.Vibrational frequency has been calculated for the three isomers of 3,4-dithiosquaric acid
    Quantum Chemicasl Study on the Isomerization of Difluorethyne,FCCF
    LIXue-Kui, XU Ming, SUN Chia-Chung
    1996, 17(1):  121-125. 
    Asbtract ( )   PDF (438KB) ( )  
    Related Articles | Metrics
    The isomerization( F2CC─→FCCF)of F2C2 is studied by using an ab initiomethod.The geometries of reactant,product and transition state for the isomerization reaction from F2CCto FC≡CFare optimized by using the energy gradient technique at the levels of H/6-31Gand MP2/6-31G. The tracing of reaction has been performed by using themethod of the IRC.
    Catalytic Activity of Dawson-Molybdovanadophosphoric in Phenol Hydroxylation with Hydrogen Peroxide
    YU Jian-Feng, YANG Yu, WU Tong-Hao, SUN Chia-Chung
    1996, 17(1):  126-128. 
    Asbtract ( )   PDF (301KB) ( )  
    Related Articles | Metrics
    Molybdovanadophosphoric compounds with Dawson structure were synthesizedand used to hydroxylate phenol with hydrogen peroxide.The vibrational spectroscopy and￣(31)P NMRwere used to characterize their structures.The experimental results indicated thatthe heteropoly compounds with Dawson structure were excellent catalysts for the hydroxylation of phenol.Ahigher selectivity of single isomer can be obtained at the higher molar ratioof phenol to hydrogen peroxide.
    CFPHGLF Method Including the Two-body Potential Harmonics
    WANG Yi-Xuan, DENG Cong-Hao
    1996, 17(1):  129-130. 
    Asbtract ( )   PDF (150KB) ( )  
    Related Articles | Metrics
    Introducing the potential harmonics for the two-body correlation,we modified thecorrelation-function potential-harmonic generalized Laguerre function method (CFPHGLF)previously proposed by us.The new CFPHGLFyields much more accurate eigenenergy forthe ground state 1lS,and slightly better eigenenergies for the excited states 2 lS,3 lS and 4 lSof the helium atom than the original CFPHGLF.
    Studies on the Chemisorption of Co,H2 and Their Interaction on Amorphous Alloy Catalysts Using TPD-MS
    ZHANG Yu, ZHENG Xiao-Ming, ZHOU Lie-Hua
    1996, 17(1):  131-133. 
    Asbtract ( )   PDF (215KB) ( )  
    Related Articles | Metrics
    The amorphous alloy catalysts of Ni-Band Co-Bwere prepared by chemical reduction method.XRDand DSCmethods were used to verify the amorphous state of Ni-BandCo-Band the content was analyzed by using inductively coupled plasma(ICP).The catalyticactivity for hydrogenation of COon Co-Bwas higher than that of Ni-B.The chemisorptionof COand H2 and their interaction on Ni(Co)-Bwerestudied by using TPD-MS.It wasfound that there were one or two kinds of sorption states on the two catalysts for H2 and COrespectively.The intensity and quantity of sorption states were different for different amorphous alloys.
    Formation of Micelles and Vesicles of Hydrocarbon and Fluorocarbon Surfactants Mixtures
    DING Hui-Jun, DAI Qun-Ying, ZHANG Lan-Hui, ZHAO Guo-Xi
    1996, 17(1):  134-136. 
    Asbtract ( )   PDF (258KB) ( )  
    Related Articles | Metrics
    The formation of micelles and vesicles of hydrocarbon and fluorocarbon surfactants mixtures has been studied by using the surface tension method,TEMand DSC.It wasshown that the fluorocarbon alcohol increased the surface activity and decreased the micellecounterion binding degree when mixed with cationic surfactants.Both the mixed anionic-cationic surfactant system and the mixed fluorocarbon alcohol-cationie surfactant systemcould all form vesicle,but it was more difficult for the latter to do so.The fluorocarbonchin made the peak temperature of phase inversion higher and the range broader.The sizeof polar group of surfactant affects the stability of vesicle to the certain content.
    Studies on the Copolymerization of Chloromethylthiirane with Propylene Oxide by Rare Earth Coordination Catalysts
    SUN Wei-Lin, SNEN Zhi-Quan, ZHANG Yi-Feng
    1996, 17(1):  137-141. 
    Asbtract ( )   PDF (374KB) ( )  
    Related Articles | Metrics
    The copolymerization of chloromethylthiirane (CMT)with propylene oxide (PO)was investigated by using rare earth coordination catalysts for the first time.It has been discovered that rare earth coordination catalysts,especially Y(P204)3-Al(i-Bu)3-H2Osystem,are effective catalysts for preparing high molecular weight([η]about 1.0 dL/g)CMT-POcopolymer in a high yield(50%).The catalytic efficiency of Y(P204)3-Al(i-Bu)3-H2Osystemreached 6000 g/mol Y. The copolymer structure was also characterized by IR,NMR,GPC.The reactivity ratio CMT(1)and PO(2) were obtained as r1=0.41 and r2=1.37 respective-ly.
    Preparation of Polystyrylviologen Resins and Their Application as Electron-Transfer Catalysts in the Reduction of 2-Chloronitrobenzene
    LIU Fu-Tian, LI Hong, HE Bing-Lin
    1996, 17(1):  142-146. 
    Asbtract ( )   PDF (446KB) ( )  
    Related Articles | Metrics
    Anew method for preparing polystyrylviologen resins was reported in this paper.The polystyrylviologen resins were obtained by the reactions of chloromethylated polystyrenewith 4,4'-bipyridine,then with benzyl chloride.The obtained resins were used as electron-transfer catalysts in the reduction of 2-chloronitrobenzene.Experimental results showed thatthe resins with viologen moieties have abilities to mediate the reduction of 2-chloroni-trobenzene at room temperature,affording 2-chloroaniline,and the structure of the resinscan also affect their electron-transfer catalytic activities. The resins can be reused.
    Preparation of Dextran Magmetoc Nanoparticles
    LI Min-Qin, XU Hui-Xian, HE Bing-Lin
    1996, 17(1):  147-150. 
    Asbtract ( )   PDF (288KB) ( )  
    Related Articles | Metrics
    Superparamagnetic dextran magnetic nanoparticles were prepared by coprecipita-tion.The nanoparticles were separated by gel filtration chromatography and centrifugation.In the course of preparation of dextran magnetic nanoparticles,increase of dextran concentration resulted in decrease of magnetic susceptibility,but increase of amount of ironic saltsand concentration of ammonium hydroxide caused magnetic susceptibility increase. When Fe3+)/Fe2+ molar ratio was between 2～0.5, magnetic susceptibility of dextran magneticnanoparticles was larger.Co2+could replace Fe2+during the preparation.
    The Synthesis and Properties of Anion Exchange Resin DEA-PVT Supported by Crosslinked Poly(vinyl alcohol)
    XU Li-Zhong, MA Jian-Biao, HE Bing-Lin
    1996, 17(1):  151-155. 
    Asbtract ( )   PDF (389KB) ( )  
    Related Articles | Metrics
    An anion exchange resin with diethylamino groups supported by cross-linked poly(vinyl alcohol)was synthesized from poly(vinyl acetate-co-triallyl isocyanurate)in threesteps.Its chemical and physical structures,properties,and thermal stability were studied indetails.The results showed that the anion exchanger was suitable for the separation of pro-teins or enzymes.
    Studies on Copolymerization of Poly (ethylene oxide )Macromer and Methyl Methacrylate with Their Copolymers
    GUO Sheng-Rong, FENG Lin-Xian, YU Xiao-Jie, YANG Shi-Lin
    1996, 17(1):  156-159. 
    Asbtract ( )   PDF (2468KB) ( )  
    Related Articles | Metrics
    Copolymerization of α-methacryloyl-ω-poly(ethylene oxide)(PEO)macromers with methyl methacrylate(MMA)in toluene using AIBNas initiator was studied.The effects of amount of initiator,total monomer concentration,reaction time and chargingratio of the macromer to MMAon the composition and molecular weight of the graft copolymer were studied.The purified copolymer was characterized with IR,1H NMR,DSCandGPC. Microphase separated structure of the copolymer was observed with TEMand the an-tithrombogenic properties were evaluated.
    Studies on the Ordeer-Disorder Transition in Reversed Duckweed Polymeric LB Films
    LI Hong-Bin, ZHANG Xi, ZHANG Rui-Feng, ZHAO Bing, XU Wei-Qing, SHEN Jia-Cong, GAO Zhong-Min
    1996, 17(1):  160-161. 
    Asbtract ( )   PDF (218KB) ( )  
    Related Articles | Metrics
    The order-disorder transition in“Reversed Duckweed”type polymeric LBfilmwas investigated by temperature-dependent infrared transmition and X-rav diffraction. Threesteps of melting process were obtserved :the first and second steps were reversible transitionscorresponding to the disorder of the alkyl chains in each layer,and the layer structure wasmaintained;the third was an irreversible transition corresponding to the melting of the two-dimension system,and the layer structure was damaged during this phase transition process.
    The Staility of Polyme Doped Dye Electroluminescent Material in Excited State
    TIAN Wen-Jing, MA Yu-Guang, XUE Shan-Hua, LIU Shi-Yong, SHEN Jia-Cong
    1996, 17(1):  162-164. 
    Asbtract ( )   PDF (228KB) ( )  
    Related Articles | Metrics
    The stability of a kind of polymer:dye complex film was studied by using fluorescent spectra and UV-Vis spectra.The fluorescent intensity of the complex film hardlychanges in vacuum and reduces obviously in the air.It concluded that the dye in the excitedstate could be easy to react with the oxygen in the air,so as to produce the single-state oxygen and lose its lighting property seriously. And it was important to seal the device in orderto cut off from the oxygen during the fabrication and application.
    Group Transfer Copolymerization of MMA and BPMA
    ZOU You-Si, LIN Guo-Liang, YAO Qing-Qing, PAN Rong-Hua
    1996, 17(1):  165-167. 
    Asbtract ( )   PDF (263KB) ( )  
    Related Articles | Metrics
    Methyl methacrylate(MMA) was random copolymerized with biphenyl methacrylate via group transfer polymerization.The copolymer composition was measured by 1HNMR,the thermal behaviour of these copolymer was determined by DSC. The reactivity ra-tios were r1=0.56±0.03,0.52±0.03,0.46±0.03 and r2=0.79±0.03,0.81±0.03,0.85±0.03 in benzene,tetrahydrofuran and acetonitrile respectively at 30℃. Copolymers withnarrow molecular weight distribution and predetermined molecular weight were obtained.
Special Issues
More...
Download
More...
Links
More...