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    24 March 1994, Volume 15 Issue 3
    Articles
    Solid-State Synthesis and Crystal Structure of Cubic-Type Cluster Complex[Bu4N]3[WAg3S4I4]
    TANG Ka-Luo, NI HAi-Hong, JIN Xiang-Lin, TANG You-Qi
    1994, 15(3):  315-318. 
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    The title compound was prepared from the solid-state reaction of (NH4)2WS4,AgIand Bu4NBr at low-heating temperature(90℃), then crystallized from CH2Cl2/acetone/n-pentane(1:2 :2).The orange crystal belongs to the cubic system with space group P43m,a=b=c=1.2304(2)nm,V=1.8629(9)nm3,Dc=1.69 g/cm3,Z=1.The final Ris 0.0835 for 270 reflections.The anion core of the title compound can be considered as a cubic skeleton composed of one Mo atom,three Ag atoms,four Satoms and one Iatom which are arranged in disorder.
    Synthesis, Crystal and Molecular Structure of Complex[Cu2(Gly-GlyO)2(4, 4'-bpy)(OH)2]·9H2O
    WANG Feng-Shan, CUI Ai-Li, CHEN Hai-Ming, ZHAO Ya-Juan
    1994, 15(3):  319-322. 
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    A novel binuclear cupric complex with Gly-GlyO chelate ring and 4, 4'-dipyridyl as an intermediate radical was synthesized by the reaction of Gly-GlyO,4, 4'-dipyridyl and cupric nitrate in aqueous solution.The structural formula of the complex was confirmed as [(H2NCH2CONHCH2COO)Cu(OH)(C10H8N2)Cu(OH)(H2NCH2CONHCH2COO)]·9H2Oby X-ray single-crystal structure analysis.Crystallographic data are as follows:a triclinic system with a space group P1,a=1.1412 nm,b=1.2298 nm,c=1.4269 nm, a=113.83°,β=101.91°,γ=103.64°, Z=2.The diffraction data were collected on a Nicolet XRS R3Diffractometer.The structural data were refined by the block matrix least squares program to final Rvalue of 0.068 and Rw value of 0.057.
    Synthesis and Properties of Tetrabasic Transition Elements Tungstovanadophosphate Heteropoly Complexes with Dawson Structure
    WANG Xiao-Guang, WU Cheng-Jian, SHAN Yong-Kui, LIU Zong-Xu
    1994, 15(3):  323-327. 
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    Two series of twelve title complexes were synthesized for the first time.Their general molecular formulas were determined as:K9,10[(P2M(H2O) W15V2O61]·xH2Oand K10,11[P2M(H2O)W14V3O61]·xH2O(M= Fe3+,Co3+,Ni2+,Mn2+,Cu2+,Zn2+).The data of IR, UVspectra of all the products and their characteristic absorption peaks were provided.Especially for the compounds with phosphorus as the central atom, the relationship between the structure and chemical shift was explained by means of 31P and 51V NMR spectra.ESRspectra were used to explain their electronic features.The X-ray diffraction data indicate that all the complexes still remain basically characteristic of the Dawson structure.The stabilities of heteropoly complexes were also studied simultaneously.
    Syntheses and Characterizations of Complexes Tetrahydrofurfurylcyclopentadienyl Lanthanide Chloride
    ZHANG Suo-Bo, LIU Ju-Zheng, ZHUANG Xiu-Li, WEI Ge-Cheng, CHEN Wen-Qi
    1994, 15(3):  328-331. 
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    The syntheses and characterizations of tetrahydrofurfurylcyclopentadienyl lanthanide chloride complexes are reported.The complexes(C4H7OCH2C5H4)2LnCl(Ln=Nd,Gd,Dy, Er) were characterized by elementary analyses, IR, MSand 1H NMR.The crystal structure of(C4H7OCH2C5H4)2DyCl was determined by X-ray diffraction analysis.The crystal belongs to an orthorhombic system with a space group P212121,a=1.1809(3)nm,b=1.2149(4)nm,c=1.3377(5)nm,Z=4,Dc=1.72g/cm3,R=0.034,Rw=0.037.
    Synthesis and Magnetic Properties of Trinuclear Copper(Ⅱ)Complexes Containing μ-4, 4'-Bipyridine
    HAO Song-Qi, ZHANG Xiao-Li, JIANG Zong-Hui, LIAO Dai-Zheng, YAN Shi-Ping, WANG Geng-Lin
    1994, 15(3):  332-335. 
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    Three new cyclic trinuclear copper(Ⅱ) complexes containing4,4' -bipyridine(4,4' -bpy) which acts as the bridging ligand were synthesized, namely [Cu3 (4, 4' -bpy)3(phen)3] (ClO4)6 ·2H2O (1; phen= O-phenanthroline),[Cu3 (4, 4'-bpy)3 (bpy)3] (ClO4)6·H2O (2; bpy=2, 2'-bipyridyl),and [Cu3(4,4' -bpy)3(NO2-phen)3] (ClO4)6·6H2O (3; NO2-phen=5-nitro-o-phenanthroline).Based on IR,elemental analyses, conductivity measurement, electronic spectra, ESRand susceptibility these complexes are proposed to have extended 4, 4' -bipyridine-bridged structure with Cu (Ⅱ) in a distorted square environment.The variable-temperature magnetic susceptibilities of 1 and 3 have been measured (4-300K).Based on the Heisenberg model,the exchange parameter, J, was found to be -0.23cm-1 (for 1) ; -0.90 cm-1( for 3),indicating that a very weak antiferromagnetic spin exchange interaction occurs between the copper(Ⅱ) ions.
    Synthesis of Ru3(CO)12 Cluster in Zeolite NaY Using Ship-in-Bottle Technique
    XIAO Feng-Shou, XU Ru-Ren, HE Ya-Nan, DING Hong, ZHANG Yan-Qiu
    1994, 15(3):  336-338. 
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    NaYzeolite entrapped Ru3(CO)12 cluster has been synthesized from RuCl3 ion-exchanged NaY, which is well charactrized by IRand Raman spectroscopies and COchemisorption.The in situ IRspectrum exhibits the bands at 2060, 2040, 2017, 1990, and 1953 cm-1, which are closed to Ru3(CO)12 crystalline.Furthermore, the Raman results provide the bands at 150 and 185 cm-1, which are attributed to Ru-Ru bonds of the triruthenium carbonyl cluster.COchemisorption on Ru3/NaY gives a CO/Ru ratio of 3.85,which is similar to the stochiometry of Ru3(CO)12.
    Studies on the Degradation of Cefotaxime and Voltammetric Behaviour of Degradation Product
    LI Qi-Long, CHEN Shou-Ai, SHANG Jun
    1994, 15(3):  339-342. 
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    The degradation of cefotaxime was carried out in NaOHsolution at 100℃ for 20min.Asensitive reduction peak of degradation product was obtained by adsorptive stripping voltammetry in 0.1 mol/L NaOH, at accumulation time of 60 s.Ep=-0.78 V (vs.Ag/AgCl).ip is directly proportional to the concentration of cefotaxime over the range from 1.0×10-9 to 1.0×10-6 mol/L, with a detection limit of 5.0×10-10 mol/L.The voltammetric behaviour of degradation product has been studied.The parameters of electrode reaction have been determined.The mechanisms about the degradation and electrode reactions were discussed.
    Spectroelectrochemical Investigation on Basic Blue
    SHENB Bao-En, WANG Hua-WEi, PENG Tu-Zhi, WANG Guo-Shun
    1994, 15(3):  343-347. 
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    The electrochemical reduction of Basic Blue was investigated by means of thin-layer spectroelectrochemical technique at SnO2 film optically transparent electrode.The nearly reversible redox peaks of basic blue were shown on the thin layer cyclic voltammogram.Spectroscopic experiment found the cis-trans-tautomerism and the color change effect of basic blue.In the presence of Oxygen, a new peak appears on the cyclic voltammogram and on the spectrum.It was supposed that the basic blue and the oxygen molecule can form a charge transfer complex.The formal potentials and the electron transfer numbers as well as the diffusion coefficient of basic blue were determined by means of thin-layer spectroelectrochemical technique.The possible electrode process was discussed on the basis of these measurements.
    Polyaniline Modified Electrode Prepared by Galvanostatic at Low Current Density
    FANG Hui-Qun, LI Gen-xi, CHEN Hong-Yuan
    1994, 15(3):  348-351. 
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    The properties of polyaniline modified electrodes prepared by galvanostatic at low current density were studied.Advantages of the polymer-coated electrodes prepared at these conditions were also discussed.It was found that polyaniline film polymerized at low current density had good electron transfer.Not only have it a better ability of electrocatalysis to the redox reaction of Br- and Tl+/Tl, but also it has a good response to H+.
    Long-Chain Alkylthiouronium Derivatives as Carriers for Anion-Selective Electrode
    LIN Hui-Gai, LIU Ai-Ping, XIAO Dan, CAO Zhong, YU Ru-Qin
    1994, 15(3):  352-355. 
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    Aseries of long-chain alkylthiouronium derivative were synthesized and used as new type carriers for preparing anion-selective electrodes.The S-hexadecylpropenyl-thiouronium picrate(S-HPTP)showed the best performance among the carriers tested.The electrode based on this carriers compound exhibited linear response range of 1.0×10-2-3.9×10-7mol/L with a detection limit of 2.7×10-7mol/L of picrate ion.The selectivity of electrodes was examined, and the S-octadecylphenylthiouronium picrate(S-OPHTP)electrode was used for potentiometric titration of berberine.
    Voltammetric Behavior of Zeatin and Kinetin
    JIANG Zi-Wei, JIANG Tong-Bo, JU Chang-Qing, ZHANG Jie
    1994, 15(3):  356-359. 
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    In 0.1 mol/L HAc-NaAc solution, the polarographic reduction waves of zeatin and kinetin have been obtained.The electrode process was also disscussed.In the presence of zeatin or kinetin, the reduction potentials of some metalic ions were shifted.
    The New Numerical Method of Semiderivation for Convolution Voltammetry
    XIE Tian-Yao, MO Jin-Yuan
    1994, 15(3):  360-363. 
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    Two new arithmetic formulas Of semiderivation for convolution voltammetry were presented based on the semiderivative property.With the derived formulas, the current function of linear sweep voltammetry was discussed in non-dimensional level,and the results are in complete accord with the G1 equation's under the same given parameters.In addition,the proposed arithmetic would afford direct and clear theoretical evidence for studying the link between linear sweep voltammetry and staircase voltammetry.
    Determination of Very Long Chain Fatty Acids in Plasma by Capillary Gas Chromatography
    ZHANG Shu-Feng, CHANG Li-Wen
    1994, 15(3):  364-366. 
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    Capillary gas chromatographic method was employed for determining very long chain fatty acids in the plasma of patients with Adrenoleucodystrophy(ALD)and healthy controls.Very long chain fatty acids in the plasma were extracted and methylated with CH3OH-C6H6-CH3COCl.The very long chain fatty acids were separated on the SE-54 column.The ratio of C24:0to C22:0,C26:0 to C22:0 fatty acids was calculated.Abnormal ratios were observed in patient with ALD.The technique can be used for clinical diagnosis of ALD.
    Studies on a New Effect of Fluorescent Sensitization Based on the Formation of Heteropolynuclear Complex(Ⅱ) ──Fluorescences of the Co(Ⅱ)-7-(8-Hydroxy-3, 6-disulfonaphthylazo)-8-hydroxyquinoline-5-sulfonic acid-B(Ⅲ)System and Their Analytical Applicat
    XIONG Guo-Hua, LIU Hong, YU Ying, HUANG Jian-Feng
    1994, 15(3):  367-369. 
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    A new effect of fluorescent sensitization is studied.Co2+ can promote the complexation reaction between 7-(8-hydroxy-3,6-disulfonaphthylazo)-8-hydroxyquinoline-5-sulfonic acid(R) and boron(Ⅲ)(provided by B2O42-), and makes the fluorescent intensity increase but does not change the characteristic fluorescent spectrum.Our study show that it is the formation of heteropolynuclear complex CoR2B that makes the fluorescent sensitization.So, a fluoremetric analytical approach of cobalt has been established.It's linear range is 0-5.1×10-7mol/L Co2+, and the detection limit is 7.2×10-9mol/L.
    Non-Local Thermal Equilibrium in ICP-AES Ⅱ──Non-Saha Ionization Equilibrium Process
    YANG Peng-Yuan, WANG Xiao-Ru, YING Hai, WANG Zhi-Yong
    1994, 15(3):  370-372. 
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    Three parameters have been introduced to modify the Saha ionization equilibrium in a spectrochemical ICP.These parameters provide the necessary modifications for the temperature difference between heavier particles and electrons, for the emission from an opticalthin ICP, and for the ambipolar diffusion of ion-electron pairs, respectively.It is confirmed that the overpopulation of electron number density in the central channel of ICPis mainly caused by the ambipolar diffusion process.As a consequence, this process enhances the charge exchange process between argon ions and analyte atoms in the central channel,which is principally responsible for the overpopulated analyte ion number density.
    Studies on the Binding of Anthraquinones and Flavonoids to Human Serum Albumin
    ZHANG Bao-Lin, WANG Wen-Qing, BAI Feng-Lian
    1994, 15(3):  373-378. 
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    The binding of emodin, flavone,quercetin, naringin, baicalin and gentiopicrin to human serum albumin (HSA) was studied using fluorescence spectroscopy.It was shown that these compounds have a powerful ability to quench the HSAfluorescence via a nonradiative energy transfer mechanism except gentiopicrin.The fluorescence quenching data was analyzed according to Scatchard equation,and the binding constants in the range 104 to 5×105L/mol were obtained.It was found that the affinity of these compounds to HSAis positively related to their hydrophobicity.By use of a spectra overlap integral between the absorption spectrum of these compounds and the emission spectrum for HSA, the distance of Trp-214residue to the first binding site of these compounds was estimated.In addition, the competition binding of oleate with emodin and flavone, baicalin with emodin and quercetin was monitored by fluorescence quenching.The binding mechanism was discussed in brief and an allosteric domain model of emodin-HSAcomplex was postulated from above results.
    Studies on Structure and the Circular Dichroism of an Arabinogalactan from the Pollen of Papaver Somniferum
    MIAO Ping, HE Feng, JIN Sheng
    1994, 15(3):  379-382. 
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    A polysaccharide PS(1), which was purified from the pollen of papaver somniferum, is composed of arabinose and galactose residues with molar ratio of 1: 1.There are β(1→5), β(1→6), β(1→3, 6)galacpyranosyl and α(1→5), β(1→3) arabinofuranosyl residues in sugar chain, Circular dichrosim of several pollen polysaccharides have been studied.
    α-Oxo Ketene Cyclic Dithioacetal Chemistry(Ⅺ)──Preliminary Studies on the Addition Reaction of α-Oxo Ketene Cyclic Dithioacetals with Reformatsky Reagent
    LIU Qun, DONG De-wen, YANG Zhi-Yun, HU Yu-Lan, ZHANG Chang-Shan
    1994, 15(3):  383-386. 
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    The addition reactions of the title compounds with the Reformatsky reagent from ethyl bromoacetate were performed and the possible mechanism was discussed.It seems that the decisive factor for this reaction rest on the conformation of the acetal groups in substrate molecules.When the two alkylthio groups are or nearly on the plane,which relay on the structure of the acetal group and the molecule involved, the substrate carbonyl can be activated by the complex formed between substrate and Reformatsky reagent.Otherwise,the addition reaction would be difficult to occur.
    Stereoselective Synthesis of Hydroprene and Its(2Z, 4E)-Isomer via Arsonic Ylide
    LIU Tian-Lin, NI Chi-You, XIE Wen-Quan, LI Zheng-Ming
    1994, 15(3):  387-390. 
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    The key intermediate ethyl 4-bromo-3-methyl-( 2E)-butenoate 7 was obtained from ethyl 3-methyl-2-butenoate 4 by a sequence of reactions:trans-oxidation(SeO2), reduction and bromination, Reaction of 7 and triphenylarsine gave the arsonium salt 8.Finally, reaction of 8 and dihydrocitronellal in the presence of K2CO3-C2H5OH-trace H2O afforded hydroprene and its (2Z, 4E)-isomer in yield of 74%.The(4E)-selectivity and the partial inversion of C-2 double bond configuration happened in this reaction.
    Syntheses, Structures and SAR Study on New Sulfonylurea Compounds(Ⅳ)──Syntheses and Activity
    LI Zheng-Ming, JIA Guo-Feng, WANG Ling-Xiu, LAI Cheng-Ming
    1994, 15(3):  391-395. 
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    Seventeen new sulfonylurea compounds were synthesized.Their structures were confirmed by elemental analysis,1H NMR,and IR,and their molecular and crystal structures were discussed.The data of their herbicidal activity were reported, and the structureactivity relationship(SAR)was studied accordingly.
    Neolignan Glycosides from Pedicularis alaschanica
    GAO Jian-Jun, LIU Zi-Min, WANG Ji-he, JIA Zhong-Jian
    1994, 15(3):  396-397. 
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    Two new neolignan glycosides,alaschanioside Aand C,along with cirtusin Awere obtained by further studies on the ethanol extract of whole plants of Pedicularis alaschanica Maxim.On the basis of chemical evidence and spectral data,alaschanioside Aand Cwere elucidated as erythro isomeride of cirtusin Aand 4-O-β-D-glucosyl vladinol E, respectively.
    Application of FTIR Spectra to Study on the Influence of Various Substituted-Aniline on the Synthesis Reaction of O-Ethyl-isopropyl(substituted thiourea) thiophosphorylamidate
    HE Lan-Ling, LAI Cheng-Ming, LIN Chui, XU Jin-Min, WANG Yong-Tai, YANG Hua-Zheng, WU Ye
    1994, 15(3):  398-400. 
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    In this paper, the influence of substituent on the addition reaction of substitued aniline to O-ethyl-N-isopropyl(isothiocyano)thiophosphoramidate was studied, the relationship between rate constants and substituent constants is in accordance with Hammett relationship in our research region, and the reaction has been further discussed by means of MNDOcalculation.
    In Situ FTIR Reflection Spectroscopic Studies of Adsorption and Oxidation of Ethylene Glycol on Pt Electrode(Ⅰ)──Acidic Media
    CHEN Ai-Cheng, SUN Shi-Gang
    1994, 15(3):  401-405. 
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    The adsorption and oxidation of ethylene glycol(EG) on Pt electrodes were investigated by in situ FTIRspectroscopy and cyclic voltammetry, The results demonstrated that EGwas oxidized on Pt electrode in acidic media via a dual path reaction mechanism, i.e.EG may be oxidized into CO2 through the dissociative adsorbate(COad)and the reactive intermediates (mainly CH2OHCOOH and HOOC-COOH species).Based on the data of in situ FTIRexperiments, the present work revealed the origin of characters observed in cyclic voltammetric experiments concerning the adsorption and oxidation of EGon Pt electrode.
    Electronic Structure and Properties of Anisotropic Lattice Planes in LaNi5 and LaNi5D6
    ZHANG Xiao-Yi, LUO Hui-Lie
    1994, 15(3):  406-410. 
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    Three-dimensional structure of crystal model is resolved into two-dimensional structure to investigate the electronic structure and properties of anisotropic lattice planes in LaNi5 and LaNi5D6.The information concerning the differences of the electronic structure and the energy change in anisotropic lattice planes are obtained from a comparison and analysis of the calculation results by using the SCC-DV-Xa(Self-Consistent-Charge-Discrete-Variation-Xa) method.The activity of La5d electrons in some lattice plane direction such as the(110)and(110)is noteworthy.It is remarkable that there are certain relationship between some anisotropic physical properties and some anisotropic electronic structure of LaNi5 and its deuterides.
    Studies on the Surface Aminopropylsilanized Quartz by Contact Angle Method
    KONG Xiang-Xing, ZHANG Xi, GAO Mang-Lai, SHEN Jia-Cong
    1994, 15(3):  411-414. 
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    In this paper,the concentration of amino group onto aminopropylsilanized(APS)quartz was measured by using contact angle method.Using phenol as a probe, the weak acid (phenol in CH2I2 solution)/the base(APSquartz) adsorption was studied in detail, and the surface concentration of amino group on APSsurface was calculaled as 1.14 nm2/mole when the Langmuir isotherm was used.And further ,SAzoNC6OH acted as a probe, the surface adsorption concentration and molecular section area was indetified by using UV-visible absorption spectra.Comparing the area of per amino group of 0.41 nm2 from adsorption spectra measurement, a densed packing model, with hydrogen bonding existing between amino groups, was proposed.
    Molecular Orientational Motion Models and Calculation of Structural Phase Transitions Temperature in Solid C60
    XIN Hou-Wen, YANG Ling-Fa
    1994, 15(3):  415-417. 
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    The molecular orientational motion models in different regions of temperature have been proposed in solid C60 to study the mechanism of orientational phase transitions.In terms of these models, the temperatures Tc and Tg are calculated for the transition from facecentred-cubic to simple-cubic lattice and the glass transition respectively, which agree well with the results of experiments.
    Ab initio Studies on Stabilities for BnXn0,2-(X=H,Cl;n=4,6,8,9,10,12)
    YU Wei-Zhou, ZHANG Ming-Yu, LI Xiao-Tian
    1994, 15(3):  418-422. 
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    In this paper, ab initio calculations are carried put by using the contracted Gaussian basis sets of double zeta type on the perhalogenated boranes BnCln0,2-(n= 4,6,8,9,10,12) and the corresponding boron hydrides BnHn0,2-.The stabilities of BnCln and BnCln2-were discussed.It was demonstrated that there are great differences of the relative stabilities between these two series.In addition, on the basis of the calculations and analysis of B4H42- structrue rule, it is concluded that B4H42- is unstable owing to the incomplete filling of its framework bonding molecular orbital.For the same reason,BnHn is not stable and has not been synthesized so far.
    The Electronic Spectrum and Nonlinear Third-Order Optical Properties of Zinc Phthalocyanine
    FENG Ji-Kang, LI Jun, LI Zhi-Ru, SUN Jia-Zhong
    1994, 15(3):  423-427. 
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    The electronic structure, UV-visible spectrum, nonlinear third-order optical susceptibility and its dispersion of zinc phthalocyanine(ZnPc)were studied by using INDO/SDCImethod.It was discoverd that the contribution of Zn(Ⅱ)to γ is very little in ZnPc, so the <γ> of ZnPc is almost equal to <γ> of H2Pc.It can be explained reasonable from our calculated results.
    Activity Phase of Solid Phosphoric Acid Catalysts
    WEN Ling-Sheng, LIU Ya-Juan, ZHANG Wu-Yang, XU Zheng, CUI Sheng-Fan, DING Yi, WANG Shi-Li
    1994, 15(3):  428-430. 
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    The relationship between the catalytic activity of mixed butenes oligomerization over solid phosphoric catalysts and polycondensate of phosphoric acid,the crystalline forms of silicium phosphate in the catalyst have been studied.It was suggested that high activity component of solid phosphoric acid catalyst should be a mixture of pyro and ortho-phosphoric acid and crystalline"C"form of silicium phosphate.
    Coalescence of C70 Cations and Anions by Laser Ablation
    LIU Zhao-Yang, WANG Chun-Ru, HUANG Rong-Bin, LIN Feng-Chen, ZHENG Lan-Sun
    1994, 15(3):  431-432. 
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    The C70 fullerence is found to be coalesenced when it was ablated by pulsed laser in high vaccum.The multiple number of coalescenced size of C70 was found to be up to 4,and each aggregate consists of a smooth distribution of C2n species that can be fitted by a lognormal curve, this shows that all coalescenced products have a similar structrue.
    ESR Spectra of Ferric Comlexes in Human Stomach Cancer Tissues
    ZHENG Ying-Guang, WANG Ping, YU Xiao-Lin, ZHAO Ji-Shen
    1994, 15(3):  433-435. 
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    The samples of human stomach cancer tissues and non-cancer stomach mucous membrane were prepared by rapid-freezing method in liquid nitrogen, ESRspectra of these samples were determined and analyzed by convolution difference method.The ESRspectral differences between stomach cancer tissue and non-cancer stomach mucous membrance are tentatively explained as due to the changes of the ferric complexes during cancerization.
    Studies on Phase Equilibria at Superatmospheric Pressures for Binary Systems of Chloroform,Ethanol and Benzene
    MA Zhong-Min, CHEN Geng-Hua, WANG Qi, YAN Xin-Huan, HAN Shi-Jun, YU Shu-Xian
    1994, 15(3):  436-438. 
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    The vapor liquid equilibrium data for chloroform-ethanol and chloroform-benzene binary systems are determined at pressures from 101.3 to 303.0 kPa with the dual circulating vapor liquid equilibrium apparatus at superatmospheric pressures.The data at normal pressure are correlated by the Wilson, NRTL, UNIQUAC equations,and those at superatmospheric pressures are predicted from the correlated energy parameters and compared with those from the experimental results.Good results are obtained.Abinary azeotrope is formed at the studied pressures for the chloroform-ethanol mixtures.Some chloride ions are generated in this mixture when the temperature is over 400 K.
    Studies on Hydrogenation of Vegetable Oil Catalyzed by Ni-Fe/SiO2(Ⅰ)──Preparation and Activity of Catalyst
    LIAO Shi-Jun, HU Zhen-Zhu, YI Hui-Yang, QIAN Zai-Hu, GUO Can-Xiong
    1994, 15(3):  439-441. 
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    A new type of catalyst, Ni-Fe/SiO2,in which Fe is used as the activity promoting agent, has been prepared by a new method.The effects of some factors such as preparation conditions, reducing temperatures and reacting conditions were investigated.It is shown that Ni-Fe/SiO2 catalyst has a good activity to the hydrogenation of vegetable oil, the addition of Fe is very important for improving the activity of the catalyst.
    The Crystallization Behavior of the Core of Micelle in Dilute Block Copolymer/Homopolymer Solutions
    LIU Li-Zhi, SHI Xiao-Hong, JIANG Bing-Zheng, LI Hong, ZHOU En-Le
    1994, 15(3):  442-445. 
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    The crystallization behavior of the core and shell of micelle in different type of dilute block copolymer/homopolymer solutions has been studied.The results show that the crystallization of the crystallizable block of crystalline-amorphous block copolymer is very different when the crystallizable block forms the core or the shell of the micelle.
    Electroredox Behaviour of Alkyl Viologen Compounds
    FENG Min-Hui, LI Wen, LIANG Zhao-Xi
    1994, 15(3):  446-449. 
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    Electroredox behaviour of alkyl viologens and polyviologens has been investigated by using differential pulse polarography.The alkyl groups of viologen compounds influence the reduction potentials and the film forming property of reduced products on the electrode.Compared with the low molecular alkyl viologen compounds, the first reduction potentials (E1) of alkyl polyviologens are rather positive, the potential differences(△E)of two-step reduction potentials are larger.The halogen anions of supporting electrolytes influence the reduction potentials of viologen compounds, the order is I->Br->Cl->F-.
    The Structure and Properties of Macroporous Crosslinked Polystyrene Adsorbents Modified with Polar Monomer
    LIU Yong-Ning, SHI Zhuo-Qing, SHI Rong-Fu, FAN Yun-Ge, HE Bing-Lin
    1994, 15(3):  450-453. 
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    This paper studied the modification of macroporous adsorbents by adding some polar monomer, such as methyl methacrylate, methyacrylate, methyacrylaic acid, acrylonitrile or allyl acetate, in the copolymerization of styrene and divinylbenzene.The structure of adsorbents modified was characterized by means of physical technology and chemical methods,and the adsorption properties for stevioside were determined.The results of experiments show that the polarities of these resins have an important influence on their physical structure and adsorptive capacity.
    Studies on Gaseous Phase Polymerization of Ethylene with Highly Active Catalyst(Ⅰ)──The Gaseous Phase Homo-and Copolymerization as well as Kinetics of Gaseous Phase Polymerization of Ethylene
    WANG Hai-Hua, LI Nai-Xin, LU Ze-Jian, LIN Shang-An
    1994, 15(3):  454-460. 
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    The gaseous phase homo-and copolymerization of ethylene has been studied in the presence of TiCl4/MgCl2/ZnCl2/SiCl4/alcohol/Al(i-Bu )3 highly active catalyst which was prepared by comilling-reaction procedure.It was found that the catalytic efficiency and bulk density of PEdecreased with increase in content of titanium compound.The added i-C3H7OHraises the catalytic performance and improves the morphology as well as particle distribution of the PEwith a optimum dosage of i-C3H7OH/MgCl2=1.0-1.5.The kinetics of gaseous phase ethylene polymerization has been investigated.The polymerization rate equation in good agreement with experimental evidence is expressed as:vt-vs=(v0-vs)e-βt.The morphologies of the catalyst before and after prepolymerization as well as PE and LLDPE were examined by SEM.The structures and properties of the PEwith LLDPE were studied by WAXD,DSC and 13C NMR.
    Dynamic Mechanical Properties of Epoxy Resins/Poly(Ethylene Oxide) Blends Cured with Phthalic Anhydride and Aromatic Amine
    ZHENG Si-Xun, LUO Xiao-Lie, MA De-Zhu, LIU Rui-Lin, LI Jian
    1994, 15(3):  461-465. 
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    Dynamic mechanical properties fo epoxy resins(EP)/poly(ethylene oxide) blends cured with phthalic anhydride(PA) and 4,4'-diaminodiphenylmethane(DDM)were studied.The experimental results indicated that all the blends, with various blend composition and content of curing agents, are miscible at amorphous state,i.e.all the dynamic mechanical spectra showed one single Tg, regularly between two Tgs of constituents.The mechanism of the low temperature relaxation(β relaxation)is different because there are different crosslinking networks of chemical structure between the aromatic amine-cured and the phthalic anhydride-cured products, Therefore, the reliance on the crosslinking density and blend composition is also different.
    Inhibiting Effect of Radical Polymerization of Vinyl Monomers(XⅧ)──Studies on Inhibiting Effect of ATSCPOs in Corporated with Common Inhibitors on MMA
    ZHANG Zi-Yi, WEI Xiu-Ying, WANG Tie-Jun
    1994, 15(3):  466-469. 
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    The inhibiting effect of 1-arylformyl-4[4'-(2,2,6,6-tetramethyl piperidine)-1-oxy thiosemicarbazide(ATSCPOs)incorporated with common inhibitor(CIH), such as hydroquinone(HQ),1,4-benzoquione(BQ),N,N'-bisethylhydroxylamino(DEHA)and phenothiazone(PT) on radical polymerization of methyl methacrylate under the initiation of AIBNhas been studied by dilatometric method.The results showed that when ATCPO/CIHequalized to 5: 1,inhibiting effect of these prescription became more prominent than ATSCPOs or CIHused as inhibitor alone, but ATSCPOs-BQ composition, For example, test indicated that the inductive period of polymerization(ti)was extended, the Rp after ti, were decreased and the Mw of polymethylmethacrylate has been turned into smallish.The appearance revealed that there is a synergistic action between ATSCPOs and CHI.On the basis of retardation coefficient(K) and inhibiting factor(F), relative inhibiting reactivities of several ATSCPOs were determined as in the following order: ATSCPOs-HQ>ATSCPOs-PT>ATSCPOs-DAHA≈ATSCPOs-BQ
    Preparation and Properties of a New Series of PTC Composites
    DU Wei-Fang, DU Hai-Qing
    1994, 15(3):  470-471. 
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    A new series of composites exhibiting a large positive temperature coefficient (PTC)of resistivity effect have been prepared by incorporating YBa2Cu3O7-x particles into polyethylene matrix.The PTCeffect of YBa2Cu3O7-x/polyethylene composites, which was caused by the volume effect of polyethylene, was maximum with 10 orders of magnitude at specimen with 30 vol% YBa2Cu3O7-x.The temperature at which resistivity increases rapidly depends on the melting point of polyethylene.