Loading...
CJCU

Table of Content

    24 October 1993, Volume 14 Issue 10
    Previous Issue    Next Issue
    Articles
    Synthesis and Characterization of Samarium Complex with β-Alanine
    MENG Qing-Bo, LIU Jian-Xue, WANG Zeng-Lin, ZHANG Shu-Gong, DING Qing, ZHAO Shu-Fu, NIU Chun-Ji, SUN Yong-Zeng
    1993, 14(10):  1333-1336. 
    Asbtract ( )   PDF (300KB) ( )  
    Related Articles | Metrics
    The single crystal of a samarium complex of β-alanine has been synthesized, and its composition, properties, characters of chemical bond as well as electronic structure have been investigated by elemental analysis, TG-DTA, IRspectrum and quantum chemical calculation.The ligand is coordinated to the samarium ion only via its carboxyl group.The coordination bonds between the ligand and samarium ion are poredominantly ionic, but have certain covalency.The contribution to covalent bonding is mainly due to the 5d orbitals os the samarium ion, while the 4f orbitals are strongly localized.
    Synthesis and Long-Range Magnetic Exchange Interaction μ-Terephthalato Binuclear Copper(Ⅱ) and Binuclear Manganese(Ⅱ) Complexes
    LIAO Dai-Zheng, SHI Juan, JIANG Zong-Hui, YAN Shi-Ping, WANG Geng-Lin
    1993, 14(10):  1337-1340. 
    Asbtract ( )   PDF (307KB) ( )  
    Related Articles | Metrics
    Four new binuclear complexes, [Cu2 (TPHA) (NO2-Phen)4] (ClO4)2 · H2O(1), [Cu2(TPHA)(Me-bpy)1](ClO4)2(2),[Mn2(TPHA)(NO2-Phen)1](ClO4)2·2H2O(3) and [Mn2(TPHA)(Me-bpy)4](ClO4)2(4), where TPHA, NO2-Phen and Me-bpy denote tereph-thalato dianion, 5-nitro-1, 10-phenanthroline and 4, 4'-dimethyl-2, 2'-bipyridine respectively, were synthesized and characterized by elementary analysis, IR, electronic spetra and variable temperature magnetic susceptibility.Variable temperature (4.2-300 K) magnetic susceptibility data for the complexes show that there exists the antiferromagnetic exchange interaction between the two metal ions with J(cm-1) values of -5.04(1),-6.52(2),-0.68(3) and -0.73(4).
    Preparation of Bimetal Pillared Clays with More Amount of Nickel
    HE He-Ming, SUN Tie, JIANG Da-Zhen, MIN En-Ze
    1993, 14(10):  1341-1344. 
    Asbtract ( )   PDF (292KB) ( )  
    Related Articles | Metrics
    Multi-metal pillared clay was prepared wih a new method—growth.The amountof nickel in the framework obtained from the said method was far more than that from the substitution.The layered spacing of the product was about 1.7 nm.The band of 744 cm-1 on IRspectrum of sample may be a criterion for proving the presence of the pillar.The nickel ion in the pillar existed in a hexadentate form.The structure of the pillar was similar to the spinel.The nickel ion in this state was reduced more difficultly than that in Johansson ion.
    Low Temperature NMR Study on the Reactions Between Pd2X2(dpm)2(X=Cl-, Br-, I-) and H2S
    WENG Wei-Zheng
    1993, 14(10):  1345-1348. 
    Asbtract ( )   PDF (319KB) ( )  
    Related Articles | Metrics
    Low temperature NMRtechnique was used to investigate the reactions of H2Sand Pd2X2 (dpm)2(X=Cl-, Br-, I- ; dpm=Ph2PCH2PPh2) in CD2Cl2.The detail NMRdata for the reaction intermediate are presented which show that the reactions form the corresponding bridged-sulfide complexes via oxidative-addition of H2Sacross the Pd-Pd bond of Pd2X2(dpm)2 to give a hydrido(mercapto)intermediate, which subsequently liberates H2 to give Pd2X2(dpm)2(μ-S) species.
    Preparation of Pillared Hydrotalcite with PCuMo11 Heteropolyanion
    HE He-Ming, SUN Tie, JIANG Da-Zhen
    1993, 14(10):  1349-1350. 
    Asbtract ( )   PDF (157KB) ( )  
    Related Articles | Metrics
    The transition-metal ion was introduced into the Keggin structure in terms of the degradation of heteropoly acid.The compound was intercalated into the layered region of the hy-drotalcitelike[Zn,Al(NO3-)] in the microwave field.It is the first time to prepare the hydrotal-cite pillared with PCuMo115- heteropolyanion.The product possesses a regular layered structure and a good crystallinity.The NO3- ion existing in the layered region was substituted completely by heteropolyanion.The heteropoly compound intercalated in the layered region of hydrotalcite still has a strong ESRsignal.The experiment results show that Cu with C4v symmetry distributes uniformly in the Keggin structure and exists in a cubic cone field with pentadentate.
    The Kinetic Studies of Across-Erythrocyte Membrane Transport of Platinium(Ⅱ) Complexes
    ZHANG Wan-Ming, LI Lian-Zhi, LI Rong-Chang, DOU Pei-Yan, WANG Kui
    1993, 14(10):  1351-1353. 
    Asbtract ( )   PDF (2336KB) ( )  
    Related Articles | Metrics
    In the synthetic plasma, the uptake kinetics of cis-platin and it' s related compounds in human erythrocytes was studied.The experimental results show that the across-membrane transport of all the platinum compounds studied follows a first-order kinetic process in the initial stage.The entry of these compounds into the human red blood cell is considered to follow a passive diffusion mechanism.The uptake rate constants of seven platinum(Ⅱ) compounds were determined.The uptake rates are related to the polarity, charge and hydrolysis rate of the coordination compounds.
    The Theory of Quasi-Steady-State Reversible Wave for Derivative and Semi-derivative Voltammetry at Ultramicro-disk Electrode
    ZHANG Zu-Xun
    1993, 14(10):  1354-1357. 
    Asbtract ( )   PDF (304KB) ( )  
    Related Articles | Metrics
    The theory of quasi-steady-state reversible wave for derivative and semi-derivative voltammetry is described.The behaviour of current-potential curves are discussed in detail.The equations of (这里有图片19931007-1354-1.gif) are as follows respectively.
    Studies on Fluorescent Characteristics and Analytical Application of Cerium(Ⅲ) in Potassium Chloride Medium
    HUANG Cheng-Zhi, CHI Xi-Zeng
    1993, 14(10):  1358-1362. 
    Asbtract ( )   PDF (265KB) ( )  
    Related Articles | Metrics
    Our research showed that the constant fluorescence of Ce3+ in the medium of KCl with pHlower than 6.2 could be used to determine trace cerium when it was excited at 252.4 nm.Our working acid range is pH 5-6 and the interference of Fe3+ was eliminated by addition of Al2(SO4)3.Over the range of 0- 3.0× 10-5 mol/L Ce3+, the equation of ΔF=2.37× 106C -0.001(n=10, r=0.9999) was abided and the determination limit was 6.0×10-9 mol/L.The recovery and relative standard deviation for GBW07103 rock reference material was 95.0%-103.2% and 4.18(n=10) respectively.The determination results of GBW07402 soil and GBW07311 stream sediment reference material were satisfactory.
    The Study on a PVC Membrane Electrode for Sulbeaicillin
    SUN Li-Xian, LI You-Cheng, YU Ru-Qin
    1993, 14(10):  1363-1365. 
    Asbtract ( )   PDF (253KB) ( )  
    Related Articles | Metrics
    In this paper, a PVCmembrane electrode is prepared for sulbenicillin, 3,3-dimethyl-7-oxo-6-(2-phenyl-2-sulfoacetamido)-4-thia-1-azabicyclo [3, 2, 0] heptane-2-carboxylic acid, based on its ion pair complexes with hexadecyltrioctylammonium iodide (HTOA).Membrane composition of the electrode was optimized by using the sequential level elimination method for orthogonal experimental design.The electrode has a Nernst response range from 6.03×10-6-1.0× 10-1 mol/Lwith an average slope of 28.0 mV/pC.The limit of detection is 1.66×10-6.The electrode responses were not affected by pHin the range 6.3-7.0.The electrode was used for determining sulbenicillin in raw material of drug preparation with satisfactory results.
    A Fiber Optic Biosensor for the Determination of Cholesterol
    ZHANG Zhu-Jun, MA Wang-Bai
    1993, 14(10):  1366-1369. 
    Asbtract ( )   PDF (311KB) ( )  
    Related Articles | Metrics
    A Fiber optic biosensor responding to both of cholesterol esters and free cholesterol is prepared by covalently coupling cholesterol esterase, cholesterol oxidase and horseradish peroxi-dase to bovine serum albumin via glutaraldehyde and making a membrane to end of fiber-optic handle.This sensor is based on cholesterol esterase and catalyzes the hydrolysis of cholesterol esters to free cholesterol, then the cholesterol oxidase in the prescence of oxygen oxidizes the free cholesterol to 4-cholestene-3-one and hydrogen peroxide, which reacts with luminol under the catalysis of horseradish peroxidase to produce chemiluminescence.The linear range for cholesterol is 0.5-20 μg/mL.The detection limit is 0.1 μg/mL.The response time is 2 min.The life time of membrane is longer than 2 months.This biosensor has been applied to determining the total cholesterol and free cholesterol in serum with specificity.
    Investigation on the Interaction Mechanism of Bilirubin and Biliverdin with Metal Ions
    ZENG Bai-Zhao, LIU Zhuang, ZHANG Wu-Ming, ZHOU Xing-Yao
    1993, 14(10):  1370-1373. 
    Asbtract ( )   PDF (316KB) ( )  
    Related Articles | Metrics
    The interaction mechanisms of bilirubin/biliverdin with some metal ions in basic aqueous solution were investigated with spectral and electrochemical methods.It was found that the interaction between bilirubin/biliverdin and metal ions was affected by various factors such as reaction medium, etc.In the presence of oxygen, bilirubin/biliverdin can be directly (or catalytical-ly) oxidized by some metal ions, however, when oxygen was absent, they were not oxidized by some metal ions but complexed with them.In this paper, the composition, structure and stability of these complexes were researched, and the catalytic reaction mechanism concerned was discussed.
    Voltammetric Determination of 5-Hydroxyindol-acetic Acid, Uric Acid and Homovanillic Acid in Animal Brain with Carbon Fiber Electrodes
    PENG Tu-Zhi, WANG Guo-Shun, LI Hui-Ping, LIU Guo-Qing, CAO Yu-Ping
    1993, 14(10):  1374-1376. 
    Asbtract ( )   PDF (238KB) ( )  
    Related Articles | Metrics
    An simple electrochemical pretreatment has been used to active carbon fiber electrodes for in vivo determination.In rat brain, there were four well-defined semi-differential voltammet-ric peaks.The peak at 0.36 Vwas combined by oxidative current of 5-HIAAand UA, 5-HIAAwas about 80% and UAabout 20%.The oxidation of HVAformed the peak at 0.54 V.The concentrations in brain extracellular fluid were determined, 5-HIAA, 3×10-6 mol/L; UA, 9×10-5 mol/Land HVA 8×10-6 mol/L.
    Direct Electrochemistry of Cytochrome C at Gold Electrodes Modified with Monosaccharides
    QIAO Zhuan-Hong, GU Ren-Ao, QU Xiao-Gang, LU Tian-Hong, DONG Shao-Jun
    1993, 14(10):  1377-1379. 
    Asbtract ( )   PDF (258KB) ( )  
    Related Articles | Metrics
    The direct electrochemistry of cytoclirome Cat gold electrodes modified with different monosaccharides was investigated.It was found that all the five monosaccharides studied are effective promoters for the direct electrochemistry of cytoclirome C.However, the promotion effect strongly depends on the dipping time and concentration of monosaccharides in the modification procedure of the gold electrode and the performance of the monosaccharide-modified gold electrodes is not stable because of the weak adsorption of the monosaccharide molecules on the gold surface.These results indicate that the coverage of promoter molecules on the surface of the gold electrode is an important factor to affect the promotion effect of promoters.
    Friedel-Crafts Acylation Reactions Catalyzed by Trifluoroacetic Anhydride-Synthesis of 4-Ethyl-2,5-dimethoxyphenyl Alkyl Ketones
    PENG Hong, ZHAO Cheng-Xue, GONG Yue-Fa
    1993, 14(10):  1380-1382. 
    Asbtract ( )   PDF (239KB) ( )  
    Related Articles | Metrics
    The title compounds were synthesized through the acylation of 2-ethyl-1, 4-dimethoxybenzene 1 by eight different aliphatic carboxylic acids using trifluoroacetic anhydride as the catalyst.The eight new ketonevs were characterized by IR,NMR,UVand MSspectrometry.
    Syntheses of (3-Benzyl-4-aroyl-l,2?-triazole-5-yl) (5-phenyI-l, 3,4-oxadiazole-2-yl) Sul fides
    FENG Xiao-Ming, CHEN Rong, ZHANG Zi-Yi
    1993, 14(10):  1383-1386. 
    Asbtract ( )   PDF (2347KB) ( )  
    Related Articles | Metrics
    Thirteen new (3-benzyl-4-aroyl-1, 2, 4-triazole-5-yl) (5-phenyl-1, 3, 4-oxadiazole-2-yl) sulfides (2) have been synthesized from the nucleophilic displacement of 3-benzyl-4-aroyl-1, 2,4-triazole-5-hydrosulfuryl anion on the 2-position of 2-methylsulfonyl-5-phenyl-1,3, 4-oxadia-zole.The structures of all compounds 2 were confirmed by elemental analysis, IR, 1H NMRand MS.Compounds 2 were screened for their antifungal activity against E.Coli at 0.01%.The results show that some compounds 2 have stronger inhibiting effects.
    Study on the Synthesis and Herbicidal Activity of 3-Phenyl-4-chIoro-l,3?-diazaphospholidin-2-thione
    FENG Ke-Sheng, CHEN Ru-Yu, CHENG Mu-Ru, XIAO Hong-Bo, LI Dong-Bo
    1993, 14(10):  1387-1390. 
    Asbtract ( )   PDF (2401KB) ( )  
    Related Articles | Metrics
    Phenylthiourea was reacted with trichlorophosphine and aldehydes (ketones) to produce 3-phenyl-4-chloro-1, 3, 4-diazaphospholidin-2-thione-4-oxides (Ⅰ) a.s well as the corresponding 4-sulfides(Ⅱ) in anhydrous benzene.Compounds Ⅰ were easily transformed into compounds Ⅱ.by Lawesson reagent.Compounds Ⅰ were distinguished from compounds Ivery clearly by 31P NMR, MSand IRspectra.The X-ray analysis of compound Ⅱc indicated that the five-membered heterocycle had coplanar structure.The biological tests found that compounds Ⅱ have good selective herbicidal activities.
    Studies on Chemical Constituents of Lobelia Cardinalis L.
    LI Yu, SHI Yan-Ping, O.E.Edwards
    1993, 14(10):  1391-1393. 
    Asbtract ( )   PDF (254KB) ( )  
    Related Articles | Metrics
    Eight compounds were isolated from the whole dried part of Lobelia Cardinal is L.and their structures were identified by chemical methods and spectroscopic methods.Two of them are new: urs-3β, 21β-dihydroxy-12-en-28-oic acid (1), urs-21β-hydroxy-3-oxo-12-en-28-oic acid (2); the others are known compounds: olean-3β,24-dihydroxy-12-en-28-oic acid(3).ursic acid (4).oleanic acid(5).olean-12-en-28-oic acid(6),β-stitosterol(7) and β-daucosterol(8).
    Synthesis and Crystal Structure of O-Galactopyranosyl N,N-Bis(2-chloroethyl)phosphordiamidate
    CHEN Ru-Yu, CHEN Xiao-Ru, WANG Ru-Ji, WANG Hong-Gen
    1993, 14(10):  1394-1398. 
    Asbtract ( )   PDF (340KB) ( )  
    Related Articles | Metrics
    To study the antitumor activity of galactopyranosyl phosphoramidate, the title compound was synthesized by phosphorus oxychloride as phosphorylating agent.Apure isomer of the title compound was obtained by recrystallization from a mixture of chloroform and n-hexane, and its single crystal was cultured.The molecular structure of the title compound was determined by X-ray diffraction method.The crystal is monoclinic with space group P21, a=1.3474(5) nm, 6=1.0624(4) nm, c=1.6916(5) nm, β=110.55(3)°, V=2.2674 nm3, Mr=463.29, Z=4, Dx=1.35 g/cm3, μ=3.9 cm-1, F(000)=972.Atotal of 4379 independent reflections were collected, in which 2159 were observed.The final R=0.079 and Rw=0.088.The results of structure analysis indicate that the configuration of the chiral phosphorus atom of the title compound is assigned as R-form.
    Syntheses and Antitumor Activities of New Spin-labeled 5-Fluorouracil Derivatives
    WANG Yan-Guang, TIAN Xuan, LI Jing-Xin, CHEN Yao-Zu
    1993, 14(10):  1399-1401. 
    Asbtract ( )   PDF (247KB) ( )  
    Related Articles | Metrics
    Aseries of new spin-labeled 5-fluorouracil derivatives, as potential antitumor agents, were synthesized, and their structures were confirmed by IR, UV, MSand ESRspectra as well as elemental analysis.The antitumor activities of these compounds were tested against EACin mice.The preliminary results showed that some of the compounds exhibit certain antitumor activity.
    Synthesis of S-Propyl O-Phenyl N-AlkyI Thiolophosphoranlides
    YANG Xiao-Ping, LIU Zhao-Jie
    1993, 14(10):  1402-1404. 
    Asbtract ( )   PDF (234KB) ( )  
    Related Articles | Metrics
    Nine new S-propyl 0-phenyl N-alkyl thiolophosphoramides were synthesized by direct aminolysis of S-propyl O-phenyl thiolophosphorochlorate, which were prepared by reaction of S-propyl thiolophosphorodichlorate with phenol, without separation.The first attempt using inorganic baseCsodium hydroxide) as acid-acceptor, benzene-water as double solvent to synthesize the target products was successful.But the method can not obtain the aminolysis products by secondary amines.The reason was discussed.
    The Correlation Between the Extraction Rate Constants of Divalent Metal Ions by HEHEHP and the HSAB Rule
    SUN Si-Xiu, GAO Zi-Li, SHEN Jing-Lan, YANG Tian-Lin
    1993, 14(10):  1405-1409. 
    Asbtract ( )   PDF (325KB) ( )  
    Related Articles | Metrics
    The kinetics and mechanism of extraction of Mg(Ⅱ), Ca(Ⅱ), Zn(Ⅱ), Ni(Ⅱ), Cu (Ⅱ) and Pb(Ⅱ) from nitrate medium with 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (HEHEHP) in octane by means of the single drop method were studied at 298 K.The reaction rate constants (kf), the activation energies (Ea) and the activation entropies (ΔS≠) were calculated.The experimental results indicate that the extraction process may be controlled by the following interfacial reactions: M2+ +HA(i)=MA(i)+H+(fast)MA(i)+ 2H2A2(O)=MA2 · 2HA(O)+HA(i)+H+(slow) and their kf and Ea vary regularly with the change of hardness of Lewis acid.
    An XPS Study on Tetra-(p-nitrophenyl) Porphyrin Transition Metal Complexes
    SHI Tong-Shun, WEI Quan, CAO Xi-Zhang
    1993, 14(10):  1410-1413. 
    Asbtract ( )   PDF (212KB) ( )  
    Related Articles | Metrics
    The tetra-(p-nitrophenyl) porphyrin and its Mn(Ⅲ), Co(Ⅱ), Ni(Ⅱ) and Cu(Ⅱ) complexes and six manganese porphyrin complexes were investigated by XPS.π→π transition energy and shift of binding energies of N1s and Mn2p3/2 show that these metallic compounds are porphyrin metal complexes formed by the mosaic of metal atom into the π-electron system of the macrocycle structure of the prophyrins.The experimental results show that the binding energies of Mn2p3/2 of different kinds of manganese porphyrin complexes descend as the electronegativity of substituents on porphyrin ring decreases.The XPSdata of different manganese porphyrin complexes may be used to infer the structures of the substituents of the complexes.
    The Surface Enhance Raman Effect of Tetrakis (Sodium SulfonatePhenyl) Porphyrin (TPPS4)
    FU Hong-Gang, WANG Yu-Tian, LIANG Yin-Qiu
    1993, 14(10):  1414-1418. 
    Asbtract ( )   PDF (369KB) ( )  
    Related Articles | Metrics
    In this paper, we observe the Surface Enhance Raman Scattering of TPPS4 adsorbed on Ag electrode by activation at potential 1.2 Vwhich is close to the reduction potential of TPPS.The spectral peaks were assigned and a normal coordinate analysis was performed for modes in plane by using SGVFFfield.The results show that the vibrational modes which are relative to Natom were enhanced much areatly.In contrast to these results we explain the mechanism of TPPS4 enhanced effect.
    A Electrochemical Study on the Hydrogen Storage Electrode(Ⅱ)—Impedance Study of the Hydrogen Storage Electrode
    CAI Chen-Xin, ZHAO Dong-Jiang, WANG Bao-Chen
    1993, 14(10):  1419-1422. 
    Asbtract ( )   PDF (412KB) ( )  
    Related Articles | Metrics
    In this paper, the hydrogen storage electrode was studied by A.C.impedance method.The A.C.impedance experiment indicated that MH(Metal Hydride) electrode process is a multi-step process consisting of charge transfer and hydrogen atom adsorption process.The A.C.impedance diagram shows two semi-circles.The high frequency one corresponds to the charge transfer process and the low frequency one corresponds to the hydrogen atom adsorption process.The low frequency semi-circle is affected by MHelectrode charge-discharge cycles number and charge-discharge state.With the increasing charge-discharge number and the depth of discharge state, the low frequency semi-circle becomes smaller.To explain the A.C.impedance diagram, an equivalent circuit of hydrogen stroage electrode was suggested.
    Quantum Chemical Studies on Electronic Structure, UV and Circular Dichroism Spectra for Qinghaosu
    WANG Zhi-Xiang, CHEN Rong-Feng, LIN Su-Feng, CHANG Jun-Biao, GUO Rui-Yun, YOU Tian-Pa, HUANG Ming-Bao
    1993, 14(10):  1423-1426. 
    Asbtract ( )   PDF (409KB) ( )  
    Related Articles | Metrics
    Aquantum-chemical study of the Qinghaosu molecule has been carried out by performing INDO/S-CIcalculations.The electronic structure of the ground state is described, and the calculated UVand CD (circular dichroism) spectrum data are discussed in comparison with experimental results.
    Studies on the Phase Transfer Extraction of Penicillin G by Reverse Micelles
    WU Zi-Sheng, JIA Ying-Ping, CHU Ying, WANG Yu-Jie, LIU PeiYan, MA Zhan-Fang
    1993, 14(10):  1427-1431. 
    Asbtract ( )   PDF (438KB) ( )  
    Related Articles | Metrics
    This paper reports the extraction properties and mechanisms of a non-protein active matter penicillin Gby reverse micelles using the phase transfer technique for the first time.It is shown that the mechanisms of the phase transfer extraction of penicillin Gusing CTAB/n-octanol : chloroform(4 : 1) reverse micellar system are ion-pairing electrostatic interactions and micellar solubilisation.It is also shown that the extraction is above 90% in the pHrange from 5 to 8 in which penicillin Gis stable at room temperature.
    Studies on Thermodynamics of Stoichiometric Displacement Model for Adsorption of Solute from Liquid-Solid System
    CHEN Yu-Yin, GENG Xin-Du
    1993, 14(10):  1432-1436. 
    Asbtract ( )   PDF (402KB) ( )  
    Related Articles | Metrics
    Free energy change of stoichiometric displacement process for adsorption(SDM-A) of solute in a liquid-solid system was investigated.An expression which elucidates the contributions of each solute, solvent and adsorbent in the system to Gibbs free energy change was derived and the physical meaning of each parameter of the expression was also explained.Gibbs free energy change of adsorption for solute determined with traditional method can be divided into two independent fractions relating to the adsorption of solute and to the desorption of solvent, respectively.Alinear relationship between two linear parameters βa and q/Zof the SDM-Aand the reciprocal of absolute temperature was derived.And, each of the changes in both enthalpy and entropy of the SDM-Aof solute can also be separately divided into two independent fractions.The derived equations were tested with experimental data in literatures and a conformable result between the both was obtained.
    Preparation of LaFeO3 Nanocrystalline Thin Film and Application in the MOSFET Gas Sensor
    ZHAO Shan-Qi, ZHAO Chun, CAI Hong, XU Bao-Kun, PENG Zuo-Yan, ZHAO Mu-Yu
    1993, 14(10):  1437-1438. 
    Asbtract ( )   PDF (173KB) ( )  
    Related Articles | Metrics
    The precursors of LaFeO3 were prepared by sol-gel method and nanocrystalline film of the LaFeO3 were obtained by a solid phase reaction at about 550℃ for 1 hour.The thicknesses of the nanocrystalline films are uniformly distributed, and their crystal sizes are 40-50 nm.Combining this thin film technology with planar technique of integrated circuit, we have developed NCF-OSFETgas sensor for the first time.This device not only has good sensitivity to ethanol, but also has excellent selectivity.
    Oscillating Chemistry of NaBrO3-CH2(COOH)2-H3PO4-CuL2+System
    XIE Fu-Xin, XU Zhi-Qiang, JIA Xiao-Ying, NI Shi-Sheng
    1993, 14(10):  1439-1441. 
    Asbtract ( )   PDF (254KB) ( )  
    Related Articles | Metrics
    We investigated the oscillating chemical reaction of NaBrO3-CH2 (COOH)2-CuL2+-H3PO4 system, where [CuL2+] is [Cu(Me6[l4]-4,11-dieneN4](ClO4)2 · 3H2O.The domain of the existance of the oscillation was obtained in the coordinates of NaBrO3 and CH2(COOH)2. The effects of initial concentration of the components on the oscillation were studied.Various re-ductants (HOOCCOOH, Vcetc) can influence the oscillations.So HBrO2 is an important intermediate.When Ag+, Hg2+(4× 10-5 mol/L) were added to the oscillating system, the oscillations were quenched immediately.It seems that Br- plays the role of a control intermediate as in B-Zsystem catalyzed by Ce4+ or Mn2+, In this system, the oscillations were also inhibited by acrylamide, H2O2 etc.This shows that the free radical may be involved in the reaction process.
    A Theoretical Study on Self-doping Conducting Mechanism of Substituted Polypyrrole
    FU Yu-Jie, WANG Rong-Shun, SU Zhong-Min
    1993, 14(10):  1442-1444. 
    Asbtract ( )   PDF (241KB) ( )  
    Related Articles | Metrics
    The geometries of the three structures of poly-(3-methylpyrrole-4-carboxylic acid) (PMPC), reduced PMPC(a), oxidized PMPC(c) and half-oxidized PMPC(b), have been optimized by means of MNDOprogram.The electronic and energy band structures of these systems have been studied by means of EHMO-COmethod.The self-doping conducting mechanism was explored in terms of the calculated results.After β-Hatom of PPy is substituted by methyl and carboxy group, Eg of system become smaller and conductivity increases because π-orbital of pyrrole and p-orbital of carboxy group form LUCOand NLUCOwhich corresponds to two impurity bands between valence band and conductive band.Reduced PMPCcan spontaneously dope to form stable oxidized PMPCby the lass of proton of carboxy group, which makes HOBWincreasing and Eg decreasing furtherly.The groups with the atoms of bigger electroaffinity play an important role in the self-doping conducting process.
    A Study on Catalytic Behavior of NiSO4/γ-Al2O3 for Ethene Dimerization
    CAO Dian-Xue, CAI Tian-Xi
    1993, 14(10):  1445-1447. 
    Asbtract ( )   PDF (230KB) ( )  
    Related Articles | Metrics
    Ethene dimerization over NiSO4/γ-Al2O3 was studied.It is found that the activity of the catalyst for ethene dimerization is very high and its maximum value appeared at the loading of 5 wt% -10 wt% of Ni and calcination temperature of 773-873 K.The effects of support and sulfate anion on the activity was attributed to their influences on the catalyst acidity, which is one of the greatest factors affecting the dimerization.Since all of the catalysts derived from various sulfates except nickel sulfate are of no activity, though they are all strongly acidic, it was suggested that nickel component play a role as an active center.
    The Condensation of Acetone over Solid Base Catalyst
    WANG Yu-Huan, WANG Guo-Jia, XIAO Jun-Hua, MA Jun
    1993, 14(10):  1448-1450. 
    Asbtract ( )   PDF (168KB) ( )  
    Related Articles | Metrics
    The acetone underwent the condensation to produce mainly isophorone and mesityl oxide over a kind of solid base catalyst.The catalyst shows a better activity.The calcination temperature of the catalyst precursor Ca(OH)2 influences obviously the activity of condensation of acetone.The results of basicity measurement show that there is a very good relationship between the conversion of acetone and surface basicity of the catalyst.
    Studies on the Rh-Ti/SiO2 Catalysts Prepared by Vapor Deposition Method
    HU Yun-Hang, WAN Hui-Lin
    1993, 14(10):  1451-1452. 
    Asbtract ( )   PDF (173KB) ( )  
    Related Articles | Metrics
    Aseries of Rh-Ti/SiO2 catalysts were prepared by vapor deposition method.The catalysts were characterized by XPS, TPDand their activities of COhydrogenation were tested in a microreactor system.The results show that the Ti content of the catalysts has approximately linear relations with the deposition time of TiCl4.Although Ti covers some of the active sites on the catalysts surface, it enhances the activity of each active site and the total activities.
    Effect of the Third Component on the Catalytic Properties of Cu-Co Catalysts for Alcohols Synthesis
    LI Jing, WANG Jing-Chun, WU Yue
    1993, 14(10):  1453-1455. 
    Asbtract ( )   PDF (239KB) ( )  
    Related Articles | Metrics
    In this paper, the effect of the third component on the catalytic properties of Cu-Co catalysts for the selective synthesis of alcohols from COand H2 was studied.The results show that the third component can influence the reduction property of Co which would influence the activity and selectivity of alcohol synthesis.
    Mechanism of Alkali-thickening and Behaviour of Flow of opolymer Containing Acrylic Acid Emulsions
    LIU Zheng-Ping, LIU Feng-Qi, LI Zhi-Ying, TANG Xin-Yi
    1993, 14(10):  1456-1459. 
    Asbtract ( )   PDF (321KB) ( )  
    Related Articles | Metrics
    In this paper, a series of styrene, butyl acrylate and acrylic acid copolymer latexes were synthesized by semi-batch emulsion copolymerization.Aqueous ammonia titration curves and rheologicl properties of latexes were discussed.It was found that effect of aqueous ammonia on alkali-thickening of latexes containing carboxyl group increases with the increasing of contents of carboxyl group and of soft segmer in copolymer, and that with the increasing of amounts of aqueous ammonia, pHs and viscosity of latexes mostly have two sharp changes, and that latexes have various rheological properties because of different copolymer components and pHs.
    Cationic Polymerization of IBVE Initiated by Cl2 TiCl4/Toluene (Ⅰ)—Initiating Centers and the Role of Their Complex Competition in the Polymerization
    GUO Wen-Li, XU Rui-Qing, WU Guan-Ying
    1993, 14(10):  1460-1463. 
    Asbtract ( )   PDF (328KB) ( )  
    Related Articles | Metrics
    There coexist at least two initiating centers.The monomodal trace of the polymer in GPCwas observed when only one active center outlives after complexing competition.In the given system IBVE/Cl2/TiCl4/toluene the complexing competition is between Cl2/TiCl4 and H2O/ TiCl4 where in the trace of water existed as residual impurity being not thoroughly removed by usual purification technique.The unstable equilibrium constants for complexation reaction of Cl2/TiCl4 and H2O/TiCl4 were determined for them as 1.9×10-10 and 8.31×10-6 respectively.The huge difference between their unstable equilibrium constants shows active complex Cl2/TiCl4 is predominate, then “living” characterastic of the polymerization is outstanding.
    Investigation of Nucleating Agents on Low Ethyl ene Content Polypropylene Copolymer Crystallization
    ZHANG Rui-Yun, LUO Xiao-Lie, ZHENG Hai-Feng, MA De-Zhu
    1993, 14(10):  1464-1468. 
    Asbtract ( )   PDF (1102KB) ( )  
    Related Articles | Metrics
    With the Differential Scanning Calormeter (DSC) and Polarized Light Microscope (PLM), the effect of a series of nucleating agents on the low ethylene content polypropylene copolymers and polypropylene (PP)/polyethylene (PE) blends have been studied.It is shown that the nucleating agent which is effective to the crystallization of PPhomopolymer is also useful to the crystallization of PPcopolymers.In general, the efficiency of nucleating agent in PPcopolymer is higher than PPhomopolymer, which can be well explained by the difference of regularity of molecular chain between PPcopolymer and PPhomopolymer.In PP/PEblends, the nucleating agents affect the nucleation of both PPand PEcrystallization.
    The Crystallization of the Random Polystyrene in Dilute Solution by Quick Cooling
    XUE Qi, LU Yun, SHI Gao-Quan, MA Wan-Li, ZHANG Fu-Sheng, ZHAO Xiao-Ning, HONG Jian-Ming
    1993, 14(10):  1469-1470. 
    Asbtract ( )   PDF (2357KB) ( )  
    Related Articles | Metrics
    Polystyrene polycrystals have been obtained by quick cooling treatment of the dilute solution of random polystyrene in cyclohexane using liquid nitrogen.The results of transmission electron microscope and X-ray diffraction have shown that the polystyrene polycrystals belong to hexaplanar and its amount is about 20% of the total.
    Synthesis of Chiral Diphosphine Ligand of (4S,5S)-(—)-DIOP
    XU Guo-Chun, SUN Jun-Tan, HE Bing-Lin
    1993, 14(10):  1471-1472. 
    Asbtract ( )   PDF (2194KB) ( )  
    Related Articles | Metrics
    An modified method for the synthesis of DIOP(4S.5S)-(—)-2.3-O-isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane from natural tartaric acid is reported.
    Measurement of Relative Reactivity Ratios of Styrene and BMA by FTIR
    LU Zhi-Bao, CHEN Jing, HAN Zhe-Wen, WU Ping-Ping
    1993, 14(10):  1473-1475. 
    Asbtract ( )   PDF (261KB) ( )  
    Related Articles | Metrics
    For the system of styrene/n-butyl methacrylate/AIBN, copolymerizations were carried out at 40℃, 60℃, 80℃, 100℃, 120℃, 140℃ respectively.The compositions of copoly-mers were analyzed by FTIR.The relative reactivity ratios of St and BMAare calculated by the error-in variables method, and 95% joint confidence intervals of the reactivity ratios are also given.The relative reactivity ratios of St-BMAsystem at different temperatures were obtained from the linear relation of relative reactivity rarios and temperatures by regression treatment.
    Carbocationic Polymerization of Isobutylene by the Initiator System of Diethyl Aluminium Chloride/Benzyl Chloride/Pyridine
    CAO Xian-Yi, ZHANG Chuan-Bai, WU Guan-Ying
    1993, 14(10):  1476-1478. 
    Asbtract ( )   PDF (227KB) ( )  
    Related Articles | Metrics
    Carbocationic polymerization of isobutylene was initiated by the system of diethyl aluminium chloride/benzyl chloride/pyridine.It was found that in the presence of electron donor (pyridine), the initiator efficiency increased and the molecular wieght distribution of the polymers narrowed.The linear relationship between the molecular weight and amount of poly-isobutylene which was prepared by the increment monomer addition experiment, and its amount showed that the polymerization got some living features.
    Synthesis and Phase Behavior of Side Chain Liquid Crystalline Polymer with Substituted Biphenyl Group
    HUANG Zhi-Hua, YANG Chun-Cai, TANG Xin-Yi, ZHOU En-Le
    1993, 14(10):  1479-1481. 
    Asbtract ( )   PDF (483KB) ( )  
    Related Articles | Metrics
    Liquid crystalline polymer with substituted biphenyl group in the side chain has been prepared by radical polymerization.The structures of monomer and polymer were confirmed by analyses of FTIRand 1H NMR.Its phase transformation was investigated by polarized optical microscope and DSC.The results showed that the monomer and polymer could form a LCphase in certain temperature range, the LCphase of monomer was confirmed to be smectic phase by WAXS, and that of polymer was nematic phase.
Special Issues
More...
Download
More...
Links
More...