Loading...
CJCU

Table of Content

    24 April 1995, Volume 16 Issue 4
    Previous Issue    Next Issue
    Articles
    The Influence of Medium on the Stability of Coordination Compounds(Ⅵ)──The System of Fe (CTS)--NaClO4-C2H5OH-H2O
    LIU Kui-Dao, HE Cheng-Feng, LIU Qi-Tao
    1995, 16(4):  495-499. 
    Asbtract ( )   PDF (345KB) ( )  
    Related Articles | Metrics
    The stability of compfex anion Fe(CTS)--composed of cation Fe3+and anion (CTS)4-in mixed solvents of ethanol-water with weight percentage of ethanol 0, 10, 20,30,40 and 50 was measured spectrophotometrically at 293 ± 1 Kby using NaClO4 as the supporting electrolyte with ionic strength ranging from 0.1～3. 0 mol/L. The thermodynamic stability constants of Fe(CTS)-in various mixed solvents have been obtained by a polynomial approximation equation based on Pitzer's theory. As a comparison, the traditional De bye-Hckel equation was used to treat the same data. The results show that this polynomial approximate method is obviously superior to the Debye-Hckel equation. It was discovered that there is a linear relation between the thermodynamic stability constants of Fe(CTS)-and the mole fraction of organic component in mixed solvents or the reciprocal of dielectric constants of the solvents. The medium effect and the standard free energy of transfer for the coordination reaction:Fe3++(CTS)4-=Fe(CTS)-is also discussed.
    Crystal Structure and Spectra of Eu(β-NMA)3(PHEN)
    LI Lin-Shu, WANG Rui-Fen, JIN Lin-Pei, CAI Guan-Liang
    1995, 16(4):  500-504. 
    Asbtract ( )   PDF (380KB) ( )  
    Related Articles | Metrics
    The title compound belongs to triclinic system with a space group 1,a=1. 1718 (2)nm,b=1.5670(3)nm,c=1.0002(2)nm;α=99.97(1)°,β=90.13(1)°,γ=98.36(2)°,M=845. 68,V= 1.7889(5)nm3,Z=2,F(000)=848,Dx=1.57g·cm-3,λ(Mo Kα)=0.071069 nm,μ=18. 06 cm-1,T=295K. The structure was solved by heavy-atom method and refined by full-matrix least squares technique for 54 non-hydrogen atoms and anisotropically for 4961 reflections with I>3σ(I). The final Ris 0.040.Center Eu(Ⅲ)ion is octa-coordinated wiht six oxygen atom of three β-NMA molecules and two nitrogen atoms of PHEN, giving the square antiprism with C1 site symmetry for the Eu(Ⅲ)ion.
    Studies on Hydrothermal Synthesis and Propertiesof Na1+xAlxZr2-x(PO4)3
    XU Yue-Hua, FENG Shou-Hua, PANG Wen-Qin
    1995, 16(4):  505-509. 
    Asbtract ( )   PDF (350KB) ( )  
    Related Articles | Metrics
    Aseries compounds of Na1+x AlxZr2-x(PO4)3 which have three-dimensional net work structure of NASICON have been prepared by using hydrothermal techniques. The synthesis conditions of these compounds, the crystallizing time, temperature and the amount of the reactants, which could effect on the products, have been detected.Apure crystal phase could be obtained when 0≤x≤0.33 by using hydrothermal techniques. The relation ship of the structures and properties with the amount of Al of the compounds has been studied. The compounds prepared by this method have very good thermal stabilities. The cells of the compounds decrease when the amount of Al in the compounds increases.Ionic conductivity and conducting activation energy of samples have been determined by means of ACimpedance technique. The conductivity of the compounds increases with the increasing of the amount of Al in the compounds when 0≤x≤0.33. These results show that the compounds with NASICONstructure can be directly obtained by hydrothermal syntheses.
    A New Langmuir-Blodgett Film Forming Azo Compound with High Second-Order Molecular Hyperpolarizability
    GAO Li-Hua, HUANG Chun-Hui, LIHui, WANG Ke-Zhi, LI Tian-Kai, XU Jing-Mei, ZHAO Xin-Sheng, XIA Xiao-Hua
    1995, 16(4):  510-511. 
    Asbtract ( )   PDF (152KB) ( )  
    Related Articles | Metrics
    Anew azo compound,(E)-N-methyl-4-{2[4-(dihexadecylamino) phenyl]azo}azopyridinium iodide, was prepared, its molecular structure is shown as follows: The monolayer formed by spreading its chloroform solution on a pure water substrate (18℃, pH5.4) can be transferred onto hydrophilic quartz substrate with transfer ratio very close to unity. From second-harmonic generation experiment, the second-order molecular hyperpolarizability was evaluated to be 4.7× 10-27esu.
    Synthesis and Characterization of Zn2Al-PW12-nVnO40(3+n)(n=1～4 )
    GUO Jun, SUN Tie, SNEN Jian-Ping, JIANG Da-Zhen, MIN En-Ze
    1995, 16(4):  512-514. 
    Asbtract ( )   PDF (213KB) ( )  
    Related Articles | Metrics
    Layered double hydroxides pillared with heteropolyanions,PW12-nVnO40(3+n)-(n=1-4),were synthesized by the direct anion exchange reaction in aqueous solution and characterized by elementary analysis,IR, XRD and DTA.
    Synthesis and Redox Properties of Copper Complexes of TAAB and Conductivity of Cu(I)(TAAB)(TCNE)
    LI Ming-Xing, XU Zheng, YOU Xiao-Zeng
    1995, 16(4):  515-517. 
    Asbtract ( )   PDF (245KB) ( )  
    Related Articles | Metrics
    The diacid salt,(H2TAAB)(BF4)2 was synthesized from o-aminobenzaldehyde or self-condensation products of o-aminobenzaldehyde. Reaction of(H2TAAB)(BF4)2with CuCl forms the complex Cu(Ⅰ)(TAAB)(BF4). Metathesis between lithium tetracyanoethylene with Cu(TAAB)(BF4)2 yields the complex Cu(Ⅰ)(TAAB)(TCNE). It is a poor conductor with powder conductivity<10-10S·cm-1. The cyclic voltammetric studies have been carried out on Cu(Ⅱ)(TAAB)(BF4)2 complex and show a nearly reversible one-electron redox process at E1/2= +0.0651 Vversus saturated calomel electrode.
    Fibre-optic Sensor of Fluorescence Enhancement for the Determination of Sodium Ions Based on the Inner Filter Effect of Fluorescence
    HUO Xi-Qin, WANG Ke-Min
    1995, 16(4):  518-522. 
    Asbtract ( )   PDF (417KB) ( )  
    Related Articles | Metrics
    Recently, many reversible optical chemical sensors based on ion-exchange schemes for sensing metal ions with comparable selectivities are developed. Most sensors of this kind reported so far are based on absorbance measurements. However, luminescence technique is an especially suitable optical chemical sensing method for designing these sen sors. This is due in part to its inherent sensitivity, its almost complete inertness to turbidity effects, and its flexibility with respect to geometric arrangements. In this paper, a fibre-optic sensor of fluorescence enhancement for sodium ions has been developed on the basis of ion-exchange sensing scheme. Asuitable fluorescer is incorporated in the sensing membrane containing a lipophilic pH-indicator and sodium-selective neutral ionophore. Fluorescence varies as a function of the varying absorption of the pH-indicator which in turn is modulated by the sodium concentration through the inner filter effect of fluorescence. The sensor shows a linear reversible response to sodium ion over the range of 1× 10-2─2×10-5mol/Lwith a detection limit of 8 × 10-6mo/L. The response time of the sensor is about 2-3min. The concentrations of sodium ions in serum and mineral water samples are determined by this sensor with satisfactory results.
    Simultaneous Determination of Europium and Terbium by Derivative Fluorometry with Pyrazine-2,3-Dicarboxylic acid System
    LIU Shu-Ping, HUANG Han-Guo
    1995, 16(4):  523-526. 
    Asbtract ( )   PDF (303KB) ( )  
    Related Articles | Metrics
    The paper studies the stoichiometry and the fluorescence emitting mechanism of Eu3+,Tb3+complexes with pyrazine-2,3-dicarboxylic acid. The optimum conditions of simultaneous determination for Eu3+, Tb3+by derivative fluorometry are established. The interference of other ions is investigated. The detection limits of Eu3+, Tb3+are 4.0ng/mLand 2.0ng/mL, respectively. This method for analyzing the amount of Eu3+, Tb3+in rare earth samples has been proved to be satisfactory.
    Application of Factor Analysis to Differential Rate Kinetic Analysis(Ⅰ) ──Simultaneous Determination of Epinephrine and Norepinephrine
    CAI Ru-Xiu, DANG Jiang, LIN Zhi-Xin
    1995, 16(4):  527-531. 
    Asbtract ( )   PDF (369KB) ( )  
    Related Articles | Metrics
    Amodified target factor analysis(MTFA)method has been applied to differential rate kinetic system in which synergic effects are taken into account in this paper.Asimple differential kinetic method by stopped-flow and MTFA has been proposed.In the meantime,the optimum experiment conditions of oxidation of EPand NE with Fe(phen)33+were investigeted. This mehtod has been applied to the determination of two component EPand NE with satisfactory results. The accuracy the of method was greatly improved.
    An Investigation on Analytical Peformance of Microwave Plasma Obtained with Surfatron and Microwave Plasma Torch
    ZHANG Han-Qi, WANG Ying, YE Dong-Mei, LIANG Feng, JIN Qin-Han
    1995, 16(4):  532-535. 
    Asbtract ( )   PDF (356KB) ( )  
    Related Articles | Metrics
    Surfatron and microwave plasma torch(MPT)are two types of microwave plasma(MWP) sustaining devices. In this paper, the performance of these devices used in atomice mission spectrometry was examined. The experimental results indicate that both surfatron and MPT have some advantages, However, the overall performance of the latter is better than that of the former.
    The Application of Atomic Absorption Spectrometry to Organic Analysis(Ⅲ)──Determination of Tannins in Tea
    WANG Ji-De, TIAN Li-Qing, WANG Lian-Sheng
    1995, 16(4):  536-539. 
    Asbtract ( )   PDF (421KB) ( )  
    Related Articles | Metrics
    In this paper,a new indirect method for determining tannins in tea by atomic absorption spectrometry is studied. Tannins in tea is extracted with mixed extractant of methyl isobutyl ketone(MIBK)and butyl alcohol and separated from the sample solution,then Cu3(PO4)2reagent is added to react with tannins in organic phase,the uncosumed reagent is centrifuged to subside, the Cu in supernatant is determined by AAS, and the concentration of tannins in tea is obtained. The interference of coexisting amino acid can be eliminated by this method,and the results of official method and ours show no difference,the recoveries are between 94%-104%,and the avarage relative standard deviation is 3.1%.
    Mass Spectrometric Study of Zirconium (Ⅳ)β-Diketonates
    LAING Ze-Bin, CHAI Zhang, LI Bi-Qin
    1995, 16(4):  540-542. 
    Asbtract ( )   PDF (236KB) ( )  
    Related Articles | Metrics
    The mass spectra of eight-coordinateacetylacetona zirconium(Ⅳ)were studied.The ion fragmentation pathways in the mass spectra are investigated on the fragment ions of acetylacetonatezirconium. Zrconium oxide [ZrO2H]+is the smallest metal-containing frag ment resulting from Zr(acac)4ion dissociation reaction. The molecular ion is obtained by regulating the degree of desolvation of sample molecules introduced into the ion source with the continuous flow probe and the analytes is the solution of Zr(acac)4in acetylacetone. The mass spectra of eight-coordinate trifluoro-acetylacetonatezirconium are reported in brief.
    Synthesis and Studies on Properties of Water Soluble Chinese Rape Pollen Dodecapeptide
    WAN Kai-Ke, SONG Yan-Ling, JI Ai-Xue, JIN Sheng
    1995, 16(4):  543-548. 
    Asbtract ( )   PDF (451KB) ( )  
    Related Articles | Metrics
    We have prepared a dodecapeptide, which was first extracted from Chinese rape pollen, by using solid-phase synthesis method.In order to study its structure function relation, seven peptide segments and five analogues were designed and synthesized. We have initially discussed their structures in solid state and different solvents using FTIRand CDspectra. In addition, their immunopromotive activies have been observed by E-rosette test, tumor necrosis factor(TNF) test and T-lymphocyte transformation test in vitro. The observed results show the dodecapeptide and some segments can cause the maturation of pig thymocyte in vitro and enhance the activity of TNF on murine tumor cells.
    Studies on the Enzymological Properties of Antibody Induced by N-hydroxymethylmesohemin
    FENG Yan, GAO Shu-Juan, GAO Gui, LIU Xi-Yu, YANG Tong-Shu, LIU Zi
    1995, 16(4):  549-552. 
    Asbtract ( )   PDF (303KB) ( )  
    Related Articles | Metrics
    N-hydroxymethylmesohemin was used as haptin to elicit monoclonal antibody 11D1through the immunization and cell fusion techniques.The antibody had the ability to combine with mesohemin and showed the activity of peroxidase.Further investigations demonstrate that the affinities of antibody for haptin and mesohemin were 1.1×10-6and 2.1×10-6mol/Lrespectively. When antibody-mesohemin complex catalyzed reaction, its Kmand Kcatfor H2O2were 13. 0 mmol/Land 86 min-1respectively. Compared with the noncat alyzed reaction, the activity of antibody-mesohemin complex elevated 1.8× 104(mol/L)-1.
    Syntheses and Properties of Terminal-vinyl Liquid Crystal Crown Ethers
    CHEN Yan-Fei, HUANG Zai-Fu
    1995, 16(4):  553-558. 
    Asbtract ( )   PDF (508KB) ( )  
    Related Articles | Metrics
    Four terminal-vinyl liquid crystal crown ethers(LCCEs)(ⅠⅡ,Ⅲ,Ⅳ)containing 15-crown-5 were synthesized. Their structures were confirmed by IR, NMR, MS, and EA. The relationships between these LCCEstructures and their UV, MS,IR and LR(Laser Raman)spectra were discussed in detail. Their thermodynamic properties and textures were studied by using the differential scanning calorimetry(DSC)and hotstage light-polarized microscope.The results showed that only the biphenyl compounds(Ⅰ,Ⅱ) possessed the liquid crystalline properties.
    Studies on Condensed Heterocyclic Compounds (XV)──Synthesis of 3-(1H-benzotriazole-1-methylene)-1,2,4- triazolo(3,4-b)-1,3,4-thiadiazoles
    ZHANG Zi-Yi, ZOU Ning, YANG Feng-Ke
    1995, 16(4):  559-562. 
    Asbtract ( )   PDF (328KB) ( )  
    Related Articles | Metrics
    By the condensation of 3-(1H-benzotriazole-1-methylene)-4-amino-5-mercapto-l,2,4-triazole with substituted benzoic acids in the presence of phosphorus oxychloride,ten novel 3-(1H-benzotriazoles)were obtained. Their structures were determined by elementary analysis, IR,1HNMR and MS. Their spectral properties were also discussed.
    Chemistry of 1,2,4-Triazines (XXIV)──Synthesis of Pyrazolo-(5,4-e)-1,2,4-triazine Derivatives
    SHA Yao-Wu, CAI Meng-Shen
    1995, 16(4):  563-567. 
    Asbtract ( )   PDF (284KB) ( )  
    Related Articles | Metrics
    Two potential anti-tumour compounds,3-methylthio-7-oxo-7,7,8,9-tetrahy-dropyrazolo-(5,4-e)-1,2,4-triazine(9)and 3-methylthio-7-thio-7,7,8,9-tetrahydropyrazolo(5,4-e)-1,2,4-triazine(10)were synthesized.Anew mild condition was introduced to the thionation of 1,2,4-triazine ring. Selective hyrazinolysis of three positions of similar reactivity on 1,2,4-triazine ring was improved. Anew reaction was applied in the preparation of 1, 3,4-oxa-diazole compound from hydrazyl derivatives with ethyl acetate.
    Synthesis of O-Alkylphenylthioureidophosphonothioates──A Study of the Compounds Including P-C Bonds
    HU Shi-Xian, ZHANG Ji-Cai, DING Yan-Wei, ZHAO Hong-Gang
    1995, 16(4):  568-571. 
    Asbtract ( )   PDF (272KB) ( )  
    Related Articles | Metrics
    By the reactions of O-alkylphenylthiocyanatidophosphonothioates with amines,two series of O-alkylphenylthioureidophosphonothioates were prepared.The structures of these compounds have been confirmed by IR, NMR and elementary analysis.The results from the biossay show that these compounds have no significant herbicidal activity.
    Studies on Chemical Constituents of Clycyrrhiza uralensis Fisch
    SHEN Feng-Jia, HU Jin-Feng, YU Ya-Chuan, XU Zhi-Dong
    1995, 16(4):  572-574. 
    Asbtract ( )   PDF (212KB) ( )  
    Related Articles | Metrics
    Six compounds were isolated from the roots of Glycyrrhiza uralensis Fisch and their structures were identified by chemical and spectroscopic methods. Three of them are new:6″-O-acetylliquiritin(Ⅰ),3β-formylglabrolide(Ⅱ), 22β-acetylglabric acid(Ⅲ); the others are known compounds:2,3-dihydroisoliquiritigenin(Ⅳ),3-oxo-glycyrrhetic acid (Ⅴ),3-acetylglycyrrhetic acid(Ⅵ)which are obtained from the plant firstly.
    Studies on the Reaction of Thiophosphoryl (Thiophosphonyl)Diisocyanate with Various Amines
    YANG Hua-Zheng, HUANG Zhan-Ao, LIU Feng-Ping
    1995, 16(4):  575-578. 
    Asbtract ( )   PDF (293KB) ( )  
    Related Articles | Metrics
    Phosphoro(n)diureidothioates and 1,3,5-triaza-2-phosphorin(nin)-4,6-dione derivatives were synthesized by means of the reaction of thiophosporyl(thiophosphonyl) diisocyanate with amines, respectively, according to the different amines and their molar ratio,the polarization of solvent and reaction temperature.The structures of the compounds synthesized and their properties of IR, NMR and MS spectrum were discussed. The biological tests show that these compounds have herbicidal activity and could inhibite the formation of chitin.
    Syntheses and Properties of Unsymmetrical Trimethine Cyanines Containing Quinoline End Group
    YAO Zu-Guang, CHEN Xia-Hua, ZHANG Qing-Hua
    1995, 16(4):  579-581. 
    Asbtract ( )   PDF (227KB) ( )  
    Related Articles | Metrics
    Eleven unsymmetrical trimethine cyanines containing quinoline end group were synthesized.The structures of the compounds were comfirmed by elementary analysis,IR and 1HNMR.Their electronic absorption spectra,photostabilities and spectral sensitizing properties were studied.
    Synthesis of (Z)-3-Butylidene-4-hydroxyphthalide
    LI Shao-Bai, WANG Zhi-Wei, FANG Xiao-Ping, LI Yu-Lin
    1995, 16(4):  582-584. 
    Asbtract ( )   PDF (219KB) ( )  
    Related Articles | Metrics
    (Z)-3-Butylidene-4-hydroxyphthalide(1)was prepared from 2-formyl-3-methoxy benzoic acid(2).2 was converted to 2-pentenyl-3-methoxybenzoic acid(4)by the usual method.4 was dissolved in sodium bicarbonate solution and reacted with a solution of iodine in aqueous potassium iodide to give 5 and 6,which was converted to 3-propyl-5-hydroxyiso coumarine(3)by the conventional method.Iodophthalide(5)was treated with sodium acetate to furnish(Z)-3-butylidene-4-methoxyphthalide(7).Demethylation of 7 was conducted with boron tribromide to give the title compound(1).The overall yield of 1 is 46%.
    Synthesis and Insecticidal Activities of New Pyrethroids Containing γ-Aryl Allyl Alcohol Moieties
    CHEN Ya-Juan, HUANG Run-Qij, MA Jun-An
    1995, 16(4):  585-587. 
    Asbtract ( )   PDF (185KB) ( )  
    Related Articles | Metrics
    Aseries of new pyrethroids containing γ-aryl allyl alcohol moieties were synthesized by using the esterification of 2,2-dimethyl-3-(2,2-dimethy vinyl)cyclopropane carbonyl chloride and 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane carbonyl chloride with γ-aryl allyl alcohols. Their structures were confirmed by means of IR,1HNMR,MS and elementary analysis.The preliminary biological test shows that some of the compounds have highly insecticidal activities,but the knock down activities against mosquito are lower than PY116.
    Studies on the Derivatives of Phenylcarbonylmethyl Aryloxyacetate
    SHI Yan-Nian, FANG Jian-Xin, LI Shi-Ming
    1995, 16(4):  588-590. 
    Asbtract ( )   PDF (207KB) ( )  
    Related Articles | Metrics
    Nineteen new derivatives of phenylcarbonylmethyl aryloxyacetate were synthesized by the reaction of potassium aryloxyacetate with bromomethyl phenyl ketone using 18-crown-6 as the phase transfer catalyst. Their structures were identified by IR, 1HNMR,MS and elementary analysis. The results from the preliminary biological test show that some of these compounds enhanced or inhibited the growth of wheat coleoptile. The stimulating wheat coleoptile growth abilities of Ipand Iqare similar to or higher than that of the parent regulator──2,4-Dand 4-CPA.
    An Improvement on the Preparation of SO42-/ZrO2Superacid
    MIAO Chang-Xi, CHEN Jian-Min, GAO Zi
    1995, 16(4):  591-594. 
    Asbtract ( )   PDF (389KB) ( )  
    Related Articles | Metrics
    The effects of preparative conditions on the properties of ZrO2precursor and SO42-/ZrO2superacid were studied in detail by means of BET,XRD,flow Hammett indicator method, hemical analysis and butane isomerization reaction at low temperature. Under different conditions. the specific surface area of ZrO2precursor may differ by a factor of 1.8,while the acid strength and the rate constant for butane isomerization at 20℃ of SO42-/ZrO2superacid may differ approximately by a factor of 1000 and 300, respectively. When appropriate preparative conditions are selected, the maximum specific surface area of ZrO2obtained is 245 m2/g and the maximum acid strength and rate constant for butane isomerization at 20℃ are H0≤-16. 0 and 15. 5×10-3h-1,respectively.
    Studies on Lyotropic Liquid Crystal for the System of CPDB/n-Butanol/n-Octane/H2O by 2HNMR and DSC Methods
    LI Gan-Zuo, HAO Jin-Cheng, ZHENG Li-Qiang, LI Fang, HAO Shu-Xuan, WANG Han-Qing
    1995, 16(4):  595-598. 
    Asbtract ( )   PDF (381KB) ( )  
    Related Articles | Metrics
    The isothermal phase diagram for the system cetylpyridinium bromide/n-butanol/n-octane/H2O has been determined at 40℃,The 2HNMR spectroscopy and DSC methods have been used in deterimining the structures. The results showed that the liquid crystal phase constructures not only changed with variation of the content of water at a certain temperature, but also changed with variation of temperature at a certain composition.
    Kinetics of Laser-Induced Reaction of Ge(111) With Cl2Under Laser Irradiation at 1064nm
    ZHANG Kang-Zhan, QIN Qi-Zong
    1995, 16(4):  599-602. 
    Asbtract ( )   PDF (302KB) ( )  
    Related Articles | Metrics
    Laser-induced gas-surface reaction of Ge(111)surface with chlorine is investigated by a CW supersonic molecular beam under a pulsed laser irradiation at 1064 nm.Amajor desorbed reaction product GeCl2is determined at different surface temperatures by a timeresolved mass spectrometry.The reaction yield of GeCl2increases obviously with increasing the translational energy of the incident chlorine molecules,laser fluence and surface temperature. But the translational temperature of GeCl2measured by time-of-flight spectra are independent of incident Cl2tanslational energy and laser fluence. Apossible reaction mechanism for the laser-induced reaction of Ge(111)with Cl2at 1064 nm mainly consists of the dissociative chemisorption of Cl2on the surface,the reaction of absorbed Cl with Ge atoms and the laser-induced thermal desorption.
    Studies on the Synthesis and Characterization of Ti-ZSM-11 and the Selective Oxidation of Styrene
    ZHANG Fu-Shun, WU Zhi-Yun, ZHANG Chun-Lei, KAN Qiu-Bin
    1995, 16(4):  603-607. 
    Asbtract ( )   PDF (342KB) ( )  
    Related Articles | Metrics
    Ti-ZSM-11 zeolite was synthesized by three different hydrothermal crystalline methods.The structure and properties were investigated by XRD,SEM,IR,TG-DTA, XPS, DRS. The results show that Ti4+occupies Tsite of the framework of the zeolite, The unit cell parameters and the intensity of the ～970 cm-1band in IR spectra increase with in creasing Ti content,as well as the activity of the selective oxidation of styrene.At the active centres,the Ti(Ⅳ)are isolated from each other and form long sequences, not having other Ti(Ⅳ)as neighbours.The oxidative abilities of TS-2 are similar to three different porphyrins in their catalytic properties.
    The effect of the Framework Stability of USY Zeolite on the Sintering of Molybdenum in Mo/USY Catalysts
    NIU Guo-Xing, LI Quan-Zhi
    1995, 16(4):  608-612. 
    Asbtract ( )   PDF (371KB) ( )  
    Related Articles | Metrics
    Mo/USYsamples,prepared by conventional impregnation with(NH4)6Mo7O24solution and calcined at 300,400,500,600℃,were characterized,by XRD,XPS, 29Si MAS NMR and 27AlMASNMR,acidity measurement with IR-TPDand NO chemisop tion.The results obviously show that Mo incorporation induces an aluminium extraction from the framework of zeolite.When molybdenum is dispersed over the support at low calcination temperature(<400℃),it mainly extracts aluminium of Si(2Al)in the framework of USYzeolite. However,sintering at a high calcined temperature,molybdenum mainly extracts aluminium of Si(1Al) from the framework.There are two steps in the process of sintering of molybdenum in Mo/USY catalysts. First, molybdenum makes USY zeolite dealuminate sharply and destroy the framework,and then immediately forms bulk Al2(MoO4)3with the non-framework aluminium originated from the framework of USYzeolite.
    Quantum Chemistry Study on the Potential Barrier for HydrogenAbstraction from Hydrogenated Diamond (111) Surface
    RONG Chui-Qing, LI Yan-Xin
    1995, 16(4):  613-617. 
    Asbtract ( )   PDF (395KB) ( )  
    Related Articles | Metrics
    The hydrogen abstraction from the diamond surface involves three electrons,erefore,the potential barrier for Habstraction from the(111) surface of diamond has been culated by MNDO(UHF) method. On the basis of systematical comparison with the experimental active energies of gas-phase organic molecules, the calculated results for a group of clusters with increasing sizes converge to 41. 8±4. 2 kJ/mol. The reslts are also compared with the related results obtained by MNDO(RHF) and AM1(UHFand RHF).
    Quantum Chemistry Study of the Rearrangement and DissociationProcesses on the Potential Energy Surfaces of H2BO
    LI Xue-Kui, LI Bo-Fu
    1995, 16(4):  618-621. 
    Asbtract ( )   PDF (283KB) ( )  
    Related Articles | Metrics
    The rearrangement and dissociation processes on H2BO potential energy surface are presented. Equilibrium and transition state geometries were determined by using the energy gradient technique at both UHF/3-21G and MP2/3-21Glevels.
    Electrocatalytic Oxidation of Methanol on Platinum Dispersed in Poly(2,5-dimethoxyaniline)Conducting Polymers
    WAN Ben-Qiang, WU Wan-Qun
    1995, 16(4):  622-625. 
    Asbtract ( )   PDF (302KB) ( )  
    Related Articles | Metrics
    The poly(2,5-dimethoxyaniline)(PDMA)film electrode(Pt/PDMA/GC)with platinum microparticles was prepared by electrochemical method.The cyclic voltammograms indicate that the oxidative peak current of methanol at the Pt/PDMA/GCelectrode increases obviously than bare Pt electrode.The effects of the thickness of PDMAfilm, the quantity of platinum microparticles, the concentration of methanol and time on the catalysis are also discussed. The electrode exhibited an excellent and a long-term stability in the acidic methnaol solutions.
    The Quantum Chemical Investigation on the Rhodium Carbonyl Hydride Species
    ZHANG Hua-Bei, HU Chang-Wei, TIAN An-Min, YAN Guo-Sen
    1995, 16(4):  626-628. 
    Asbtract ( )   PDF (237KB) ( )  
    Related Articles | Metrics
    The electronic and geometric structures,the vibrational frequencies and the intensities of a series of rhodium carbonly hydride species were investigated by use of the ab initio calculation. It was predicted that the rhodium carbonyl hydride species containning1,2 and 3 hydrogen atoms could exist during the hydrogenation of CO or CO2on Rh catalyst.Hatom was tending to exclude CO out of the systems when the number of Hin the system increased. In all the calculated rhodium carbonyl species, the most intensive vibrational mode,the intensity of which increased with increasing Hcoadsorbed, was caused by Rh-Hvibration other than C-O, while an obvious counterside effect usually observed in complex compound was seen in(H)3RhCO[Cs].The redshift of CO+H2Rh system from 2050 cm-1to about 2000 cm-1observed in experiments might be caused by the vibration of Rh-Hinstead of that of C-O,the intensity of which was predicted to blue shift and diminish with increasing Hnumber in the rhodium carbonyl hydride species.
    Fluorescence Enhancing and Energy Transfer on Bimolecular Layer Induced by Aggregation
    WU Li-Xin, ZHENG Hui, LIANG Ying-Qiu
    1995, 16(4):  629-631. 
    Asbtract ( )   PDF (285KB) ( )  
    Related Articles | Metrics
    Single chain benzalaniline containing ammonium amphiphiles formed vesicle bilayers in the aqueous solution. Being a kind of chromphore,the benzalaniline group embeded in amphiphiles is active for absorption and fluorescence, No very strong excitation and emission intensities were determined in ethanol dispersion, but the phenomenon was found in the aqueous solution,that is tight aggregation of bimolecular layer induced fluorescence enhancing.The reason is that the tight aggregation made the molecule arrangement orderly so that little excitation energy was exhausted by nonradiative transfers such as thermal collision, conformation divert and so on.This process is very favorable for energy transfer because it was not observed in liquid crystal state and in ethanol dispersion.The result reveals that more orderly arrangement of amphiphiles in bilayers is benefit to controlling energy transfer and increasing the transfer effect across membranes.
    The Chemical Probe of Molybdenum-Micro-Surrounding on Nitrogenase
    HUANG Jin-Wei, ZHANG Hong-Tu, YANG Ru, ZHOU Ming-Yu, WAN Hui-Lin, CAI Qi-Rui
    1995, 16(4):  632-634. 
    Asbtract ( )   PDF (219KB) ( )  
    Related Articles | Metrics
    Aerial oxidation of solution of chemically synthesized Mo-Fe-Scluster [Cl2FeS2MoS2FeCl2]2-has been shown to yield a 1. 50: 1 mixture of MoOS32-and MoS42-.It is evident that the ratio of the concentration of MoOS32-and MoS42-is lower than that produced by the oxidative degradation of natural FeMo-co (△CMoOS32-/△CMoS42- =3:1), so it can be inferred that the oxidative degradation of the cluster containing MoS4core can not give the same result with the oxidative degradation of natural FeMo-co, and there should be three sulfur atoms in molybdenum-micro-surrounding on nitrogenase.
    Ultrastructure of Liquid Crystalline Polyacrylates Containing p-Nitro Azobenzene
    LI Min, ZHOU En-Le, XU Ji-Ping
    1995, 16(4):  635-638. 
    Asbtract ( )   PDF (312KB) ( )  
    Related Articles | Metrics
    The phase behaviour of the side chain liquid crystalline polyacrylates containing pnitro azobenzene was studied by DSC,WAXD and the polarized optical micioscopy. It was shown that nematic phase can be formed for hmopolymer HP6,no LC phase can be observed for HP3and HP4; whereas smectic SAdphase can be obtained for Pnwhen n was equal to 3,4, 6,8. The unique phase behaviour of the copolymers Pnwas due to the existence of Hbond between-COOH and-NO2which has been confirmed by FTIR. The molecular arrangement of the copolymers in their LCstates was proposed from the results of WAXD and FTIR.
    The Chain Structure and Light Scattering Studies for Acrylamide-Sodium Acrylic Acid(AM-AA)Copolymers
    BO Shu-Qin, ZHOU Zi-Nan, HAO Ke-Jun, YANG Hong, WU Shen-Rong
    1995, 16(4):  639-642. 
    Asbtract ( )   PDF (338KB) ( )  
    Related Articles | Metrics
    Aset of AM-AAcopolymer samples with the same comonomer content and differ ent average molecular weight have been chracterized by 13CNMR and light scattering methods in this paper.The chemical composition(comonomer AA,mole content 16.9±1.1%)of these samples is uniform, the sequence of AA in the macromolecular chain is of alone and random distribution and the light scattering theory from polyelectrolyte in added-salt solutions is suitable for the AM-AA copolymers-0.12 mol/L NaCl water systems. The actual values of Mw,the second Virial coefficient A2and the mean square radius of gyration〈R2〉zfor the studied samples have been obtained,The relationships between the molecular parameters are as follows:A2=0.0619Mw-0.21,〈R2〉z1/2=0.0210Mw0.54.
    Studies on Adsorption Properties for Bilirubin of NovelCrosslinked Chitosan Resins
    ZHANG Yue-Hua, ZHANG Yan, HE Bing-Lin
    1995, 16(4):  643-647. 
    Asbtract ( )   PDF (482KB) ( )  
    Related Articles | Metrics
    With chitosan as the raw material,a novel bead form of polymeric adsorbent withhigh sorption capacity for bilirubin was obtained by the reaction of glutaric dialdehyde withchitosan. From the preliminary determination of bilirubin sorption,it was indicated that thesorbents have a good adsorption properties for bilirubin.The sorption of bilirubin was related to the degree of crosslinking of the sorbent,concentration of bilirubin,ionic strength,temperature and PHvalue.
    Preparation and Characterization of Mercuriated Copolymer of N-Vinylcarbazole and Acrylic Acid
    B. Gereltu
    1995, 16(4):  648-652. 
    Asbtract ( )   PDF (377KB) ( )  
    Related Articles | Metrics
    Both linear and cross-linked copolymers of N-vinylcarbazole and methylacrylate were prepared and mercuriated by using mercury trifluoroacetate in THF or dichloromethane. The mercuriated copolymers, both linear and cross-linked, were hydrolyzed with sodium hydroxide in a mixture of water and THF. The hydrolyzed mercury loading linear copolymer was soluhle in water,and the hydrolyzed mercury loading crosslinked copolymer was a water-absorbing polymer. The iodination of the hydrolyzed mercuri ated copolymers was carried out in water with KI3, and the iodination of unhydrolyzed mer curiated copolymers was done in THF with I2. The forms of the hydrolyzed mercuriated polymer chains could be changed in different solvents and the change of the forms could af fect both iodination and fluorescence intensity of the corresponding mercury loading copoly mer.
    The Effect of Crosslinking Density on Dynamic Mechanical Properties of Polyurethane/Polystyrene Interpenetrating Polymer Networks
    HAN Qing-Guo, WANG Jing-Yuan, LIU Rui-Ying, LI Yu-Wei, TANG Xin-Yi
    1995, 16(4):  653-656. 
    Asbtract ( )   PDF (291KB) ( )  
    Related Articles | Metrics
    In this paper polyurethane/polystyrene IPNs was synthesized by simultaneous synthesis method.The effects of crosslinking density of one and two netWorks on the dy namic mechanical properties were reported by variation of NCO/OH ratio,30H/2OHratio,the types of isocyanate,the molecular weight of polyethyl-glycol,(2-hydroxyethyl methacrylate and divinyl benzene,The results show that increasing crosslinking density and interpenetrating entanglement introduce"forced compatihility", so that it accelerates curing rate and decreases the phase separation. When the network curing rate is so fast,the compatibility of IPNs decrease for the incompatibility IPNs. One of the important factors of controlling IPNs phase separation is that the two networks cure simultaneously.
    Studies on Syntheses and Adsorption Properties of Tertiary AmineType Chelating Resins Containing Hydroxyl (mercapto) Groups
    NI Cai-Hua, XU Yu-Wu
    1995, 16(4):  657-659. 
    Asbtract ( )   PDF (210KB) ( )  
    Related Articles | Metrics
    Tertiary amine type chelating resins containing hydroxyl(mercapto) groups have been synthesized through the reactions of polymers PE with diethylaminomethyl-thiirane and dietliylaminomethyl-oxirane respectively in this work. The adsorption properties of the resins to some metal ions such as Ag (Ⅰ), Au (Ⅲ), Pd (Ⅱ), Pt (Ⅳ), Hg (Ⅱ), Cu (Ⅱ), Zn (Ⅱ) have been measured by static method. It is found that the chelating resins have good adsorption properties to some noble metal ions.
Special Issues
More...
Download
More...
Links
More...