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    24 May 1994, Volume 15 Issue 5
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    Articles
    The Design of Topological Framework Structure for Analogues Correlated to AlPO4-5 in the Orthorhombic System
    XU Yi-Hua, YANG Jun-Tao, SHA Xiu-Hong, LI Bao-Zong, XU Ru-Ren
    1994, 15(5):  631-636. 
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    AlPO4-5 molecular sieve is one of typical aluminophosphates molecular sieves,which has a main porous system of 12 member rings. It belongs to hexagonal system. Now we had found the structure can be derived into a lot of orthogonal framework structures. In this paper, the 64 topological framework structures of analogues correlated to AlPO4-5 in the orthorhombic system have been designed by the computer modelling technique. Their theoretical X-ray powder diffraction patterns have beem calculated, and the probability of their existence has been discussed. The X-ray powder diffraction patterns of a synthesized orthogonal AlPO4-5 are in good agreement with the theoretical ones, It proves the existence of materials of orthogonal AlPO4-5.
    Studies on Coenzyme B12 Model Compounds(Ⅵ)─The Influence of Axial and Equatorial Ligands on the Stabilities or Co-C Bonds of RCo(salen)L and RCo(SB)Complexes
    HAN De-Yan, CHEN Hui-Lan, WU Qin-Yuan, ZHOU Jin-Suo, TANG Wen-Xia
    1994, 15(5):  637-641. 
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    Two series of alkylcobalt Schiff base complexes RCo(chel)L(where R=CH3,C2H5, n-C3H7, n-C4H9, i-C4H9; chel=salen and SB; L=py,γ-pic, PPH3)were synthesized and characterized in which RCo(SB)Land five-coordinate C2H5Co(SB) are new coenzyme B12 model compounds. The properties of alkylcobalt complexes in solution and solid were studied. The influence factors on the stabilities of Co-Cbonds of the complexes were discussed.
    preparation of Hydrotalc Pillared with Ternary PCuW11 Heteropolyanion
    HE He-Ming, SUNT Tie, LU Hui-Juan, JIAND Da-Zhen
    1994, 15(5):  642-645. 
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    Ternary heteropoly compound was prepared by introducing cupric ion into the framework of PW12 heteropolyanion with Keggin structure. The characterization of XRD showed that the value of d001 was 1. 46 nm. The IRband of heteropolyanion was similar to that of the precausor heteropoly salt. The cupric ion in the heteropolyanion was situated in a cubic cone field with pentadentate. Its symmetry was reproduced by introducing the heteropolyanion into the hydrotalc layered region. The stability of pillared hydrotalc is higher than that of pure heteropolyanion.
    Synthesis and FTIR Spectroscopy Study of the Rare Earth Complexes with D-Glucose
    YANG Yan-Min, WENG Shi-Fu, WU Jin-Guang, XU Guang-Xian
    1994, 15(5):  646-650. 
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    Rare earth complexes with D-glucose were successfully prepared in pyridine and characterized by elementary analysis and FTIRmeasurements. The experimental results indicate that each rare earth ion is coordinated to two glucose molecules and one pyridine molecule. The composition of rare earth complexes with D-glucose is Ln(C6H12O6)·(C5H5N)Cl3. The potential structure of this compound is discussed.
    Structure and Properties of Y Zeolites Modified by NH4BF4
    GAO Zi, XU Jin-Suo
    1994, 15(5):  651-654. 
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    A series of dealuminated Yzeolites containing no boron in the framework were prepared by treating conventional NH4Y with aqueous solution of NH4BF4. The structure and properties of these dealuminated Y zeolites were characterized with various techniques and compared with other types of modified Yzeolites. It was found that these zeolites have less dealumination defects, higher thermostability and specific acid site distribution,NH4BF4 treatment is a feasible modification method for preparing dealuminated Yzeolites with special features.
    The Relationship Between the Selectivity of Electrodes Based on Polyether Derivatives of o-Phenanthroline and Extraction Constants of Amine Species
    ZHANG Zeng-Rong, YU Ru-Qin
    1994, 15(5):  655-658. 
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    Electrodes based on polyether derivatives of o-phenanthroline were prepared. The potentiometric response characteristics of the electrodes prepared were investigated.The extraction constants Ke of amine species were determined in the presence and absence of polyether derivatives of o-phenanthroline in the organic phase. The relationship between the electrode selectivity and Ke was examined. The benzylamine selective electrode based on polyether derivative of o-phenanthroline showed the following selectivity order: benzylamine >ethylamine>tetraethylammonium>triethylamine>diethylamine>ammonium. This was exactly the extraction constant sequence of the amine species. The PHEN19C7-based electrode was used to determine the Mexiletine content in pharmaceutical preparations with satisfactory results.
    Investigations on the Zeolite-Modified Electrodes(Ⅰ)──The Electrochemical Behavior of H2Q/Q Redox Couple at the Zeolite-modified Electrodes
    ZHOU Yi-Ming, ZHOU Zhi-Hua, MENG Zhong-Yue, XUE Kuan-Hong, YANG Hui
    1994, 15(5):  659-662. 
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    A procedure was described where an 13X-type zeolite film could be formed on a glassy carbon electrode. Using cyclic voltammetry, we surveyed the electroresponses of H2Q/Q redox couple at the modified electrode thus formed. The stable cyclic voltammograms were obtained rapidly, and were not altered when the temperature of the solutions was changed or the solutions were stirred, but they were effected by the solutions'pH values. It was observed that both the oxidation of H2Q and the reduction of Qwere catalyzed by the modified electrode when pH≤2.0.
    Studies on Shielding Effect of Self-assembly Molecular Deposition Film by Cyclic Voltammetry Method
    GAO Qian, GAO Mang-Lai, SUN Chang-Qing, ZHANG Xi, WU Bo-Shu, XU Hong-Ding, GUO Li-Ping
    1994, 15(5):  663-666. 
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    The shielding effect of molecular deposition (MD) film was studied by cyclic voltammetry. Many factors influencing the formation and stability of film were considered and optimal conditions for well-defined MDfilm onto gold electrode was obtained. The experimental results confirmed the orientated packing of molecular deposition film based on a process of self-assembly.
    The Study of Retroreflective Laser Beams Interference Phase-Shift Effect
    DENG Yan-Zhuo, HE Jin-Lan
    1994, 15(5):  667-668. 
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    This paper describes a novel optical interference effect, namely retroreflective laser beams interference phase-shift effect. When a focused He-Ne laser beam passes through a cuvette containing liquid sample, the two reflective beams (retroreflective beams)coming from the front and the back surfaces of the cuvette will recombine and generate optical interference effect. The optical-phase-shift between retroreflective beams at the time t depends upon the changes in refractive index of the sample △n. It has been deduced that the relative change of signal intensity at the detector is proportional to △n under the condition of △nl<<λ, where l is the length of the sample within the cuvette and λ is the laser wavelength.The possibility of determining the small changes in the concentration of micro-volume sample was verified experimentally. Its application to the capillary electrophoresis detector was also demonstrated.
    Studies on Performance and Factors Affecting Dispersion of Air-Segmented Flow Injection Analysis
    ZHI Zheng-Liang, TIAN Li-Qing
    1994, 15(5):  669-671. 
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    The effects of (a) flow-rate,(b) tube length,(c) tube inner diameter, (d) sample volume injected and (e) temp. on dispersion in an air-segmented flow injection system were studied and the performance of instrument was examined by using sample solution of iron(Ⅲ)sulfosalicylate. The results indicate that dispersion of sample plug is only dependent on sample volume and flow-rate. Tube length and diameter, temperature have only slight effect on the dispersion. So the proposed method was very suitable for the slow reaction systems and reactions need heating.
    A Study of Nafion-Mercury Film Chemically Modified Electrode for the Determination of GPT
    JIN Li-Tong, YE Jian-Shan, SHI Zhan-Ling, FANG Yu-Zhi
    1994, 15(5):  672-674. 
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    α-Ketoglutaric acid is determined by use of the Nafion-mercury film chemically modified electrode (Nafion-Hg film CME). The activity of GPTin human serum is determined indirectly. The linear range for the determination of α-ketoglutaric acid is 5. 0×10-3—1. 0×10-6 mol.L. The lowest detection is 5.0×10-7mol/L.The range for the determinaion of GPTis 2-200 U/L. This method has a high sensitivity and resists with disturbance.Good results were obtained for tests of human blood samples.
    Synthesis and Study of Fluorogenic Property Four Kinds of Coumarin Sulphonyl Chloride Derivatives
    CAO Qiu-E, XU Qi-Heng
    1994, 15(5):  675-677. 
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    Four kinds of coumarin sulphonyl chloride derivatives were synthesized and identified in this article. They are 4-methyl umbelliferone-6-sulphonyl chloride (MUS-Cl),4-methyl-7-acetoxyl coumarin-6-sulphonyl chloride (MACS-Cl),4-methyl-7-methyoxyl coumarin-6-sulphonyl chloride (MMCS-Cl),4-methyl coumarin-6-sulphonyl chloride (MCSCl).The effects of fluorogenic property of these reagents by the solvent polarity, pHof solution, time of light shining, effects of the surfactant were studied. Throught separation of reaction mixture by TLC, we also have studied the reaction of these reagents with aminoacid or amine and the possibility of these reagents as fluorogenic probe for these compounds.The results have suggested that all these reagents may be used as fluorogenic probe for amino-acid and amine.
    A New Algorithm for Library searching of organic Mass Spectrum
    LU Xiang-Jun, LIN Shao-Fan, ZHANG Jin-Bei, ZHANG Fa-Yi
    1994, 15(5):  678-680. 
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    Some new ideas for library searching of organic mass spectra are presented here.These include prescreening by the TMIP (three most intense peaks), and EC (Elemental composition) of the unknown if available, then followed by full spectrum matching using weight factor as criterion. By two-step index files and two-direction driven search strategy for TMIP, bit mapping and Boolean operation scheme for EC, and storing the value directly in the database, high efficiency and compact storage are achieved. Dozens of actual examples have been tested on the database which contains nearly 50000 reference compounds, and the results are satisfactory.
    The Activity and Thermostability of Immobilized Glucoamylase by Diazotization
    KONG Wei, ZHOU Hui, WANG Li-Ping, CHEN Zun, Li Wei, SHEN Jia-Cong
    1994, 15(5):  681-684. 
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    A method getting high activity and thermostability for the immobilized glucoamylase was found out.The glucoamylase was immobilized on porous anilino-sulfonic polystyrene beads by diazotization.The effects of immobilizing pH,immobilizing time and molecular weight of the substrate on the activity and thermostability of immobilized glucoamylase were investigated.The results obtained show that by prolonging the coupling time of diazol-protein,the activity of immobilized glucoamylase got to 20000 mg/hour g dry gel,and the thermostability was 5 times higlier than that of soluble glucoamylase.
    A Mechanistic Study of the De-t-butylation Reaction of 2,5-Di-t-butyl-p-dimethoxybenzene in Acid Systems
    GONG Yue-Fa, ZHAO Cheng-Xue, JIANG Xi-Kui
    1994, 15(5):  685-688. 
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    We have observed that the debutylation reaction can readily occur when 2,5-di-tbutyl-p-dimethoxybenzene (1) was mixed with perfluorocarboxylic acids or with AlCl3CH2Cl2 system,but did not occur with aqueous HI or HBF4 or absolute trichloroacetic acid.EPR observation shows that radical intermediates were generated in the former systems,but not in the latter case.Kinetic study indicates that the reaction of substrate 1 with trifluoroacetic acid behaves third-order kinetics,second in 1 and first in the acid.All the results reveal that an intrinsic relation may exist between the debutylation and the formation of the radical intermediates.
    Synthesis of Three-Ring-System Liquid Crystal Containing Ethylene Linking Group and Study of Their Phase Transition
    TANG Hong, XU Shou-Yi
    1994, 15(5):  689-692. 
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    Two series of three ring system liquid crystal materials containing ethylene linking group between a cyclohexyl and a phenylene ring were synthesized using the starting material──trans-4-alkyl cyclohexyl carboxylic acid. The details of the preparation steps were described.The influences of alkyl chain length on the phase transition temperatures were studied.The relationship between the physical properties and structures of two series of liquid crystal materials was discussed.
    An Elementary Model of Interaction Between Sulfonylurea Herbicide Molecule and Receptor
    LAI Cheng-Ming, YUAN Man-Xue, LI Zheng-Ming, JIA Guo-Feng, WANG Ling-Xiu
    1994, 15(5):  693-694. 
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    In this paper,an elementary model of interaction between sulfonylurea molecule and receptor has been suggested.The model is useful to explanation of some experimental rules of surfonylurea herbicide.
    Studies on the Synthesis of Trachylobagibberellin Analogues (Ⅰ)──Synthesis of12.16R-Cyclogibberate
    XIE Wen-Ge, CUI Yu-Xin, MA Jian-Tai, PAN Xin-Fu
    1994, 15(5):  695-696. 
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    A new trachylobagibberellin analogue methyl 2.16R-cyclogibberate was synthesized from gibberellic acid(GA3) 3 by a facile method of four steps. All intermediates were identified by MS,IRand 1D,2D NMR. The 1H and 13C NMR chemical shifts and stereochemical configuration of 1 were substantiated by one-dimensional and two dimensional NMRtechniques.
    The Chemistry of α-Oxo Ketene Cyclic Dithioacetals(ⅩⅤ)──Studies on the Substitution-Cycloaromathation Reaction of Adducts from β,β-1,3-Propylene-Dithio-α,β-Unsaturated Arylketones with Methallyl Grignard Reagent
    YANG Zhi-Yun, WANG Zi-Ling, LIU Qun, HU Yu-Lan
    1994, 15(5):  697-699. 
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    The addition of the title compounds 1 with methallyl Grignard reagent yielded the carbinols(2).Catalyzed by BF3·Et2O,the carbinols 2 can be converted to aromatic ether 3when the reaction was performed in lower alcohols which were used as the nucleophile.The conversion from 2 to 3 can be regarded as a substitution-cycloaromatization reaction in mechanism and proved to be a facile approach to the synthesis of this kind of compound(3).
    Synthesis of Some New Azole Compounds Containing Silicon and Their Biological Activities
    LI Wen-Ming, CHEN Fu-Heng
    1994, 15(5):  700-702. 
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    Thirteen new azole compounds containing silicon were synthesized.Their structures were confirmed by IR,1H NMR,MS and elementary analysis,The best way of silanization of the compounds was given.The relationships between the spectra and structures of the compounds were discussed.The preliminary biological test shows that some of them have fungicidal activities against several fungi.
    Catalytic Hydrogenation of 6,6-Diphenylfulvene in the Presence of Cp2TiCl2-i-PrMgBr
    HE Zheng-Jie, CHEN Shou-Shan
    1994, 15(5):  703-704. 
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    In this paper,we described catalytic hydrogenation of 6,6-diphenylfulvene in the presence of Cp2TiCl2-i-PrMgBr system under mild conditions,It was found that the low valent titanium catalyst from Cp2TiCl2 and i-prMgBr has a good activity for hydrogenation of the fulvene,and that the catalyst is active for isomerization of adduct hydrogen product.It was also found that there is an obvious gradient velocity of hydrogenation in the reaction.
    Studies on Nucleosides(Ⅳ)──Stereoselective Syntheses of Cinchophen Triazoline-Thione Nucleosides
    CHEN Hong-Ming, ZHANG Jian, AO Jian-Min, CAI Meng-Shen
    1994, 15(5):  705-707. 
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    In this paper,trifluoroacetoxy was used as the leaving group of sugar C-1.Seven new nucleosides were synthesized by treating-1-O-trifluoroacetyl-2,3,5-O-tribenzoyl-α-D-ribofuranose(Ⅱ) with 3-cinchophenyl-4-aryl-1,2,4-triazoline-5-thione (Ⅰ) in 1:1 molar ratio at r.t.. Their structures and compositions were characterized by elemental analysis and spectroscopic methods.
    Chemistry of 1,2,4-Triazines(XXII)──Synthesis of Imidazolo-(5,4e)-1,2,4-triazine
    SHA Yao-Wu, CAI Meng-Shen
    1994, 15(5):  708-710. 
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    Cyanogen hydrazide reacted with triethyl orthoformate at 140℃for 24 h.Through column separation,two compounds 1-(ethoxymethyleneiminyl)imidazolo-(5,4-e)-1,2,4-triazine and 5-methoxy-6-ethylamino 1,2,4-triazine were obtained.If the cyanogen hydrazide reacted with triethyl orthoformate at 100℃ for 24h,another compound.1-ethylamino-imidazolo(5,4-e)-1,2,4-triazine was obtained.
    Studies on the Properties of Light-induced Interface Charge Transfer Between Porphyrin Molecule and Modified n-GaAs(100),n-Si(111)
    YANG Ji-Hua, ZHANG Jie, GONG Ming-Xuan, WANG De-Jun, SUN Hao-Ran, CAO Xi-Zhang, BAI Yu-Bai, LI Tie-Jie
    1994, 15(5):  711-715. 
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    The properties of light-induced interface charge transfer between porphyrin,tetrakis-(4-trimethylaminephenyl)porphyrin tetraiodide(TTMAPPIH2) and modified n-GaAs (100),n-Si(111) were studied by the surface photovoltage spectroscopy(SPS) method.The result suggests that the efficiency of light-induced interface charge transfer between TTMAPPIH2 and n-G3As(100) is much higher than that between TTMAPPIH2 and n-Si (111).The obvious light-induced charge transfer between TTMAPPIH2 and n-GaAs(100) is also found in the no-absorption region of TTMAPPIH2.but it is not found between TTMAPPIH2 and n-Si(111),By using the relative energy level among TTMAPPIH2,nGaAs(100) and n-Si(111) determined by electrochemical measurement and UV-Vis absorption spectrum,the characteristie difference of light-induced interface charge transfer between TTMAPPIH2 and n-GaAs(100),n-Si(111) is explained satisfactorily.
    Monte Carlo Simulation Study of the Excess Properties of Fluid Mixtures
    WU Xiong-wu, SNI Jun
    1994, 15(5):  716-720. 
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    An efficient Monte Carlo simulation approach for the estimation of the excess properties of fluid mixtures,the stepwise sampling method,is proposed.This method is carried out by changing the identity of particles in a system one by one during the simulation,so that the whole composition region can be studied.and lots of excess properties can be estimated efficiently and accurately.By means of the proposed method, excess Gibbs free energy,excess enthalpy and excess volume of Argon-Krypton system within the whole composition range have been obtained.The results are compared with those published by McDonald with the conventional approximation method.
    Multi-dimensional Bond-Parametric Analysis of Molten Salt Conductance
    YAN Liu-Ming, ZHANG Wei-Ming, QIN Pei, CHEN Nian-Yi
    1994, 15(5):  721-724. 
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    The semi-empirical rules governing the molten salt electroconductivity are investigated using pattern recognition and artificial neural network method, together with chemical bond parameters. The mechanism and dominating factors of molten salt electroconductance are discussed by these results.
    Redox Polymer Modified Porous Electrodes
    LIU Pei-Fang, ZHA Quan-Xing, LI Xi, CHEN Jian
    1994, 15(5):  725-728. 
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    Three types of Nafion/Os(bpy)3Cl2 modified electrodes were prepared:(A)acetylene black powder microelectrode.(B) Teflon bonded acetylene black membrane electrode and (C) flat glassy carbon electrode,Experimental results show that the ratios of the redox center loading level for unit apparent electrode surface area are A:B:C= 103:102:1.Besides,it was found to be easier for Athan Band Cto form a thin and relatively uniform coating layer on the real surface,which is benificial to charge transfer in the modified layer,Aglucose oxidase(GOD) electrode was built based on the modified powder microelectrode,which gave an apparent current density 4.6 × 10-4 A/cm2 in 10 mmol/Lglucose solutions,about three orders of magnitude greater than that of an anolog of a flat glassy carbon electrode. The linear region of the former was up to 14 mmol/L, also better than the latter.
    Studies on Tunneling Effect in the Chemical Kinetics(Ⅱ)──Study on Interaction of Channels in Unimolecular Reaction or Formaldehyde
    CHEN Yu, ZHAO Xiao-Liang, ZHAO Cheng-Da
    1994, 15(5):  729-732. 
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    In this paper,we have obtained molecular Eckart barrier in thermal unimolecular reaction system,of formaldehyde,calculated the tunneling correction factor for this channel under several different temperatures,which proved the fact that tunneling effect under lower temperature is evident,and studied the interaction of molecular and radical channels,and calculated kuni(i),Ea(i) for each channel when tunneling effect was Considered for molecular channel but not existed in radical channel.The calculated results are in agreement with those from the experiments.
    Studies on Structure and Properties of Tetra-Phenylporphyrin and Its Derivatives(Ⅴ) ──Homologous Linear Rule of Amino-Substituted Tetraphenylporphyrin and Its Derivatives
    LI Liang-Chao, LUO Ming-Dao, QU Song-Sheng, HUANG Su-Qiu, YAN Xiao-Ci, YI Xing-Huan, OUYANG Li, LI Yu-Shan
    1994, 15(5):  733-736. 
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    The homologous numbers (n and N)of the porphine and amino-substituted tetraphenylporphyrin derivatives were determined.The spectra and the structural parameters are related to the homologous factor(1/2), respectively.According to this relation a set of the homologous linear equations was obtained:Y=a+b(1/2)2/N, r>0.98where a and b are constants, r is the relative coefficient.The red shift of λmax is explained.Some linear rules are obtained.
    Studies of Catalytic Reduction of Dioxygen at Nafion Film-Coated Electrodes(I)──The Effect of Electrostati Interaction on Electrocatalytic Performance of Nafion Film-Coated Electrodes
    ZENG Zhang-Yi, PAN Zhan-Chang
    1994, 15(5):  737-740. 
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    Two kinds of transition metal macrocyclic complex ions(one with negative charge,the other with positive charge)were incorporated in Nafion coatings respectively in order to make out two groups of Nafion film-coated electrodes. The electrocatalysis of reduction of dioxygen at these electrodes was studied by cyclic voltammetry. The effects of electrostatic interaction between the complex ion and Nafion coating on electrocatalytic performance of film-coated electrodes were approached. The reasons,which result in the significant changes in electrocatalytic performance of Nafion film-coated electrode in comparison to the modified electrode without Nafion coatings are discussed.
    A Study on Temporarily Water-soluble Disperse Dyes Containing Carboxymethylsulfonyl Group ──The Kinetics of Decarboxylation of Intermediates and Dyes
    WANG Mei, Pan Xin, LIU Jin-Xiang, GAO Xiu-Ying
    1994, 15(5):  741-744. 
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    The kinetics of decarboxylation of intermediates and dyes containing carboxymethylsulfonyl group was studied by thermogravlmetry. The temperatures of decarboxylation of initial,final,Tmax and intensive decomposition were obtained through experiment. The Avrami-Erofeev equation of n=1,which is the same formation as the first order chemical reaction, was used to describe the decarboxylation process. The apparent kinetic parameters were obtained.There is compensating effect between activation energy and frequency factor for these different intermediates and dyes.
    Syntheses and Structures of 17-Electron Pentadienyl Vanadium Carbonyl Complexes
    WANG Yue, LIU Ju-Zheng, FAN Yu-Guo, LIANG Ying-Qiu
    1994, 15(5):  745-749. 
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    Using four kinds of methyl pentadienyl ligands,carbonyl complexes of open metallocene vanadocenes,[2,4-(CH3)2C5H5]2VCO(I),[2,3-(CH3)2C5H5]2VCO(I)和[2-CH3C5H6]2VCO(Ⅱ)and[3-CH3C5H6]2VCO(Ⅳ)have been synthesized,in which I,Ⅲand Ⅳ are new complexes.I,Ⅱ,Ⅲ and Ⅳ have been characterized by X-ray diffraction,IRand EPRmethods, Two kinds of phases of Iin solid state have been found.
    Studies on Seed Selection and Kinetic Model of Microorganism Enzymatic Steroid Transformation Using Computer Image Texture Analysis Technique
    WANG Ji-Fen, YANG Kui, LIU Hong, AN Zhong, DUAN Shi-Duo
    1994, 15(5):  750-753. 
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    In this paper we employ Fractal Theory Organisms Full Information Law and Computer Texture Analysis Technique, and systematically investigate the characterization of morphologies of colonies and mycelium during the microorganism fermentation process. We demonstrate that using the fractal dimension characteristics to assist the mould seed selection can significantly improve the efficiency and accuracy. Moreover,we show that the morphology kinetic model and enzymatic activity model developed by us are capable of describing the microorganisms growing and enzymatic transformation process with a good degree of accuracy. When applied to predict the proper time of putting the substrates into the reaction system, the result is found to be in good agreement with the experimental data.
    Ab Initio Studies on Boron and Carbon Clusters of Ih Symmetry(Ⅰ)──Geometries and Stabilities of B32,C2B30 and B32H322-
    ZHANG Ming-Yu, YU Wei-Zhou, LI Xiao-Tian
    1994, 15(5):  754-757. 
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    In this paper,the ab initio calculations are carried out on the geometries,stabilities and reactivities of the boron and carbon clusters with 32 vertices. The optimization calculations show that B32 is the most stable cluster when 12 five-coordinated and 20 six-coordinated borons are not in the same spherical surface.Two kinds of obtained B─Bdistances (R56,R66) verify Lipscomb's a set of empirical values.The calculated results of the electron structure,total energies and the atom populations for B32 and B32H322- indicate that the number of bonding framework orbitals satisfies Wade's rule and that neutral B32H32 is possibly stable,while its symmetry must be lower than Ih.For C2B30the calculation of the bonded energy and the analysis of the frontier orbital characters suggest that the thermal stability of C2B30 is higher and the reactivity of the accepted electron of it is stronger.
    The Relationship Between the Formation of C60 and the Lattice Plane of Graphite(I)
    XIE Zhao-Xiong, LIU Zhao-Yang, LIN Feng-Chen, WANG Chun-Ru, ZHENG Lan-Sun
    1994, 15(5):  758-759. 
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    The high oriented pyrolytic graphite(HOPG) in different orientations, graphite,grassy carbon were ablated by pulsed laser in high vacuum, and their products were recorded in situ by mass spectrometry. The (0001) plane of HOPG yielded mainly C60 and C70 ions.However, the plane vertical to (0001) plane of HOPG produced no fullerence, so did grassy carbon. The products from graphite contained different sizes of carbon cluster including C60 and other fullerences. These results show that the formation of C60 is closely related to the lattice plane of graphite.
    Detection and Application of Dispersion Threshold in Double Component System
    CHEN Yi-Liang, GUO Shi-Ling, CHENG Ai-Zhu
    1994, 15(5):  760-762. 
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    In this article the dispersion of CuO,NiO on the HZSM-5 support was discussed bv XRDmethod;Spontaneous dispersion tendency of CuO is more obvious than that of NiO.Their dispersion degrees are different when proportions of CuO and NiO are different.In case where the proportion is 0.6423,the dispersion threshold is the largest. This threshold 1s 0.12 g CuO/g HZSM-5 which corresponds to the optimum proportion of CuO and NiO.when the catalyst is used to synthesize n-butylamine,
    The Synthesis and Properties of Polyetheretherketoneketone Containing Biphenyl
    YUAN Jng, ZHANG Wan-Jin, NA Hui, JI Xiang-Ling, WANG Jun-Zuo, Wu Zhong-Wen
    1994, 15(5):  763-766. 
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    Poly(aryl ether ketones) are used as matrix resin in advanced high-performancecomposites because of their excellent properties. In this paper, diphenol-PEEKKhas been prepared by copolycondensation of 4,4'-diphenol and 1,4-bis(p-fluorobenzoyl)benzene in the precence of diphenylsulphone. The general properties are studied by IR, DSC, TGA,etc.. The service temperature of diphenol-PEEKKis higher than that of PEEK, and the mechanical properties are as good as those of PEEK. The crystal structure of this polymer is also studied.
    Studies on the Synthesis and Antitumor Activity of Biodegradable Polyphosphamides
    LUO Yi, ZHUO Ren-xi, FAN Chang-Lie
    1994, 15(5):  767-770. 
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    Twelve biodegradable polyphosphamides containing both 5-FUand phosphonoformic acid(or phosphonoacetic acid) ethyl ester were synthesized by condensation of L-lysine 5-FUalkyl(n=3,4,5,6)ester dihydrocmorides with dichloropliosplioric acid ethyl ester,dichlorophosphonoformic acid ethyl ester or dichlorophosphonoacetic acid ethyl ester,respectively,in DMFand in the presence of triethylamine. The drug release tests were studied in different pH media. Antitumor activities of monomer and polymers were tested against human hepatoma Bel-7402 cells in vitro.
    Selective Catalytic Hydrogenation of C＝C in Poly (butadiene-b-methyl Methacrylate)Copolymer
    ZHOU Qing-Ye, ZHANG Bang-Hua, SONG Mou-Dao, LI Chun-Gang, HE Bing-Lin
    1994, 15(5):  771-774. 
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    This paper studies catalytic hydrogenation of C＝C　in poly(butadiene-b-methyl methacrylate) copolymer by using RhCl[P(C6H5)3]3 as the catalyst.The results which come from the IR,NMR,DMA and chemical analysis demonstrate that RhCl[P(C6H5)3]3 is an ef-ficient catalyst in homogeneous catalytic hydrogenation,and the reaction possesses excellent selectivity.The catalyst provides quantitative hydrogenation of C=Cunsaturation without any hydrogenation of the ester functionality. After completely hydrogenated,the weight percentage of unreduced C＝C is less than 0.71%.
    The Effect of Temperature on Sol-Gel Transition in Alginate Solution and the Investigation of Its IR Spectra
    ZHANG Qing-Zhi, ZHENG Hong-He, WANG Zheng-Yu, Mikio Konno, Shozaburo Saito
    1994, 15(5):  775-778. 
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    In this paper, we determined the viscosity and conductivity of 3wt% sodium alginate solution mixed with various quantities of inorganic salt and at different temperatures.Together with IRspectrum, we predicated the structural alternation during the process of sol-gel transition. Aqualitative explanation was suggested on the difference of gelation ability between Cu2+ an Co2+ cations.
    Dynamic Mechanical Behavical Behaviour of Polyethereetherketone/Polyethersulfone Block Copolymers
    CAO Jun-Kui, SU Wen-Cheng, PIAO Ming-Jun, MA ROng-Tang, WU Zhong-Wen
    1994, 15(5):  779-782. 
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    Polvetheretherketone/polyethersulfone block copolymers were prepared by condensation of two oligomers and their dynamic mechanical behaviour were investigated.Two ditstinct relaxation peaks i.e.βand α',were observed in amorphous copolymer samples and it was found that the α' relaxation can be attributed to low temperature crystallization of PEEK.
    Molecular Recognition of a New Kind of Glycolipid with Concanavallin A in Monolayer Membrane
    ZHANG Xi, SHEN Jia-Cong, Rump E., Ringsdorf H.
    1994, 15(5):  783-784. 
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    A new kind of glycolipid bearing p-aminophenyl-α-D-mannopyranoside was synthesized and the direct visual observation of sulforhodamine-labeled concanavallin Abound to the glycolipid monolayer was achieved by using a speciaily designed miniaturized Langmuir trough On the stage of fluorescence microscopy. The glycolipid was spread at a gas phase,and concanavallin Awas injected into the subphase. After incubation for 20 min in 20℃,niany large regular concanavallin Adomains(μm level) were observed for the first time. No regular protein domain was found when the dead concanavallin Ainjected,this indicates that the specific interaction between glycolipid and the protein is responsible for the formation of protein domains.
    A Study of Polymerization of THF with Ch3Cosbcl6 as Catalyst
    LI Fang-Xing, WANG Hong-Jun, MA Ke-Qin
    1994, 15(5):  785-787. 
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    In this paper,a synthetic method of PTHFwith CH3COSbCl6 as catalyst was introduced and the mechanism and kinetic behaviour of polymerization of THFwere discussed in detail. It was found that the concentration of living centre rose continuously in the THFpolymerization,The time of the living centre concentration getting to maximum is 30,20 and 6.5 min at 7℃, 15℃ and 22℃ respectively, then the mumber of living centre begin to reduce. The phenomenon which small amount of water leads to the reduction of living centre has been explained in the relevant report[7]. We think that the trace of water can kill part of living centre, but the hydroxyl will be produced .So the number of the living centre calculated from hydroxyl value can not be influenced,the phenomenon was explained in detail in this paper. The polymerization temperature has a great influence on the polymerization rate constants. The apparent rate constants of the polymerization are 7.90×10-3,14.23× 10-3 and 23.35×10-3 L/(mol·s)respectively at 7, 15 and 22℃.
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