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Table of Content

    24 December 1994, Volume 15 Issue 12
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    Articles
    The Diffusion of Element Cu in Bronze Powder Corrosion─The Key Action of CuCl
    FAN Chong-Zheng, Suzuki Minoru, Inoue Miyoshi, Abe Tadahiro
    1994, 15(12):  1737-1741. 
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    Methods of SEM, EPM, Micro-XRDand XFSare employed to detect the composition and structure of micro-regions in a piece of sereously corroded bronze mirror which was made in the East-Han Dynasty of China. The analysis of section indicates that:(1) the segregation of the bronze alloy during casting is the internal reason of its electro-chemical corrosion; (2) the copper corrosion forms step by step; (3) element Cl corrodes the alloy from the surface to the deep part of the matrix; (4) during corroding element Cu diffuses from the internal alloy to outside. In the present work, the process of chemical reactions at each stage of bronze corrosion is investigated, and simulated experiments are performed. The theory of phase-equilibrium, the principle of electro-chemical corrosion and the chemical thermodynamics are applied. The results of the work provide some reference for the corrosion of alloyes, and for the protection of the ancient bronze relics.
    Stereoselectivity in Chiral Complex Tris(phenanthroline) Iron (Ⅱ)Binding to DNA
    YANG Pin, JIN Lan, YANG Bin-Sheng
    1994, 15(12):  1742-1745. 
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    The chiral complexes tris (phenanthroline) iron (Ⅱ) were synthesized. The structures of the complexes were determined by IR, UV, EXAFS, CD. The binding of the complexes to calf thymus DNAwas studied by spectral methods. Hypochromism and enhancement of luminescence accompany DNAbinding and the binding show the characteristic of intercalation. The enhancement of luminescence seen for △ isomer in the presence of DNAis greater than that for ∧ isomer. The luminescence quenchng produced by [Fe(CN)6]4- for △ isomer in the presence of DNAis smaller than that for Aisomer. It means that △isomer binds preferentially to B-DNA.
    Synthesis and Characterization of Complexes 1,2-Bis(1'-phenyl-3'-methyl-5'-oxopyrazo-4'-yl)-1,2-phthaldione with Rare Earth Elements
    LIU Yi-Ren, YANG Ru-Dong, LIU Jian-Min
    1994, 15(12):  1746-1749. 
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    Anew ligand 1, 2-bis (1'-phenyl-3'-methyl-5'-oxopyrazol-4'-yl)-1, 2-phthaldione (H2L) and its rare earth complexes were prepared by the reaction of H2L with relative metal nitrate in aqueous solution. The binuclear structures of the complexes are proposed according to the elementary analysis results, molar conductance, IRand 1H NMRspectra.
    Preparation of Rare-Earth (Nd, Pr) (Ⅲ) Bisphthalocyanine Derivatives and NH3-Sensibility of Their LB Films
    ZHANG Yin, CHEN Wen-Qi, SHEN Qi, LIANG Bing-Jie
    1994, 15(12):  1750-1753. 
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    In this paper, Nd(Ⅲ) -octa-4-(tetrahydrofurfuroxy) phthalocyanine (A), Nd(Ⅲ)-octa-4-(β-naphthoxy)phthalocyanine (B), Nd(Ⅲ)-octa-4-(2, 4-di-t-pentylphenoxy) phthalocyanine (C) and Pr(Ⅲ)-octa-4-(2, 4-di-t-pentylphenoxy) phthalocyanine(D) were synthesized and characterized by elementary analysis, IR, 1H NMR, UV-Vis spectra. It is indicated that most of them were monomeric molecules in CHCl3 solution. The thermostability order was B >C～D>A. Four kinds of compounds have good film-forming ability.The LBfilms of ADdeposited on gold comb electrode by the LBtechniques according to the Z-type. The gassensibility of LBfilms was determined. The results showed that the films have good sensibility and selectivity for the vapor of NH3. And then the Nd(Ⅲ)-octa-4-(tetrahydrofurfuroxy) phthalocyanine(A) has the best gas-sensibility for the vapor of NH3 comparable with copper (Ⅱ) phthalocyanine.
    Investigation on Interaction of Pt and L Zeolite Using Probe Reaction and in situ FTIR
    DONG Jia-Lu, ZHU Jian-Hua, XU Qin-Hua, ZHANG Jie, LIU Da-Zhuang
    1994, 15(12):  1754-1756. 
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    The Pt dispersed on acidic HLzeolite exhibited "electronic deficiency" and did not show an obvious dehydrogenation activity in isopropanol decomposition, but enhanced the conversion of isopropanol to form H2O and propene through the protection of the acid sites on zeolite against deactivation by carbonaceous overlayers. Pt on KLbasic zeolite, however, exhibited some electron rich and high dehydrogenation activity in isopropanol decomposition.Besides, Pt/ KLwas very sensitive to thiophene poison in the reactions. During the process of pretreatment and reaction, the Pt in the mixture of (Pt/KL+HL) migrated from KLto HL, resulting in that the catalytic properties of the mixture are similar as that of Pt/HLin decomposition of isopropanol. It was proved that there was an obvious interaction between Pt and Lzeolites. The Pt supported was easier to become " electronic deficiency" than to be "electronic rich", which meant that the interaction of Pt with acidic sites was stronger than that of Pt with basic sites because of the metallicity of Pt which can be electronic donor easily but to be the electronic accepter difficultly.
    Amperometric Mediated Biosensor Based on Tetrathiafulvalene as Electron Shuttle Between Glucose Oxidase and Glassy Carbon
    LIU Hai-Ying, LEI Cheng-Hong, DENG Jia-Qi
    1994, 15(12):  1757-1760. 
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    Amperometric mediated biosensor for glucose has been developed by using aqueous Nafion to immobilize glucose oxidase on Nafion-TTFmodlfied glassy carbon. It is further coated by Nafion, a perfluorosulphonated ion-exchange polymer. Nafion coating is not detrimental to the enzyme but to forestall electrochemically active anionic interferences such as ascorbate and urate from reaching the electrode.The polymer coating also avoids tetrathiafulvalene's leaking and keeps the biosensor from fouling agents. For the first time it has been experimentally proved that both TTF+ and TTF2+ can oxidise FADH2 of glucose oxidase. The biosensor responds rapidly to glucose in less than20 seconds and it's calibration curve is linear from 3.0×10-4 to 1.0×10-2 mol/L.
    The Effect of the Physicochemical Properties of GDX Resin and Dioxane on the Performance of Adsorption and Elution for Trace Phenols from Water
    BAO Nan, GAO Lian-Cun, WANG Ji-Shun, WANG Shu-Ren
    1994, 15(12):  1761-1765. 
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    GDX-502 resin, commercially availabe in China, was an excellent adsorbent and dioxane was an excellent eluant for trace phenols in water. In this paper, the relationship between the physicochemical properties of GDXresins and the adsorption characteristics, the physicochemical properties of dioxane and the elution characteristics were investigated. Adsorption-desorption mechanism was discussed briefly by means of IR, Raman and 1H NMRspectra. The pore parameters of GDXresins were determined by mercury porosimeter.It would be raised for concentration efficiency when the dry resins were treated by a series of solvents under the experiment conditions.
    Determination of Ultfa-trace Amounts of Molybdenum in Seawater by Flow Injection On-line Preconcentration Graphite Furnace Atomic Absorption Spectrometry
    YIN Xue-Feng, LIU Mei
    1994, 15(12):  1766-1769. 
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    Amethod for determination of ultra-trace amounts of molybdenum in seawater by flow injection on-line sorbent extraction preconcentration coupled with GFAASis described.An approach for introducting only the most concentrated fraction of the eluate into the graphite tube while discarding the rest was investigated. The experimental parameters of the FI-GFAASwere optimized. If miniflow (50 mL/min) in atomisation step was used, the memory effect in the determination of molybdenum by graphite furnace could be removed. By using the preheating step in furnace temperature program, diffusion losses of molybdnum ethanol solution could be prevented. On-line chelation of molybdenum with dithiocarbamate (NaDDTC) and sorption of the complex on C18 sorbent packed in a micro column ensure high group selectivity and enrichment. The closed nature of flow system reduced the risk of contamination significantly. The enrichment factor was 13. 3 using sample loading volume of only 1. 35 mL, detection limit achieved was 0.027μg/L. Results obtained for seawater and riverwater standards agreed well with certified values with a good precision.
    Enzyme-Amplified Lanthanide Luminescence Spectrometry─Studies on Horseradish Peroxidase-Terbium-p-Hydroxybenzoic Acid System and Its Application to the Determination of Horseradish Peroxidase and Tuberculosis Antibody
    XIE Jian-Wei, YAN Yuan, PENG Xue-Jun, XU Jin-Gou, CHEN Guo-Zhen
    1994, 15(12):  1770-1771. 
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    Enzyme-amplified lanthanide luminescence (EALL)is a new method which has been recently developed for enzymatically amplified signal detection in ultrasensitive bioanalytical assays where an enzyme is used as label or analysed by itself. In the paper, Horseradish peroxidase (HRP)-Terbium-p-hydroxybenzoic acid system has been studied.The EALLmethod has also been demonstrated for the detection of HRPand tuberculosis antibody.
    Investigations on Nanometer-sized Ultramicroelectrodes (Ⅳ) ─Fabrication, Characterization of Gold Cylinder Ultramicroelectrodes
    ZHANG Xue-Ji, WAN Qi-Jin, ZHANG Wu-Ming, ZHOU Xing-Yao
    1994, 15(12):  1772-1774. 
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    Anovel method is described for construction of nanometer-sized gold ultramicroelectrodes using gold fiber etched by ion beam. The electrodes with tip as small as 30 nanometer have been fabricated and characterized by cyclic voltammetry, scanning electron microscopy and chronoamperommetry. The results have shown that fabrication of the electrodes is successful. Moreover, the electrodes can be constructed in a desired size regime. The experiments suggest that the electrodes can be applied in scanning tunelling microscopy electrochemistry, for microvoltammetry in a ultramicroenvironment such as membrane hole with diameter as small as 10μm.
    Neural Networks Used in Chromatography (Ⅰ)─prediction of GC Retention Parameters
    LI Zhi-Liang, O. Yaegashi, LIANG Ben-Xi, SHI Le-Ming
    1994, 15(12):  1775-1777. 
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    Neural networks algorithm was applied to chromatography. The relationship between GCretention parameters and induction effect I, hydrophobic index lgP, molar refractivity MRand molecular connection 1χ was studied by using the modified backpropagation (MBP) neural networks. The GCretention indices of alphatic amines, alcohols, acids and esters were estimated and predicted with relative error less than10%. The neural network method behaved as a good modelling technique for predicting GCretention parameters and might therefore be regarded as a powerful chemometric method.
    Investigation on Electrochemical Behavior of Cu-Zn Superoxide Dismutase
    HAN Ji-Lin, CHEN Hong-Yuan, QIAN Wen, JIN Sheng-Hao
    1994, 15(12):  1778-1780. 
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    The superoxide radical ion O2－, intermediate in the reduction of molecular oxygen, is directly or indirectly involved in a series of biochemical reactions and biological phenomena such as lipid peroxidation, enzymatic hydroxylation, bacteralkilling. An overproduction of superoxide radicals is considered as the origin of some inflammator diseases. Superoxide dismutase (SOD) which has a high specific activity for dismutation of superoxide radicals, O2－, might play a significant, even vital, role in protecting the organism against damaging effects of the superoxide radical. In this paper, Cu-Zn-SODwas firstly studied by kinds of electroanalytical methods such as DCP, NPP, ACPand CV. DCpolarogram of SODin phosphate buffer solution ( pH7.0) shows two waves, whose half-wave potentials are of-0.63 Vand-1.03 V, respectively, in the potential range of-0.3 Vto-1.3V.The diffusion coefficient of SODobtained by Ilkoviv equation is 1.7×10-6cm2/s (25℃). The electrode reaction corresponding to the wave at -0.63 Vis reversible. There are no current response observed at the conventional solid electrode such as glass carbon electrode, graphite electrode and platinum electrode.
    Studies on Mixed Trialkyltin Derivatives (Ⅱ)─Preparation, Characterization and Biological Activities of Butyl-dicyclohexyltin Carboxylates
    YANG ZHi-Qiang, XIE Qing-Lan, ZHOU Xiu-Zhong
    1994, 15(12):  1781-1786. 
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    Twenty-one butyldicyclohexyltin carboxylates were prepared and their structures were characterized through IR, NMR(1H, 13C, 119Sn) and MS. For the arylcarboxylates, there is a good linear relationship between the chemical shift of 119Sn and the Hammett constant of the substituent.The results of the biological test showed that the compounds have a good acaricidal activity.
    Studies on Condensed Heterocyclic Compounds (XVI)─Synthesis of 1-Aryl-1, 2, 3-triazolo[4,5-e] pyrimidineone and Piperidine or Azacyclooctane [1,2-b] pyrimidineone Compounds
    ZHANG Zi-Yi, LIU Ying, CHEN Mao-Qi, YANG Shi-Yan
    1994, 15(12):  1787-1791. 
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    For the purpose of studying the relationship between molecular structures and biological activies of condensed heterocyclic compounds as a part of our recent progress, a series of new heterocyclic derivatives, 5H-1-aryl-1, 2, 3-triazolo[4, 5-e] pyrimidine-4-one(2a-c), 5-N-methyl-1-aryl-1, 2, 3-triazolo[4, 5-e]pyrimidine-4-one(3a-c), 1-aryl-4-ethoxycarbonyl-5-uramine-1, 2, 3-triazole(4(a, b)), 5H-1-aryl-1, 2, 3-triazolo[4, 5-e] pyrimidine-4, 6-dione( 5(a, b)), 1-aryl-1, 2, 3-triazolo[4, 5-e]piperidine[1, 2-b]pyrimidine-4-one(6a)and 1-aryl-1, 2, 3-triazo-lo[4, 5-e] azacyclooctane[1, 2-b] pyrimidine-4-one (7a), were prepared by treating l-aryl-4-ethyloxycarbonyl-5-amino-1, 2, 3-triazoles 1 with formamide, chlorosulphonyl isocyanate, lactin respectively. The structures of all compounds were confirmed by elemental analysis, IR, 1H NMRand MS. Their antibacterial activities against B. Subtilis, E. coli, E. aerogenes; S. aureus were observed.
    Synthesis of 2-Chloro/2-methylsulphonyl-5-(2-phenyl-4-quinolyl)-1, 3, 4-oxadiazole Compounds and Their Nucleophilic Displacement
    ZHANG Zi-Yi, FENG Xiao-Ming, YANG Feng-Ke, GUAN Zuo-Wu
    1994, 15(12):  1792-1796. 
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    Substituted compounds of 2-chloro-5-(2-phenyl-4-quinolyl)-1, 3, 4-oxadiazole 3 and 2-methylsulphonyl-5-(2-phenyl-4-quinolyl)-1, 3, 4-oxadiazole 6 have been synthesized and the reactions of 3 and 6 with a variety of nucleophilic reagent, such as, amine, azide and hydrazine were also investigated. 3 has been prepared by the treatment of 2-hydroxy-5-(2-phenyl-4-quinolyl)-1, 3, 4-oxadiazole with PCl5/POCl3. Whereas the 2-methylsulphonyl derivatives 6 has been obtained from 2-mercapto-5-(2-phenyl-4-quinolyl)-1, 3, 4-oxadiazole through methylation and subsequent oxidation with KMnO4.
    Studies on Metal-Metal Bonded Organic Compounds─Synthesis and Characterization of Unsymmetrical Type of η5>-Substituted Cyclopentadienyltricarbonylmolybdenum (Tungsten) Metal-Metal Singly Bonded Compounds
    SONG Li-Cheng, HU Qing-Mei, YAN Chao-Guo, SHEN Jin-Yu
    1994, 15(12):  1797-1801. 
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    Seven new metal-metal singly bonded compounds of the unsymmetrical type η5>-R1>C5H4(CO)3Mo-Mo(CO)3C5H4R2>-η5>(R1>, R2>:C(O)Me, CO2Et), η5>-R1>C5H4(CO)3W-W(CO)3C5H4R2>-η5>-(R1>, R2>:C(O)Me, CO2Et;H, CO2Et) andη5>-R1> C5H4(CO)3Mo-W(CO)3C5H4R2>-η5>(R1>, R2>:C(O)Me, H; Et, C(O)Me; C(O)Me, n-Bu; CO2Me, n-Bu)have been successfully synthesized by oxidative coupling reaction between η5>-R1>C5H4(CO2)2MNa and η5>-R2>C5H4(CO)3MNa(M=Mo, W) and between η5>-R1> C5H4(CO)3MoNa and η5>-R2>C5H4(CO)3WNa in the presence of Fe2(SO4)3/HOAc/H2O reagents. The structures of 1-7 were well characterized by C/Hanalysis, MS, IRand 1H NMRspectroscopy, and the features of this kind of reaction were discussed briefly.
    A New Sesquiterpene from Artemisia Subdigitata
    LI Yu, YANG Li, SHI Yan-Ping
    1994, 15(12):  1802-1803. 
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    Anew sesquiterpene was isolated from the latex of Artemisia subdigitata. On the basis of spectral methods (MS, IR, 1H NMR, 13 NMRand DEPT, 1H-1H COSY, 1H-13 COSYand 1H-13 COLOC), its structure was established.
    Synthesis and Biological Activities of t-Butylcarbonylmethyl Aryloxyacetate Derivatives
    SNI Yan-Nian, LI Shi-Ming, FANG Jian-Xin
    1994, 15(12):  1804-1806. 
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    This paper reports the preparation of thirteen new t-butylcarbonylmethyl aryloxyacetates. The structures of all compounds have been confirmed by elemental analysis, IR, 1H NMRand MSanalysis. The biological test results show that someof these compounds have a good plant growth regulator activity.
    Quantiative Structure-Activity Relationship Between p-Aminobenzoates and Formation Rate of Cytochrome P450 Metabolic Intermediate Complex
    FU Xu-Chun, LIU Zhi-Qiang, JIANG Hui-Di
    1994, 15(12):  1807-1809. 
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    The formation rates (v) of cytochrome P450 metabolic intermediate complexes for twelve p-aminobenzoates with untreated or phenobarbital pretreated rat hepatic microsomes were tested. both Hansch's method and molecular connectivity method were used to establish their quantitative structure-activity relationship equations. The significant parabolic correlations between the logarithm values of the formation rates (lgv) and the logarithm values of octanol/water partition coefficients of the p-aminobenzoates (lgP) or their first-order valence molecular connectivity indexes (1χν) were observed.
    Stereochemical Effects in Mass Spectrometry (ⅩⅤⅢ) ─Detection of Chirality or α-Amino Acids by Reaction Mass Spectrometry
    PAN Yuan-Jiang, ZHAI Jian-Jun, CHEN Yao-Zu
    1994, 15(12):  1810-1811. 
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    It was found that in the fast atom bombardment mass spectra of α-amino acids, when a pair of enantiomers, D-ephedrine and L-pseudoephedrine, were used as the reaction reagents, the relative abundances of characteristic ions formed by the stereoselective reaction between a sample and a reagent of different configurations were different, from which the chirality of α-amino acids could be detected.
    Character Wave Functions in Configuration Interactions
    ZHOU Tai-Jin, LIU Ai-Min
    1994, 15(12):  1812-1816. 
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    The multi-electron configurational functions in complete active space (CAS) are classified and characterized by weight vectors (occupation numbers of orbitals). Each configuration has a given weight vector. Configuration space invariant under molecular point group is called equivalent weight space. The Slater determinants are basis functions in each equivalent weight space. The new concepts of symmetrization operators, character Slater bases, character matrices and character configuration functions, and general generation methods of symmetrization function (eigenfunction of S2 and irreducible representation of molecular point group) are proposed. According to this scheme, the full configurational functions are a sum of these functions obtained by operating the symmetrization operator to character configuration functions, therefore, the physical factors and geometric factors in full configuration functions are completely separated and redundant variance parameters are removed due to symmetry adaptation. The character Slater bases are one-one correspondence with equivalent VBstructure and have a define chemical significance. This method might play an important role in the CItheory and calculations.
    PM3 Study on Geometries, Heats of Formation and Electronic Structures for Nitric Esters
    GONG Xue-Dong, WANG Jian, XIAO He-Ming
    1994, 15(12):  1817-1820. 
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    Geometries, heats of formation and electronic structures of 39 nitric esters were obtained from energy gradient completed optimization by using PM3 SCF-MOmethod. The calculated results were compared with experimental values and AM1 results. Estimation about the calculated results was given.
    Ab Initio Calculations of 3Δ, 3Π, 3Σ+Ni-CO Molecular Clusters
    XU Xin, WANG Nan-Qin, LU Xin, ZHANG Qian-Er
    1994, 15(12):  1821-1824. 
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    Ab initio methods are employed to study the influence of the d-hole position upon the Ni-CObonding mechanism. The calculation results demonstrate that the relative importance of σ-donation and π-backdonation varies with the electronic states of Ni-CO. The electron cloud in σ subspace is more diffuse than that in π subspace, thus the stability of Ni-COis closely related to the electronic repulsion in σ subspace. With the increase of the Ni 4pσ occupation, the stability of Ni-COdecreases. Combinebd with the previous results, a comparison between Ni-COmolecular cluster and NiCO molecule, as well as CO/Ni chemisorption system, is given.
    The Structure and Electronic Spectroscopy of Jahn-Teller Distorted C60－
    TENG Qi-Wen, FENG Ji-Kang, SUN Jia-Zhong
    1994, 15(12):  1825-1829. 
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    The geometry optimization of radical anion C60－ has been performed by INDO series of methods and the D3d symmetry structure has been obtained. It is illustrated that the Jahn-Teller distortion has taken place definitely for C60－ which makes the single bonds shorter, whereas the double bonds longer, and 10 kinds of bonds and 6 types of different atoms formed. On the basis of this geometry, the electronic spectrum of C60－ has been calculated, which is in good agreement with that of experiment. The spectrum has been assigned theoretically. Finally, the geometry, energy, spectrum and the character of reaction of three kinds of symmetries of C60－: D5d, D3d and D2h have been analyzed, compared and summarized.
    Electrochemical Study on Acetylacetone-Tetraphenyl Porphyrin Rare Earth Complexes
    ZHANG Heng-Bin, SUN Shu-Qing, LIU Guo-Fa, LI Shu-Jia
    1994, 15(12):  1830-1833. 
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    Redox properties of acetylacetone-tetra-(p-chlorophenyl) porphyrin rare earth complexes were characterized in dichloromethane or aqueous solution with cyclic voltammetry, and they were compared with those of acetylacetone-tetra-(p-methoxyphenyl) porphyrin rare earth complexes.
    Investigation on the Mechanism of the Preparation of Lead Titanate Fine Powders by Hydrolysis of Alkoxide
    QI Li-Min, MA Ji-Ming, CHENG Hu-Min, ZHAO Zhen-Guo
    1994, 15(12):  1834-1837. 
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    The TG-DTA, XRDand IRtechniques have been used to study the crystallization behavior of lead titanate(PT) fine powders prepared by hydrolysis of alkoxide, and the content of soluble lead in the fine PTpowders has been examined by chemical analysis. The results suggest that the Pb in the PTpowders which has not been crystallized completely exists in two states, i. e. amorphous PbTiO3 and amorphous PbO. When the temperature reaches the crystallization temperature region(430-470℃), the conversion from amorphous PbTiO3 to perovskite phase of PbTiO3 and the reaction between PbOand TiO2 take place simutaneously.
    The Effect of Tetraethylammonium Ion on the Surface Activities and Micelle Formation of Anionic Surfactants and Their Mixtures
    ZHANG Lan-Hui, CAI Zhou-Fu, DING Hui-Jun, ZHAO Guo-Xi
    1994, 15(12):  1838-1842. 
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    Results are presented of the effects of tetraethylammonium ion on the surface activities and micelle formation of anionic surfactants and their mixtures. Tetraethylammonium ion behaves as an inorganic ion when its concentration is low, but is obviously participates in the adsorption and micellization when its concentration gets higher. It seems that a hydrocarbon chain was introduced onto the hydrophobic chain of surfactants. As a result, the surfactants act higher surface acitivties and the mutual phobicity between the fluorocarbon and hydrocarbon surfactants is reduced.
    Experimentally Limiting Ternary Activity Coefficients
    BAO Jian-Bin, ZHOU Qiu-Hong, LI Ang, HAN Shi-Jun
    1994, 15(12):  1843-1844. 
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    The gas stripping method has been used for the determination of limiting ternary activity coefficients. The experimental values can thereafter be used for predicting the whole range vapour-liquid equilibria or liquid-liquid equilibria for a ternary system.
    The Structure and Catalytic Behaviour of Co-Mo-Te System in the Oxidation of tertButyl Alcohol
    WANG Guo-Jia, WU Tong-Hao, YANG Hong-Mao, JIANG Yu-Zi, JI Yu-Shu
    1994, 15(12):  1845-1847. 
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    The Co-Mo-Te system catalysts were prepared and chracterized by IRand XRD.The catalytic behaviour of Co-Mo-Te systems were studied in the tert-butyl alcohol oxidation reaction. The results indicate that the new phases of Co4TeMo3O16 and MoO3 are formed with introducing Te into Co-Mo systems.There exists some relationship between the conversion of tert-butyl alcohol, selectivity of oxidation products (MAL+MAAand Scox) and these new phases.
    Catalytic Properties of Nanosize Ni-B Amorphous Alloy
    YANG Jun, CUI Li-Li, DENG Jing-Fa
    1994, 15(12):  1848-1850. 
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    Nanosize Ni-Bamorphous alloy was prepared by chemical reduction. The diameters of the particles are in the range of 10～20 nm. The surface composition was determined by XPS. Its catalytic hydrogenation activity is higher than that of Raney Ni, because it has more active sites. The nature of the active site is the same for the two samples.The Ni atoms on the surface are the active sites of the hydrogenation, and boron will promote the catalytic activity by forming amorphous structure with nickel to provide more active sites.
    A Study of Cluster Negative Ions Produced by the Laser Ablation of Pb2(Tax, Ru1-x)O6+δ
    JU Xin, YANG Jian-Hong, SHI Chao-Shu, ZHANG Nan, GAO Zhen, KONG Fan-Ao, ZHU Qi-He
    1994, 15(12):  1851-1853. 
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    The properties of formation of cluster negative ions produced by the laser ablation of Pb2(Tax, Ru1-x)O6+δ were investigated in Tandem TOFspectrometer.The varieties of cluster negative ions were exactly identified, and the influence of chemical bonding and the unit of coordination on the formation of cluster ions was qualitively discussed.
    Studies on the Interaction Between the Promoter and the Lysine Residues in Cytochromec
    QU Xiao-Gang, CHOU Ju, ZHOU Cheng-Li, LU Tian-Hong, DONG Shao-Jun
    1994, 15(12):  1854-1855. 
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    The direct electrochemistry and synchronous fluorescence spectrometry of cytochrome c(cyt. c) were investigated when iodide anions were used as a promoter.The direct evidence for the interaction between iodide anions and the positively charged lysine tesidues of cyt. c was obtained, indicating that the electrostatic interaction between cyt. c and promoter was very important for accelerating the electrochemical reaction of cyt. c.
    Effect of iPS-b-iPP Copolymer on Properties and Morphology of iPS/iPP Blends
    XU Guang-Xue, LIN Shang-An
    1994, 15(12):  1856-1860. 
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    The diblock copolymer of isotactic polystyrene and isotactic polypropylene (iPS-b-iPP)was very effective emulsifier for iPS/iPPblend. It was shown that the mechanical properties of iPS-b-iPP/iPS/iPPblend(i.e. lzod impact strength, ultimate elongation and tensile strength at break) dramatically enhanced with the increase of diblock copolymer content. As investigated by DMAand SEM, the characteristic temperature-modulus performance and observed morphology of iPS/iPPblend pair unambiguously supported the interfacial activity of iPS-b-iPPcopolymer as both a dispersant and a "coupling agent". The phase size was significantly reduced, the interfacial adhesion was dramatically increased.
    Studies on Adsorption of the Digoxin with the Macroporous Resin
    LI Li, JI Ang, GUO Xian-Quan, HE Bing-Lin, GAO Chun-Rui, LI Hui-Min, PU Kui
    1994, 15(12):  1861-1865. 
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    Digoxin was selected as digitoxin adsorbed with HA-2 and HA-3 macroporous resins screened from 7 kinds of resins. The physical properties such as specific surface area, pore volume and average pore diameter of the resins were investigated. The factors that affect the adsorption of digoxin are discussed.
    Tuning the Colour of Electroluminescence from Polymer and Dye Complex Films with Driven DC Voltage
    MA Yu-Guang, XUE Shan-Hua, HUANG Jin-Song, TIAN Wen-Jing, LIU Shi-Yong, SHEN Jia-Cong, LIU Xiao-Dong
    1994, 15(12):  1866-1867. 
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    By placing an switching layer between the both light emitting layers, we have achieved the change of electroluminescence spectra from polymer and dye complex films with driven DC voltage. It was found that there are two bands with peak wavelength 455 nm and 520 nm in ELspectra which origined respectively from dye TPBand Alq, and the relative intensity of emission at 455 nm increases with the driven DCvoltage increasing. From the analysis of energy level of materials used, it can be found that there were both potential barrier in PVK/PBD and PBD/Alq interface, and the carriers transferring both potentials barriers at the driven voltage have some difference which made the combination of carriers shift their position when the driven voltage varied. This first discovery provides a new approach for full colour display in device fabrication.
    Recent Development of Liquid Crystal/Polymer Composite Display Materials
    PAN Yi, YANG Yu-Liang
    1994, 15(12):  1868-1874. 
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    This paper is a review of the recent developments in the PDLCelectro-optical display materials field. Especially, a brief introduction about polymer-stabilized cholesteric liquid crystal dispersions (PSCLCD), a new kind of liquid crystal display material, is given in this review.
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