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    24 November 1987, Volume 8 Issue 11
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    Articles
    Studies on the Dispersion State of Silica Hydrosol, Water Glass and Ethyl Silicate Hydrolysate by 29SiNMR Spectrography
    Wang Jinxi, Liu Haicheng, Chen Rongsan, Chen Bing, Li Haizhi
    1987, 8(11):  959-962. 
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    The dispersion state of silica hydrosol, water glass and ethyl silicate hydroly-sate is studied by 29SiNMR spectrography. The results indicate that all silica hydrosols are typical colloidal solution. The state of silica in water glass is more complicated. It is in true solution when the mole ratio of SiO,/Na,O is equal to or less than 2, but colloidal behaviour becomes gradually apparent when the mole ratio is more than 2.The state of silica in the hydrolysate is dependant on the mole ratio of H2O/C2H5O; when the ratio is less than 0.5, the product is poly-exthoxysilicate in the solution and when the ratio is equal to or more than 0.5, the product consists of small particulate colloids and polycyclic silicic acids in the solution.
    Studies on the Complexes of Rare Earths with 2-Phenyl-Quinoline-4-Carboxylic Acid
    Cui Jianzhong, Zeng Zhengzhi, Deng Ruwen
    1987, 8(11):  963-968. 
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    The fifteen complexes of rare earth with 2-phenyl-quinoline-4-carboxylic acid have been prepared. The composition of complexes has been determined as RE(C16H10NO2-)3·H20(RE =Y,La-Nd, Sm-Lu). The IR, UV, H-NMR, TG and DTA, molecular fluorescence spectra, molecular conductance of these complexes in DMF and DMSO, and their solubilities in H2Oand organic solvents of the complexes have also been studied.
    Studies on Ce(Ⅳ) Coordination Compounds with PyNO and 4-PiCNO
    Zhao Jizhou, Zhu Wenxiang, Li Wenxu
    1987, 8(11):  969-971. 
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    Four new coordination compounds of CeL8(NO3)4 and CeL8(ClO4)4(L=PyNO·4-PiCNO)were prepared for the first time.The physical and chemical properties of these new coordination compounds were studied with thermogravity, IR, 1HNMR and conductivity methods.
    The Fluorescence Quenching Method to Determine Ruthenium by Rhodamine 6G
    Shun Jingxuan, Pan Yuchen, Song Yumin
    1987, 8(11):  972-974. 
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    Anew sensitive fluorescence quenching method is proposed on the basis of the ternary complex formed from ruthenium (Ⅲ) and rhodamine 6Gin the presence of thiocyanate. Rhodamine 6G is a fluorescent dye. Its maximum excitation wavelength is 525nm, and its maximum emission wavelength is 551nm. The formation of the ternary complex reduces the fluorescence. Beer's law is obeyed in the concentration range from 0 to 0.7/μg/50ml. The method is valuable in determining the trace of ruthenium in both synthetic and natural samples.
    Paper Absorption Spectrophotometric Determination of Arsenic in Water Through the Reaction of AsH3with HAuCl4
    Zuo Bencheng, Liu Rong, Wang Ximing
    1987, 8(11):  975-977. 
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    A new method for the determination of traccs of arsenic is introduced. The arsenic in the sample solution was reduced to AsH3with zinc and HCl Adisk of paper was impregnated with HAuCl4The reaction of AsH3with HAuCl4give colored fleck (violet-blue), which has a fixed diameter of 8mm. The fleck is then measured with 721 spectrophotometer. Atrace amount of arsenic in water were determined, with Cmin= 1×10-8g/ml and the cofficient of variation is 4%.
    The Enhance of the Sensitivity of Conventional Flame Atomic-Absorption Spectrometry by Slotted Stainless Steel--Determination of Copper and Zinc in Serum
    Sun Shuju, Bing Guide, Zheng Yansheng, Guo Yi
    1987, 8(11):  978-980. 
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    A slotted stainless steel tube when used in air-acetylene flame increses the residence time of atoms in the light path of an atomic-absorption spectrometer, thus increasing the analytical sensitivity. With this technique copper and zinc were determined in serum diluted 1:20. Rapid accurate analyses can be achieved by using continuous aspiration. Use of aqueous standards resulted in recovery for copper and zinc of 92-110.9%. Coefficient of variation of 2.7% and 3.6% respectively.
    The Studies of 1,4-Bis(2-Phenyl-1,3,4-Oxadiazol-5) Benzene and Its Derivatives (Ⅱ)
    Chen Jingshan, Pan Jiaxing, Kao Chenheng
    1987, 8(11):  981-986. 
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    The UV, FLspectra and φF of PDPDP and p-t-BuPDPDPare taken respectively in eighteen solvents. The solvent effect on UV, FLspectra and φF for both compounds are discussed.
    Precise Determination of Crystal Structure of Anemonin
    Ju Yong, Jia ZhongJian, Chu Tse-Tsjng, Zhang Shiwei, Shao Meichen
    1987, 8(11):  987-989. 
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    The crystal of anemonin, C10H8O4, which is colorless and transparent,belongs to orthogonal system with space group D2h15-P21/b21/c 21/α, The unit cell parameters are α= 11.063(4),6 = 11.633(4),c = 13.873(4)Å,Z=8.The diffractometry result shows that the two unsaturated γ-lactone rings are connected to cyclobatane at 1,2 positions in a spire arrangement. It is the same as the result of spectra determination.
    Investigation on a New Model Porous Polymer Bead Used for Water Analysis by Gas Chromatography
    Yu Zhongjian, Long Yicheng
    1987, 8(11):  990-995. 
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    Anew model porous polymer bead based on methyl-acrylate ester-styrene copolymer used as stationary phase for water analysis by GC is presented.Separation and quantitative analysis of water in various organic compounds and inorganic gases were studied. It has been proved that these new products have a lot of better chromatographic behaviors than widely used porous polymer beads such as Chromosorb, Porapak and home made GDX series etc..
    Study of Synthetic Methods on Insect Sex Pheromone Ostrinia Nubilalis
    Chen Jiawei, Jiang Jilong, Huang Jinxia
    1987, 8(11):  996-997. 
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    The synthesis of ostrinia nubilaiis sex pheromone (11-tetradecene-l-ol acetate) was studied. 10-Undecen-1-ol was used as starting material, Wittig reaction was carried out in NaH/DMSO-THF.The result of GC analysis indicates that the ratio of cis- and trans- isomers is corresponding to the requirement of its biological activity.
    The Spectroscopic Study of the Dehydration of 1-Methyl-3, 5-diphenyl-3-hydroxypyrazolidine
    Chang Jianhua, Yang Yunna, Liu Yuanfa
    1987, 8(11):  998-1000. 
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    The reaction of chalcone with methylhydrazine produces a new compound, 1-methyl-3, 5-diphenyl-3-hydroxypyrazoline(Ⅲ).The unstable intermadiate can be dehydrated into pyrazoline. The dehydration process can be monitored by IRand UV, and is shown to be first order with respect to (Ⅲ).The absorption at 1680cm-1in compound (Ⅲ) is assigned to the structure
    The Synthesis of Diisopropenylmetallocene (Sn,Ti)
    Lin Zhanru
    1987, 8(11):  1001-1003. 
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    Organometallic compound containing divalent tin, 1,1 '-diisopropenylstanno-cene(Ⅱ)(1) was prepared by the reaction between cyclopentadienyllithtum and stannous chloride, it is an air-sensititvc compound. 1, 1'-diisopropenyldichlorotita-nocene (2), which is very stable in air, can also be synthesized by the same method. The properties of these two compounds were compared in this paper.
    A Theoretical Study of Ethylene Adsorption on Transition Metal Ni(Ⅲ) Surfaces and Cu(Ⅲ) Surfaces
    Yu Hengtai, Yuan Weifu, Gao Guorong
    1987, 8(11):  1004-1008. 
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    The stable geometries, the bonding energies and the activation energies are calculated for ethylene adsorption on transition metal Ni(111) and Cu(111) surfaces by using EHMO method. The results show that the C-Cbond length, 1 = 1.60Å, the perpendicular distance between the C-Cbond and the metal surface, h = 1.80Å and the bend up angle of the plane HCH, θ=30° for the Ni adsorption) and l= 1.94Å,h=1.70Å and θ=60° for the Cu adsorption. The corresponding bonding energies for two systems are 62.1 and 21.3 kcal/mol, respectively. These results are consistent with the experimental fact. The origins of the different bonding energies are discussed and the origins of the different values for the activition energies are explained by molecular orbital natural correlation.
    Action of Cerium in Catalysts at Oxidation of Methane
    Ji Yushu, Wei Quan, Cui Xianghao
    1987, 8(11):  1009-1011. 
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    Sn-Zr and Sn-Zr-Ce catalysts were selected as formaldehyde formation catalysts and characterized by x-ray diffraction, SPV, X-ray photoelectron spectroscopy and temperatureprogrammed desorption of O8and n-butylamine. The activity yielding formaldehyde depends on cerium and its content. It is found that the addition of cerium lower the bonding energy of Sn, Zr and has influence on acidity of catalysts as well as adsorption of O2, CH4The result obtained from x-ray diffraction shows that cerium exerts action on Sn and Zr.
    The Calculated Method of Quantitative Analysis of DTA Curves
    Duan Xue, Ma Li, Wang Qi, Peng Shaoyi
    1987, 8(11):  1012-1016. 
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    In this paper, a method of quantitatively analyzing DTA curves by two de-mension linear correlation, with which the kinetic parameters are obtained, is put forward according to the reasonable, kinetic model for the chemical reaction with characteristic thermal effect. The characteristics of this method is that some kinetic parameters are obtained by once experiment of DTAand once calculation only.Two kinds of methods of obtaining the data of DTAare illustrated in detail by some examples, and it is put forward that identity of the results obtained by two demension linear correlation with the data from two kinds of calculated methods is used as the criterion whether the kinetic parameters are correct or not.The results are compared with that of other researchers methods.
    Adsorption on Surface of Modified Solids--The Thermal Stability and Adsorbability of the Methylated Silica Gel
    Zhao Zhenguo, Shao Changsheng, Qin Shoufeng, Lin Yao, Lin Zhenkun, Gu Tiren
    1987, 8(11):  1017-1020. 
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    The methylated silica gel has been produced by the reaction between the surface silanql groups and ClSi(CH3)3vapor. The adsorption isotherms of acetic acid from carbon tetrachloride onto silica gel and methylated silica gel heated at various temperatures have been determined at 25℃, and the above mentioned silica gels have been studied by TGand IR. The results indicate:(1) the adsorption of acetic acid from carbon tetrachloride onto methylated silica gel decreased greatly, probably due to the concentration of the free hydroxyl groups for methylated silica gel decreased greatly as the IRshows, (2) As the surface methyl groups were destroyed at 500℃, the adsorption ability was restored when the methylated silica gel treated at>500℃; (3) after the methylated silica gel treated at high temperature, the adsorption ability was restored owing to that the surface free hydroxyl groups were reproduced.
    The Complementary Relation and the Particle-Hole Symmetry in the Spectrum of Rare Earth Ions
    Zeng Zonghao
    1987, 8(11):  1021-1025. 
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    The particle-hole transformation is expressed explicitly in a unitary operator and used to analyze the complementary relation appropriate for any representation of a finit-basis model system. The results are checked by the particle-hole symmetry emerging from the spectrum of the trivalent lanthanides.
    The Mixed Adsorption of PVP and SDS at Solid/Liquid Interface
    Ma liming
    1987, 8(11):  1026-1030. 
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    The adsorption of SDS and PVP from their mixed solutions onto TiO2and carbon black has been determined exprimentally. On the surface of TiO2, the adsorption of SDS and PVP shows synergistic effects at low SDSconcentrations and antagonistic effects at high SDS concentrations. On the surface of carbon black, the adsorption of PVP and SDS shows to be merely competitive. The experimental results were discussed in terms of the complex formation between PVP and SDS, as well as by the polarity of the solid surfaces.
    Renormalization of Lattice Model and Polycondenzation Reaction
    Li Zesheng
    1987, 8(11):  1031-1032. 
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    In this paper, the renormalization of lattice model of percolation theory, due to Reynolds et al., is extended to the polycondenzation reaction of Aa-Bbtype. The critical exponents and the gel points are obtained to give a modifi-cation of those quantities of polymer statistics.
    Electrodeposition of Metals in Fluidized Bed
    Yan Guifan, He Xiude, Zhang Yunbi
    1987, 8(11):  1033-1034. 
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    A fludized cathode was employed to treat waste water containg copper in which the electrodeposit copper concentration were in 0-5kg/m3range and the waste water was acidified to pH≤1. 5.Superficial current densities were 280A/m2, while the copper was deposited about 0.12 kg per hour. Current efficiency could be over 93%, and power consumption per kilogram of copper deposited was 2.7-3.0 kW·h. It has both benefit public and economic.
    Instrument of Isobaric Method and Determination of the Activity of K4P2O7
    Wu Dingquan, Sun Mingxian, Xie Yunfeng, Qu Songsheng
    1987, 8(11):  1035-1037. 
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    A simple instrument for measuring activity coefficients and osmotic coefficients of electrolytic solution was installed by the isobaric principle. Using the method of double standard solution, activity coefficients and osmotic coefficients of K4P2O7aqueous solution were determined.The results are in close agreement with literature value.
    Stabilization of Polyacetylene Films
    Yang Mujie, Yu Xiaochun, Liu Ming, Shen Zhiquan
    1987, 8(11):  1038-1043. 
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    From a comparison of several antioxidants(AM,RD,Hand 264), AMis a powerful antioxidant which can be added into polyacetylene(PA). The kinetics of oxidation and isomerization of PA, PA/SBR, PA/AM, and PA/SBR/AM films have been established by oxidation-weight gain and infrared spectro-photometric analyses. Oxidation of all films is a first-order process comprised of one or two distinct regions. The induction period of oxidation for PA/SBR/AM film is the longest of all films cis-trans isomerization of PAfilms also shows two or three first-order kinetic regions. The antioxidation and anti-isomerization ability of various PAfilms exposed to air at 25℃ decreased in the following order:PA/SBR/AM>PA/AM>PA /SBR>PA. The addition of AMhas no influence on the conductivity possessed by doping PA. It is of significance for use of PAin industry.
    Synthesis of Ultraviolet Cured Castor Oil Polyurethane Network
    Geng Kuishi, Chen Qingmin, Gu Min, Yu Xuehai
    1987, 8(11):  1044-1049. 
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    A series of castor oil-urethane acrylate prepolymer was synthesized by reacting castor oil with toluene diisocyanate hydroxyethyl methacrylate adducts in different ratio.The oligomers were cured by ultraviolet radiation in the presence of different reactive diluents and photoinitiators, All of the cured samples were transparent with fairly good mechanical strength.
    The Investigation of Electric Conductivity for the Poly-Aniline Complexes Under High Pressure
    Xu Dapeng, Cui Shuojing, Su Wenhui, Wang Fusong, Wang Shenglong
    1987, 8(11):  1050-1052. 
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    The electric conductivity for the poly-aniline with large conjugated π-bonds under high pressure was studied. Results show that a minimum of electric resistance-pressure curve for the PA-H+occurs at p = 35kbar. Consequently, the PA-H+may be used as a pressure-calibration material of p= 35kbar.At various pressure conditions, the voltage-current curves are non-linear.
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