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Table of Content

    24 August 1991, Volume 12 Issue 8
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    Articles
    Synthesis and Axial Coordination Reduction of Tetrakis(4-nitrophenyl) porphyrin Manganese (Ⅲ) Chloride
    Shi Tong-shun, Liu Ben-cai, Wang Qing-min, Ma Tao, Cao Xi-zhang
    1991, 12(8):  995-998. 
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    A kind of porphyrinmaganese (Ⅲ) complex, meso-tetra (4-nitrophenyl) porphyrinman-ganese(Ⅲ) chloride was synthesized The adducts of this porphyrinmanganese (Ⅲ) complex with di atomic molecules such as CO, NOand some organic bases are studied by means of the spectroscopic method. The experimental results show that electron-attracting substituents such as nitro(NO2) on the porphyrin cycle can make the reduction process from Mn(Ⅲ) to Mn(Ⅱ) operate easily. In the presence of trace methanol, NO can reduce this porphyrinmnanganese(Ⅲ) complex.
    Studies on Rare Earth Complexes of Polyaza Polycarboxylic Macrocycle (Ⅰ)--Syntheses and Crystal Structure of Na[Er(DOTA)H2O]·3H2O Complex
    Jin Tian-zhu, Wang Xiao-qing, Xu Guang-xian, Ma Zhe-sheng, Ling Hong
    1991, 12(8):  999-1002. 
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    The complexes, Na[Ln(DOTA)H2O]·3H2Owere synthesized in aqueous solution (Ln = Er, Yb; H4DOTA =1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid).The crystal structure of Na [Er (DOTA) H2O]·3H2O was determined by four-circle X-ray diffractometer. The crystal is orthorhombic with space group P212121The cell parameters are as follows; a=l. 5795(8) nm, 6=1. 5777(8) nm, c=0. 9142(5) nm, V = 2. 278(3) nm3, Z=4.In the crystal the Er(Ⅲ) ion is coordinated by four nitrogen atoms and four oxygen atoms from DOTAand one oxygen atom from water, so that the coordination number of Er(Ⅲ) is nine, taking a monocapped antisquare prism arrangement.
    The Spectral Properties of Nd3+and Ho+Complexes with Bis (phenylsulf inyl) ethane
    Zhang Ruo-hua, Liu Qun-ying
    1991, 12(8):  1003-1006. 
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    The electronic spectra of the Nd3+and Ho3+complexes with diastereoisomeric meso and rac forms of bis(phenylsulfinyl)ethane in the solid state and in the nonaqueous solvent were studied. The electronic spectra in the visible region are analysed. The-spectral parameters(β, b1/2,δ and Ωλ) and oscillator strengths are calculated arid discussed. It is shown that the oscillator strength of the hypersensitive transitions is related to the degree of covalency and the coordinaton number of the complexes.
    Studies on the Extraction of Indium with Di(2-ethylhexyl) monothiophosphoric Acid
    Liu Xing-zhi, Ge Yong-cheng, Song Yu-lin
    1991, 12(8):  1007-1008. 
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    The extraction behavior of indium with di(2-ethylhexyl) monothiophosphoric acid (D2EHMTPA) was studied. Indium in lower acid concentration (0. 005 mol/L) and backextraction in higher acid concentration (3 mol/L) was extracted. The backextraction is easier than that of D2EHPA and D2EHDTPA. The extraction mechanism was shown by IR and.NMR spectra.
    Crystal Structure of α-K3H4[SiW9Al3(H2O)3O37]·7H2O
    Qu Lun-yu, Chen Ya-guang, Peng Jun, Lin Yong-hua, Yu Zuo-long
    1991, 12(8):  1009-1011. 
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    The title complex was obtained from α-SiW9. The crystal structure determination shows that the complex crystallizes in the monoclinic space group P21/α with α= 1. 0996 nm, b=3. 9181nm, c=1. 1987 nm, β= 114. 30°, Dc= 3. 60 g/cm3, Z=4, the final R= 0.081, and the SiW9O34in the complex is A-αa-type tri-lacuna heteropoly anion. Three Al atoms fill into the lacunas linking each other by sharing a corner of the octahedra AlO5(H2O) and with three W2O10by sharing a edge of octahedra, completing a pseudo-Keggin unit. K+ions and crystal water molecules lie in between the anions.
    Studies on Synthesis and Properties of Potassium 9-Molybdenum-3-Vanadosilicate
    Wang En-bo, Shan Yong-kui, Liu Zong-xu, Hu Chang-wen, Liu Jing-fu
    1991, 12(8):  1012-1014. 
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    The potassium 9-molybdenum-3-vanadosilicate was synthesized by the method of the orthogonal design test. The existence of potassium 9-molybdenum-3-vanadosilicate and the dissimilarity between the compounds and other heteropoly compounds in the same series are illustrated by chemical analysis, UVspectrum, IRspectrum, 51VNMR and ESR.
    A New Modified Simplex Optimization Method
    Cai Xiao-jia, Deng Bo, Bai Wen-min
    1991, 12(8):  1015-1017. 
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    Anew modified simplex method of optimization was developed, in which the calculating methods for basical point of reflection, centroid and reflection coefficient were improved. All the points whose comprehensive evaluation values are bigger than the evaluation limit value, namely bL, participate in the calculation of centroid, Pc, whereas those points whose values are smaller than bLparticipate in the calculation for basical point of reflection. Afuzzy comprehensive evaluation function, which contains several parameters, such as chromatographic peak height and area, resolution, noise and analysis time is used as a goal one for evaluating result of simplex optimization in the transference of simplex.
    Studies on the Chemical Equilibrium in the Multicomponent Complex System Containing Surfactant
    Zhang Gui-zhu, Gao Zhi, He Xi-wen, Shi Hui-ming
    1991, 12(8):  1018-1021. 
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    In this work, the spectrometry and conductometry were applied to studying the chemical e-quilibrium of the multicomponent complexes containing surfactant. The optimum concentration of surfactant is relative to both association numbers and stability constants of some components when there is. a maximum productive rate of multicomponent complex in the system. The optimum work condition can be deduced and the surfactant effect can be predicted.
    The Effects of Matrix and Operating Parameters on the Degree of Analyte lonization in ICP-AES
    Sun Da-hai, Zhang Zhan-xia, Mo Guo-ning, He Bai-ling, Zhong Ying, Li Jin-zhi
    1991, 12(8):  1022-1024. 
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    Axial profiles of the degree of ionization of Ca,Cd,Mg,Mn,Zn were determined. The influences of forward power and carrier gas flow on the degree of analyte ionization were observed. Theresults show that the degree of the analyte ionization is not related to the excitation characteristic ofICPdirectly. The influence of matrix elements on the degree of analyte ionization is insignificant.
    Investigation of the Gradient Effect of Column Efficiency on the Gradient Loaded GC Column
    Yun Xi-qin, Kou Deng-min, Li Yan-hong, Lu Xian-yu
    1991, 12(8):  1025-1027. 
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    The study of gradient loaded GCcolumn reveals that there exists not only a gradient effect of retention time but also a gradient effect of column efficiency. The conception is described for the gradient effect of column effifiency and the theoretical equation is derived . The gradient effect can be calculated by computer. The practical result shows that the varying tendency of the gradient effect of column efficiency on experimental value agrees fairly well with that calculated from-the theorem efficiency.
    Research of Flotation Spectrophotometry (Ⅶ)--Studies on Solid Liquid Flotating Separation-Spectrophotometry for Mercury-Iodide-SnCl2-CV-PVA
    Chen Xian-tang, Zhang Sheng-hui, Wang Zhi-keng
    1991, 12(8):  1028-1031. 
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    The present paper reports the flotation spectrophotometry for the formation of mercury-io-dide complex ion with CV-PVA in the presence of SnCl2to form ion associated substance. It is a high sensitive reaction whose e is 3. 26 ×106L/mol ·cm. Mercury in cigarette and nature water was determinated by this method.
    Studies on Polarographic Catalytic Prewaves of Eu(Ⅲ) with α-Naphthaleneacetic Acid
    Jiang Zi-wei, Huang Yun-hui, Gao Xiao-xia
    1991, 12(8):  1032-1035. 
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    A polarographic catalytic prewave of Eu(Ⅲ) with a-naphthaleneacetic acid(NAA) was obtained in a solution of 0. 2 mol/L NH4Ac-0. 05 mol/L K2SO4, pH 7. 0. The concentration of Eu(Ⅲ) from 3. 0 × 10-6to 1. 0 ×10-4mol/L, and that of NAA from 5. 0×10-6to 3. 0× 10-5mol/Lare directly proportional to the peak heights. The mechanism was investigated by several methods, such as linear sweep, cyclic voltammetry, ACpolarography, differential pulse polarography,etc.Wesuggest that NAAbe adsorbed on the surface of mercury electrode, and it complexes with Eu(Ⅲ) diffusing to the surface. The formation of complex on the mercury surface facilitates the reduction of Eu(Ⅲ). In the similar way, we have also obtained the catalytic prewaves of Eu(Ⅲ) with other auxins, such as indole-3-acetic acid (LAA), indole-3-propanoic acid(IPA) and indole-3-butanoic acid (IBA). The formation of polarographic prewaves could be useful to get some information about the additive effect of rare earths with auxins for promoting the growth of plant roots.
    Development and Characterization of a All-integral Microelectrode Array
    B. J. Seddon, Wang Chang-fa, Zhou Xing-yao, Zhao Zao-fan
    1991, 12(8):  1036-1037. 
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    A all-integral microelectrode array has been fabricated by a lithographic technique and was characterized by cyclic voltammetry. In 1mmol/L K3[Fe(CN)6]solution , electrochemical behaviour of the reversible redox species at the array microelectrode has been examined. Its collection efficiency is about 80%. The feedback factor and the shielding factor are 0. 22 and 0. 28, respectively.
    Determination of Trace Amounts of Acetaldehyde Using A Novel Chemiluminescence System
    Lu Xiao-hu, Lu Ming-gang
    1991, 12(8):  1038-1039. 
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    The chemilluminescent reaction of iso-propyl alcohol with ClO--H2O2which is enhanced by acetaldehyde is reported. Based on this chemiluminescent reaction, a new method for the determination of trace acetaldehyde is developed. The detection limit is 1. 0×10-10g/mL acetaldehyde and the linear dynamic range is more than three orders of magnitude. The method has been satisfactorily applied to the determination of trace acetaldehyde in waste water samples of organic chemical plant.
    Simultaneous Determination of Contents of Three Components in Enhanced Sulfisomezol Compound Capsules by Adaptive Kalman Filtering Spectrophotometry
    Guo Yin-long, Xiang Bing-ren, Cai Xiao-lin, An Deng-kui
    1991, 12(8):  1040-1042. 
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    Adaptive Kalman Filtering Spectrophotometry is developed for simultaneous determination of contents of sulfisomezol(SMZ), trimethoprim(TMP) and sulfadiazine(SD) contained in enhaced sulfisomezol compound capsules. The average recoveries(%) were 99. 8, 99. 9 and 100. 0 respectively. The variation coefficients (%) are 1. 5, 1. 7 and 1. 1 respectively. The results of Adaptive Kalman Filter were slightly better than those of original Kalman Filter. Adaptive Kalman Filter may provide a new approach to determine the concentrations from overlapped spectral data without any preliminary chemical separation.
    Enhancing Effect of Surfactants on Atomic Absorption Flame Spectrometry
    Feng Qing-cai, Zheng Si-yun
    1991, 12(8):  1043-1045. 
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    Enhancing effect of ten surfactants on atomic absorption spectrometry for the determination of different metals was studied by using air-ethyne flame . Whether surfactants have enhancing effec is dependent on the degree of atomization of metals in flame, and the enhancement mechanism are discussed.
    The Behavior of GeH4in an Electrically Heated Quartz Tube
    Wang Bin, Shao Ji-cai, Zhu Ming-hua
    1991, 12(8):  1046-1047. 
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    In the electrically heated quartz tube, most of GeH4are directly atomized, i. e. , GeH4(g) →Ge(s). Only a few of GeH4are indirectly atomized, i. e. , GeH,i(g)→Ge(g)→Ge(s). When the temperature of the quartz tube is higher than960K, oxygen in the gas entering the quartz tube will interfere with atomization of GeH4, and the process of atomization is Ge(g) +(1/2)O2(g)→GeO(g).
    The Addition Reaction of Spirophosphoranes Containing P-H Bond
    Liu Lun-zu, Li Guo-wei, Cao Ru-zhen, Zhang Shu-kui
    1991, 12(8):  1048-1051. 
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    The addition reaction of 5-hydro-1, 9-dioxa-4 , 6-diaza-5-phosphaspiro-[4, 4]-nonane 1 with carbon disulfide or isothiocyanates is accompanied by a rearrangement to produce 2-mercaptothia-zoline 2, and 2-substituted aminothiazolines 4 respectively. The mechanism of reaction may involve the addition of 1 and its tautomer 6 to the unsaturated bond.
    Studies on Complex of Amino Acid-Copper by High-Performance Liquid Chromatography with UV-Detection
    Da Shi-Lu, Li Xiao-jia
    1991, 12(8):  1052-1055. 
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    A new reversed-phase liquid chromatographic method with UV-detection for the analysis of amino acid-copper complex without any pretreatment or derivatizatiojn is studied. The mechanism of chromatographic separation and detection is described. The effect of factors such as the concentration of hexanesulfonate, copper ions and buffer as well as pHvalues is discussed. Guidelines are given for optimization of the separation. The analysis of amino acid samples are examined.
    Studies on Acylthioscmicarbazides and Related Heterocyclic Derivatives (XⅦ)--Synthesis of Some l-Arylformyl-4-[4'-(2,2,6,6-Tetramethyl-Piperidine)-l-Oxy]Thioscmicarbazidcs Compounds
    Zhang Zi-yi, Shi Ji-cheng, Zheng Rong-liang, Zhou Yan-chun
    1991, 12(8):  1056-1060. 
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    Twenty one 1-arylformyl-4-[4'-(2, 2, 6, 6-tetramethyl-piperidine)-1-oxy] thiosemicar-bazides were synthesized. Their structures were ascertained. And the characters of IR, MS and ESR spectra were discussed. The results of the preliminary experiment show that compounds(5) possess an inhibiting activity on L7712-Lekemia cell.
    Separation and Quantitation of 5 Drugs of Ephedrines in Urine by Capillary Gas Chromatography
    Cui Kai-rong, Zhou Yi, Zhang Chang-jiu, Yang Ze-yi
    1991, 12(8):  1061-1062. 
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    Capillary gas chromatography is used to separate and detect quantitatively the amount of ephedrine, pseudoephedrine, cathine, norephedrine, and methylephedrine in urine. This method is fit to the detection of ephedrines in doping control.
    Studies on Synthesis and Biological Activity of Caged Bicyclophosphate Compounds
    Shao Rui-lian, Wang Shui-ping, Wang Da-zuo
    1991, 12(8):  1063-1065. 
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    The study on the synthesis and biological activity of caged bicyclophosphate derivatives is one of the active fields in organophosphorus chemistry. Eight novel compounds with the general formula as (I) have been synthesized. Their structures were established by elemental analysis, 1R, 1HNMR and MS, Some of Ishowed a fungicidal activities.
    Synthesis, Characterization and Antifungal Activity of 2,4-Dihydroxybcnzaldehyde Thiosemicarbazone and Their Complexes of Cu(Ⅱ),Zn(Ⅱ),Ni(Ⅱ)and Fe(Ⅱ)
    Zhu Xin-de, Luo Zhi-feng, Wu Zi-shen, Yan Zhen-huan, Wang Cheng-gang
    1991, 12(8):  1066-1068. 
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    2, 4-Dihydroxybenzaldehyde thiosemicarbazone and their complexes of copper (Ⅱ), zinc (Ⅱ), nickel(Ⅱ) and iron(Ⅱ) were synthesized by an improved synthetic method and characterized by elemental analysis, IR, 1HNMR, MS and Mossbauer measurement. The compositions and coordination state of these compounds were established and their antifungal activity and free radical inhibition rate were also tested.
    Studies on Acylthiosemicarbazides and Related Heterocyclic Derivatives (XⅧ)--Syntheses and Antibacterial Activity of 2-Arylamino-5-[5-(3-Pyridyl)-2H-tetrazol-2-ylmethylene)-1,3,4-Thiadiazoles
    Chen Li-min, Wu He-ping, Zhang Zi-yi
    1991, 12(8):  1069-1071. 
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    Syntheses of ten 5-[5-(3-pyridyl)-2H-tetrazol-2-yImethylene]-2-arylamino-1 ,3,4-thiadi-azoles(2a-i) were described with a view to studying their biological properties. The structures of these compounds were characterized by eleme nalysis,IR,1HNMR and MS.
    Studies on Chemical Ingredients of the Floral Absolute Oil of Rose Multiflora.Cathayensis
    Xue Dun-yuan, Li Zhao-lin, Chen Yao-zu
    1991, 12(8):  1072-1074. 
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    Rose multiflora. cathayensis was found to contain eugenol(22. 8%) and Phenylethyl alcohol (18. 1%) as the main components in the floral absolute oil by means of preparative column chromato-graphic isolation and 1HNMR and MSspectrometry. All the 24 components were identified and estimated from the floral absolute oil both by capillary gas chromatography/mass spectrometry and by the Kovats index of the components on the OV-101 liquid phase.
    Quantum Chemistry Sduty on the Molecular Electron Polarizability of Conjugated Polyene
    Huang Zong-hao, Wang Rong-shun, Zhao Cheng-da
    1991, 12(8):  1075-1078. 
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    In this paper, the polarizabilities of the molecular electron and the π-system of the typical isomerides of conjugated polyene were calculated by using the CNDO/2 method with the external elce trie field pertubation. The regularity of variation of the polyene polarizability and the factors influencing the polarizability were discussed on the basis of the calculated results, and the difference between the physico-chemical properties of the foms-isomer and the cis-isomer of hexatriene was explained satisfactorily.
    The Joint Utilization of Two Phase Structure Invariant and Harker Charting Method in Calculating Structure Phase of Cocaine Halogenide
    Zhang Gang, Guo Dong-yao
    1991, 12(8):  1079-1082. 
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    Combining Hauptman's probability formula and Marker charting method, under differentconditions, we calculated the structure phases of small molecules structure--cocaine halogenides andanalyzed the effect of phase precision made by model experiment error, and these results can provide a reference foundation for using real experiment dada to do calculations in the future.
    The Localization Study of Some Chain Hydrocarbons、Cyclic Hydrocarbons and Polyhedral
    Yang Jie, Tian An-min, Yan Guo-sen, Li Qian-shu
    1991, 12(8):  1083-1086. 
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    Localized molecular orbitals(MOs) are derived by Boys method for a series of chain hydrocarbons, cyclic hydrocarbons and polyhedral alkanes (the ab initio calculation was carried out by using GAUSSIAN 80 program with STO-3Gbasis set). The relationship between the molewlar geometries and the bending bond properties. energies and populations of localized MOs was discussed, and the stabilities of some molecules were discussed as well.
    Studies on Conduction Mechanism of Ladder Polyphenothiazine
    Wang Rong-shun, Zhang Jing-ping
    1991, 12(8):  1087-1090. 
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    In order to study the conduction mechanism of ladder polyphenothiazine(PTL), the electronic energy bands of the eigenstate PTLand doped PTLhave been calculated. In the calculation the polymers are treated as quasi-one-dimensional systems. Th?method of EHMO/CO is used. The results of the energy bands near the fermi level and the net charge density of each models are given. It is sug-estted that for the eigenstate PTLneutral solitons are probably the dominant charge carriers, for pron-tonic acid dopant charge solitons or polarons are the most likely contributors to the conductivity., for p-type doping polarons are the dominant charge carriers. It can be prejudged that the higher conductivity of PTLcan be reached by the means of doubte doping.
    A Study on Electronic Structure of Polyhedranes C2nH2nwith Molecular Orbital Method
    Hu Xu-guang, Li Qian-shu
    1991, 12(8):  1091-1094. 
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    In this paper quantum chemistry calculations on polyhedrones C2nH2n(n= 2,3,4,5 and 10) and their skeletons C2are made by INDO method and Edmiston-Ruedenberg localization method. Then their electronic structure, stability and the properties of chemical bonds for the molecules are compared and discussed.
    Measurement and Correlation of Excess Enthalpy fer Binary and Ternary Systems Containing n-Butanol,Ethylacetate,n-Hexane
    Shang Zhi-cai, Lin Rui-sen, Yu Qing-sen
    1991, 12(8):  1095-1098. 
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    Excess enthalpies were measured by an isothermal dilution calorimeter for the binary mixtures of n-hexane + n-butanol, and n-hexane +ethyl acetate at 303. 15 K, 308. 15 K, and for the ternary mixture of n-butanol +ethyl acetate + n-hexane at 303. 15 K, respectively. Amathematical model was employed to correlate the excess enthalpies of binary systems for n-butanol-(-ethyl acetate, n-hexane+n-butano] and n-hexane+ethyl acetate at 303. 15 K. The excess enthalpies of the ternary system presented in this paper are well predicted according to the model. The average deviation between the experimental and predicted values is 6%.
    Preparation of Highly Dispersed Supported Metal Catalysts via Sol vated Metal Atom Impregnation (Ⅶ)--The Structures and Properties of Ni-Cu/SiO2Bimetallic Catalysts
    Wu Shi-hua, Huang Wei-ping, Wang Xu-kun, Liu Shang-yuan
    1991, 12(8):  1099-1102. 
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    Ni-Cu/SiO2catalysts with different compositions were prepared by metal vapor method. XRD, TEM and magnetic measurements showed that Ni-Cu alloy was formed, the composition of the alloy particles were nonuniform and some free Ni and Cu atoms also existed, the metallic particle size depended on the atomic ratios Ni/Cu. As the Cu content increased, the metallic particle size increased and varied between 30-100Å. XPS observations revealed that Ni was in zero, +1, and +2 valence states. Cu mainly existed as metallic Cu and Partly as Cu2O. The results of XPS also show that the surface compositions of these catalysts were different from those of their bulk. In contrast with the surface enrichment in copper generally observed on Ni -Cu catalysts, the surfaces of these catalyst were enriched in nickel. The results of hydrogenation of furfural showed that the activity of bimetallic catalyst with Ni/Cu molar ratio 1 : 1 was greater than those with Ni/Cu2:1 and 3:1, and those of Ni(or Cu) monometallic catalysts.
    Computer Texture Analysis for Surface Image of Phthalic Anhydride Catalyst
    Duan Shi-dou, Chen Hui, Wang Xi, Yang Kui, Wang Ji-fen, Wu Yong
    1991, 12(8):  1103-1104. 
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    The computer image texture analysis technique was used to investigate scanning electron micrographs (SEM) of catalysts. Various surface texture features were carried out. Relationships between these features and other physical and chemical properties of catalyst were studied. The form, change and regularity of catalysts' surface were analysed. This technique would be of avail for the computer-aided design and study of catalysts.
    The Behavior of Light Induced Charges on Ultrafine Particle TiO2Surface
    Li Ping, Jiang Lei, Zou Bing-suo, Wang De-jun, Xiao Liang-zhi, Li Tie-jin
    1991, 12(8):  1105-1106. 
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    This paper describes a study for the behavior of light induced charges on the surface of ul-trafine particle TiO2(UFP-TiO2) by surface photovoltage spectroscopy(SPS). It is found that the SPSresponse of TUP-TiO2is very sensitive to some gases adsorbed. The interaction and the processes of charge transfer between the surface and adsorbate have been discussed.
    The Method of Topological on the Distribution of Electronic Density Based on Semi-empirical SCF-MO Method (Ⅱ)
    Zheng Shi-jun, Cai Xin-hua, Meng Ling-peng, Xu Zhen-feng
    1991, 12(8):  1107-1109. 
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    The topological properties of hydrogen-bond, the bond variation of transition structures on reaction path and the characters of the Laplacian super-surface of electronic density are discussed. The calculated results based on the semi-empirical method in this paper have good linear correlativitic-s with those of ab initio calculation.
    A Quantum Chemistry Study on Surface Photovoltage and Gas Sensitive Properties of TCNQ
    Guo Chun-xiao, Wang De-jun, Jiang Lei
    1991, 12(8):  1110-1112. 
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    It is found that in the visible-ultraviolet region TCNQ has two kinds of SPYpeaks. When CO was adsorpted at the center of benzene ring in the TCNQ, p1peak disappeares and p2slightly decreases because the transition of π→π has been impeded. When O2or NO2was adsorbed at nitrogen atom of terminate group in TCNQ, p2peak decreases or disappeares because the transition for lone pair of nitrogen atom was impeded. The calculation results of quantum chemistry indicate that p1and p2peak are associated with two kinds of different transitions.
    Structure of the Electronic Energy Bands of the Conducting Polymer PPy and the Structural Study of Ppy
    Zhang Jing-ping, Wang Rong-shun
    1991, 12(8):  1113-1115. 
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    The electronic energy bands of four kinds of configurations of the conducting polymer PPy were calculated. In the calculation polymers are treated as quasi-one-dimensional systems, and the method of EHMO/CO is used. The results of the energy bands be near the fermi level are given. The structure of PPy by means of the analysis of electronic energy bands was guessed.
    Infrared Laser Induced Dissociation and Isomerization of Allyl Alcohol
    Lin En-hui, Zhao Xiao-hong, Wang Xue-feng, Zhang Chang-yan
    1991, 12(8):  1116-1118. 
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    The infrared laser induced chemical reaction of allyl alcohol is a multiple pathway reaction with the competition between dissociation and isomerization. The isorrierization proceeds via 1,3-hy-drogen sigmatropic shift in an excited electronic state, principally agreeing with the classical photo-chemically allowed Woodward-Hoffman rule.
    Studies on Spectroelectrochemistry (Ⅲ)--The Oxidation Behaviour of Diethylstilbestrol and the Rearrangement of Electrode Reaction Product on an Optical Thin Layer Gold Minigrid Electrode
    Deng Jia-qi, Deng Zi-feng, Wu Xing-liang
    1991, 12(8):  1119-1121. 
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    In methanol-Britton Robinson Buffer-sodium chloride solution and in the presence of ferro-cence as a catalyst, the electrochemical oxidation of diethylstilbestrol was investigated by the thin layer spectroelectrochemical method at an optical gold minigrid electrode. It is found that diethylstilbestrol is electrooxidized to 4,4'-diethylstilbestrol quinone, then the latter rearranges to Z,Z-dienestrol. The rearrangement rate constant over the range of pH from 6 to 8 was measured by single potential-step chronoabsorptometry.
    X-Ray Diffraction Studies of Pyrolytic Products of Phenol-Formaldehyde Resins
    Xie De-min, Wang Rong-shun, Zhang Xi-yan, Fu Yu-jie, Wang Cun-guo, Zhao Cheng-da, Mu Zhong-cheng
    1991, 12(8):  1122-1125. 
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    X-ray diffraction method has been used to study pristine and doped polyacenic semiconduc-tive materials prepared by pyroiytic treatment of phenol-formaldehyde (PF) and paracresol-formalde-hyde (PCF) resins. The results show that pyroiytic products of PFdisplay a polycrystalline structure and the interlayer distance is shortened with increasing TP. The pristine samples obtined by pyrolysis of PFresin containing ZnCl2in advance are amorphous, ZnCl2plays a role of porous structure formation , increasing specific surface area and the values of dcin all iodine-doped samples are increased in comparison with those of the pristine samples. The pristine samples obtained by pyrolysis of PCF resin show also amorphous structure but the value of dcdoes not change significantly.
    A Study on Number Average Molecular Weight of Xanthan
    Zhang Li-na, Huang Ai-hui, Xu Jing-juan
    1991, 12(8):  1126-1129. 
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    The number average molecular weights Mn and the second virial coefficients A2for six fractions of xanthan sonicated fragments were measured by an improved Bruss membrane osmometer according to dynamic and high speed static osmometry in0.1 mol/Laqueous solution of NaCl, cadoxen and water/cadoxen mixtures at 25℃. The ratio Mn(in 0. 1 mol/L NaCl)/Mn(in cadoxen) was equal nearly to 2. It is concluded that the double-stranded helix and a few bi-or perhaps multi-molecular associates of xanthan coexist in 0. 1 mol/Laqueous NaCl, and dissociate into single random coil chains in pure cadoxen. When the weight fraction Wcadof cadoxen in the mixed solvent was about 0. 6, the double helical structure was almost completely broken to single.
    Studies on the Adsorption of Middle Molecular Substances from the Plasma of Uremic Patients and Severe Burnt Patients in Vitro
    Guo Xian-quan, Yu Zhan-ru, He Dan, Shi Xiu-ping, He Bing-lin, Wu Xiao-bing, Xiao Ying-qing, Wang Tie-dan
    1991, 12(8):  1130-1133. 
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    It was studied that the middle molecular substances (MMS) were removed with macrop-orous resins from the plasma of uremic patients and severe burnt patients in vitro. The MMS were analyzed with Sephadex G15. The simulated plasma-perfusion was carried out. The efficiency of the clearance of the MMS was investigated. The mechanism of adsorption of the MMS by macroporous resins was discussed. It is helpful for finding and preparing a way to treat the patients with hemoperfu-sion.
    Synthesis of Monoesters of Polymaleic Acid with Functional Side Chains
    Zhao Ying-ying, Gao Mang-lai, Li Tie-jin, Tang Xin-yi
    1991, 12(8):  1134-1135. 
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    In this paper seventeen monoesters of polymaleic acid (PMAME) with functional side chains, a new kind of polymeric material, were synthesized by the reaction of alcohol and polymaleic anhydride (PMAN) and characterized by FTIR, 1HNMR, elementary analysis and MO. It is shown that the Mn and of PMAN equals to 1. 1 × 103. The π-A curve was drawn on the surface of water. This curve has a good linear relationship area. Some good LBfilms were prepared on the substrate of CaF2, quartz, n-Si and ITO glass. Through studying the properties of the polymer PMAME, it is clear that these polymers are the ideal polymeric LB film materials.
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