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Table of Content

    24 July 1991, Volume 12 Issue 7
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    Articles
    Studies on Binary and Ternary Complex of Alanine with Rare Earth Ions by pH Potentiometric Method
    Deng Ru-wen, Wu Ji-gui, Zhu Yuan-Cheng
    1991, 12(7):  853-856. 
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    The binary and ternary stability constants of Ala-Ln, Glu-Ln and Ala-Glu-Ln(Ala=L-alanine, Glu = L-glutamic acid, Ln=Ce, Pr, Nd, Y) were determined by pHpotentiometric method under the physiological condition(37℃,I = 150 mmol/L NaCl) and carbon dioxide was freed by nitrogen gas. The glass electrode was selected and calibrated by program MAGEC and potentiometric data were treated with MINIQUAD-82A. The compositions of complex species in the equilibrium were ascertained by selection of different chemical models and then the distribution curves were obtained by using program COMPLEX and GRAPHIC. The results show the order of the relative stabilities of the complexes in terms of trivalent metal ions: Ce<Pr<CNd<Y. In addition, the ternary complex may exist in a large pHrange.
    The Interaction of cis-Dichlorodiammineplatinum(Ⅱ) with Proteins of Erythrocyte Membranes
    Chen Bao-wei, Wang Kui
    1991, 12(7):  857-860. 
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    The interaction of DDPwith proteins of erythrocyte membrane was studied. When DDPwas incubated with membranes for 24 h at 37℃, the bound DDPcontent per mg membrane proteins was 0. 11 μmol. The distribution and polymeric form of membrane proteins were investigated by SDS-PAGE method, DDP made band 1,2(spectrin) polymerize. The distribution of DDPon membrane proteins was determined by flameless atomic absorption spectroscopy, all the membrane proteins bind with DDP. It was observed that DDP decreased the sulfhydryl content of membranes. Sulfhydryl groups are one of binding sites for DDP. DDP can cause change of S/W in ESRspectrum of maleimide labeled erythrocyte membranes. This indicates that DDP affects the conformation of membrane proteins. These phenomena support our postulation that membrane proteins are the target of DDPin cell membranes.
    One-Step Synthesis of Ternary Divalent Rare Earth Iodides and Their Properties and Structures
    Luo Shi-min, Zhao Xin-hua, Wang Xiao-dong, Wang Shi-hua
    1991, 12(7):  861-863. 
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    A novel method for the synthesis of ternary divalent rare earth iodides is reported. This method has a number of advantages. Among them are convenience in operation, less time-cost, and avoiding separately preparing the air-and moisture-sensitive REI3or REI2compounds. It is successful in synthesis of special divalent iodides which is difficult to be separated from the tervalent ones formed concomitantly. By using this method RbTml3, KTmI3, Cs2TmI4, TlSm2I5and KSm2I5, were synthesized. Their properties and structures were also determined. The structures of RbTml3and KTmI3belong to orthorhombic system, α=0. 8404 nm, 6= 1. 746 nm, c=1. 1797 nm, and α=0. 8057 nm, 6 = 1. 712 nm, c=1. 1137 nm,respectively. Space group is Pmmm. TlSm2I5is monoclinic system and α= 1. 002 nm, 6=0. 8910 nm, c=1. 4165 nm,β=90. 99. It is isomorphous with NH4Pb2Cls, space group P21/c. Cs2TmI4shows tetragonal system and α=0. 8967 nm, c=1.1207 nm. Its space group might be assigned to be P4/mmm.
    Studies on Rare Earth Complexes of Mixed-Ligands Containing [Et4NB12H11NHCOCH2CONH2]-and bipyO2
    Hu Pei-zhi, Zhang Lun, Wu Hong-bin, Wang Feng-zhen
    1991, 12(7):  864-868. 
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    Mono-substituted amide derivative of [Et4N]2B12H12, [Et4N]2B12H11NHCOCH2CONH2·([Et4N]2BN), was obtained from acid-catalyzed reaction between [Et4N]2B12H12and malononjtrile, followed by hydrolysis. The derivative reacts with lanthanide chlorides and 2, 2'-bipyridine-N,N'-dioxide (bipyO2) to produce 7 novel mixed-ligand rare earth (Ⅲ) complexes with the formula Ln(bipyO2)4(Et4NBN)3, where Ln = La, Nd, Sm, Gd, Dy, Ho and Er. These complexes were characterized by elemental analysis, IR, UV, 1HNMR, ESRand molar conductivities. The thermal properties of the ligands and the complexes were investigated by TG-DTA.
    Crystal and Molecular Structure of Copper (Ⅱ) Dimeric Complex of S-methyl-β-N-(pyridine N-oxide-2-ylmethylidene) dithiocarbazate with Acetonitrile
    Yu Kai-bei, Zhou Zhong-yuan, Gou Shao-hua, You Xiao-zeng, Xu Zheng
    1991, 12(7):  869-871. 
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    The crystal and molecular structure of copper(Ⅱ) dimeric. complex {abbreviated as [CuL (CH3CN)]2(ClO4)2} of S-methyl- β-N-(puridine-N-2-ylmethylidene)dithiocarbazate with ace-tonitrile was determined by X-ray diffraction. The complex crystallizes in the monclinic system space group p21/n,a=7.685(2)Å，b=20. 160(6)Å,c=10.847(5)Å,β=107.89(3),Z=2,Dc=1.788g/cm3,F(000)=835.8,μ=18.17cm-1,R=0.057.Each Cu(Ⅱ)ion in the complex is in a distorted square pyramidal environment of coordination.
    New Method for Measurement of Differential Capacity and the Effect of Halogenide Adsorption on Oscillopolarogram
    Qi Hong, Gao Hong(H. Kao)
    1991, 12(7):  872-874. 
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    A new method of measuring the differential capacity is presented. This method based on the AC Oscillopolarogram and the micro computer is very suitable to study the mechanism of rapidchemical reaction and any other temporary process. The method has been successfully applied to the determination of the zero charge potential and the effect of ion adsorption to Oscillopolarogram.
    Digital Simulation of Cyclic Voltammetry for Reversible,Quasi-Reversible and Irreversible Surface Reaction
    Wang Chuan, Chen Xiao-ming, Hei Pei-xin, Jin Wen-rui
    1991, 12(7):  875-878. 
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    In this paper, a digital model for surface voltammetry is built, the current-potential curve for various kinetic situations are given, the influence of the kinetic parameter to the current function and the methods of determining the kinetic parameters are also discussed.
    Investigations on if-E Curve in Cyclic Derivative Chronopotentiometry (Ⅰ)--Differential Instrument Utilizing Twin Electrolytic Cells
    Shen Xue-ming, Chen Hong-yuan, Gao Hong(H. Kao)
    1991, 12(7):  879-881. 
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    To improve the sensitivity of cyclic derivative chronopotentiometry, the instrument is constructed by using two electrolytic cells, the measuring cell and the blank cell, to cancel most of the charging current of the electrical double layer. if-Ecurve is obtained and used in analysis in place of dE/dt-Ecurve.
    Investigations of if-E Curve in Cyclic Derivative Chronopotentiometry (Ⅱ)--Fundamental Theoretical Equations of if-E Curves
    Shen Xue-ming, Chen Hong-yuan, Gao Hong(H. Kao)
    1991, 12(7):  882-885. 
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    The fundamental theoretical equations of if-Ecurves were derived by the operational impedance method. The electrode processes which involve diffusion, electrode reaction and adsorption are discussed.
    The Chemiluminescence of the Oxidization of p-Aminobenzene Sulfonic Acid and Its Application--Determination of Trace Amounts of Cobalt
    Lu Xiao-hu, Lu Ming-gang
    1991, 12(7):  886-889. 
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    The present paper contains the reaction of reagent p-aminobenzene sulfonic acid with hydrogen peroxide in the presence of cobalt (Ⅱ) as a catalyst in an alkaline solution to produce chemiluminescence. The chemiluminescence spectrum was recorded with a WP4optical spectrophotometer, which shows that the maximum emission wavelength is 445 nm. Based on the catalysis of cobalt ions, the chemiluminescent method for the determination of trace.cobalt was established. The concentration range of linear response is 1.0×10-11g/mLto 5.0×10-7g/mL, the detection limit is 0. 01 ng/mL Co2+, and the method has a good selectivity. Having determined and studied the UV, IRand fluorescence spectra of the product of the chemiluminescence reaction and some reaction reagents, we discussed the mechanism of this chemiluminescence reaction. In addition, the effect of quenching on the chemiluminescence system was discussed briefly.
    Kalman Filtering of Experimental Data of Neopolarography
    Wang Yao-guang, Xu Rong-rong
    1991, 12(7):  890-893. 
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    The 1 :n+2 Kalman filter applied to the experimental data of neopolarography is presented in this paper. The program of it is simple, fast when executed and it doesn't occupy much of memory space. It filters the random noise from the signal and separates the capacitive current from the faradaic current effectively at the same time. The performance of 1 : 3 Kalman filter was evaluated under the controlled conditions. An experimental evaluation of 1 : 3 Kalman filter is presented as applied to the analysis of trace metal Cd(Ⅱ) by staircase sweep neopolarography. The method has been verified further by the application of the method to the staircase sweep neopolarography of Tl (Ⅰ), Pb (Ⅱ) and In (Ⅲ) ions. It can be seen that Kalman filter smoothing is particularly powerful in the processing of experimental data of neopolarography.
    Synergistic Luminescence Effect and Its Analytical Application
    Hu Ji-ming, Chen Guan-quan, Zeng Yun-e
    1991, 12(7):  894-896. 
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    A new sensitized fluorescence phenomenon was observed by adding some of metal ions to Eu (Sm)-DBM-CPB or Eu(Sm)-TTA-Phen-Triton X-100 system, which is known as a synergistic luminescence effect. The synergistic luminescence effect and its analytical application were studied using laser-induced fluorimetry. The influence of the chemical properties of rare earth ions on the synergistic luminescent effects of above systems is reported. The synergistic luminescence systems can be used for the determination of ultratrace amounts of europium and samarium. Results are satisfactory for the determination of trace europium and samarium in highly pure rare earth oxides and synthetic samples.
    Preparation of 2-Thienyl Carboxylic Acids via 1,2-Thienyl Migration
    Wang Jian-hua, Zhang Xi-guo
    1991, 12(7):  897-901. 
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    2-(2-Thienyl)propionic acid, 2-(5-bromo-2-thienyl) propionic acid and 2-(5-ethyl-2-thienyl)propionic acid were prepared from α-haloa]kyl thienyl ketones. The effects of the shift groups, alkyl substituents, leaving groups of the ketones, catalysts, temperature and solvents etc. on the rearrangement were studied. An optical active 2-(5-ethyl-2-thienyl)propionic acid was obtained in a high yield. It may be concluded that the 1,2-thienyl migration belongs to the electronic-lacking rearrangement with SN2 mechanism.
    The Crystal Structure of 15-Methyl-bicyclo[10,3,0]pentadec-1(12)-en-13-one and Its Stable Molecular Conformation
    Tang Ji-wei, Liu Jing-jiang, Hu Zhong, Wan Xiao-Ian, Yao Xin-kan, Wang Ru-ji
    1991, 12(7):  902-905. 
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    The single crystal of 15-methyl-bicyclo[10, 3, 0]pentadec-1 (12)-en-13-one belongs to rhonoclinic system, space group P21/n, α = 0. 4838(1) nm, 6=1. 3949(2) nm, c=2. 1645(4) nm, β=92. 07(1)°, Z = 4. The molecule of such compound is bicyclic and linked by a C=C bond, one cycle is a planary five-membered ring and the other is a cyclododecene part. The molecular conformation in the single crystal is compatible to the most stable one of the conformational isomers calculated by molecular mechanics.
    Studies on the Chemical Constituents of Saussurea Japonica (Thunb) DC.
    Shi Jian-gong, Jia Zhong-jian, Li Yu
    1991, 12(7):  906-909. 
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    Sixteen compounds were isolated from the aerial parts of Saussurea japanica (Thunb) DC. and their structures were identified by spectroscopic methods. Three of them were new. kaempferol-3-O-(6"-O-crotonyl)-β-D-glucoside(I), quercetin-3-O-(6"-O-crotonyl)-β-D-glucoside(2), and syringin methyl ether(3); the others were known compounds; kaempferol-3-O-β-D)-glucoside, quercetin-3-O-β-D-glucoside, syringin,α-amyrinyl palmitate,β-amyrinyl palmitate, lupeol palmitate, lupeol acetate, lupeol, β-sitosterol, palmitic acid, tetracosanic acid, cerotic acid, and pentacosane.
    24-Methylene-Cholestane-3β,5α,6β,19-tetraol--a Novel Polyhydroxylated Sterol with Rare 19-Hydroxyl Group
    Zeng Long-mei, Wang Guiyangsheng, Li Feng-ying, Zhong Yong-li
    1991, 12(7):  910-911. 
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    A novel polyhydroxylated sterol, Nephalsterol-A(1)with rare 19-hydroxyl group was obtained from the ethanol extracts of the soft corals Nephthea albida and Nephthea tiexieral verseveldt collected from Xisa Islands and Nansa Islands respectively, colorless needle crystal, m. p. 242-243℃, [α]D20 = 0(C 0. 053, MeOH). The structure of (1) has been established as 24-methylene-Cholestane-3β, 5α,6β,19-tetraol by means of IR, 1HNMR, 13CNMR and MS technique.
    The Research on Development of Novel Pesticides (Ⅲ)--The Synthesis of Imidazolinones
    Wang Li-kun, Li Zheng-ming, Liu Tong-zhu, Jiang Yi-min
    1991, 12(7):  912-914. 
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    3-(3,5-dichlorophenyl)-1-isopropyl-carbamoylhydantoin has been developed as a commercial fungicide known as R'oyral. Nevertheless, the starting material 3,5-dichloroaniline for the synthesis is not easily available. The latter was replaced by other substituted anilines here, followed by conversion to isocyanates by triphosgene and cyclization into heterocycles in one-pot reaction. 22 new compounds were synthesized with all structures confirmed by elementary analysis,IR, NMR and MS. Biological screening indicated that 5 compounds were effective against black rot of apple (Physalospora piricola Nose).
    Studies on CpTiCl2-LiAlH4System--Reduction of Cyclic Acetals and Ketals
    Wu Shao-zu, Chen Yin, Zhang Yu-lan
    1991, 12(7):  915-917. 
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    Treatment of CpTiCls with 2 molarity of LiAlH4in Et2O at 30℃ produces organo-titanium species which react with cyclic acetals and ketals derived from aromatic (or aliphatic) aldehydes and ketones, giving the corresponding hydroxyalkyl ethers and alkyl benzenes (or aliphatic hydrocarbons).
    Comparison of the Hydrolyzed Activity of β-Glucuronidases from Different Sources While Determining the Testosterone Level in Doping Control
    Zhang Chang-jiu, Zhang Yi-zhong, Lin Qiang, Ye Li, Yang Tian-le, Zhang Ji, Liu Chun-sheng, Wang Mu-zou, Zhou Tong-hui, Yang Ze-yi
    1991, 12(7):  918-920. 
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    Selected Ion Monitor (SIM) of GC-MS is used to determine the amounts of testosterone (T), epitestosterone(ET) and their ratio in urine.The affection of five β-glucuronidases to the determination of Tlevel has been compared. It is figured out that both the Calf Enzyme (made in China) and the E. Coli(IX-A) from Sigma have strong activities while hydrolyzing the combined T, ETin urine. So they are fit to the determination of Tand ETlevel of urine in doping Control.
    Studies on Organoarsenic Compounds (XⅧ)--Effects of Solvents on the Reaction Products of the o-Fluorobenzyltri-phenylarsonium Bromide with Aromatic Aldehydes
    Zeng Wu-Zong, Tao Wen-tian
    1991, 12(7):  921-923. 
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    This paper presents the reaction of arsonium salts (1,2) with aromatic aldehydes in the two phase system of C6H6(CH2Cl2)-50% NaOH(aq.) at room temperature to afford frons-olefinic derivatives (3a-i), and the yields were 86%-94%. We also found that the solvent effects exist in the phase transfer reaction between (2) with the aromatic aldehydes.
    Studies on the Chemical Constituents of the South China Sea Sponge (Ⅱ)
    Zeng Long-mei, Fu Xiong, Su Jing-yu, Zhou Hua
    1991, 12(7):  924-926. 
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    Ten A-nor sterols (1-10), isolated from the marine sponge Phacellia fusca schmidtcollected from the South China Sea, were identified on the basis of the data of GC-MS and some other spectro-metric methods. These sterols are known but were found for the first time in the marine sponge P. fusca schinidt. The finding of the class of A-nor-sterols is of considerable value for chemotaxonomy of the Axinellidae family sponge.
    Studies on the Structure and Fluorescence Spectra of 2-(4'-i-pr-Styryl)-5-Phenyl-Benzoxazole
    Pan Yin-ming, Zhao Xu-Miao, Zhou Yi-min, Wang Ru-ji, Wang Hong-gen
    1991, 12(7):  927-931. 
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    2-(4'-i-pr-styryl)-5-phenyl-benzoxazole was synthesized by condensation of the 5-phenyl-methyl benzoxazole with p-i-pr-benzaldehyde in the medium of KOH/DMF.This compound was identified by elemental analysis, IR, NMR, UVabsorption, FLemission spectra and X-ray diffraction. The molecular structure was confirmed that it belongs to triclinic system. The results of CNDO/s calculation showed that the fluorescence emission spectra of compound (Ⅰ), compared with its model compound (Ⅱ), was red shifted. The FLintensity of compound (Ⅰ) is three times greater than that of compound (Ⅱ). This is consistent with the experimental result.
    Quantum Chemical Study of the C-C Central Bonds in Small Propellanes
    Zhao Cun-yuan, Wei Tong-shi, Qiu Wen-yuan
    1991, 12(7):  932-934. 
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    In this paper, using semiempirical molecular orbitals MNDO procedures, the central bonds in small propellanes, such as [1. 1. 1], [2. 1, 1], [2. 2.1], [2. 2. 2] propellanes, are studied. The calculation results show that the strength of the side bonds in small propellanes is close to that of the bonds in common ring molecules, while the weaker covalent bonds are formed between the bridgehead carbon atoms than the bonds in common ring molecules. As the size of the rings in propellanes increases, the strength of the C-Ccentral bonds increases. Our theoretical calculations are in good agreement with the experimental and theoretical conclusions reported.
    Investigation of the Intermediates During the Reduction Process of Oxygen on Au Electrode in Alkaline Solution
    Wu Bing-liang, Sun Ai-jun, Zhang Hong
    1991, 12(7):  935-938. 
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    Applying the ameliorated PSCC on RDE, the electric quantities needed for the soluble and adsorbed intermediates during the reduction process of oxygen on Au electrode in alkaline solution were measured, respectively. The results demonstrate that the quantity of adsorbed intermediate is dependent on the electrode potential. However, its molecular specificity is still required to be identified.
    The Complexing of Glucoamylase with Fluorescent Probe Tb(Ⅲ)
    Zhai Guo-tang, Yuan Jing-ming, Yuan Tao
    1991, 12(7):  939-941. 
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    The bonding properties, enviroment and the dissociation constant of glucoamylase with Tb(Ⅲ) as a fluorescent probe were investigated. The results show that an enzyme molecule could be bonded with 4 Tb(Ⅲ) at 20℃> pH 4.6, and the bonding site is in the free carboxyl groups which belong to Glu/Asp, KD was calculated to be 2. 5×10-4mol/L. The fluorescence intensity of Tb(Ⅲ) is greatly sensitized by the enzyme to 1000 folds at 545 nm. On the contrary, the fluorescence intensity of glucoamylase at 345 nm is quenched and the quenching efficiency is calculated to be 0. 75%.
    Studies on the Synthesis and the Phase Components of the Water in Water Emulsions
    Jin Zheng-zhong, Zhu Yong, Hu Yong-dong
    1991, 12(7):  942-945. 
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    This paper reports a systematic research on the synthetic conditions of PAM-PEG and PSA-PEG water in water emulsions. Aphase separation diagram shows the area in which the PAM-PEG and PSA-PEG emulsions can exist stably. The polarographic method was applied to the analysis of the polymer solution for the first time in combination with 1HNMR, Laser Raman Spectrometric method and micrography, and the results obtained elaborate the components of two phases in the emulsions-PEGsolution is the continuous phase, the PAM and PSA are the dispersed phases respectively.
    WO3Anodic Oxide Film(Ⅰ)--Electrochromic and Auto-bleatching Processes
    Lin Zhong-hua, Chen Kun-yao, Zheng Zhi-zhen, Chen Hai-yi
    1991, 12(7):  946-949. 
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    The electrochromic and auto-bleatching processes at the WO3anodic oxide film in 0. 5 mol/L H2SO4solution were studied by cyclic voltammetry, A. C. impedance technique and photocur-rent spectrbscopy. The coloration mechanism consists of hydrogen adsorption on the WO3film surface and the transport of Hatoms in the WO3lattice. The bleatching process involves at least. transport of interstitial Hatoms and hydrogen desdrption at the WOS film surface, resulting in interstitial H+ions; then extration of H+droven by the external electric field. The auto-bleatching is arised from hydroxy-lation due to both partial interstitial Hatoms and the trace amount of water contained in the film.
    Studies on Molybdotungstoniobophosphoric Heteropoly Compounds (Ⅰ)--Syntheses and Characterization of the Heteropoly Acids
    Qu Lun-yu, Ma Li, Liu Jing-fu, Chen Ya-guang, Peng Jun, Yu Ming
    1991, 12(7):  950-953. 
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    The method of syntheses and properties of a system of heteropoly acids of [PNb2MoxW1-xO40]5-(x=0,2,4,6) are reported, in which the acidification and the addition of materials are carried out stepwise. The optimal rate of the materials and the pHof the reaction are given. The determination of IRand UVspectra shows that the acids have Keggin structure. The polarographic data confirm their reduced patterns. The potential titration in organic solvent gives their alkaline of 5. The experiments of thermal stability indicate that the crystal water is essential to stabilizing of these acids.
    Studies on Iridescent Chromium Films Electrodeposition
    Ge Fu-yun, Xu Shu-kai, Zhou Shao-min
    1991, 12(7):  954-957. 
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    Iridescent chromium films prepared by cathode electrodeposition on Ni substrate are studied by XPS and UPS. The mechanism of the film formation is also studied by electrochemical method. The results show that the films consist of three layers: (1) Surface layer, about 30 nm thick, containing Cr(Ⅵ) and Cr(Ⅲ)[Cr(OH)3, CrOOH and Cr2O3], which were formed by adsorption of chemical compounds near the elecctrode; (2) Intermediate layer, about 200 nm thick, mainly composed of Cr2O3produced by electroreduction of CrO3; (3) Interfacial layer connected with the substrate, about 150 nm thick, comprised of Cr2O3, Cr and Ni. The third was formed by reduction of the oxide films on the electrode. The colour of the films arises from the absorption of light of the unpaired 3d electrons under the influence of O2-distorted octahedral iigand field and from the light interference in the thin films.
    Lipid-Free Copper Phthalocyanine-Tetrasulphonate Multilayer System--Electron Inelastic Mean Free Path
    Chen Hui-juan, Chai Xiang-dong, Tian Ke, Wei Quan, Li Tie-jin
    1991, 12(7):  958-960. 
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    Multilayer system of copper phthalocyanine-tetrasulphonate is an ordered organic molecular film assembled by LBtechnique. It is very stable for XPSmeasurement. In this work, we studied the peak intensity variation of Cu2P3/2、Ni1v、S2p in the samples with different thicknesses of the film at a-constant take-off-angle and obtained the inelastic mean free path 26, 22, 48Å respectively. We also gave explanation to the influence of scattering effect caused by the ordered molecular orientation on the inelastic mean free path.
    Studies on Cyclodextrin Inclusion Complex with Fluorescence Anisotropy
    Jiang Yun-bao, Huang Xian-zhi, Chen Guo-zhen
    1991, 12(7):  961-964. 
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    An equation for the determination of equilibrium association constant (KA) of cyclodextrin inclusion complex with fluorescence anisotropy was derived and used to determine KAof pyrene-β-cy-clodextrin inclusion complex satisfactorily. The existing form of inclusion complex and the host-guest interaction were discussed based on the derived equation along with the curve of fluorescence anisotropy versus cyclodextrin concentration for guest/cyclodextrin system. The possibility of application β-cyclodextrin in the analysis of metal ion using naphthalene derivative as a ligand was predicted.
    The IRC Method in Chemical Reactions (X)--The Ab inttio Study on the Dehydrogenations of Amino-Carbene
    Chen Bin, Zhao Cheng-Da, Pu Qiang
    1991, 12(7):  965-967. 
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    The ab initio calculations have been performed on the reaction paths of 1,1-and 1,2-dehy-drogenations of amino-carbene. We have determined the geometries and energies of two transition states, and obtained the activation energies, frequency factors and the activation entropies at the RHF/4-31Glevel. The vibrational correlation from the reactant to the transition state indicated that the IRC of 1,1-H2elimination was associated with the deformation mode of 1491cm-1, and the IRC of 1,2-H2elimination was connected with the C-H bond asymmetrical stretching mode. The vibrational coupling between normal coordinates occuring in the 1,1-H2elimination path was strong, and that occured in the 1,2-H2elimination path was weak. The results provided some useful informations and introduction for the study of laser-inducing and mode-selective chemical reaction.
    Electrochemical Study on the Formation of Dye Image
    Yao Zu-guang
    1991, 12(7):  968-969. 
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    The density of the dye clouds was investigated by using an electrochemical method, where QDI can be produced quantitatively by the oxidation of CD-I. The influence of developing times and concentration of coupler on the dye clouds was also discussed.
    ESR Studies on Singlet Oxygen Generation of Meso-Tetrakis-(substituted phenyl) Porphine Derivatives
    Chen Ji-yao, Lu Ya-meng, Chen Shi-ming, Cai Huai-xin, Xu De-yu, Wang Shao-yin
    1991, 12(7):  970-972. 
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    The ability of meso-tetrakis-(substituted phenyl) porphine derivatives for photo-generating singlet oxygen (1O2) is studied by ESRspectrometry. The results show that the singlet oxygen yields of most of porphine derivatives are higher than that of HPD. It is also exhibited that the nature and structure of the substituent at the meso position are closely related to the photosensitizing ability of meso-te-trakis-(substituted phenyl) porphines.
    The Effect of Interactions Between Polyhydroxyaluminium Chloride and Hydrolyzed Polyacrylamides on Flocculations of Sodium Montmorillonite Suspension
    Zhang Ji-shu, Chen Zhong-qi, Xu Xin
    1991, 12(7):  973-975. 
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    The flocculation of sodium montmorillonite suspension at pH=9 was systematically studied with an polyhydroxyaluminium chloride followed by a series of polyacrylamides(M = 3×106) with different hydrolyzed degrees. The results show that the bonding interactions between hydroaluminium ions arid ionic and nonionic polyacryamide have a decisive influence on the flocculation behavior of the respctive polyacrylamide towards montmorillonite suspensions. These interactions are probably specific and arise from the opposite charge interactions between the hydrolyzed metal ions and polyacrylamide, though hydrogen bonding may also play a part.It appears possibly that the positively charged hydjrolyzed metal ions can act as "anchor points" to attach the negatively charged polyacrylamides to the surfaces of negative charge. The flocculation effect of the polyacrylamide can therefore be enhanced by the increased adsorption, though an excess of "anchor points" might flatten the polyacrylamide and hinder flocculation.
    Preparation and Properties of a Novel Dihydroxy Bonded Stationary Phase Triethylene Glycol Silica Gel
    Liu Wu-ping, Da Shi-lu
    1991, 12(7):  976-978. 
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    A new silica gel bonded phase, dihydroxy triethylene glycol bonded stationary phase (DHG-BSP), was synthesized. The conditions for preparation, together with its physicochemical properties and applications were studied. It is shown that the DHGBSP is an excellent material with high concentration of bonded phase(394μmol/g), good thermal and chemical stabilities and highly selective separation for aromatic amines and some amino acids.
    Monte Carlo Simulation Method of Radical Polymerization
    Tong Wei-da, Lu Jian-ming, Sun Meng, Yang Yu-liang
    1991, 12(7):  979-982. 
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    In this paper, the unsteady state kinetic problems of initiated free-radical polymerisation are studied by means of Monte Carlo simulation method. The peculiar "None Stretching Problem", which is accompanied with the numerical solution of the kinetic equation of free-radical polymerization, was solved by using the biased sampling method in the Monte Carlo simulation. The results of Monte Carlo simulation are in agreement with those of analytical solution of the unsteady state kinetic equation. Because of the simple character of Monte Carlo algorithm, the Monte Carlo method can be easily extended to treat the system of free-radical polymerization with a higher complexity.
    The Effect of Doped Anions on the Properties of Poly-o-methylaniline Synthesized by the Electrochemical Method
    Sun Dong-hao, Shi Yu-jun, Mu Shao-lin
    1991, 12(7):  983-986. 
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    The electrochemical polymerization rate of o-methylaniline in the acidic media is affected by the kind of acids. The difference Detweeh the polymerization rates leads to the variant morphologies between polymer films doped with Cl-, BF4-, SO42- and PO43-, respectively. The conductivity and shape of the cyclic voltammogram of poly-o-methylaniline are dependent on the kind of the doped aions, and their capacity values are not only dependent on the kind of the doped anions, but also their morphologies) however, the electrochromic properties and UV-visible spectra are independent of the doped anions.
    Mechanical Properties of Poly[Methyl Acrylate-2-(Dimethylamino)ethyl Methacrylate]/Epoxy Resin IPN
    Wang Jing-yuan, Li Yu-wei, Song Hai-qing, Gao Chang-you, Tang Xin-yi
    1991, 12(7):  987-990. 
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    Simultaneously interpenetrating polymer networks were prepared from polyrmethyl aery-late-2-(dimethylamino)ethyl methacrylate]/epoxy resin [P(MA-DMA)/EP]. Mechanical properties of IPNs were measured. Asingle glass transition teinperature and a better compatibility were observed. This shows that the sample is the mixed polymer of cross-linking and interpenetrating networks. When P(MA-DMA)/EP= 20/80, there exists positive synergistic. effect. (Tg)calcdwas calculated by Fox equation and it was found that (Tg)exp-(Tg)calcdwas proportional to (dexp-dcaled). Moreover, the value of (Tg)exp-(Tg)caicdcan represent approximately the ratio of interpenetrating to cross-linking.
    Syntheses and Properties of Copolycondensates of Phenolic and Crown Ethers
    Shu Jia-you, Hu Hong-wen
    1991, 12(7):  991-993. 
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    Five new polycondensates of phenolic and crown ethers are prepared by the condensation of 2,6-dihydroxymethyl-4-methoxylphenol with dibenzo-18-crown-6(2B18C6), dibenzo-24-crown-8(2B24C8), dibenzo-30-crown-10 (2B30C10), benzo-15-crown-5 (B15C5), benzo-18-crown-6(B18C6), respectively. The collecting efficiency of polymeric crown ether (PB15C5) for K+, Ag+, Mg2+, Pb2+, Cu2+(10-6-10-4mmol/mL) come close to 100%.
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