Loading...
CJCU

Table of Content

    24 November 1988, Volume 9 Issue 11
    Previous Issue    Next Issue
    Articles
    Solid State Reaction of Coordination Compounds (XXV) ——The Solid State Reaction of Iron (Ⅲ) Oxalate and Lewis Base in Hydrogen and Helium Atmosphere
    Yuan Jinhua, Xin Xinquan, Dai Anbang, Zhang Yuchang, Huang Jianping
    1988, 9(11):  1095-1099. 
    Asbtract ( )   PDF (505KB) ( )  
    Related Articles | Metrics
    By use of non-isothermal technique in hydrogen and helium atmosphere the solid state reaction of iron(Ⅲ) oxalate and Lewis base was studied by gas chroma-tography accompanied by IR, XRDand Mossbauer spectroscopy. The results show that the solid state reaction of iron oxalate and potassium tetrasulfide starts at 200℃ and ends at 300℃, releasing CO2 and forming KFeS2 which is confirmed by Mossbauer spectra and XRD. The solid state reaction of iron (Ⅲ) oxalate and sodium hydroxide takes place at room temperature, which turns the reactant color to brown, resulting in the formation of alpha-Fe2O3 and Fe(OH)3, with the rising of temperature the amount of alpha Fe2O3 is increased due to the deaquation of Fe(OH)3, no CO2 is released around 180℃ indicating the entirely dissappearance of iron (Ⅲ) oxalate, which confirms the completion of the solid state reaction.
    Studies on Powdery White Tungstic Acid(Ⅻ)--Preparation and Properties of Certain Organic Ammonium Polytungstates
    Song Yuan, Ma Peilian, Gu Yidong
    1988, 9(11):  1100-1103. 
    Asbtract ( )   PDF (327KB) ( )  
    Related Articles | Metrics
    Ethylene diamine and ethanol amine react with white powdery tungstic acid to form metatungstates and paratungstates at weak acidic and neutral media respectively. Isopropyl amine forms metatungstate at pH3~7 region. The compositions of these polytugstates are shown in table 1. UV, 1R, PMR and polarographic studies have all been performed for these compounds. It has been found that only the metatungstates of ethanol amine and isopropyl amine are photosensitive. On exposure to sunlight or ultraviolat ray, significant absorption peaks appear at 620 and 860nm respectively. The decay rates concerning extinction of the peaks obey the pseudo-first order rate equation.
    The Synthesis and Crystal, Molecular Structure of Er(PMAP)3·2H2O
    Chen Botao, Ren Liping, Luo Baosheng, Zhan Liaorong
    1988, 9(11):  1104-1108. 
    Asbtract ( )   PDF (212KB) ( )  
    Related Articles | Metrics
    Er(PMAP)3·2H2O crystal belongs to monoclinic system. α=17.582 (4)Å, b= 12.346(2)Å,c = 18.236(3)Å, β=102.8(2)°. Space group P21/c, Z=4. The diffraction data(Mo, Kα) were collected with type CAD4(Holland) fpurcircle diffractomer. The structure was determined by heavy atom method and refined by least square program, R = 0.06298
    Studies on New Inorganic Ion-Exchanger(Ⅱ)--Chromatographic Behavior of 47 Cations on Paper Impregnated with Zinc Antimonate
    Yin Bohai, Ma Feng, Li Zhu
    1988, 9(11):  1109-1113. 
    Asbtract ( )   PDF (358KB) ( )  
    Related Articles | Metrics
    The chromatographic behavior of 47 metal ions was investigated on plain and ZnSb papers in dimethylsulfoxide-nitric acid and aqueous nitric acid systems. The relations between Rf values of some metal ions and DMSO, concentration of nitric acid, ion potential, screening-loss parameters of ions were discussed. The results showed that a lot of ion-couples or groups were separated under proper conditions.
    Study on the Determination of Trace Manganese by Luminol-Mn(Ⅱ)-KIO4 Ghemiluminescence System
    Geng Zheng, Zhang Zhiqi, Bian Lujiao
    1988, 9(11):  1114-1117. 
    Asbtract ( )   PDF (267KB) ( )  
    Related Articles | Metrics
    Asensitive and selective analytical method has been developed for determination of trace amount of manganese, it bases on luminol-Mn( E )-KIO4 chemiluminescence system and triethanolamine as activator. The detection limit of the method is 8×10-6μg/mL of Mn( Ⅱ). The linear range of the working curves is 10-5~0.1μg/mL. The relative standard deviation is less than ±3%. The method was applied to determination of manganese (Ⅱ) in well water and human hiar with satisfactory results.
    Studies on the Syntheses and Properties of Some Organic Titana-fluorenes
    Shen Huafeng, Yin Rongjun
    1988, 9(11):  1118-1121. 
    Asbtract ( )   PDF (282KB) ( )  
    Related Articles | Metrics
    Nine new organic titana-fluorenes were synthesized by the reaction of 2,2′-dilithio-biphenyl (Prepared by lithiation of 2,2′-dibromobiphenyl with n-butyllithium) with dichlorodicyclopentadienyl titanium, dichlorodi (methyl-cyclopendienyl) titanium or dichlorodiindenyl titanium. They were separated by chromatography on silica. Their structures have been characterized by elemental analyses, IRspectra, 1HNMRand UVspectra. The reactions of 5,5-dicyclopenta-dienyl titana-fluorene with electrophilic reagents, such as HCl, HBr, SOCl2,I2 and (PhCOO)2, were studied.
    Synthesis and Physical Properties of Some 1,4-Bis(1',3'-Benzoxazolyl-2') Benzene Derivatives
    Zhou Yimin, Xia Xiaoping, Gao Zhenheng
    1988, 9(11):  1122-1125. 
    Asbtract ( )   PDF (328KB) ( )  
    Related Articles | Metrics
    Thirteen of 1 ,4-Bis(1',3'-Benzbxazblyl-2') -benzene derivatives are synthesized, they are all new compounds. Their m. p., IR, UVabsorption spectra, fluorescence emission spectra, fluorescence quantum efficiencies, fluorescence lifetime as well as laser conversion efficiencies of the compounds are determined. The results obtained show that the absorption maximum is at 330-350nm and the fluorescence maximum at 385-406nm. In comparison with unsubstituted compound they have lower melting points and higher solubilities. These compounds are moree coplanar and higher fluorescence quantum efficiencies. The compound ⅩⅢ reported here has a. higher laser conversion efficiency than those other ones of homologous (10% above) and is photochemically stable.
    Studies on Mass Spectrometry of Natural Products (Ⅶ)--Determination of Configuration of Some Acyclic Glycols
    Hua Suming, Li Hong, Chen Yaozu, Li Haiquan, Zai Jianjun, Chen Nengyu
    1988, 9(11):  1126-1130. 
    Asbtract ( )   PDF (269KB) ( )  
    Related Articles | Metrics
    There are a lot of studies on the stereochemistry of cyclic glycols by means of mass spectrometry, but the studies on the relative configurations of acyclic glycols by MShave not been found in literatures. This paper presents that the relative configurations of some acyclic glycols were firstly determined by Reaction Mass Spectrometry (RMS) using trimethyl borate as reagent. In five pairs of three- and erythro-isomers studied, there are no characteristic differences between their routine chemical ionization mass spectra. But in their reaction mass spectra, the relative abundance ratio, r, of characteristic ion, [Ms+MR+H- 2CH3OH]+, to reference ion, [Ms+H-H2O]+, produced by the glycols of threo-configuration was much greater than that produced by erythro-isomers. Based upon this fact, we can distinguish the relative configurations between a pair of stereoisomeric acyclic glycols. And these phenomena were explained in virtue of the principles of stereochemistry.
    The Method of Topologization on the Distribution of Electronic Density from Semi-experimental SCF-MO Method(Ⅰ)
    Zheng Shijun, Zhang Shaowen, Cai Xinhua, Xu Zhenfeng, Tang Dinghua
    1988, 9(11):  1131-1135. 
    Asbtract ( )   PDF (336KB) ( )  
    Related Articles | Metrics
    The topological analysis on the electronic density distributions of which based on CNDOcalculations has been studied. Adding the inner-electron contri-bution the total charge distributions were obtained, on which the topblbgical properties of small molecules and B2H6 (bridge), CH5+ were discussed. The results of calculations in this paper are accordant with the conclusions of Barter's work qualitatively.
    Studies on the Extraction Kinetic of Fed) with 2-Ethyl Hexyl 2-Ethyl Hexyl Phosphonic Acid (HEH[EHP])
    Gao Zili, Sun Sixiu, Shen Jinlan, Yu Weipu
    1988, 9(11):  1136-1140. 
    Asbtract ( )   PDF (333KB) ( )  
    Related Articles | Metrics
    The extraction kinetics of the system Fe(Ⅲ)/1.0mol.L-1(Na,H)NO3/ HFH[FHP]-heptane has been studied at 298±1K with highly stirred tanks. The change of concentration of Fe(Ⅲ) in the aqueous phase with the extraction time is determined by potentiometry.
    The Coordination of 4,7-Diphenyl-1,10-Phenanthroline with d10 Configuration Metal Ions Zn2+, Cd2+ and Hg2+
    Chen Liang, Hu Yuxian, Wang Baolun, Lu Yun
    1988, 9(11):  1141-1145. 
    Asbtract ( )   PDF (360KB) ( )  
    Related Articles | Metrics
    The coordination mechanism of 4,7-diphenyl-1, 10-phenanthroline with d10 configuration metal ions Zn2+ , Cd2+ and Hg2+ has been discussed with the aid of NMRtechnigue and spectrophotometry. The compositions of the complexes were determined, and the circumstance of coordinatioh equilibriums in the complex process was analysed. The scale of stability of coordination bonde has been set up. So we have inferred the structures of the complexes and the bent coordination bond in them. The problem on studying directly coordination mechanism of complexes with central ions of d10 configuration without d-d transition was solved and the stereo-configuration of the complexes separated difficultly was determined experimentally.
    The Measuring About Kinetic Parameters of Curing Reaction for HTPB-TDI by Thermokinetics
    Yan Hua, Zhou Xuzliang, Li Mingxia
    1988, 9(11):  1146-1149. 
    Asbtract ( )   PDF (315KB) ( )  
    Related Articles | Metrics
    The kinetics of polymerization was studied by thermokinectics, based on the conduction type automatic calorimeter (Model RD-I) , we devised the reactor. The kinetic parameters of curing reaction (apparent activation energies, the rate constant of reaction) were studied for the system hydroxy-terminated poly-butadiene (HTPB) and tolyene diisocynate (TDI), the results are in agreement with the values which were determited by TBA,infrared spectrograph and the visco-metric method.
    Salt Effect of Vapor-Liquid Phase Equilibrium in the System Formic Acid-Acetic Acid-Water-Sodium Acetate
    Li Xi, Jiang Fuming, Kang Hongye, Luo Ruyi, Xu Qintang, Fan Shuguang
    1988, 9(11):  1150-1154. 
    Asbtract ( )   PDF (316KB) ( )  
    Related Articles | Metrics
    Vapor-liquid equilibrium data (VLE) were measured by Otsuki-Wil-liams still for the formic acid-acetic acid-water-sodium acetate at 9.866×104Pa.2 mol/(kgsolv) of NaAc was used. The results show that the favorable effect ofNaAc is not only chemical action but also physicochemical action. It related totwo salts to the phenomena of salting-out, salting-in and anomalous behavior incomponents. Acording to VLBdata, we have drawn up the VLBcurve, the curveof the volatilities equal to 1 and the curve of the ralative volatilities equal tofor distinguishing and analysing the influence of salt effect.
    Modification of the Empirical Potential Energy Functions
    Xu Zongrong, Tian Zhiyue
    1988, 9(11):  1155-1159. 
    Asbtract ( )   PDF (308KB) ( )  
    Related Articles | Metrics
    Ageneral method to modify the empirical potential energy functions is proposed V(r) =W(r)V'(r) with correction function W(r) = exp{p[((re/r)q-1]}. It has been successfully used for the modification of the Rydberg functicn and the Pseudogaussian (PG) function.
    The Morphology and Molecular Structure of Acrylate Tri-Copolymer Prepared by Semi-Continuous and Batch Process of Emulsion Polymerization
    Zhou Xiaoqi, Zhang Kai, Zhou Mingguo, Xu Xi
    1988, 9(11):  1160-1163. 
    Asbtract ( )   PDF (679KB) ( )  
    Related Articles | Metrics
    The morphology and molecular structure of acrylate emulsion tri-copolymer prepared by both semi-continuous and batch process were : studied. The results: revealed that in semi-continuous copolymerzation process, the particle size and size distribution became larger and wider when import speed of monomers increased, whereas batch one had maximum values of particle size and distribution. For latex polymermerized by batch method, the macromolecular chain with different monomer sequence lengths and distribution existed in the particles, forming "single core-shell structure" , on the - other handy molecular chain of copolymer with homogeneous distrbution of structure units tangled in the particles made by semi-continuous process, forming "multi-core-shell structure" . The synthesized random copolymers revealed microphase separation structure, the faster the import speed of monomers, the greater the separated degree, and it reached a maximum level in batch copolymer.
    The Investigation of the Adsorption for Au(Ⅲ) by Macroporous Polymeric Adsorbent Made of Poly (Triallyl Cyanurate)
    Zhang Gengyi, Cuo Xianquan, Zhang Quanxing, He Binglin
    1988, 9(11):  1164-1167. 
    Asbtract ( )   PDF (293KB) ( )  
    Related Articles | Metrics
    The pore structures and adsorption properties of these adsorbents were examined as a function of pH, initial gold concentration and selectivity. The experimental results suggest that the ion pair H3O+AuCl4- were adsorbed by the adsorbent through the formation of weak bond with the ester oxygen or nitrogen of the polymer matrix.
    Poly(Styryl)biphenylphosphine-Titanium Tetrachloride Complex
    Shen Ji, Ran Ruicheng
    1988, 9(11):  1168-1172. 
    Asbtract ( )   PDF (246KB) ( )  
    Related Articles | Metrics
    Across-linked bead of poly (styryl) biphenylphosphine containing 5.02% of phosphine was synthesized and combined with titanium tetrachloride in chloroform to form a very stable polystyrene bound bi(triphenylphosphine) -titanium tetrachloride complex containing 15.8% of chlorine which corresponds to 0.831mmol TiCl4/1g·complex beads. The complex can be used to catalyze a lot of organic reactions, such as esterifications, acetalizations, ketal formations and etherification in high yield. It is important that the complex as a polymer-supported Lewis acid catalyst have better stability and can be reused at least 10 times.
    Replacement-Diffusion Method for Mg2Ni0.75Cu0.25-Mg1.76 and Related Hydrogenation
    Zhang Yunshi, Chen Shengchang, Yuan Huatang, Feng Xianbao, Zheng Song
    1988, 9(11):  1173-1175. 
    Asbtract ( )   PDF (197KB) ( )  
    Related Articles | Metrics
    Replacement-diffusion method is reported to prepare Mg2Ni0.75Cu0.25Mg1.76 alloy. Surfaces of the alloy particles have been investigated- by AES. It has been found that Ni and Cu are greatly enriched on their surfaces. The under layer of the particles are Mg.The study of the hydrogen adsorption and desorption process for the alloy was carried out. The catalytic activity of Mg2Ni0.75Cu0.25 in the hydro-genation of Mg was observede.Amodel was suggested to describe the hydrogenation-dehydrogenation of Mg2Ni0.75Cu0.25-XMg system.
    The Study of the Background Absorption of Seawater in the Graphite Furnace Atomic Absorption Spectrometry
    Mo Shengjun
    1988, 9(11):  1176-1178. 
    Asbtract ( )   PDF (307KB) ( )  
    Related Articles | Metrics
    The Character and the source of the background absorption of seawacer and the method of decreasing the background were studied.The wavelength-dependence of the background of seawater is quite similar to that obtained from sodium chloride. The evaporation curves of seawater and sodium chloride in the graphite furnace are also quite similar. These show that nonspecific absorption of seawater arises mainly from sodium chloride. The study of atomization time vs absorbance curves shows that the outline of the background abrorptiqn is dependent on the atomization temperature and heating rate. To decrease background absorption from seawater, the addition of matrix modifiers such as nitric acid or ammonium nitrate is satisfactory.
    2-Diisopropylamino-3-methyl-5-(4-dimethyl-aminoazo-benzene)-1,3,4-thiadiazol(TDAA-1) as a Chromogenic Reagent
    Zhang Xufang, Shen Shinian
    1988, 9(11):  1179-1181. 
    Asbtract ( )   PDF (182KB) ( )  
    Related Articles | Metrics
    The cited reagent was synthesised and its properties were investigated. Absorption max. and e values are tabulated for its ion associates with halide complexes of Ag, Au, Bi, Ga, Fe, Hg, In, Pd, Sb, Te, Tl,Re as well as some heteropolyanions. The reagent is considered to have potential for the determination of the ab.pve mentioned elements.
    Equilibrium Solubilities of Xylene and Halogeno- Benzene in Silver Nitrate Solutions
    Piao Chengyun, Wang Guifen, Yin Qifan, Xu Changlu
    1988, 9(11):  1182-1184. 
    Asbtract ( )   PDF (194KB) ( )  
    Related Articles | Metrics
    Satuiated solutions of five aromatic hydrocarbons of o-xylene, m-xylene, p-xylene, chlorohenzene and bromobenzene were prepared by circulation of the solute valour in closed system. At the same time solubilities of aromatic hydrocarbons were determined in a varity of silver nitrate solution with diffeient concentrations (ionic strength was adjusted to 1.00 by potassium nitrate solution). The formation constants of complexes produced by silver ion with the abave five aromatic hydrocarbons were calculated by actual solubility measured by using curve-fitting methed. The result are compared with the literature values.
    Determination of Domiphen Bromide by Oscillopolarographic Titrations
    Cheng Guangxin, Pan Xixia, Zhang Zhengxing
    1988, 9(11):  1185-1186. 
    Asbtract ( )   PDF (121KB) ( )  
    Related Articles | Metrics
    Dorniphen Bromide (Ⅰ) was determinated by oscillopolarographic titration. THin film mercury electrode was used as indicator electrod and tungsten electrode as reference electrode. 20 mLof solution(-40mg Ⅰ)was mixed with 10mLof 2mol/L NaAc-HAc buffer (pH = 5.0-6.5) and distilkted H2O to a final volume of 50mL. After filtration, 25mLof the filtrate was adjusted to alkaline with 20% NaOH solution and subjected to titration with a standard Tl2SO4 solution for the determination of I. At same time, the blanck test for correction must be performed. The recovery of materials was 99.80 ±0.32%.
    Studies on Chemical Constituents of Bupleurum Yunchowense Shan et Y. Li. Roots
    Zhang Zongping, Jia Zhongjian, Wang Maotian, Zhu Ziqing
    1988, 9(11):  1187-1189. 
    Asbtract ( )   PDF (183KB) ( )  
    Related Articles | Metrics
    Ten compounds have been obtained for the first time from the roots of Bupleurum yunchowense Shan et Y. Li, On the basis of chemical and spectroscopic analysis (UV, IR, MS.1HNMR, 13CNMR) they are identified asα-spinasterol, octacosanoic acid, adonitol, isorhamnetin-3-O-rutinoside, rutin, α-spinasteyl-β-D-glucoside, saikosaponin-b2, saikosaponin-α, 2"-O-acetyl saikosa-ponin-b2, 3''-O-acetylsaikosaponin-b2.
    Synthesis of Alkyl N,N'-Dialkyl Carbamoyl-phosphonamidates
    Chen Ruyu, Cheng Leifeng
    1988, 9(11):  1190-1192. 
    Asbtract ( )   PDF (216KB) ( )  
    Related Articles | Metrics
    Ten new entitled compounds have been prepared and their structures were confirmed. Preliminary bioassays indicated that they have herbicidal and fungicidal activities.
    Resolution of Cis-Chrysanthemic Acid With Quinine
    Tang Chuchi, Chen Junran, LI Gungren, Shao Ruilian, Jin Guiyu
    1988, 9(11):  1193-1195. 
    Asbtract ( )   PDF (197KB) ( )  
    Related Articles | Metrics
    (±)-Cis-chrysanthemic acid 1 was resolved into (+)-1R-1 and(-)-1S-1 via the diastereomeric salts by using quinine as resolution reagent. Thus,the mixture of equimolar amount of (±)-1 and quinine was heated in EtOH-H2O(4:1 V/V) to have been solved cmpletely and was allowed to standundisturbed in a water bath at, 43~35℃ for 12~16h. The fine needles obtainedwere recrystallized.
    Investigation on the Temperature Effect in the Polarographic Processes (Ⅲ)——The Determination of the Rate Constant and Activation Energy of Catalytic Reactions
    Chen Hongyuan, Fang Huiqun, Cheng Yufei, Rolf Neeb
    1988, 9(11):  1196-1198. 
    Asbtract ( )   PDF (217KB) ( )  
    Related Articles | Metrics
    A new, simple method for the determination of the rate constant, kf, and the activation energy, Eα, of catalytic reaction on the basis of the dependence of catalytic current on the temperature has been developed. The experimental results for several catalytic systems are in a good agreement with those obtained by other methods in the literatures. The new value of kf for the system of Mo(Ⅵ)-H2SO4-NH4NO3 was determined. The Eα for these studied systems were reported.
    Studies on the Absorption Spectra for Cytochrome C
    Yang Pin, Yang Binsheng
    1988, 9(11):  1199-1202. 
    Asbtract ( )   PDF (306KB) ( )  
    Related Articles | Metrics
    In this paper the effect of acidity of solution and some molecules on cytochrome C(cyt.C) have been observed respectively. Reduced cyt.Cis stable in alkali media, but it is gradually transfered into oxidized cyt.Cafter about one hour below pH5.8 The heteroatomic molecules, e.g. thiophene, indole, pyrrole, pyridine, mecaptoethanol, couldj transform oxidized cyt.Cinto reduced cyt.C,while imidazol and tetrahydrofuran transform reduced ones reversely. The change of cyt. Cdon't take place in the presence of N3-, SCN-, HCOO-, F-.
    Catalytically Oxidative Coupling of Methane over Li-Ln-MgO Oxides
    Bi Yingli, Zhen Kaiji, Jiang Yulao, Yang Xiangguang, Han Yuli
    1988, 9(11):  1203-1205. 
    Asbtract ( )   PDF (238KB) ( )  
    Related Articles | Metrics
    The catalytically oxidative coupling of methane was investigated over Li-Ln-MgO(Ln, La, Ce, Pr, Nd, Sm) in a temperature range of 893~973Kunder atomspheric precsure in a continuous cusitz flew fixed bed reactor. It was found that Li-Ce-MgOoxide catalyst possesses a relative highest selectivity and corresponding higher yield for C2 formation(average value of 30min).
Special Issues
More...
Download
More...
Links
More...