Loading...
CJCU

Table of Content

    24 September 1991, Volume 12 Issue 9
    Previous Issue    Next Issue
    Articles
    Studies on the Synthesis and Structure of a New Type of Aluminophosphate Molecular Sieves (AlPO4-CJ2)
    Yu Long, Pang Wen-qin
    1991, 12(9):  1137-1140. 
    Asbtract ( )   PDF (309KB) ( )  
    Related Articles | Metrics
    Anovel aluminophosphate molecular sieve (A1PO4-CJ2) was synthesized hydrothermally from the system of Al2O3-P2O5-hexamethylenetetramine-H2O, and a large single crystal was obtained. It was proved that AIPO4-CJ2hasan open framework, and has 8-Tring channels along the direction (100) and (001) respectively determined by X-ray diffraction, four-circle X-ray diffraction and IRspectrum and that the Al atoms of the framework are located in AlO5(distorted trigonal bipyramid) and AlO5F (distorted octahedron). A model of Al-O-Al linkage is formed by bridge of the oxygen atom of water molecules.
    Synthesis and Magnetic Properties of Copper (Ⅱ) Complexes with Pyridine N-oxide-2-ylmethylidenedithiocarbazates as Ligands
    Gou Shao-hua, You Xiao-zeng, Xu Zheng, Zhu Duo-lin, Yu Yun-peng
    1991, 12(9):  1141-1144. 
    Asbtract ( )   PDF (320KB) ( )  
    Related Articles | Metrics
    Aseries of copper(Ⅱ) complexes with pyridine N-oxide-2-ylmethylidenedithiocarbazates as ligands were synthesized and characterized by IR, electronic spectra and magnetic moments at room temperature. Variable temperature magnetic susceptibilities (3-300 K) of four complexes were measured and fitted with the Bleaney-Bowers dimer equation by considering the magnetic interaction among molecules. The fitting results show the existence of intramolecular ferromagnetic interactions and intermolecular anti-ferromagnetic interactions in these copper(Ⅱ) complexes.
    The Molecular and Electronic Structure of Cluster Compound [Cr2CoO(O2CCH3)6Py3] ·Py
    Yu Xiu-fen, Jiang Ya-qi, Li Jun-qian
    1991, 12(9):  1145-1148. 
    Asbtract ( )   PDF (314KB) ( )  
    Related Articles | Metrics
    The titled compound was prepared and its molecular structure was determined. Space group Cc, a=2. 1933(2) nm, 6=1. 2447(3) nm, c=1. 5912(5) nm, β=117. 02(2), K=3. 8679 nm3, Z=4, Dc=1. 46 g/cm3, and R=0. 036 for 2849 reflections with I>3σ(I). To study the bonding character of the skeleton its electronic structure was calculated by EHMO method. The results indicate that although there is not M-M bond, it is important for molecular stability to form four-centre d-pπ bond beween M and μ3-O besides a bond.
    Studies on Synthesis and Crystal Structure of the Mo(0) Binuclear Complexes (Et4N)2[(CO)4Mo(μ-S)2MS2](M=Mo,W)
    Yu Pei-hua, Xiao Tai, Zhuang Bo-tao
    1991, 12(9):  1149-1152. 
    Asbtract ( )   PDF (307KB) ( )  
    Related Articles | Metrics
    The Mo(0)binuclear complexes (Et4N)2[(CO)4Mo(μ-S)2MoS2](Ⅰ)and (Et<N)2[(CO)4Mo(μ-S)2WS2](Ⅱ) were synthesised with a new method, and their crystalline structures were determined by X-ray crystallography. Ⅰ and Ⅱ Crystallize in the orthogonal system and the space group is Pbcm with a=1. 8403(2), b=1.1963(1), c=1. 3482(1) nm, Z=4, R=0. 042 for Iand with α=1. 8453(2), 6=1.2004(2), c=1. 3482(3) nm, Z=4, R=0. 032 for I. The structures of the anions of Ⅰ and Ⅱ are all composed of both an octahedron around the Mo(0) atom and a tetrahedron with the Mo (Ⅵ) or W(Ⅵ) atom in the center by sharing an edge which is the line between the two bridged sulfur atoms. The bond distance of Mo-Mo is 0. 2992(2) nm and Mo-Wis 0. 3033(8) nm, and the bimetallic center Mo(μ-S)2M(M=Mo, W) is planar. It was found in the Fourier IRspectrum of complex Ⅱ that the absorption band of Mo(0)-Sb is v=424. 3 cm-1.
    Studies on the Stability of Some Organoammonium Decatungstates in Solutions
    Yue Bin, Zhu Si-san, Song Yuan, Wang Qi-lan, Gu Yi-dong
    1991, 12(9):  1153-1156. 
    Asbtract ( )   PDF (312KB) ( )  
    Related Articles | Metrics
    The stabilities of three organoammonium decatungstates in several organic solvents and water were examined. The converted products in some solvents were also identified by means of element analyses, UV and IRabsorption spectra. What have been done above will be helpful to the further studies of their photochromism.
    Studies on the Complexes of Transition Metal with 2-[(2,4-Dichlorophenylamino)carbonyl]-benzoic Acids
    Shi Jin-chao, Yang Bing-qin, Ma Huai-rang, Wang Zhang-fa
    1991, 12(9):  1157-1159. 
    Asbtract ( )   PDF (238KB) ( )  
    Related Articles | Metrics
    The complexes of transition metal with 2-[(2,4-dichlorophenylamino) carbonyl]-benzoic acids were prepared and characterized by elemental analysis,thermogravimetry, infrared and electronic spectra as well as nuclear magnetic resonance. The results show that the coordination occurs by means of two oxygen atoms, one is from the amido, and the other from the hydoxyl in the carboxylate. The complexes of Cu(I) are square planar, but the others are octahedral structures with only a small distortion. Some of the ligand field parameters were evaluated.
    The Proton Transfer Across Water/Oil Interface Facilitatited by Neutral lonophore ETH1616
    Wang Er-kang, Wu Ya-ying, Qi De-yao, Yu Ze-mu
    1991, 12(9):  1160-1163. 
    Asbtract ( )   PDF (292KB) ( )  
    Related Articles | Metrics
    The proton transfer across the water/ nitrobenzene interface facilitated by ionophore ETH1616(N,N-bis heptyl-ethyldiamide) has been investigated by chronopotentiometry with linear current scanning and cyclic voltammetry. The stability constant of the complex and the diffusion coefficient of ionophore ETH1616in the nitrobenzene phase have been estimated, respectively. The mechanism of the proton transfer has been discussed.
    Spectral Characterization of Preconccntration and Stripping Mechanism of Tri-n-octylphosphine Oxide Modified Electrodes
    Jin Li-tong, Tong Wei, Fang Yu-zhi
    1991, 12(9):  1164-1166. 
    Asbtract ( )   PDF (235KB) ( )  
    Related Articles | Metrics
    The preconcentration and stripping processes of cathodic stripping voltammetric determination of Eu(Ⅲ) by using tri-n-octylphosphine oxide modified electrode in a ternary complex system are characterized in this report by infrared and X-ray photoelectron spectroscopies. It states that the preconcentration efficiency is enhanced greatly with the formation of the ternary complex, Eu(TTA)3(TOPO)2, during the preconcentration process of the modified electrode. During the complexing preconcentration process, not all the tri-n-octylphosphine oxides at the electrode surface have the complex activity. Only those sites with the complex activity and favorable steric arrangement circumstance take part in the preconcentration complex reaction. It is shown that the Eu in the ternary complex at the electrode surface is reduced during the cathodic stripping process.
    Studies on the Determination of Trace Amount of Lead with Lucigenin-H2O2-Pb(Ⅱ) Chemiluminescence System by Flow Injection Analysis (FIA)
    Li Guang-hao, Yu Zhen-an
    1991, 12(9):  1167-1169. 
    Asbtract ( )   PDF (229KB) ( )  
    Related Articles | Metrics
    Anew method is reported for the determination of trace amount of Pb(Ⅱ) with Lucigenin-H2O2-Pb(Ⅱ) chemiluminescence system by F1A. The detection limit of the method is 0. 5 μg/mLfor Pb(Ⅱ). If the range of Pb(Ⅱ) concentration for the working curves was 0-100 μg/mL, the peak height was found to be linearly dependent on the concentration of Pb(Ⅱ). The relative standard deviation is less than 1.9%. The method was applied to determination of Pb(Ⅱ) in waste water with satisfactory results.
    The Determination of Methamidophos by Exponential Gradient Loaded Column Gas Chromatography
    Chen Yi-wen, Zhang Zhi-hua, Yu Qian
    1991, 12(9):  1170-1172. 
    Asbtract ( )   PDF (221KB) ( )  
    Related Articles | Metrics
    Exponential gradient loaded column gas chromatographic method for the determination of methamidophos is described. In this method, chromatogaphic characteristic of a column packed with 0. 34%, 0. 49% and 0. 7% DEGSon glass beads MDMCS(80-100 mesh) was studied. The results show that the retention time was shortened and the column temperature was lowered in comparison with other methods. The lower limit of detection was 0. 97 ug.
    Potentiometric Determination of Trace of Silver Based on the Carbon Paste Electrode
    Pei Jian-hong, Zhong Jia-yue, Yin Quan
    1991, 12(9):  1173-1174. 
    Asbtract ( )   PDF (180KB) ( )  
    Related Articles | Metrics
    The carbon paste electrode was used as the trace silver potential sensor. This electrode system exhibits a linear response over the range of 5× 10-7-1×10-2mol/L for trace of silver, and according to 1UPACrecommendation, the detection limit of this electrode system is 1 × 10-7mol/L. The electrode has been used to determine trace of silver in electroplate solution and fix solution with good results.
    Studies on Catalytic Stripping Voltammetry of Trace Amount of Copper (Ⅱ) at an Electrode Chemically Modified with Oxine-Containing Carbon Paste
    Qiao Wen-jian, Ding Hong
    1991, 12(9):  1175-1177. 
    Asbtract ( )   PDF (249KB) ( )  
    Related Articles | Metrics
    The oxine modified electrode was prepared on the basis of carbon paste and the process is rapid and simple. The catalytic stripping voltammetric characteristic of Cu(Ⅱ) on the modified electrode is studied and the method has been appiled to the determination of trace Cu (Ⅱ), and there is a good linear relationship between the concentration of Cu(Ⅱ) and peak height in the range of 1. 5×10-9to 1. 5×10-6mol/L for Cu(Ⅱ) we have detected the copper content in hair and blood with satisfactory results. Moreover, the reaction mechanism of the modified electrode is discussed and it is considered that the improvement of sensitivity and selection of the modified electrode is dependent on the complexing-absorbing property of electrode surface and a sensitive catalytic hydrogen wave produced.
    Potentiostatic Activation of the Carbon Fiber Electrode and Its Application to the Determination of Metal Ions
    Peng Tu-zhi, Yang Zhong-ping, Lu Rong-shan
    1991, 12(9):  1178-1180. 
    Asbtract ( )   PDF (348KB) ( )  
    Related Articles | Metrics
    Carbon fiber electrodes subjected to potentiostatic pretreatment exhibit electrochemical activity. The activated electrodes can be used for determining metal ions directly without mercury film. The pretreated carbon fiber electrode shows a high sensitivity and good reproducibility in stripping voltammetry. The detection limits for Cd, Pb and Bi are 0. 5, 0. 2 and 0. 8 ng/mLrespectively. The activation conditions are optimized and activation mechanism is explored by means of cyclic voltammetry, scanning electron microscopy and X-ray photoelectron spectroscopy.
    The Determination of Trace Molybdenum with 5'-Nitro-Salicyl Fluorone in the Presence of Triton X-100 by Fluorescence Quenching Method
    Wang Xiao-min, Chen Shen, Pan Jiao-mai
    1991, 12(9):  1181-1182. 
    Asbtract ( )   PDF (2168KB) ( )  
    Related Articles | Metrics
    This paper deals with a new fluorometric reagent, 5'-nitro-salicylfluorone (5'-N-SAF) which was synthesized by ourselves used to determinate molybdenum in the presence of Triton X-l00. Anew fluorometric method has been developed and the optimum conditions have been established. The linear range is 0-0. 6 μg/mLand the minimum detectable amount is 4×10-3μg/mL.
    Determination of Complex Formation Constants Between Solid Aromatic Hydrocarbons and Silver Ion
    Piao Cheng-yun, Zheng Jin-zhi, Yin Qi-fan, Wang Gui-fen, Cui Sheng-yun
    1991, 12(9):  1183-1185. 
    Asbtract ( )   PDF (223KB) ( )  
    Related Articles | Metrics
    The preparation of saturated liquid aromatic hydrocarbons by circulation of solute vapour and the solubility of liquid aromatic hydrocarbons in silver nitrate solution are reported. Complex formation constants between those liquid aromatic hydrocarbons and silver ion were calculated from solubilities.The preparation apparatus was designed for preparing saturated vapour of solid aromatic hydrocarbons and we determined the solubilities of naphthalene, phenanthrene, anthracene biphenyl, p-dichlorobenzene in silver nitrate solution and calculated the complex formation costants between those substances and silver ion.
    Synthesis of Tributyltin Alkyloxy-and Aryloxy(thio-)acetates and Their Herbicidal Activity
    Xie Qing-lan, Li Jing, Jia Zhi-fen, Zhang Zhao-gui, Hu Jin-min
    1991, 12(9):  1186-1189. 
    Asbtract ( )   PDF (323KB) ( )  
    Related Articles | Metrics
    Thirteen tributyltin alkyloxy-and aryloxy(thio)acetates were synthesized by the reaction of TBTO and relative acids. All compounds were analyzed for IR spectra, 1H, 13C and 119Sn NMR. The results show that they may be five-coordinated organotin compounds with bridging carboxyl group and tin intermolecular. The pesticidal activity of some compounds have been determined and they display a good herbicidal activity.
    Studies on the Derivatives of S-[(1,2,4-Triazol-1-yl)-Aryl (or Alkyl) Car bonyl] Methyl Phosphorodithioate
    Shi Yan-nian, Fang Jian-xin, Xu Liang-zhong
    1991, 12(9):  1190-1194. 
    Asbtract ( )   PDF (356KB) ( )  
    Related Articles | Metrics
    Twelve new triazol organic phosphorus compounds with the general formular (Ⅰ) have been prepared. The structures of these compounds have been confirmed by elemental analysis, and IR, 1HNMR and MS analysis.(R=Me,Et,i-Pr; R=Me3C,C6H5,p-MeOCfiH,i,p-ClC6H4.)The vibrational frequency of the P=S group occurs in the rang 640-680 cm-1. The frequencies of P=S group is primarily dependent upon the electronegativity of the substituent groups.It has been proved by 1HNMR that the substituent groups linked with phosphorus atom spinning are not free because of the steric effect of the substituent groups.The results from the primary biological test show that some of these compounds have the activities of fungicide, herbicide or plant growth regulator.
    Studies on Synthesis of Carboxylphenoxyacetic Acid Derivatives Using Liquid-Liquid Phase Transfer Catalysis
    Chen Ji-chou, Zhao Wen-zhi, Yang Su-you, Wang Xiu-chun
    1991, 12(9):  1195-1199. 
    Asbtract ( )   PDF (344KB) ( )  
    Related Articles | Metrics
    Nineteen new aryl carboaryloxyphenoxyacetates and nineteen new carboarylami-dophenoxyacetanilides was synthesized by reaction of chloroformylphenoxyacetic acid chloride with phenols and arylamines using liquid-liquid phase transfer catalysis. Their promoting effect on wheat growth were observed preliminary.
    A Study of the Addition Reaction Between 4-Oxo-pente-2-nal and Thioacetic Acid
    Wang Jian-hua, Fan Feng-ge
    1991, 12(9):  1200-1203. 
    Asbtract ( )   PDF (177KB) ( )  
    Related Articles | Metrics
    The addition reaction of 4-oxo-pente-2-nal or its acetal, which was obtained by hydrolysis of 2-methyl-2,5-dimethoxy-2,5-dihydrofuran, with thioacetic acid and the subsequent cyclization of the 2-thioacetyl or 3-thioacetyl pentenal under different conditions gave β-thioacetyl-furan, β-thioacetylthiophene and β-thioacetylpyrrole derivatives. α-Methyl-β-mercaptofurans, α-methyl-β-mcrcaptothiophenes andα-methyl-β-mercaptopyrroles could be prepared by this method.
    Separation, Preparation and Identification of Tetraphenyl-phenylpentaphenylphenyldiethoxysilicane
    Wang Ji-shun, Guan Jia-rui, Chen Jian-hua, Zhang Xiao-jing
    1991, 12(9):  1204-1206. 
    Asbtract ( )   PDF (2224KB) ( )  
    Related Articles | Metrics
    The paper reports the separation and preparation of tetraphenylphenylpentaphenyl-phenyldiethoxysilicane by HPLC. The structure of compound is identified by 1R, NMR and MS. The by-products in the synthetic process were also analysed and discussed.
    Studies on the Synthesis of Amino Acids (Ⅷ)--Condensation of Ethyl N-ethoxycarbonylmethylimidate and Aromatic Aldehydes
    Rong Ya-jing, Shi Yao-zeng, Lu Wan-fang, Hu Hong-wen
    1991, 12(9):  1207-1209. 
    Asbtract ( )   PDF (203KB) ( )  
    Related Articles | Metrics
    The condensation of ethyl N-ethoxycarbonylmethylimidate (1) and aromatic aldehydes (2) in the presence of sodium ethoxide is described. The products, Z/E-a-benzamidocimmamates, are important intermediates in the synthesis of amino acids.
    Preparation of 2-Methyl-4-mercaptofuran Derivatives
    Wang Jian-hua, Fan Feng-ge, Shi Zhen
    1991, 12(9):  1210-1211. 
    Asbtract ( )   PDF (176KB) ( )  
    Related Articles | Metrics
    This paper reports the preparation of twelve 2-methyl-4-mercaptofuran derivatives with 2-methyl-4-thioacetyl furan as raw material. The compounds Ⅰa-e,Ⅱa,Ⅱcand Ⅱe-f, are new compounds.
    A Quantum Chemical Study on Thermal Elimination of N-Substituted Ethyl Pyrazole
    Hong San-guo, Fu Xiao-yuan
    1991, 12(9):  1212-1215. 
    Asbtract ( )   PDF (286KB) ( )  
    Related Articles | Metrics
    MINDO/ 3 SCF calculations have been carried out to study the thermal elimination of N-substituted ethyl pyrazole;H3C3N2CH2CH2X→H4C3N2+H2C=CHX (I,X=H;Ⅰ, X=CH3;Ⅲ,X=F)Aconcerted reaction involving a five membered ring transition state(TS) was found. The results obtained show that there is a weak influence on the reactivity by the substituents on ft carbon of the ethyl group. The hyperconjugation of the methyl group, and the strong electronegativity and the weak conjugation of the fluorine atom stabilize the corresponding TSrespectively, the activation barriers of these two reactions are lower than that of the non-substituted reactent.
    Studies on Nafion-Pt Hydrophobic Gas Diffusing Electrode (Ⅱ)--CO Oxidation and its Stability
    Yan He-qing, Lu Jun-tao, Wang E-feng
    1991, 12(9):  1216-1219. 
    Asbtract ( )   PDF (325KB) ( )  
    Related Articles | Metrics
    The current of COoxidation at the Nafion-Pt hydrophobic electrode is higher in 0.5 mol/L H2SO4than in 1mol/L NaOH and decays with time over a few hours till reaching a steady state. These observation can be explained in terms of the ion-selectivity of Nafion and the Limited transport rate of water across the membrane.
    Surface Enhanced Raman Scattering of Malachite Green on Silver Film from Chemical Method (Ⅰ)
    Zhang Jian-hua, Liang Ying-qiu
    1991, 12(9):  1220-1224. 
    Asbtract ( )   PDF (493KB) ( )  
    Related Articles | Metrics
    A SERS-active silver film was obtained by chemical reduction method on optic polished quartz slides. Studies of the scanning electron microscopy on the silver film indicated that the Ag particles were uniform and the size distribution ranged from 50 nm to 140 nm which suited for SERS measurement. SERS spectra of the malachite green with an enhancement factor 2. 3 ×10-5were measured. The limit of detection was found to be 10-10mol/L. The adsorption geometry was deduced by comparing the SERSspectra with the raman spectra on the solid malachite green or malachite green aqueous solution. There was a phase transition of the silver film from "being flat" to "being perpendicular" when the bulk concentration of the malachite green changed from 1. 0×10-7mol/Lto.1. 0× 10-6mol/L.
    Surface Enhanced Raman Scattering of Malachite Green on Silver Film From Chemical Method (Ⅱ)
    Zhang Jian-hua, Liang Ying-qiu
    1991, 12(9):  1225-1228. 
    Asbtract ( )   PDF (429KB) ( )  
    Related Articles | Metrics
    We measured the surface enhanced Raman spectra (SERS) of the malachite green on silver film deposited on optic polished quartz slides by using chemical method. The effects of the excitation wavelength, electrolyte (NaCl) concentration and pHon the SERS were investigated. The results indicate that the relative intensities for some bands depended upon the excitation wavelength; Inorganic anion(Cl-) not only enhanced the SERSintensities, but also changed the relative intensities of the SERSsensitive bands; The SERS intensities increased with pHfrom 1-7 and reached maximum value at pH=7, and then decreased. The possible origin for the phenomena was discussed.
    Studies on the Electronic Energy Band Structure and Conducting Mechanism for Doped Polyaniline
    Wang Hui-zhong, Wang Rong-shun, Zhao Cheng-da, Huang Zhong-hao, Tang Jin-song, Wang Bao-chen, Wang Fo-song
    1991, 12(9):  1229-1233. 
    Asbtract ( )   PDF (371KB) ( )  
    Related Articles | Metrics
    In this paper, series of models of the proton-doped polyaniline were calculated by using EHMO-CO method. The theoretically calculated energy band structure is in very good agreement with the experimental results on spectrum and is more satisfactory for explaining the conductive mechanism of the doped polyaniline. The theoretical study shows that the charged carriers are polarons in the doped polyaniline.
    Studies on Standard pH Reference Values in Mixed Solvents--The System of KHPh(0. 05 mol/kg)+KCl+Isopropanol+Water from 278. 15 to318. 15 K
    Jiang Xiang-shun, Liang Chun-yu, Qin Mei-jie
    1991, 12(9):  1234-1237. 
    Asbtract ( )   PDF (322KB) ( )  
    Related Articles | Metrics
    pHstandard reference values, pH(RVS), for 0. 05 mol/kg potassium hydrogen phthalate buffer solutions in 10%, 14. 93% and 20% isopropanol+ water mixed solvents at temperatures from 278. 15 to 318. 15 Kare determined from reversible electromotive potential measurements of the cell without a liquid junction. On the basis of Pitzer's theory, a new method for determining the activity coefficients of each ion in the solutions is proposed. The second thermodynamic dissociation constants of v-phthalic acid are calculated, and the thermodynamic quantities of the second dissociation are calculated and the results are discussed.
    A Quantum Chemistry Study of Fast Atom Bomb Positive Ion in Mass Spectrum of Glyccrol
    Quo Chun-xiao, Meng Qing-bo, Liu Shu-ying
    1991, 12(9):  1238-1241. 
    Asbtract ( )   PDF (482KB) ( )  
    Related Articles | Metrics
    MNDO method has been applied to compute protorration energy, heat of formation, struc turc parameters and decomposition barrics of metastable ions for the prominent positive ions in the FABmass spectrum of glyccroi. The mechanism of quasi-molecuar ion of glycerol tossing two H2O mole-cales have been studied. The product ion C3H5O+is predicted to possess two different structures.
    The Quantum Chemistry Studies on Electrochemical Oxidation-Reduction of FeTPP and CoTPP
    Guo Chun-xiao, Huang Chu-bao, Guo Fu-chun, Hou Dong-yan
    1991, 12(9):  1242-1245. 
    Asbtract ( )   PDF (318KB) ( )  
    Related Articles | Metrics
    The electronic structures of electrochemical reduction reaction in different steps for FeTPP and CoTPP have been studied by restricted CNDO/2 method. The results show that in the electrochemical reduction reaction of FeTPP the first electron interacts with d orbitals of the central Fe atom, whereas the second electron interacts with p orbitals of four nitrogen atoms, and eight carbon atoms connected with the four nitrogen atoms respectively. However, all the two electrons of CoTPPinteract with d orbitals of the central Co atom separately. This is in good agreement with the results obtained in an in-situ UVspectroscopic experiment.
    The Catalysis of Aluminium Titanium Alloy Bromide in the Isomerization Reaction of Straight Chain Alkane
    Song De-ying, Yan De-yi, Zhu Huai-yong, Zhang Wei, Lu Jing-cai, Gui Ming-de, Wang Gen-shi
    1991, 12(9):  1246-1250. 
    Asbtract ( )   PDF (2455KB) ( )  
    Related Articles | Metrics
    The synthesis of the aluminium titanium alloy bromide and its catalysis of the isomerizatu reaction of alkane were studied for the first time. The isomerization reaction of n-pentane catalyzed by aluminium titanium alloy bromide was discussed in detail. Its kinetic equation is InC/C0=-0. 50 t at 0℃.The apparent activation energy is 26. 3 kJ/mol. The kinetic curves of the isomerization reaction of n-hexane, n-heptane, n-octane over the catalyst in different solvents at different temperatures were determined and drawn to afford a theoretical foundation for industrial application.
    Electrocatalytic Reduction of Dinitrogen
    Wu Ye-fan, Wang Shui-ju, Hong Liang, Lin Guo-dong, Yuan You-zhu, Cai Qi-rui
    1991, 12(9):  1251-1252. 
    Asbtract ( )   PDF (162KB) ( )  
    Related Articles | Metrics
    Dinitrogen can be reduced to ammonia under the condition of controlled potential electrolysis in the presence of the chemically modified electrode containing vanadium surface complex in 0. 02 moI/L KCl/HOAc(pH4. 0) aqueous solution. The maximum current efficiency in the electrochemical reduction is 15% for the reduction of dinitrogen under the controlled potential electrolysis conditions (at -0.8 V vs SCE).
    Studies on Defects in Vitreous SiO2Doped with TiO2by ESCA
    Zhou Yu-qing, Li Jia-qiang, Hou Lan-tian
    1991, 12(9):  1253-1255. 
    Asbtract ( )   PDF (222KB) ( )  
    Related Articles | Metrics
    The photoelectron spectra of Ois, Sip,Ti2, of non-crystal TiO2-SiO2with various TiO2contents were obtained by ESCA. The relationship between their chemical shifts and the network defects, the titanium coordination structure was discussed. With increasing the content of TiO2up to about 7wt%, the quantity of the defects tends to saturation and the number of the Ti atoms in substitution state increases, comparing with that mainly in interstitial state at lower content of TiO2.
    Deviation from the Mass Action Law Caused by Nonequilibrium Property of Chemical Reactions
    Li Xiao-ping
    1991, 12(9):  1256-1258. 
    Asbtract ( )   PDF (2193KB) ( )  
    Related Articles | Metrics
    The effects of nonequilibrium property on the chemical kinetics of a simple open chemical model are investigated. The results obtained show that the chemical kinetics of reactions in the nonequilibrium states may be obviously different from that in the equilibrium states. The results may have important implications to the development of the theory of chemical kinetics.
    A Quantum Chemistry Study on the Influence of Hydrogen Bond on the Acidity of Salicylic Acid
    Su Zhong-min, Huang Zong-hao, He Yue-hua, Gao Feng
    1991, 12(9):  1259-1261. 
    Asbtract ( )   PDF (224KB) ( )  
    Related Articles | Metrics
    The influence of intramolecular hydrogen bond and solvent water on the ionic dissociation of salicylic acid was studied by quantum chemistry CNDO/2 method. As a result of this study, we have drawn the total energy curve of the acid dissociating process and the figure of the mechanism of hydrogen migration. By discussing the charge distribution and analyzing the computing results with the energy decomposition method, we have explained the influence of hydrogen bond on the acidity of salicylic acid at the molecule and electron level.
    Studies on Multilayered Langmuir-Blodgett Film of Crown Ether Containing Biphenyl Mesomorphic Groups
    Zhang Xi, Lin Zhi-hong, Wang Zhi-qiang, Shen Jia-cong
    1991, 12(9):  1262-1264. 
    Asbtract ( )   PDF (224KB) ( )  
    Related Articles | Metrics
    We report here the first successful preparation of Langmuir-Blodgett films of erown ether containing biphenyl groups. The fluorescence spectra of CEBB in CHCl3have been studied In detail. From the dependence of concentration on the fluorescence intensity, it was shown that the intramolecular excimer can be formed in dense solution. The fluorescence spectra of LBfilms show that all the molecules exist in the form of associated state. Examination of the LB films by X-ray experiment indicated that the layer structure was well organized with smooth interlayer surfaces and with each layer having the same uniform thickness of 2. 6 nm.
    The Effect of Macromolecule Additives on the Saccharification of Cellulase
    Feng Yan, Jin Xiao-hong, Li Zeng-ji, Cao Shu-gui, Cheng Yu-hua
    1991, 12(9):  1265-1267. 
    Asbtract ( )   PDF (226KB) ( )  
    Related Articles | Metrics
    The effect of several synthesized macromolecules on the saccharification of cellulase was researched. Strong polypositive ion (PⅠ, P Ⅱ), moderately polynegative ion (PⅢ) macromolecules could enhance the saccharification. But strong polynegative ion (PⅣ) macromolecules could not. PⅠ (1. 3×10-1mol/L), PE (1. 3×10-3mol/L) and PI (1. 3×10-2mol/L) made the saccharification of cellulase increased by 190%, 45%, 75% respectively. The mechanism of enhancement of saccharification by macromolecules was researched from the view point--the effects of macro-molecules on the activity of each component of cellulase and the adsorption amount of enzyme on the substrate.
    Synthesis of Poly-γ-[N,N-bis(β-ethylmercaptoethyl)amino] Propyl Silsesquioxane Rhodium Complex and Its Catalytic Hydrosilylation Behavior
    Chen Yuan-yin, Hu Xu-bo, Lu Xue-ran
    1991, 12(9):  1268-1271. 
    Asbtract ( )   PDF (2446KB) ( )  
    Related Articles | Metrics
    The title complex was synthesized from N,N-bis(β-ethylmercaptoethyl)y-(triethoxysilyl) propylamine by hydrolysis of the monomer or cohydrolysis of it with dodecyltriethoxysilane or phenyl-propyltriethoxysilane and immobilized on fumed silica, respectively, followed by reacting with rhodium chloride under Ar atmosphere in acetone. They are efficient catalysts for the hydrosilylation of olefins by triethoxysilane. The turnover number was more than 100 000 in one run in individual case. The plausible structure pattern of the complex is suggested. The influences of the nature of substrate, reaction temperature, the amount of complex used on the catalytic activity, as well as their recovery and reused property were investigated.
    Studies on the Behavior of Urease Immobilized by Cross-Linked Polyvinyl Alcohol Gel
    Pan Ji-lun, Chen Chang-zhi, Yu Yao-ting
    1991, 12(9):  1272-1274. 
    Asbtract ( )   PDF (270KB) ( )  
    Related Articles | Metrics
    The present paper reports the immobilization of urease on "cross-linked" PVAgel containing a high amount of water. Experimented results show that the immobilized urease on PVAgel has a high activity yield(79%). The immobilized urease activity is 63 mg/g (half hour at 37℃). The repeated determination with substrate showed no detectable loss in enzymatic activity. The determination of the activity within 26days at 37℃ showed a 26% loss of enzymatic activity.
    Studies on Polymer Secondary Battery Employing Polyacenic Semiconductor
    Zhang Xi-yan, Xie De-min, Wang Rong-shun, Fu Yu-jie, Wang Chun-guo, Zhao Cheng-da, Li Chang-zhi, Wang Bao-chen
    1991, 12(9):  1275-1277. 
    Asbtract ( )   PDF (335KB) ( )  
    Related Articles | Metrics
    Polymer secondary batteries employing polyacenic semiconductor (PAS) as the cathode which is prepared from phenol-formaldehyde resin by pyrolytic process have been assembled,by using Li as an anode and the solution of Imol/L LiClO4in PCas the electrolyte. These batteries show an excellent reversibility for electrochemical doping-undoping process and the charge-discharge cycles under 1 mAh have reached 300 times and the energy density is 162 Wh/kg. We believe that the PASbattery promises to be applied to conductive polymers in practice.
Special Issues
More...
Download
More...
Links
More...