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Table of Content

    24 February 1995, Volume 16 Issue 2
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    Articles
    Studies on Tailed Metalloporphyrin Coordination Compounds(Ⅲ)──The Synthesis and Properties of an Imidazolyl Tailed Porphyrin and Its Iron(Ⅲ) Coordination Compound
    HUANG Jin-wang, LIU Jun-Feng, JIAO Xiang-Dong, JI Liang-Nian
    1995, 16(2):  163-167. 
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    Aimidazolyl tailed porphyrin,5-[o-(1-imidazolyl) butoxy]phenyl-10,15,20-triphenyl porphyrin(o-ImBPTPP),and its iron(Ⅲ) coordination compound(Fe(Ⅲ)(o-ImBPTPP)Cl) were synthesized and identified by elementary analysis and mass spectrometry.The structures were confirmed by IR、1HNMR and UV-vis spectrometries.The coordinations of Fe(Ⅲ)(o-ImBPTPP) Cl with some nitrogeous ligands were studied.Usually Fe(Ⅲ)(o-ImBPTPP)Cl formed low-spin six-coordinate adducts with nitrogeous,but it could form a stable high-spin five-coordinate adduct with imidazole in benzene when the concentration of imidazole was lower.
    Hydrothermal Synthesis and Characterization of K3Sb3P2O14·5H2O
    AN Yong-Lh, FENG Shou-Hua, XU Yi-Hua, XU Ru-Ren, YUE Yong
    1995, 16(2):  168-171. 
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    The compound K3Sb3P2O14·5H2O was first synthesized by hydrothermal crystallization,and characterized by XRD,31PMAS NMR,IR,DTA-TG and so on.The compound crystallizes in the rhombohedral system with a=0.71377 nm,b=0.71377 nm,c=3.08047 nm,α=90°,β=90°,γ=120°,and has a layered structure.The potassium ions are situated between the covalent layers.
    Synthesis,Characterization and Crystal Structure Studies on a Mixed Ligand Complex of Aquatris(3-phenyl-4-benzoyl-5-isoxazolone)(Ethanol) Europium Monohydrate[Eu(PBI)3(C2H5OH)(H2O)]·H2O
    WEI Zhao-Jie, LI Biao-Guo, HUANG Chun-Hui, S. Umetani, M. Matsui
    1995, 16(2):  172-175. 
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    The[Eu(PBI)3(C2H5OH)(H2O)]·H2O was systhesized by reacting Eu2O3with highly acidic β-diketone 3-phenyl-4-benzoyl-5-isoxazolone(HPBI) in C2H5OH under heating.The X-ray single crystal structure analysis shows that the crystal is monoclinic with space group P21/a and the unit cell parameters are as follows:a=1.5586(9) nm,b=2.1297(7) nm,c=1.604(1) nm,β=117.97(5)°,V=4.703(9) nm3,Z=4.The central ion Eu3+is eight coordinated by six oxygen atoms from three β-diketone,one from water and one from C2H5OH molecule.The coordination polyhedron takes bicapped triangular prism arrangement.The Eu-Oaverage bond length is 0.2391(4) nm.The average distance of O-Owithin a β-diketone is 0.2808 nm which is larger than those for other β-diketones.
    Synthesis and Crystal Structrue of H8DOTP and Its Erbium Complex
    WANG Xiao-Qing, YANG Wei-Chun, JIN Tian-Zhu, XU Guang-Xian, MA Zhe-Sheng
    1995, 16(2):  176-178. 
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    The ligand 1,4,7,100-tetraazacyclodoecane-1,4,7,10-tetrakis(methylenephosphonic acid),abbreviated to H8DOTP,was synthesized and its crystal structure was determined by X-ray diffraction method.The crystal is monoclinic with space group P2/a.The cell parameters are a=1.8113(4) nm,b=1.4452(3) nm,c=1.8215(4)nm,β=97.64(3)°,V=4.7660(18) nm3,Z=4,Dc=1.528g/cm3.The final Ris 0.078,Rw=0.083.And H8DOTP complex with erbium was synthesized in aqueous solution.
    Synthesis and Characterization of a New Type of Zirconium Phosphate Crystal from Alcohol System
    ZHAO Yu-E, SON Tian-You, XU Jia-Ning, XU Ru-Ren
    1995, 16(2):  179-180. 
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    Anew type of zirconium phosphate crystal was synthesized hydrothermally from non-aquous system containing fluoride ions with ethylenediamine as the template agent.The product was characterized by several physicochemical methods.The XRD analysis shows that ZrPO-Acrystal is a new compound with unique structure;the SEM photograph exhibits that the appearance of ZrPO-Acrystal is flaky;the IRspectrum proves that there are the vibrating peaks of tetrahedral PO4in ZrPO-Acrystal.
    Syntheses and Magnetism of Linear Trinuclear Copper(Ⅱ) Complxes with Strong Antiferromagnetic Interaction
    MIAO Ming-Ming, LIAO Dai-Zheng, JIANG Zong-Hui, WANG Geng-Lin
    1995, 16(2):  181-183. 
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    Four novel trinucleat copper(Ⅱ) complexes were synthesized,namely{[Cu(pba)] [Cu(L)]2}(ClO4)2,where pba denotes 1,3-propylenebis(oxamato) and Lis 2,2'-bipyridyl(bpy),4,4'-dimthyl-2,2'-bipyridyl(Me2bpy),1,10-phenanthroline(phen) or 5-nitro-1,10-phenanthroline(NO2-phen).Based on IR,elemantry analyses,conductivity measurements and electronic spectra,these complexes were proposed to have oxamido-bridged structures and to consist of three copper(Ⅱ) ions in which each copper(Ⅱ) ion has a square planar envionment.The temperature dependence of the magnetic susceptibility of[Cu(pba)][Cu (NO2-phen)]2(ClO4)2 has been studied in the range from 4.1 to 300 K,giving the exchange interval J=-124 cm-1.The result reveals the operation of a strong antiferromagnetic spinexchange interaction between the adjacent copper ions.
    The Application of DTPA-Eu3+Complex to DNA Hybridization Assay
    CI Yun-Xiang, CHEN Yong, LI Yuan-Zong, CNANG Wen-Bao
    1995, 16(2):  184-187. 
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    Here we reports a new detection method for λDNA through the system of target DNA/Bio-DNA probe/Avidin/ Bio-BSA(TG)-DTPA-Eu3+.Avidin was used as a bridge to link hybrids and Bio-BSA-DTPA-Eu3+or Bio-TG-DTPA-Eu3+.The carrier proteins were labeled with both biotin and DTPA-Eu3+.The analytical conditions were optimized.The influences of transamination of DNA probe by ethylene diamine and 1,6-hexane diamine as well as carrier proteins on hybridization assay were compared.The method has a high sensitivity(1pg/well) with good reproducibility(RSD=5.7%,n=6).
    Determination of Manganese(Ⅱ)by Fiber Optic Kinetic Method with FIA and Binary Fluorescent Complex Indicator Manganese-Binary Fluorescent Complex-Sodium Periodate
    WANG Jun-Feng, ZHANG Zhu-Jun
    1995, 16(2):  188-191. 
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    Fiber optic has been coupled in the kinetic spectrofluorimetric apparatus with FIA.The feasibility of binary fluorescent complex as a new type of kinetic indicator has been investigated.Anew indicating reaction using8-hydroxyquinoline-5-sulfate aluminium as kinetic fluorescent indicator in Mn-H2QS-NaIO4system has been developed to determine trace manganese(Ⅱ).The limit of detection is 1 ng/mL and the linear calibration curve is obtained in the range of 5-200 ng/mL manganese(Ⅱ) level and the sampling speed is 45 samples per hour.The proposed method has been applied to determine manganese in teas,mineral and waters.
    Information Loss and Remedy in Two Dimensional Convolution
    ZHUO Zong-Liang, SHEN Wei-Yang
    1995, 16(2):  192-196. 
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    Amethod has been proposed for the remedy of the information loss at the marginal belts in 2D-convolution.Theoretical study shows that the 2D-convolution integers for noncentral point evaluation can be found just by using linear combination of those for the central points.New integers acquired ensure that the information loss would not happen while doing derivation with 2D-experimental data array.The related items concerning the symmetry of these integers and the importance of identifying all convolution parameters were also discussed.
    Studies on Binary Gas Solid Adsorption(Ⅱ)─Acetone-n-Hexane,Toluene-n-Hexane,Benzene-n-Hexane,n-Pentane-n-Hexane Adsorptions on Silica Gel
    DAI Min-Guang, MIAO Rui-Ping, YANG Su
    1995, 16(2):  197-200. 
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    In this paper,the binary adsorption isotherms of acetone-n-hexane,toluene-n-hexane,benzene-n-hexane and n-pentane-n-hexane on silica gel are presented.The adsorption isotherms for pure gases are also obtained.It will be seen from the experimental results that the adsorption behavior of the vapor mixtures can be predicted from the isotherms of pure components.The extent of predominant adsorption can be predicted from the first layer adsorption heat of the individual pure component.
    Studies on Adsorption Isotherms of Proteins on Hydrophobic Surface
    BIANL Liu-Jiao, GENG Xin-Du
    1995, 16(2):  201-205. 
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    Adsorption isotherms of proteins on hydrophobic surface were measured by frontal chromatography.It was found the adsorption isotherms of lysozyme and bovine serum albumin to be linear and those of cytochrome-c,myoglobin,insulin,α-amylase,and ovalbumin to be convex.With the comparison among stoichiometric displacement model of adsorption(SDM-A),the Langmuir model,the BET equation,and the Jovanovic equation,the first one was found to fit two kinds of adsorption isotherms mentioned above well,the second one could only be used to describe the latter well,while the last two equations could not be used to describe anyone of them well.For ovalbumin,the linear parameters of the SDM-A and the Langmuir model were found to have certain regularity with the changes in the concentrations of ammonium sulfacte.
    FT-Raman Spectroscopy of Triplex DNA d(CT)8·d(AG)8·d(C+T)8
    FANG Ye, WANG Ting, BAI Chun-Li, WEI Ying, TANG You-Qi, KAN Lou-Sing
    1995, 16(2):  206-207. 
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    The conformation of triplex DNAd(CT)8·d(AG)8·d(C+T)8in solution has been investigated by near infrared FT-Raman spectroscopy at 1064 nm. Results clearly revealed that almost all of the sugar pukers of the triplex fall in the normal range for the Bgenus.However,a strong band at 1266 cm-1suggested that the C3'-endo/anti protonated cytosines in the third strand can not be eliminated.
    Induction and Calculation of Absorbance for Optical Wave-Guide Cell──With Small Rectangular Cross-Section Incident Light Beam
    LIU Zhan-Jun, WANG Yun-Fei
    1995, 16(2):  208-210. 
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    With small rectangular cross-section incident light beam(SRCSILB) focused by a flat-convex lens and all the lights propagating through a straight-line-type optical wave-guide cell(OWGC) by total reflection within its meridian planes,an expression was induced for the calculation of absorbance Aof OWGC.According to this expression and a number of given parameters,numerical calculations were conducted and Fig.3 was drawn.Very good linearities of the dependence of Aon the concentration Cof specimens and the length l of the OWGC are obtained for all the linear lines.These results indicate again that Wei Lei et al.and Dasgupta's conclusion of nonlinearities between A and Cor l is not unconditionally tenable.
    The Chemical Modification of Tryptophan Residues in Polygalacturonase
    WANG Hong-Mei, LIU Jia-Li, YANG Ping, LIU Lan-Ying
    1995, 16(2):  211-215. 
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    The tryptophan residues in polygalacturonase(PG2) had been modified by N-bromosuccinimide(NBS) to study the relationship between the Trp residues and the activity of the enzyme.The results indicate that there are six Trp residues in PG2.Four of them locate in the interior and the other two locate on the surface of the enzyme molecule.One of the Trp residues,which is on the surface of PG2,is essential for the activity of the enzyme and locates at the active site of the enzyme.The spectra of circular dichroism(CD) and fluorescence of PG2 are changed after treatment with NBS.
    Synthesis of Chiral Copper(Ⅱ)Complexes and Their Application in Asymmetric Cyclopropanation of Olefins
    CHEN Guang-Ming, CHEN Fu-Heng, ZHOU Chang-Hai
    1995, 16(2):  216-219. 
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    Sixteen chiral copper(Ⅱ) complexes derived from(R)-(+)-or(S)-(-)-2,2'-diamino-1,1'-binaphthyl(DABN) were synthsized.All the complexes were used as enentio selective catalysts in the asymmetric cyclopropanation reactions of 1,1-diphenylethylene, styrene and 2,5-dimethyl-2,4-hexadiene.It was found that the more effective catalysts are related to complexes with ligands prepared from optically active DABNand salicylaldehyde or 2-hydoxy-1-naphthylaldehyde.
    Structural Determination of Arylhydrazono-6-methyl-α,γ-Pyronone and Study of Its Ring-Closure Reaction
    LI Zheng-Ming, ZOU Xia-Juan, YAO En-Yun, ZHANG Dian-Kun, WANG Ru-Ji
    1995, 16(2):  220-224. 
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    3-Aryl hydrazono-6-methyl-α,γ-pyronone is an important intermediate for the synthesis of a series of dihydro-pyridazones.This intermediate was separated and purified for the first time.By X-ray diffraction method,its crystalline structure was elucidated.NMR monitoring technique was applied to investigate the following ring-closure reaction under acidic and basic conditions.It was proposed that there underwent a mechanism as first by a lactone ring-opening then followed by a dehydrating cyclization reaction.
    Synthesis and Characterization of Several Electron Donor-Acceptor Amphiphilic Compounds
    CAO Yun-Wei, CHAI Siang-Dong, CHEN Si-Guang, JIANG Yue-Shun, LI Tie-Jin
    1995, 16(2):  225-229. 
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    Three electron donor-acceptor amphiphilic compounds with barbituric acid were designed and synthesized.All the compounds have not been reported so far and their structures have been confirmed by elementary analysis,1H NMR and IR.The reactions of aldehydes with barbituric acid were studied,and it is found that,in the basic media,the reaction rates were immeasurably slow,however,in the neutral media,the rates were very fast.The relationship among reaction activities of aldehydes,the NMR chemical shifts of their hydrogens connected with carbonyl group,and their carbonyl groups characteristic infrared absorption,were also studied.
    Caohuoside-C from the Aerial Parts of Epimedium Koreanum Nakai
    LI Wen-Kui, XIAO Pei-Gen, LIAO Mao-Chuan, ZHANG Ru-Yi
    1995, 16(2):  230-233. 
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    Anew flavonol glycoside,named caohuoside-C(Ⅰ),was isolated from the aerial parts of Epimedium koreanum Nakai in addition to three known compounds.By means of IR,UV,FAB-MS,EI-MS,1HNMR,13CNMR and Chemical evidences,the structure of caohuoside-C was determined as 5,7,3'-trihydroxyl-4'-methoxyl-8-prenylflavonol-3-O-α-L-rhamnopyranoside.The known compounds were identified as icariside C1(Ⅱ),epimedokoreanoside-Ⅰ(Ⅲ) and desmethylicaritin(Ⅳ).
    Synthesis of Some Novel Sulfonylureas Containing Thiadiazole and Their Biological Activity
    YANG Xin-Ling, CHEN Fu-Heng
    1995, 16(2):  234-236. 
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    Twenty-five novel sulfonylureas containing thiadiazole have been synthesized by treating 2-amino-5-subthiadiazole with sulfonylisocynate.Tlieir structures were confirmed by IR,1HNMR and elementary analysis.The preliminary biological test shows that compounds 1,2,5 and 22 are effective against broadleaf plants at 2.25 kg/ha in pre-or post-emergence;10,22,25 also exhibit certain fungicidal activity against puccinia Recondita at 0.125%in vivo.
    Synthesis and Configurational Determination of 11-Chloroartemisinin
    LU De-Wen, LI Ying
    1995, 16(2):  237-238. 
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    Chloroartemisinin,a new derivative of artemisinin,was prepared by treating 11α-hydroxyartemisinin with SOCl2/Pyr with retention of configuration.11-Chloro atom having α orientation was determinated by NMR technique and molecular mechanic calculation.
    Influence of Twisted Conformation on Fluorescent Properties of 1,3-Diphenyl Pyrazoline Derivatives
    YANG Guo-Qiang, WU Shi-Kang
    1995, 16(2):  239-244. 
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    The fluorescent properties of 1,3-diphenyl pyrazoline(DPP) and 1-phenyl-3-(4-nitrophenyl) pyrazoline(PNP) were studied at room temperature(293 K) and 77 Krespectively.In non-polar solvents the intensity of the fluorescence of DPP at 77K was much lower than that at room temperature and PNP showed no emission at 77K.These phenomena indicate that it is very important for luminescent properties of the compounds that in excited state the conformation of the molecules relaxes from a planar to a twisted one.The studies of the modified compounds,inhibiting the rotation of the phenyl groups at different positions in DPP and PNP,verified the expression above.From experimental results it can also be concluded that there are different key twisting positions to form luminescent conformation between DPP and PNP.It is very important for forming the luminescent state of DPP to twist the phenyl at N-1 position,in contrast with that,twisted phenyl at C-3 is more important for establishing the luminescent state in PNP.
    SERS Studies on the Orientation and Structure of Absorbed Water at Ag Electrodes──Effects of Electrode Potential and NaClO4Concentrations
    ZOU Shou-Zhong, ZHANG Yun-Hong, CHEN Yan-Xia, TIAN Zhong-Qun
    1995, 16(2):  245-251. 
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    Combining with the special procedure of roughing surface and the difference spectra technique,one can obtain the surface enhanced Raman scattering(SERS) spectra of water adsorbed on Ag electrodes in a wide potential range(-0.7--2.0V) from NaClO4solutions with various concentrations(0.1-8.0 mol/L).It has been shown that the absorbed water has much higher ordered structure than that in the bulk solutions.The concentration of NaClO4has much less effect on water molecules adsorbed on the surface,especially in the relatively negative potential region,in comparison with that in the bulk solutions.With changing the potential form-2.0 Vto-0.9 V,the adsorbed water is reoriented from one hydrogen ending to the surface to two hydrogens then to the oxygen ending.The concentration effect of ClO4-ions on the reorientation of the absorbed water is discussed in detail.
    A Study of the Spectrum Properties and the Photovoltage Response of Nanocrystalline Nd2O3
    CUI Yi, WANG De-Jun, WANG Bao-Hui, LI Tie-Jin, DONG Xiang-Ting, HONG Guang-Yan
    1995, 16(2):  252-255. 
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    The diffuse reflectance spectra of nanocrystalline Nd2O3were measured in the ultraviolet-visible region.It is found that the part of f→f transition bands were widened and red-shift occurred.The absorption tail-band in the region from 300 to 550 nm was assigned to the O2p→Nd4ftransition.The behavior of light-induced charge transfer and photovoltaic properties of nanocrystalline Nd2O3were studied by the surface photovoltage spectroscopy(SPS) and electric field modulating SPStechniques.The SPSresponse shows two peaks at 330 nm(P1) and 380 nm(P2) in the UV-Vis range.The spectral features observed can be explained in terms of charge transfer and interband transition.
    A Theoretical Prediction of Electronic Structures and Spectra of B32and Its Endohedral Complexes
    LI Zhi-Ru, WEI Jia-You, ZHANG Xin-Tong, FENG Ji-Kang
    1995, 16(2):  256-259. 
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    On the basis of INDO/CI method,the electronic structures and spectra of B32and its endohedral complexes were studied,and compared with its conjugated polyhedron of C60and its endohedral complexes.
    Theoretical Analyses of Clusters Cun,Agn,Aun(n=2,3,4)
    LIU Han-Xing, ZNANG Han-Lin, OUYANG Shi-Xi, YUAN Run-Zhang
    1995, 16(2):  260-264. 
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    Atomic orbital interactions of clusters Cun,Agn,Aun(n=2,3,4) were analyzed with DV-Xamethod The results showed that the interactions vary with the geometry of clusters.The ionization potentials of clusters are investigated by using the transition-state procedure,and the calculating results for Agnare in agreement with the experimental values,however,there are some deviations between them for Aun,due to the larger relativistic effect of Aun.
    The Jahn-Teller Distortion and Spectroscopic Property of C602-Singlets
    TENG Qi-Wen, FENG Ji-Kang, WEI Jia-You, SUN Jia-Zhong
    1995, 16(2):  265-269. 
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    The geometry optimizations of C602-singlets have been performed by using the method of INDO series,and three different kinds of symmetry D5d、D3dand D2hof C602-have been abtained.These illustrate that the Jahn-Teller distortions have happened for C602-singlets.There are 4 kinds of different atoms and 7 kinds of bonds in C602-(D5d);6 kinds of different atoms and 10 kinds of bonds in C602-(D3d) as well as 9 kinds of different atoms and 15 kinds of bonds in C602-(D2h).The extra negative charges are distributed near the equator mostly.On the basis of these geometries,the electronic spectra of C602-have been calculated,it is shown that the ground state of C602-shound be triplet.
    Studies on the Promoter Effect of ZrO2in Pd/Al2O3Catalysts
    ZHOU Ren-Xian, ZHENG Xiao-Ming, GE Yu-Ping
    1995, 16(2):  270-274. 
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    The catalytic activity of COoxidation on Pd/Al2O3catalysts doped with ZrO2was examined in different atomspheres.The interaction of Zr-Al,the effect of property of the desorption-renewal of oxygen specie,on the catalysts was investigated by XRD,TPR and TPD-MS techniques.The results showed that suitable amount of ZrO2would promote the desorption and renewal of oxygen species on catalysts.Thus,it increased the activities of COoxidation and the reaction between H2and O2on the catalysts.The catalyst doped with ZrO2showed the best reactivity.
    Studies on the Perovskite-Type Mixed Catalysts of Titanium System for Oxidative Coupling of Methane─The Influence of Calcination Temperature
    ZHAO Zhen, YUAN Song-Yue, YU Zuo-Long
    1995, 16(2):  275-278. 
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    The correlations of the calcination temperature,structure and catalytic activity for the oxidative coupling of methane on the LiLa0.5Ti0.5O2+λcatalysts whose main phase and major active phase is Perovskite-type ternary complex oxide LaTi1-yLiyO3-λhave been studied.The surface and bulk structures of the catalysts were characterized by means of XRD,XPS,IR,BET and so on.The results cleary indicated that the effect of calcination temperature on the activity for the oxidative coupling of methane is twofold.On one hand, it is favorable for Li+substitution for Ti3+to enter into the lattice of LaTiO3and produce more oxygen vacancies in which active oxygens are formed;however,excessively high calcination temperature make the amount of Li+substitution for Ti3+lower,due to a little change of structure or phases for the catalyst.On the other hand,the conversion of CH4drops because of the decrease of surface area,when the calcination temperature is raised.
    The Excited-States Spectra(S1→Sn,T1→Tn) and Reverse Saturable Absorption of C60
    FENG Ji-Kang, LI Jun, FEI Hao-Sheng, CHE Yan-Long, SUN Jia-Zhong
    1995, 16(2):  279-283. 
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    The electronic structure,ground and excited-states spectra (S0→Sn,S1→Sn,T1→Tn),excited-state molecular dynamics and micromechanism of reverse saturable absorption of C60molecule were studied by using INDO/CI method.Adynamic model has been used for resolving rate equations.It is concluded that the necessary condition of reverse saturable absorption is the absorption cross section of exited state must be larger than that of ground state for LASER.This condition is satisfied when the wavelength of incident LASER is equal to 532 nm for C60,so the character of reverse saturable absorption appears.
    Unimolecular Dissociation Reactions of Doubly Charged Ions[C12H12N2O]2+and[C12H12N2S]2+in Gas Phase
    REN Da, JIA Wei-Ping, LI Zhi-Li, LIU Shu-Ying
    1995, 16(2):  284-286. 
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    The unimolecular dissociation reactions of doubly charged ions were reported,which resulted from a tandem mass spectrometer and a reversed geometry double focusing mass spectrometer by electron impact.Mass analyzed ion kinetic energy spectrometry(MIKES) was used to obtain the kinetic energy releases in charge separation reactions of doubly charged ions.The intercharge distances between the two charges at transition states can be calculated from the kinetic energy releases.Transition structures of unimolecular dissociation reactions were infered from MIKES and MS/MS.
    Viscosity Behavior of Sodium Linear Alkyl Benzenesulfonate Solution with High Concentration Containing Inorganic Salts and Urea
    WANG Jing-He
    1995, 16(2):  287-289. 
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    The thickening efficiency of inorganic salt is remarkable and has a maximum viscosity value for concentrated sodium straight-chain alkyl benzenesulfonate(SLABS) solution.The maximum viscosity values which various salts can reach are markedly different.The interaction between salt and micelle solution is mainly the electrostatic effects.The thickening ability of salt is limited by the activity product between the hydrated individual ion(of surfactant) and the metal ion of salt.Urea diminishes markedly the viscosity values of concentrated SLABS solutions.When using(1/2) Na2SO4as a thickening agent,the higher the concentrations of urea are,the lower the maximum viscosity values are and the higher the concentrations of salt corresponding to the values.These are interpreted in term of forming the individual of partial urea adduct between urea and the hydrated individual,and diminishing SLABS actual concentration of the equilibria between the hydrated individual and micelle.
    Oxidative Coupling of Methane Over CaF2/Sm2O3Catalysts
    ZHOU Shui-Qin, LONG Rui-Qiang, HUANG Ya-Ping, WAN Hui-Lin, TSAI Khi-Rui
    1995, 16(2):  290-292. 
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    The results showed that,with the addition of CaF2to Sm2O3,the catalytic properties for OCM were apparently improved.XRD analysis of the fresh catalysts revealed the existence of SmOF in 20%-80% CaF2/Sm2O3XPS and IR spectra of O2-pre adsorbed CaF2/Sm2O3samples taken at room temperature indicated the presence of O2-and O2-species. O2-species could also be detected over 20%CaF2/Sm2O3at 500℃ in situ IRspectroscopy,but it vanished over the Sm2O3at the same temperature.
    The Influences of Anions on the Photoreduction and Electroredox Properties of Viologen Compounds
    FENG Min-Hui, LIU Wei-Qu, LIANG Zhao-Xi
    1995, 16(2):  293-295. 
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    Aseries of viologen compounds with different anions have been synthesized and the influences of anions on the photoreduction,electroredox and chemical reduction of viologen compounds have been investigated. Only the photoreduction of viologen compounds in PVA matrix markedly varied with different anions.Polyviologens and viologens with fluoride anion have particular photoreduction and electroredox behavior.
    Photoconductivity of Fullerene-doped Photoconductors
    XU Zhu-De, CHEN Wan-Xi, LENG Yong-Jun, XU Xiao-Ping, LI Wen-Zhu, WANG Mang
    1995, 16(2):  296-298. 
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    Photoconducting films of polyvinylcarbazole(PVK) and zinc phthalocyanine(ZnPc) doped with fullerenes(a mixture of C60and C70) were prepared and their photoconductive properties were measured.Surface potential measurements showed that the photosensitivity of fullerene-doped photoreceptors is remarkably enhnced,compared to that of the undoped materials.The photoconduction mechanism and the role of fullerene in the charge generation process are roughly discussed.
    Application of Molecular Orbital Graph Theory(Ⅲ)──Evaluation of Eπby Cleavage Bond Method
    ZHAO Hong-Gang, YANG Kai-Hai, WANG Chang-Sheng, ZNANG Ji-Cai, CAO Yang
    1995, 16(2):  299-301. 
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    On the basis of molecular orbital graph theory,the basic formulae for graph algebra are proposed in this paper,which are used to evaluated the moment μ2land to establish the cleavage bond formula for obtaining the total π energy.These formulae demonstrate the topological relationship between μ2l and Eπ with the molecular network.
    Miscibility and Morphology of AB/C-Type Block Copolymer/Homopolymer Blends(Ⅲ)──Enthalpy Relaxation of the Blends
    HUANG Tian-Zi, XIE Jing-Wei, JIANG Ming
    1995, 16(2):  302-306. 
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    Aseries of blends composed of block copolymer PI-b-PMMA and modified polystyrene PS(OH) with different contents of hydroxyl-containing units has been prepared and studied by DSC and TEM.The enthalpy relaxation method has been used to the blends.Physical aging below Tg gives rise to two separated enthlpy recovery peaks associated with PMMA blocks and PS(OH) respectively for the blends with lower(0 and 1.0 mol%) hydroxyl contents.while the blends with higher(1.7 and 5.0 mol%) hydroxyl contents show only one transition.This conclusion is in good accordance with that from TEM observation.Besides,for the blends,a substantial broadening of Tgis observed,which can be explained by"the segment-density gradient model"proposed by Jiang et al.
    Deformation Steps in Oriented Ultrahigh Molecular Weight Polyethylene Gel Films
    ZHU Qing-Ren, QI Ron-Rong, HONG Kun-Lun, LU-Fei, ZHOU Gui-En, CHEN Yun-Kai
    1995, 16(2):  307-311. 
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    The structural changes of UHMWPE gel-films during drawing had been studied by X-ray diffraction,X-ray plate camera,SEM.The orientation processes were discussed by sing chain dynamic simulation.It had been found that there are three stages in the orienton process.In the initial stage of orientation,the lamellae in the gel-films rotate and/or slided with the b-axis became paralleling to the drawing direction while unfolding of the chain began.When the draw ratio large enough,most of the chains were extended to form microfibrillar chain bundle but only two dimensional period along the draw direction exit.
    Synthesis of Ultra High Molecular Weight Polystyrene by Bulk Solution Polymerization
    YANG Di-Lun, JHN Jing, MA Zhen-Tian, LIU You-Cheng
    1995, 16(2):  312-314. 
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    The synthesis of ultra high molecular weight polystyrene was carried out by bulk solution polymerization which was initiated with diethy1 2,3-dicyano-2,3-bisphenyl succinate in ethylbenzene.The results indicate that the initiator behaved mildly and that the molecular weight of the polystyrene product increased along with the reaction time.
    TEM Studies on Morphologies of PS/LDPE Blends
    XU Shi-Ai, JIHANG Ming, SHEN Jing-Shu
    1995, 16(2):  315-316. 
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    In this communication we report the result of TEM observations for low density polyethylene(LDPE)/PS blends.The success of the work is based on a proper use of a solution-melt procedure for TEM specimen preparation.In this procedure,not only the multiphase structure of the blends,hut also the details of the crystalline morphology of LDPE in the blends have been successfully revealed.
    Blue Luminescent Device Utilizing 2-(4-Biphenylyl)-5-(4-t-butylphenyl)-1-3,4-oxadiazole as Hole Blocking Layer
    MA Yu-Guang, WU Jun, XUE Shan-Hua, HUANG Jing-Shong, LIU Xiao-Dong, TIAN Wen-Jing, LIU Shi-Yong, SHEN Jia-Cong
    1995, 16(2):  317-318. 
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    By placing an hole blocking layer between the polymer and the metallic electrode,we have improved efficiencies for blue light-emitting diodes fabricated with 1,1,4,4-tetraphenyl-1,3-butadiene doped poly(N-vinyl carbazole)as the emitting layer and with aluminum and ITO as the electron and hole injecting electrodes.The bilayer device yields bright blue emission having intensity of 300cd/m2in the same case the device without hole limiting layer have luminance only 44cd/m2.
    The Study on Thermally Stimulated Current of Polystyrene and Its Alloy
    SHENG Jing, LI Feng-Kui, HU Jing
    1995, 16(2):  319-321. 
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    The relaxations of polystyrene,ethylene-propylene diene monomer,grafting copolymer of ethylene-propylene diene monomer with styerne were measured by thermally stimulated current.The effect of sample thickness on relaxation polystyrene was discussed.The relaxation on alloy of polystyrene with ethylene-propylene diene monomer and its grafting copolymer was studied by thermally stimulated current and inverse gas chromatography,and the correlation between two phases in alloy was discussed.
    Studies on Isothermal Crystallization Kinetics of Poly(ether ether ketone ketone)
    CHEN Yan, WANG Jun-Zuo, CAO Jun-Kui, NA Hui, WU Zhong-Wen
    1995, 16(2):  322-324. 
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    Astudy has been made for the crystallization behaviour of poly(ether ether ketone ketone) by DSC which was used to monitor the crystallization process from the melt and rubbery state.The Avrami equation was used to analyze the isothermal crystallization kinetics of PEEKK.The Avrami constant n is about 2 for the crystallization process from the melt and 1.5 from the rubbery state.The activation energies for PEEKK are 953.7 kJ/mol for crystallization from the melt and 932.6kJ/mol for crystallization from the rubbery state.The kinetic parameter kgis 851.5K
    Studies on Thixotropy of PVC Plastisol with Ultrafine Calcium Carbonate Filled
    CHEN Fei-Yue, XU Yong, HU Li-Ming
    1995, 16(2):  325-327. 
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    The time-dependent,shear rate-dependent and viscoelastic behavior of PVC plastisol with ultrafine calcium carbonate filled were obtained with time sweep,step-shear-rate sweep and frequency sweep methods.Thixotropic properties of this plastisol were characterized.From the experimental results,this plastisol is a viscoelastic thixotropic system with yield stress,and calcium carbonate improves the thixotropic properties after surface modification.
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