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Table of Content

    24 December 1995, Volume 16 Issue 12
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    Articles
    Effect of Ni Addition on Crystal Structure and Properties of LaFeO3
    LI Li-Ping, WEI Quan, XU Xiao-Chun, YU Jiang-Peng, KANG Zhi-Jian, SU Wen-Hui
    1995, 16(12):  1827-1830. 
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    Pervoskite oxides of LaFe1-xNixO3(x=0.1～0.6)were prepared by the solid state reaction method.The XRD, IRand Mossbauer measurements show that the samples are all in single phase except for x=0.4; their structures transform from orthorhombic to rhomhombic at x=0. 5.The frequency of Fe(Ni)-Ostretching vibration shifts to a high frequency about 20 cm-1with a structure transformation. Fe ions are all in high spin state of +3 valence and Ni ions incorporated in lattice are in +3 valence.
    Calculation of a Ternary Phase Diagram for the Nonsolvent-Solvent-Polymer System
    HAO Ji-Hua, WANG Shi-Chang
    1995, 16(12):  1831-1836. 
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    A new generalized form of the Flory-Huggins equation was suggested, in which the interaction parameters in the binary mixture should be kept as the concentration of the binary mixture in the ternary system.The new equationts for the calculation of Binodal and Spinodal curves in the ternary system were developed. The effect of a polymer/solvent interaction parameter concentration dependence in the new and old forms was discussed.The results showed that the new Flory-Huggins equation is a more generalized form. The ternary phase diagrams calculated in the new and old forms were obviously different.The ternary phase diagrams of CA-acetone-water and CA-dioxane-water approach to the results obtained from the measurements.
    Synthesis, Crystal Structure and Characterization of [Cu2(C6H5COO)4(C3H4N2S)2]
    WANG Dong-Mei, YANG Rui-Na, JIN Dou-Man, LUO Bao-Sheng, CHEN Liao-Rong
    1995, 16(12):  1837-1840. 
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    The metallic copper powder was oxidized by dibenzoyl peroxide in the presence of 2-aminothiazol in acetone resulting in the copper (Ⅱ) complex [Cu2 (C6H5COO)4(C3H4N2S)2].Crystal of the complex belongs to monoclinic, space group P21/n,with the crystal cell parameters:a = 1.0685 (1)nm, b=1. 9028(6)nm, c=1. 7046 (9) nm:α= γ=90°, β=96. 49(3)°, V= 3.443(4) nm3, Z=4,F(000)=824, Dc=1.5558g/cm3μ=14. 078cm-1, R=0.04821.Rw= 0. 05314.The complex was also characterized by elementary analy ses, IR, X-ray powder diffraction, and TG.
    Crystal and Molecular Structure of m-Aminophenyl Boronic Acid Hydrochloride
    LI Hong-Feng, WANG Xiang-Yun, YANG Qing-Chuan, LIU Yuan-Fang
    1995, 16(12):  1841-1843. 
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    The crystal and molecular structure of m-aminophenyl boronic acid (m-APBA)hydrochloride was determined by single crystal X-ray diffraction.The crystal parameters are as follows:monoclinic,space group P21/c,a=5.193 (3)nm,b=15.802(14) nm, c=10. 307(8)nm, Z=4.Each chloride ion is connected with 4 m-APBAH+ions through three Cl…H…Nhydrogen bonds and a Cl…H…Ohydrogen bond.Its coordination number is 4.The arrangement of m-APBA·HCl molecules within the crystal cell is determined by hydrogen bonding.
    Synthesis,Characterization and Activity of a New Type Layered Microporous Materials──Pillared Anion Clay with Ga-W9-Co3
    ZHANG Ji-Yu, YU Xin-Wu, ZHANG Shu-Yun, HU Chang-Wen, LIANG Zhao-Jun, WANG En-Bo
    1995, 16(12):  1844-1846. 
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    Tungstogallic heteropolyanion trisubstituted with transition metal cobalt was intercalated into ZnAl-NO3 type anion clay by means of hydrothermal ion-exchange for the first time.IR spectra show that Keggin structure of the intercalated hyteropolyanion was kept perfect. Powder X-ray diffraction confirms that the intercalation reaction takes place and the gallery height of intercalated product is 0.99±0.01 nm.Catalytical tests exhibit that the intercalated derivative shows a higher catalytic activity for the formation of DOP.
    Determination of the Neurotransmitter in the Brain Using Composite Polymer Microelectrodes
    PENG Tu-Zhi, YANG Li-Ju, LI Hui-Ping, WANG Guo-Shun, HONG Jia-Qiong
    1995, 16(12):  1847-1851. 
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    A composite polymer carbon fiber electrode modified with Nafion and cellulose acetate is described.The incorporation of ion exchanging polymer to the cellulose acetate domain allows the binding of counterionic reactants, while maintaining the size exclusion discriminative properties of cellulose acetate.In vivo voltammetry,the modified microelectrode inhabits the oxidation of some neurotransmitter metabolites and electroactive compounds,such as DOPAC, 5-HIAA, HVA, AA and UA;and successfully detects the oxidative current of neurotransmitter DA.
    Investigation on the Potentiostatic Polymerization of Low Concentration Aniline
    XIAO Yao-Wu, ZHANG Zu-Xun
    1995, 16(12):  1852-1855. 
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    In this paper, the electrochemical polymerization of low concentration aniline was studied by potentiostatic method.The equation of polymeric current simultaneously controned by diffusion and electrode reaction was derived and verified successfully.Some electrochemical parameters of polymeric reaction, such as aA, k'sand DR, were determined.
    A Study of Glucose Biosensor Based on Immobilization of Glucose Oxidase in Electrochemically Polymerized Poly(3, 3′-diaminobenzidine) Film on Platinized Glassy Carbon Electrode
    ZHANG Zhan-En, DENG Jia-Qi
    1995, 16(12):  1856-1860. 
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    An amperometric glucose biosensor has been developed based on immobilization of GODin electrochemically synthesized poly (3, 3′-diaminobenzidine) (PDAB) film on a platinized glassy carbon electrode(PGCE).The PGCE provides a large apparent surface area ,and GOD entrapped in the of the electrodeposited platinum particles is more stable than on a platinum disc electrode surface. The sensor respeonses to β-D-glucose linearly over a concentration range of 1×10-6to 1×10-3mol/L, and the detection limit is 5. 1×10-7mol/L.At a concentration of 0. 1 mmol/Lglucose, the response current of the sensor is fifty fold higher than that of the sensor prepared with a platinum disc electrode.The response time of the sensor is less than 4 s and the life time is over 6 months.Due to the permselective characteristics of the PDAB film, the effects of electroactive interferents such as ascorbic acid and uric acid, can be significantly reduced.
    A Study of Enhancing Agent in Kinetic Analytical Method(Ⅰ)──A New Mn(Ⅱ)-Potassium Periodate-Nitrilo Triacetic acid -1-(2-pyridylazo)-2-naphthol-Triton X-100 Catalytic Spectrophotometric System
    ZHENG Zhao-Sheng, JING Wei-Guo
    1995, 16(12):  1861-1864. 
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    The indicator reactions for using in kinetic spectrophotometry are necessarily those reactions of homogeneous system.If the reactants or the products are insoluble,these reactions can not be monitored by spectrophotometry.The authors change non-homogeneous systems into analog-homogeneous systems extending the range of selecting indicator reactions of kinetic spectrophotometry by adding surfactant to insoluble reactions with the solubilizing effect of surfactant.Anew catalytic spectrophotometric system for the determination of trace of Mn(Ⅱ)has been developed.This method is based on the catalytic oxidation of 1-2-pyridylazo)-2-naphthol by potassium periodate in the presence of Triton X-100 as a solubilized agent.The detection limit is 3.6×10-3μg/mL,the relative standard deviation is 2.4%,the linear range of determination is 0.1～1.3 μg/25 mLfor Mn(Ⅱ). This method has been successfully used to determine Mn in cereal samples.
    Preconcentration of Silver on Blue Algae Determination by Slurry Graphite Furnace Atomic Absorption Spectrometry
    TANG You-Wen, SONG Jian-Yi, MO Sheng-Jun
    1995, 16(12):  1865-1867. 
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    This work studied the ability and conditions of a pure blue algae to preconcentrate Ag ions of 10-3level from 10～50 mLwater samples. This preconcentration is achieved by mixing 8mg of dried algae with 50 mLof a Ag containing solution and subsequent separation by centrifugation.The algae pellet is then suspended in 1mL of solution and analysed as a slurry by GFAAS.It is shown that after the algae are rinsed with 5%HCl solution, Ag adsorption on the alga is improved.The optimum pHrange of absorption extraction is between 4～6,and the absorption extraction efficiency is 88 ± 2%.After agitated with ultrasonic wave for 4 min,the preconcentration can come up to the highest recovery.
    The Investigation of Data Processing Method for Differential Rate Kinetic Analysis Based on Successive Reactions
    WU Xin-Guo, CAI Ru-Xiu, LIN Zhi-Xin, CHENG Jie-Ke
    1995, 16(12):  1868-1870. 
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    A data processing method for differential rate kinetic analysis based on successive reactions is described.The method is a new kind of proportional equation established by using parameters of two reaction rates which are measured at different period of reaction times.The difference bet en two successive reactions can be exploited more extensively by using this method,and analysis accuracy can be increased.The simultaneous determination of epinephrine and norepinephrin in a mixture is performed by this method,errors found are obviously smaller than those obtained by traditional proportional equation and extension proportional equatin.
    The Application of On-line Standard Addition Method in Microwave Plasma Torch Atomic Emission Spectrometry
    YE Dong-Mei, ZHANG Han-Qi, YU Jing-Lei, Jin Qin-Han
    1995, 16(12):  1871-1873. 
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    In this paper, the probability of eliminating matrix interferences in MPT-AES by on-line standard addition method was studied. The dynamic linear range of Cu and Mg is 0. 05～80 μg/mL.The relative standard deviations of them are 3.02% (1.0 μg/mL, n=7).and 4.47 % (1. 0 μg/mL, n=7) respectively. The results indicated that this method can eliminate matrix interferences and is useful in real sample analysis. The operation of this system is simple.
    Synthesis and Biological Activities of α-(1,2, 4-triazol-1-yl)-α-benzoylketene N,S;N,N;N,O and O,S-acetals
    LI Zheng-Ming, HUANG Zhen-Nian
    1995, 16(12):  1874-1877. 
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    Triazolylbenzoylketene S,S-acetals reacted with substituted phenylamines to give triazolylbenzoylketene N,S-acetals,and reacted with O-phenylenediamines,ethylenediamine, ethanolamines and 1-ethanol-2-thiol to afford the corresponding cyclic N,S;N,N;N,O and O,S-acetals. Their structures were identified by elementary and spectral analyses.The preliminary results of bioassay show that some of triazolylbenzoylketene N,S-acetals have plant-regulatory and fungicidal activities.
    Synthesis and Capillary Column Gas Chromatographic Characterization of Double Benzamide Crown Ether Stationary Phase
    ZENG Zhao-Rui, WANG Jing-Song, WU Cai-Ying, HUANG Zai-Fu, CHENG Chang-Mei
    1995, 16(12):  1878-1882. 
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    A new kind of double benzamide crown ether:1S,2S-1-p-(benzamide)phenyl,2-Benzamide-16-crown-5 was synthesized for use as stationary phases in capillary column gas chromatography.Its structure was confirmed by IR,1H NMR,MS and elemental analysis.The chromatographic characteristics,including column efficiency,thermal stability,polarity and selectivity were studied.Excellent selectivity was obtained for the separations of polar position isomers.The benzamide substituent group on crown ether makes the stationary phase have special selectivity for separating anilines and other basic compounds without derivatization.The factors which affect the separation mechanism, including dipole-dipole interactions,hydrogen bonding forces are discussed.
    Studies on Mixed Trialkyltin Deriatives(Ⅸ)──The Preparation and Biological Activities of Mixed Methyldicyclohexyltin Carboxylates
    YANG Zhi-Qiang, JIANG Li, SHAN Shu-Xiang, XIE Qing-Lan
    1995, 16(12):  1883-1887. 
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    The preparation and characterization of twenty-seven novel mixed methyldicyclohexyltin carboxylates are reported and their biological activities are tested.The compounds(except compound 24) are five coordinate, carboxylate-bridged polymers which dissociate into four coordinate monomers when dissolved in solvent CCl4.The compounds show high acaricidal activities and high in vivo fungicidal activities. There is no obvious regularity for the herbicidal activity.But the results of soil treatment are better than those of stem and leaf treatment.
    Synthesis and Biological Activities of 1-(Substituted Pyrazol-4-yl)-1,2,4-triazoles
    HUANG Zhen-Nian, LI Zheng-Ming
    1995, 16(12):  1888-1891. 
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    Twenty three novel heterocyclic compounds with the following general formula as Follows:R:C6H5,4-ClC6H4,4-CH3OC6H4,4-CH3C6H4,4-BrC6H4,t-C4H9;R1:SCH3,NHAr'(Ar′:4-CH3C6H1,2-CH3OC6H1,4-ClC6H4):R2:C6N5.have been prepared with α-oxo-α-(1,2,4-triazol-1-yl)ketene dithioacetals as intermediates,and their structures were proved by elementary analyses and spectral methods.Preliminary bioassay show that some of these compounds have plant-regulatory activities.
    Caohuoside-E from the Aerial Parts of Epimedium Koreanum Nakai
    LI Wen-Kui, XIAO Pei-Gen, LIAO Mao-Chuan, PAN Jing-Qi, Lü Mu-Jian, ZHANG Ru-Yi
    1995, 16(12):  1892-1895. 
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    A new flavonol glycoside, named caohuoside-E(Ⅰ).was isolated from the aerial parts of Epimedium koreanum Nakai in addition to a known compound. By means of IR,UV, FAB-MS, EI-MS, 1HNMR, 13CNMR,1H-1H COSY,1H-13C COSY,1H-13C long range COSY((HMBC)and chemical. evidence. the structure of caohuoside-Ewas determined as 5, 7-dihydroxy 1 - 4'-methoxyl-8-prenylflavonol-3-O-β-D (-2-O-acetyl)-glucopyranosyl-(1→3)-α-L-(4-O-acetyl )-rhamnopyranosyl-7-O-β-D-glucopyranoside.The known compound (Ⅱ)was identified as β-anhydroicaritin.
    A New Method for the Synthesis of α-Aroyl Ketene Dithioacetals
    FANG Qun-Xin, LIU Qun, HU Yu-Lan, LIN Chun
    1995, 16(12):  1896-1898. 
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    A facile approach to the synthesis of the title compounds 3 are reported in this paper.Assisted by potassium ethylthioate,2-acetyl-2-aroyl ketene dithioacetals 2(prepared easily from aroylacetones 1)were deacetylated to afford the title compounds 3.The reaction conditions from 1 to 3 were very mild and the yields were high.
    Studies on the Syntheses and Biological Activities of O-Saccharidyl-methoxyformylphosphonamidates
    CHEN Xiao-Ru, CHEN Ru-Yu, LI Hui, MAO Li-Juan
    1995, 16(12):  1899-1902. 
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    A series of novel O-saccharidyl-methoxyformylphosphosphonamidates were synthesized,and Arbuzov reaetions of O-saccharidylphosphoramidites with methyl chloroformate and other related reactions were disussed.The structures of the products were determined by 1HNMR,31PNMR, IR and elemental analyses. The results of preliminary biological tests showed that compound 3cpossessed some inhibitory activities against Leukaemia HL-60 cells and liver cancer Bel-7402 cells in vitro,compound 3ahas some antivirus activity against tobacco mosaic virus(TMV).
    Studies on Solid State Condesation Reaction of Aromatic Aldehydes and 3-Methyl-1-phenyl-5-pyrazolone
    LI Xiao-Liu, MA Hong, WANG Yong-Mei, MENG Ji-Ben
    1995, 16(12):  1903-1906. 
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    In this paper,the condensation reactions of substituted benzaldehydes with 3 methyl-1-phenyl-5-pyrazolone at room temperature and with Lewis acid cataly;is in solid state and in melted state were investigated, and two products,4,4'-arylidene-bis-(3-methyl-1-phenyl-5-pyrazolone) 2 and 4-arylidene-3-methyl-1-phenyl-5-pyrazolone l ,were prepared in high yields respectively.This solid state condensation, which had highly reactive selectivity and efficiency, might be a feasible synthetic method. In solution the bis-pyrazolone products 2 would be inverted into the mono-pyrazolone products 1 and pyrazolone,and the equilibrium of the interconversion between the two products 1 and 2 was reached gradually。In solid state the products 2 existed in enolic form, and could coordinated with copper ion easily.
    Binding Effect of Tb3+and Ca2+Ions on Trichosanthin
    LIU Guo-Hong, LI Wen-Lian, HAO Qian, ZHAO Xu, ZHANG Yan, YANG Hong, HUANG Zhong-Li, GAO Gui, DONG Qing-Chu, LI Qing-Shan
    1995, 16(12):  1907-1910. 
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    Tb3+has been used as a fluorescent probe to study the structure of trichosanthin(TCS).The nonradioactive energy transfer from fluorescent active tryptophan(Trp)residue to the bound Tb3+ions take place and the fluorescence of Trp is decreased when Tb3+ions are bound to TCSto replace the Ca2+in it.According to the results of Trp fluorescence and the information given from CDand UVabsorption spectra,we have found that the affinity of Tb3+to TCS is lower than that of Ca2+ions to TCS. Significant change of TCS structure was not observed with the Tb3+ions binding,The microenvironment surrounded Trp and Tyr may be changed slightly with the Tb3+binding.The conformation of Ca2+-free TCS was significantly changed compared with that of native TCS with the Trp residue moving into the interior of TCS molecules。 The Ca2+-binding site in TCS can be maintained partly when the Ca2+is removed from TCSmolecules.
    Studies on the New Packings of High Performance Ion Exchange Chromatography for the Separation of Proteins(Ⅲ)──The Characteristics or the Packings of Cation Exchange Chromatography with Phospbono Group
    CNANG Jian-Hua
    1995, 16(12):  1911-1913. 
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    The packings of cation exchange chromatography with phosphono group and matrix of silica for separation of proteins have been synthsised, and the relationship between their structure and characteristics has been studied.This kind of packings of cation exchange chromatography with medium intensity has a high recovery of the bioactivity of proteins,better separation function and wider applied scope than those of the weak exchange chromatography in the previous papers.The protein load capacity of these packings is about 20 mg/mLfor a sample of Lysozyme by the dynamic load capacity determination method.The use scope of pH is 3.5 to 8. The bioactivity recovery of Lysozyme is 96.7%.It is noteworthy that the hydrophobicity of ligand has an effect on the retention of proteins in IEC. With the increase of the ligand hydrophobicity, the retention of proteins increases. On the other hand, the change of the salt concentration in the mobile phase can change the hydrophobic action between proteins and packings, therefore change the retention of proteins. When two proteins have a great hydrophobic difference and a near retention in the IEC, maybe the change of the salt concentration can get a good separation result.
    Studies on the Asymmetric Synthesis of Pyrrolidine Alkaioids and Related Compounds(Ⅰ)──Synthesis or a Chiral Precursor for Preussin and AHPPA
    HUANG Pei-Qiang, RUAN Yuan-Ping
    1995, 16(12):  1914-1916. 
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    Starting from(S)-malic aicd, the stereoselective synthesis of(4S, 5R)-1,5-dibenzyl-4-benzyloxyl-2-pyrrolidone 9 by two methods was described.The key steps in the synthesis are two asymmetric α-amidoalkylation.The asymmetric α-amidoalkylation was easily achieved either from sulfone 7by Ley's method or from 5 via an addition-reduction proceed to provide 9 in good(4/1 for 7) to excellent(97/3 for 5)trans stereoselectivity.Compound 9 is a chiral precursor for(-)-preussin and(3S,4R )-4-amino-3-hydroxyl-5-phenylpentanoic acid(AHPPA).
    Investigations of Transition States of Porus Silicon
    WANG Bao-Hui, WANG De-Jun, LI Tie-Jin
    1995, 16(12):  1917-1920. 
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    The surface photovoltaic spectroscopy(SPS)and photoluminescence excitation spectroscopy(PLE)were developed for the investigation of transition states of porous silicons,The results indicate that there is a larger band gap in porous silicon than in bulk crystal silicon.Agroup of bands emerge from the energetic position of 300～500 nm,which are dependent on the feature size of the silicon wires in a porous silicon. This experimental finding is in good agreement with the result of calculation of electronic structure. The evidence strongly supports the model of quantum confinement effect.
    Effect of the Performance of Cu/γ-Al2O3Catalyst with the Addition of Ag
    ZHU Bo, LUO Meng-Fei, ZHONG Yi-Fen, LI Bin-Feng, YUAN Xian-Xin, CHEN Ping, WU Hong-Li
    1995, 16(12):  1921-1925. 
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    The BET, XRD, TPRtechniques and the measurement of catalytic activity for benzene and acetone oxidation were used to study the reducibility and activity of Cu/γ-Al2O3, Cu-Ag/γ-Al2O3catalysts.It is found that different TPRprofiles are produced with different metal contents, and different copper species are present on the surface of catalysts.With addition of Ag, there is an obvious displacement between the TPRprofiles of γ-Al2O3-supported Cu-Ag and Cu catalysts, and the activity of catalyst for benzene and acetone oxidation is enhanced. The results showed that the forms of copper species,the reducibility and the catalytic activity of catalysts are affected by the variation of treatment temperature.The addition of Ag, to some extent, can improve the thermal stability of catalyst.
    Investigaions on TPSR-TPD of H2O2,O2and Allyl Chloride Species Adsorbed on Ti-Si Zeolites
    XIA Qing-Hua, GAO Zi
    1995, 16(12):  1926-1929. 
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    In the TPSR-TPD curves of allyl chloride, there are multiple desorption peaks (amount to triplet)on TS-1 zeolites,however there is only a single desorption peak on TiO2/silicalite. After the adsorption of H2O2or molecular O2separately,O(16)atoms are discovered in the desorbed species by MS. It is found that the activity of the samples dissociating molecular O2into atomic O(16)is low. TS-1 zeolites can simultaneously adsorb H2O2and allyl chloride, but the adsorption of both of them on TiO2/silicalite surface is relevant to adsorptive sequence, The order of epoxidation activity is as follows:TS-1(TPAOH)>TS-1 (TPABr+NaOH)>TiO2/silicalite, It is postulated that the higher oxidation activity of Ti-Si zeolites is related to the formation of surface O(16)atoms adsorbed on the zeolites after the adsorption of H2O2.
    Preparation and Properties of So42--TiO2- Hβ-A2O3Catalyst
    WANG Yan-Ji, TANG jing, LI He-Xuan
    1995, 16(12):  1930-1934. 
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    In this paper,So42--TiO2-Hβ-Al2O3solid catalyst was obtained by TiO2modification and(NH4)2SO4treatment of β zeolite. The effect of calcination temperature on the surface composition, acidity and catalytic behavior was observed by XRD, XPS, NH3-TPD,FTIR and chemisorption.The following conclusions were obtained:(1)There was a strong interaction between SO42-and TiO2on the surface of Hβ-Al2O3zeolite at suitable calcination temperature, 550℃.High temperature calcination lowered the surface concentration of (2)Compared to Hβ catalyst,the total number of acid sites and acid strength of TiO2-Hβ-Al2O3were increased greatly, and some increasing acid sites were produced.Lacid sites were predomiant in increasing the number of acid sites.(3)The catalyst showed a high activity on the etherification of propylene and isopropanol to isopropyl ether.With comparison to Hβzeolite catalyst, the propylene conversion was increased from 8.0%to 15.9%and mainly took place on Lacid sites.
    Langmuir-Blodgett Film of a New Biferrocene Derivative Connected by a Conjugated Bridge Group and Its Electrocatalysis
    ZHANG Cheng-Ru, YANG Kong-Zhang, JIN Wen-Rui
    1995, 16(12):  1935-1939. 
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    A new non-amphiphilic biferrocene connected by a conjugated bridge group is synthesized and characterized. The biferrocene is able to form a relatively stable monolayer.As it is mixed with arachidic acid, the mixed monolayer is easily assembled to LB film.The UV-Vis spectra show that the aggregate is formed in the molecules on monolayer.By means of scanning electron microscope, the morphological structure of biferrocene and arachidic acid on LBfilm has been observed, and phase separation in the mixed film can be monitored.The electrochemical reaction of Fe(CN)63-/Fe64-(CN)solution is electrocatalyzed by the mixed LB film on ITO electrode. and electrochemical oxidation reaction.of ascorbic acid can be improved by the mixed film.
    Theoretical Studies on Potential Energy Function and the Isotopic Effects of Vibrational Spectra for Hypofluorous Acid
    XIE Jun-Kai, XIE Dai-Qian, YAN Guo-Sen, Tian An-Min
    1995, 16(12):  1940-1944. 
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    Various isotopic species of hypofluorous acid, HOF, have been a subject of many vibrational spectroscopic studies. The object of these detailed analyses is to obtain accurate spectroscopic data of the various isotopic species of this molecule and to provide information about the structures and the potential energy surface. In this paper, some force constants of hypofluorous acid have been optimized from the comparison between the experimental and the calculated vibrational energy levels,the others have been fixed to the values of the empirical force constants given by Halenon and Ha(J. Chem. Phys. , 1988, 89: 4885).Anew potential energy function is obtained by using the transformation between the force constants and the potential energy parameters of the MORBID form suggested by Jensen(J.Mol.Spectrosc. , 1989, 133: 468. The spectra of the vibrational excited states of the molecules H16OF, H18OF, D16OF, and D18OF have been calculated by using the TRIATOM program,which uses the basis set expansion and is thus strictly variational.In molecules H18OF,D16OF, D18OF, the vibrational frequency shifts relative to HOF specie have been calculated.These calculated shifts are in agreement with the experimental values. In addition, for the vibrational excited states of the H16OF, H18OF, D18OF and D18OF, some unobserved vibrational energy levels and their isotopic effects have been predicted based on the new potential energy function of the hypofluorous acid(HOF). For molecules H18OF, D16OF, and D18OF,the vibrational frequency shifts relative to HOFspecies hold up appromately the combination rule:△v(H18OF)+△v(D16OF)≈△v(D18OF).In particular, for DOF molecule, it is shown that the stretching vibrational fundamental frequency blue shifts relative to HOFspecie is 2. 13 cm-1, which is close to the experimental values(- 2. 10 cm-1).For the stretching3.vibrational excited states of the molecule DOF, the excited vibrational frequency blue shifts have been predicted, for example, the blue shift is -4.2 cm-1,5. 6 cm-1ands.3 cm-1 for the vibrational states(002) , (003) and (004) of the DOF, respectively.
    Physico-Chemical Properties and Variation of Phase Regions of P204 Saponified by Alkaline Solutions
    ZENG Ping, WANG Gui-Qing
    1995, 16(12):  1945-1947. 
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    The physico-chemical properities, such as conductivity, viscosity and index of refraction of saponified P204 have been investigated.It can be seen that the conductivity, viscosity increase and index of refraction dereases with the change of the alkaline content in the saponification process.The single clear phase is observed for each saponification process before the equivalent point.These results can be explained assuming that a microemulsion of saponification process is formed. The effects of the long-chain alcohol on the saponification process have also been studied.
    Coordination Field Theoretical Calculation of EuP5O14
    FAN Ying-Fang, YANG Pin, PAN Da-Feng
    1995, 16(12):  1948-1950. 
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    By using the Double-Sphere Coordination Point-Charge Field (DSCPCF) model and the irreducible tensor operator method, thirty-five crystal field levels of the multiplets 7FJ (J=1～5) in EuP5O14are calculated and assigned according to the C2v site symmetry and to the subgroup chain relation of R(3)The calculated crystal field splitting energies are in quite good agreement with experimental data.The results of the DSCPCF model are remarkably superior to that of the simple static coordination point charge field (PCF)model etc.
    Two Novel Crosslinked Poled Polymers with Stable Second-Order Nonlinear Optical Properties
    HUANG Xu-Dong, GUO Jun-Shi, XIE Hong-Quan
    1995, 16(12):  1951-1955. 
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    Two kinds of crosslinked polymers, containing 4-( 4'-nitro-phenylazo) aniline chromophore groups were synthesized. Crosslinked polyacrylate was synthesized by polymerization of DR-19 diacrylate, whereas crosslinked polyurethane was obtained by the reaction between(β-hydroxyl propyl acrylate-DR-1 methacrylate)copolymer and phenol capped isocyanate terminated DR-19.The crosslinked polyacrylate and the crosslinked polyurethane exhibit glass transition temperatures at 125℃ and 160℃ respectively.Thin and transparent poled films of both crosslinked polymers were prepared by spin-coating, followed by thermal curing and corona poling at 160℃ for 1 h. The second-order nonlinear optical properties of the poled films were studied by visible light absorbance measurement according to one dimensional rigid oriented gas model.Along term stability of the dipole alignment at 140℃ for the crosslinked polyurethane was demonstrated.
    The Effect of Ultrasonication in Molecular Weight Parameters of Sodium Alginate Solution
    GAN Chun-Ji
    1995, 16(12):  1956-1959. 
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    In the ultrasonication the pHof the sodium alginate solution was stable,its temperature increased,and its apparent intrinsic viscosity decreased, and a change of three steps of decreasing, raising, and redecreasing occured in apparent average molecular weight of the sodium alginate. After the ultrasonication the apparent intrinsic viscosity and the apparent average molecular weight raised slightly we inferred that the conformation of the sodium alginate was changed under the condition.
    Novel Characteristics of Pauci-Chain Polystyrene Microsphere
    ZHAO Jun, MING Wei-Hua, LU Xu-Liang, WANG Chang-Chun, FU Shou-Kuang
    1995, 16(12):  1960-1963. 
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    Pauci-chain microspheres prepared by microemulsion polymerization contain only one or at most a few macromolecular chains whose special conformation is much different with that of ordinary polymer, which leads to some interesting physical properties. This paper reports apparent differences in thermal behavior between micro-PS (pauci-chainpolystyrene) and o-PS (ordinary polystyrene) during the DSC scan. Micro-PS displayed two exothermic peaks near 107℃ and 157℃ during the first scan. In the subsequent scan, both of them disappeared and only one glass transition similar to o-PS was shown.With the results from experiments of polarizing microscopy and X-ray diffraction, it can be concluded that both of the exothermic peaks were crystalline peaks.
    Studies on Styrene Bulk Polymerization by Dynamic Light Scattering
    HUANG Jin-Man, MA Rong-Jiu, YANG Mei-Lin, SHEN Jia-Cong
    1995, 16(12):  1964-1967. 
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    It is the first time to trace the whole process of styrene bulk polymerization continuously using the dynamic light scattering experiment.The scattering intensity, the diffusive coefficients and the molecular weight distribution of the polymer during the process of the polymerization were studied, and some information about the physics states of the polymerization system and the active polymer chains was obtained, such as the microinhomogeneity of the glassy state and the rigidity of active molecular chains and so on.
    Synthesis and the Porous Structure Studies of the Macroporous High Crosslinking styrene-divinyl-A Copolymers
    LIU Zhi-Qiang, LIU Feng-Qi, YANG Feng, WU Tong-Hao, YANG Hong-Mao, JIANG Yu-Zi, TANG Xin-Yi
    1995, 16(12):  1968-1971. 
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    Styrene-2,2-bismethacryloyloxyphenyl propane(divinyl-A) copolymers have been prepared by suspension copolymerization in the presence of toluene and using isoamyl alcohol as the diluents in the present paper.2,2-Bismethacryloyloxyphenyl propane (divinvl-A) as a novel crosslinking agent is first used in the synthesis of styrene type copolymer.Aseries of the macroporous and high crosslinking copolymers have been synthesized under different reaction conditions. The effects of the content of divinyl-A, type and content of these diluents,the amounts of initiator and PVA on the development of porosity of the copolymers are discussed. The characterization of the copolymers was carried out through the determination of apparenl density, specific area, pore volume and pore size.The appearance of the copolymer beads was examined by using scanning electron microscopy. It was found that the porosity of styrene-divinyl-Acopoymers increased with the increase of the amount of divinyl-A. And the specific area, pore volume and pore size increased with the inerease of amount of unsuitable solvent (isoamyl alcohol) content in diluent mixture.
    Studies on Non-Isothermal Crystallization Kinetics of iPS-b-iPP Block Copolymer
    XU Guang-Xue, LIN Shang-An
    1995, 16(12):  1972-1975. 
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    The non-isothermal crystallization kinetics of iPS-b-iPP block copolymers has been investigated by DSC.The results based on the Jeziorny's method show that in the range of cooling rate of 5 to 20℃/min, the kinetics of non-isothermal crystallization for all of samples is fitted for the Avrami equation quite well. The crystallization rate constant Zcrelates to the cooling rate, whereas the specific crystallizability Gcis dependent upon both the cooling rate and composition ratio of iPS-b-iPP copolymers.In addition, a discussion about the relationship between the growing mechanism of crystals and the composition ratio of iPS-b-iPP copolymers was made based on the Avrami exponents. Anew kinetics equation of non-isothermal crystallization derived by combining Avrami and Ozawa equation was proved to fit for kinetics of non-isothermal crystallization of iPS-b-iPPcopolymers.
    Assembly of CdS Nanoparticles in Polymer Networks
    HUANG Jin-Man, YANG Yi, YANG Bai, LIU Shi-Yong, SHEN Jia-Cong
    1995, 16(12):  1976-1977. 
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    CdSnanoparticles were assembled in polymer networks by ion exchange.TEMwas used to observe the particles, it indicated that the average size of the CdSnanoparticles was found to be 2.4 nm and it had a narrow size distribution. Data from the diffraction pattern of the CdS nanoparticles showed that the CdSnanoparticles in polymer networks were a hexagonal structure.
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