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    24 December 1996, Volume 17 Issue 12
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    Articles
    Studies on Tailed Metalloporphyrin Coordination Compounds(Ⅴ)──Synthesis,Characterization,Coordination and Catalytical Properties of 2-Benzothiazolethiol-Linked Iron(Ⅲ) Porphyrins
    HE Hong-Shan, HUANG Jin-Wang, JI Liang-Nian
    1996, 17(12):  1817-1823. 
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    Four new 2-benzothiazolethiollinked iron( Ⅲ) porphyrins were prepared and their structures were confirmed by elementary analysis,IR, FAB-MS,1H NMR and UV-visible spectra. The characterization confirms that the tail and the porphyrin ring is connected with the alkyl chain through a thiol ether linkage,ESRand MCDspectra indicate that the iron (Ⅲ) is in the high-spin state. Coordination constants of the imidazole adducts and catalytic activity to cyclohexane all show that the tail have larger effect on the iron center than the substituents in phenyl group.
    Hydrothermal Synthesis and Structures of SrTi1-xSnxO3
    ZHU Lian-Jie, XU Yue-Hua, FENG Shou-Hua
    1996, 17(12):  1824-1827. 
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    Sn-containing complex oxides,SrTi1-xSnxO3(O≤x<0.8)were synthesized under hydrothermal conditions. The products were identified by XRD, TGand IRtechniques. The results showed that the products could be synthesized at higher pH, and the compositions of the products were not the same of the mixture while there were some Sr and Sn left in the solution.The lattice volume increased with the increasing of the amount of Sn incorporated in the lattice of SrTiO3. The IRabsorption bands of the SrTi1-xSnxO3 were split,and moved towards blue with the increasing of the amount of Sn in SrTi1-xSnxO3 compounds.The products synthesized with Ti (OC4H9)4 contained little absorbed water and organic substance,which was lost at 350℃. The crystal sizes were small and even.
    synthesis,Luminescent Properties and Langmuir Films of Four New Amphiphilic N-Hexadecyl Pyridinium Tetrakis(3-phenyl-4-benzoyl-5-isoxazolone)Lanthanide Complexes
    ZNOU De-Jian, HUANG Chun-Hui, LUO Chu-Ping, YAO Guang-Qing, XU Jing-Mei, LI Tian-Kai, S. Umetani, M. Matsui
    1996, 17(12):  1828-1832. 
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    In this paper,four new amphiphilic N-hexadecyl pyridinium tetrakis(3-phenyl-4-benzoyl-5-isoxazolone) lanthanide complexes, Ln(PBI)4·HDP(Ln=Sm,Eu,Tb,Dy),were synthesized and characterized by elementary analysis,FT-IRspectra,TG-DTAanalysis and UV-Vis spectra, Their luminescent properties were studied and showed that they have good fluorescence performances, Their fluorescent lifetime was determined by using the frequency-domain method. Besides,the Langmuir films of the four complexes on the air/ water interface were also studied,the results show that all of them could form stable Langmuir films,This provides valuable data for the application of fluorescent lanthanide complexes in the microcavity laser oscillations.
    Molecular Recognition of Maltose by Tetrakis(sulfonic acid-benzene)Porphyrin
    GAO Shuang, WANG Xing-Qiao, YU Lian-Xiang, CAO Xi-Zhang
    1996, 17(12):  1833-1834. 
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    We studied that molecular recognition of Mono-and disaccharidies by watersoluble porphyrin using UV-vis titration method. The results shown that the tetrakis(sufonicacid-benzene) porphyrin has selective recognition to Maltose,The association constant between them was determined.
    Thermodynamic Properties of Vapor Rare Earth Complexes
    WANG Lin-Shan, WANG Zhi-Chang
    1996, 17(12):  1835-1836. 
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    This paper reports the formation thermodynamic properties of the vapor complex REAl3Cl12(RE= La—Lu except for Pm)investigated by quenching experiments in roughly the same temperature and pressure range( 604～851 Kand 0.02～0.20 MPa).The results of the investigation would be the first complete set of property values for vapor rare earth complexes.The relationship between ΔrH0298 and ΔrS0298 and the atomic numbers of the rare earth elements shows that the values of ΔrH0298 and ΔrS0298 decrease from La to Eu and then increase from Eu to Gd,and decrease from Gd to Er and then increase from Er to Lu, indicating a significant Gd break and two weak minimum points at Eu and Er. Here the Gd break is consistent with 1/2-filled 4f shell.
    Two-step-method Extraction of Endohedral Metallofullerenes
    HAO Chun-Yan, LIU Zi-Yang, XU Wen-Guo, GUO Xing-Hua, LIU Shu-Ying
    1996, 17(12):  1837-1839. 
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    Anew and efficient extraction method of endohedral metallofullerenes,especially of rare-earth elements encapsulated metallofullerenes, has been reported in this paper,Soxhlet-extraction of raw soot with toluene was used in the first step to wash away most accompanying C60,C70.Then pyridine was chosen as solvent to obtain high-temperature and highpressure extract.Two kinds of extract were analysed by DFIMSand LDI-MS, the results indicate that this two-step method can provide the extract,which has the highest fraction of endohedral metallofullerenes.So it will greatly simplify the following separation and purification processes of metallofullerenes.
    Studies on Thermal and Hydrothermal Stability for High-siliceous Molecular Sieve MCM-41
    DONG Wei-Yang, LONG Ying-Cai, GAO Xiao-Qin, XU Tai-Ming, XIE Guan-Gen, GAO Zi
    1996, 17(12):  1840-1842. 
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    High-siliceous MCM-41 was calcined at 800℃in dry air and at 600℃ in watersaturated air for different time respectively.Their XRDpatterns and adsorption isotherms of cyclohexane were determined.The results show that the structure of MCM-41 is more stable after calcining at high temperature in dry air. The structures of the samples were damaged by the hydrothermal treatment precalcined at high temperature in dry air for different time with different degrees.The parent MCM-41 was damaged more,but the precalcined samples less.The influence of thermal and hydrothermal treatment on the pore size is not too remarkable.
    Studies on Relaxation Kinetics of Coordination Reaction Between Ti and 3,5-Dibromosalicylfluorone
    ZHU Bi-Xue, LIN Zhi-Xin, CAI Ru-Xiu
    1996, 17(12):  1843-1846. 
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    In this paper,the relaxation time was determined at different Ti(Ⅳ)concentrations by the concentration jump relaxation method. The reasonable mechanism is drawn up.The expression of 1/was derived from the assumed mechanism of reaction. The apparentrate constant and molar absorbance index were obtained by the concentration jump relaxation Tnethod.The results shows that the value of stability constant of the complex (K=1.799×109) is in agreement with that (K=2.12 × 109)obtained by using equilibrium movement method.
    Electrocatalysis of Hemoglobin at Azure I Chemically Modified Electrodes
    HE Chun-Xiang, YUAi-Min, HAN Ji-Lin, CHEN Hong-Yuan
    1996, 17(12):  1847-1850. 
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    The CME modified by azure I,a new electron-transfer mediator,which was electrodeposited onto the surface of spectrographic graphite electrode ,shows significantly electrocatalytic activity to the reduction of hemoglobin,In the potential range from 0.3 V to-0.7V(vs. SCE),the mediator azure Ibehaves as one-electron reversible redox process involving two protons in acid solution and one proton in basic solution.In the medium of 0.2 mo1/L HAc-NaAc(pH=5.5).The formal potential E0'of the electrodeposited azure I is -0.21 Vand the apparent electron-transfer rate constant is 0.69 s-1.This CME shows a good stability.
    Investigation on the Affection of Harmonic Potentials in AC Oscillographic Chronopotentiometry
    QI Hong, TIAN Min, ZHENG Jian-Bin, YU Ke-Qi, GAO Hong
    1996, 17(12):  1851-1854. 
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    Anew method for the investigation of harmonic potentials in ACoscillographic chronopotentiometry is suggested.The computer sampling and fast Fourier transform(FFT)are used.The potential-time curve and its frequency response for Cd2+ are investigated at a gold microelectrode.The sensitivity of the method for Cd2+ is improved, and a good linear relationship between peak height and concentration of Cd2+ is obtained(correlation coefficient is 0.9945).Some approaches for eliminating charging current and high frequency noises are discussed.
    Studies on the Binding of Nalidixic Acid to Serunm Albumins Using Site Markers Ibuprofen and Phenylbutazone
    XU Yan, SHEN Han-xi, HUANG Han-Guo
    1996, 17(12):  1855-1858. 
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    Through the binding with nalidixic acid,bovine serum albumin(BSA)and human serum albumin (HSA) could quench the characteristic fluorescence of nalidixic acid-terbium chelate. Because of the tight binding of phenylbutazone and ibuprofen to the special sites of albumins, they were used as the binding site markers on the albumins, In this paper the different effects of BSAand HSAon the fluorescence of nalidixic acid-terbium chelate were discussed. According to the displacement of the site markers on albumins, the binding site of nalidixic acid on the BSAhas been found to be the Ⅱ special binding site.
    Chemiluminescence Determination of D-amino Acid Based on Immobilized Enzymes
    FENG Man-Liang, HUANG Yu-Wen, GONG Zhi-Long, ZHANG Zhu-Jun
    1996, 17(12):  1859-1861. 
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    D-amino acid oxidase and HRPwere separately immobilized on chitosan adsorbed on the silica gels to develop a chemiluminescent method,which was combined with two oxidation reactions of D-amino acid producing H2O2 catalyzed by D-amino acid oxidase and of Luminol-H2O2 generating CLcatalyzed by HRPtogether,also was stopped──flow technique used in this system. It has a good selectivity and sensitivity. Under optimized conditions,the detection limit is 1.8 ×10-5g/mL,the liner range of D-amino acid concentration was from 8× 10-8 to 1. 4×10-6g/mL,It was practicable to determine D-amino acid in serum directly with satisfactory results.
    Laser-Induced Fluorcence-Intensified Charge Coupled-Device(LIF-ICCD) Used for Detection of Capillary Electrophoresis
    MA Ming-Sheng, WU Xiao-Jun, LIU Guo-Quan
    1996, 17(12):  1862-1864. 
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    Laser-induced fluorescence-intensified charge coupled-device(LIF-ICCD)was applied as detection of capillary electrophoresis.Various effects were studied both for the data collection of frequency and sensitivity of fluorescence detection in order to arrive at the optimun conditions.Acapillary electrophoregram of 4.5 ×10-12 mol/Lof fluorescein isothiocyanate(FITC)was obtained with the LIF-ICCD detector under the chosen conditions.
    Synthesis and Herbicidal Activity of 1-(p-Toluene sulfonyl)-2-phenoxy-3-aryl-1,4,2-diazaphos pholidin-5-thione-2-oxides
    CHEN Ru-Yu, HE Liang-Nian, YANG Xiu-Feng
    1996, 17(12):  1865-1868. 
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    Phenyl-3-(p-toluenesulfonyl) thiourea was reacted with triphenylphosphite and substituted benzaldehydes to give 1-(p-toluenesulfonyl)-2-oxo-2-phenoxy-3-aryl-1,4,2-di-azaphospholidin-5-thiones in anhydrous toluene. The by-reactions of the preparation process were discussed. The structures of new compounds were confirmed by elementary analysis,1H NMR, 31P NMR, MSand IRspectra. The results of preliminary bioassay show that they possess a herbicidal activity at 1.5kg/ha in post-emergent tests against six kinds of plants including Barnyard-grass, Oat, Rape, and Alfalfa,etc.
    Strdies on Biological Active Organophosphorus Compounds(XII)──Synthesis and Property of α-(2-Benzoxazolyl)oxyacetoxyalkyl Phosphonates
    HU Li-Ming, HE Hong-Wu, LIU Zhao-Jie
    1996, 17(12):  1869-1873. 
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    Twenty-one new phosphorus compounds were synthesized by the reaction of O,O-dialkyl-α-chloroacetoxyalkyl phosphonates and sodium salt of 3-hydroxymethylbenzoxazolone.Their structures were confirmed by means of elementary analysis,IR,1H and 31P NMR and MS.The possible mechanism is that the unsteady reactive intermediate reacting from reactants undergoes intramolecular electron migration rearrangement to form the products.
    Using Molecular Graphics,Molecular Mechanics,Quantum Chemistry and Electrostatic Potential Methods to Study Structure-Property Relationship on Pesticides(Ⅷ)──Studies on the Affection of Surface Area and Conformation Difference of Sulfonylurea Molecule
    WANG Xia, SUN Ying, YUAN Man-Xue, LAI Cheng-Ming, LI Zheng-Ming
    1996, 17(12):  1874-1877. 
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    In order to study the factors further which affect the SARof sulfonylurea molecules,we inspect mainly the characteristic structure factors of the whole molecule such as surface area and conformation difference.The research objects are 23 newly synthesized sulfonylurea molecules whose PI50 values are from 7.5751 to 3.0752.We apply multiply regression in this paper.The result shows that the AREA value,which reflects the surface area,and the d1,d2 and d values,which reflect the conformation difference,influence remarkably the activity of this series of sulfonylurea molecules.
    Studies on Linear Heterotrimetallic M-E-M(M=Mo,W;E=Hg,Zn) Compounds──Synthesis,Properties and Structural Characterization of [η5-RC5H4(CO)3M]2Zn(M=Mo,W;R=CO2Me,CO2Et)
    SONG Li-Cheng, DONG Yu-Bin, TAO Zhi-Fu, HU Qing-Mei
    1996, 17(12):  1878-1881. 
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    The trimetallic M-Hg-Mcompounds containing an electron-withdrawing group Ron cyclopentadienyl ring[η5-RC5H4(CO)3M]2Hg (M=Mo,W;R=CO2Me,CO2Et) have been shown to react with activated Zn powder in THFat reflux to give the corresponding trimetallic M-Zn-Mcompounds [η5-RC5H4(CO)3M]2Zn (M=Mo,W;R=Co2Me,CO2Et),while the M-Hg-Mcompounds carrying an electron-releasing substituent Ron cyclopentadienyl ring [η5-RC5H4(CO)3M]2Hg(M=Me, Et) failed to react with Zn powder under the similar conditions to afford the corresponding M-Zn-Mcompounds[η5-RC5H4(CO)3M]2Zn (M=Mo,W;R=Me,Et). These trimetallic compounds [η5-RC5H4(CO) 3M]2Zn (M=Mo,W;R=CO2Me,CO2Et)obtained are white and air-sensitive solids,soluble in high polar solvents such as THF,DMSOand.acetone,which have been fully char acterized by elementary analysis,IR,1H NMRand MStechniques. Interestingly,the com pound [η5-RC5H4(CO)3M]2Zn(M=Mo,CO2Et) was shown to react with CDCl3 during1H NMRdetermination to give the corresponding organometallic halide [η5-EtO2CC5H4·(CO)3MoCl.
    Studies on Organic-Silicon compounds with Biological Activity(XIV)──Studies on Butacoordinated Dithio(thio) phosphate Compounds Containing Silicon
    LIAO Ren-An, CHEN Xiao
    1996, 17(12):  1882-1885. 
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    Thirteen butacoordinated dithiophosphate and two butacoordinated thiophosphate compounds containing silicon were synthesized.Their structures were established by elementary analysis,IR,1H NMR,MS.Bioassay results of some of the target compounds show that they have a good biological activity.
    Progress on the Water-soluble Constituents and Its Pharmacology of Panax Potoginseng
    LI Qi, YE Yun-Hua, XING Qi-Yi
    1996, 17(12):  1886-1892. 
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    Panax Notoginseng,Chinese traditional medicine,has drawn more attention in recent years. In this paper the water-soluble constituents of P. notoginseng and its pharmacological activities,especially neurophysiological activity,are reviewed and compared with other Panax species. The practicability of peptide-extraction of P. notoginseng is also discussed.
    Studies on Structure-Activity Relationship of Epibatidine and Its Analogues
    XU Jian-Ping, HE Dong, WANG Zhi-Zhong, SHEN Jia-Cong, GAO Lian-Xun, SONG Ya-Ru
    1996, 17(12):  1893-1895. 
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    This paper reported the investigation of structure-activity relationship of the strong analgetic alkaloid epibatidine and it's analogues by using AMImethod. Some information was given according to the calculation results of HOMO electron density and electron charge distribution etc.It is also indicated that the biophores were the bridge nitrogen and exo-pyridine moiety of these alkaloids.
    Synthesis and Physical Properties of Adducts of Transition-metal Complex Cations Containing Amine Ligands with [Ni(cdc)2]2-
    LI Jin-Shan, XIE Bin
    1996, 17(12):  1896-1898. 
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    Aseries of adducts of transition-metal complex cations containing amine ligands with [Ni(cdc)2]2-,[ML2][Ni(cdc)2] (cdc=N-cyanodithiocarbimate; M=Cu(Ⅱ), Ni(Ⅱ),Zn(Ⅱ),Mn(Ⅱ);L=en,pn,tn,dien,opda) and [Ni(en)3][Ni(cdc)2],have been synthesized by metathetical reaction between transition-metal complexes containing amine ligands and K2[Ni(cdc)2].The physical properties of these adducts were investigated.The interaction between cations and anion was discussed.
    Effect of Electron Pushing and Drawing Substituents on Properties and Electronic Structures of Derivatives
    CHAI Xiang-Dong, JIANG Yue-Shun, YANG Wen-Sheng, ZHANG Dong, CAO Yun-Wei, ZHU Zhen-Jia, LI Tie-Jin
    1996, 17(12):  1899-1903. 
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    Three ferrocene derivatives were synthesized and their results of cyclic voltammetry,electronic absorption spectra and spectroelectrochemistry were analyzed in terms of frontier molecular orbital interactions. Their molecular orbital energy levels were given on the basis of the analysis. Experimental results show that PⅡ has two reversible redox couples,the corresponding values of and are 0.33 and 0.59V,respectively.In the first oxidation state,PⅡ+(D-Fc+-R) shows a strong LMCT (ligand-to-metal-charge-transfer)band at 613 nm.This suggests that it may serve as a redox switching of optical properties.PⅢ shows strong LMCTand π→π CTbands at 356 and 320 nm, respectively, which should result in high second order nonlinear optical response.
    Ab Initio study of H+HF2→NF(a)+HF Reaction
    GUO Jing-Zhong, DENG Cong-Hao
    1996, 17(12):  1904-1908. 
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    The reaction of H+NF2→NF(a)+HF was studied by using ab initio methods.The geometries and frequencies for all species were calculated at MP2(FULL)/6-31G(d)level of theory.The energies of all species were further calculated using Gaussian 2 theory.The result implies that the reaction proceeds via an addition-elimination mechanism on the lowest singlet potential surface.The addition processes form HNF2 molecules as the intermediates without barriers,The metastable radical NF(a)is formed by unimolecular HFelimination reactions via three-centered transition state.The best estimation of the heat of reaction is -119.4kJ/mol at 298 K. The energy of the transition state forming NF(a) is 98.4 kJ/mol lower than the reactants,The intermediate HNF2 with an energy of 313.5kJ/mol lower than the reactants is the lowest point on the potential surface,Since the overall activation energy is negative,the title reaction is expected to be a good chemical source of NF(a)radical which was found experimentally.
    Optimal Structure and Vebrational Spectra of (H2O)n+(n+1,2)
    LI Xue-Kui, WANG Chang-Sheng, SUN Jia-Zhong
    1996, 17(12):  1909-1913. 
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    ab initio geometry optimizations were performed on the (H2O)(n=1,2) system.Subsequent geometry optimizing calculations and analysis of frequencies had shown that the water dimer cation in the equilibrium structure could be regarded as a complex between an oxonium ion H3O+ and a hydroxyl radical OH.The present geometry optimizations were performed by a gradient method included in the Gaussian-92 program. The optimized geometry of (H2O)+ at the MP2/6-311+G (d,p)level is in excellent agreement with the experiment results obtained by Dinelli.
    Studies on Preparation of LaHZSM-5 by Microwave Technique and Its Cracking Properties
    CHANG Chun, ZHANG Wu-Yang, ZHANG Li-Hua, LI Rong-Sheng, TIAN Ming-Wen, YANG Xu-Wei, HOU Li
    1996, 17(12):  1914-1917. 
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    Aseries of LaHZSM-5 samples with different La3+ exchange degrees were prePared by microwave technique. The effects of microwave power,exchang time and Si/Al ratio on La3+)exchange degree have been investigated.found that Bronsted and Lewis acid sites are present on the surfaces of samples. The strength and amount of the strong and weak acid sites are changed with different amount of La3+ added into ZSM-5 zeolites,The studies on catalytic properties show that the cracking activity is correlation to the amount of La3+ in samples.
    A Studyof Structure,Electrical Property and Iron Oxidation State of Sr1-xBixFeO3-y Compounds of Perovskite Type
    NI Xing, WU Yong, BAO Jian-Chun, YANG Min-Fu
    1996, 17(12):  1918-1921. 
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    Aseries of non-stoichiometric compounds, Sr1-xBixFeO3-y of perovskite type were synthesized at 1100 ℃ and the chemical formula and the average valence state of iron ions were determined by chemical analysis.The structure and property of the compounds were characterized by X-ray powder diffraction, alternating current ohmage,IRand Mossbauer spectroscopy.The compounds have a Pm3m symmetry and show a semiconductor property.The iron ion in the compounds underwent disproportion reaction.The synthesis was obviously performed at lower temperature,shorter reaction time and lower energy consumption conditions compared to previous literature reports
    High-Temperature Flash Pyrolysis of Di-tert-butyl Peroxidee in a Jet-cooled Expansion
    LIU Zhao-Xiang, LU Jian-Jiang, HAN Zhen-Hui, DAI Zi-Guo, QIN Qi-Zong
    1996, 17(12):  1922-1926. 
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    The mass distribution and time-of-flight(TOF)spectra for the pyrolytic fragments of di-tert-butyl peroxide (DTBP) seeded in He or Ar carrier gas have been achieved by using time-resolved mass spectrometric and high ternperature flash pyrolysis techniques,The dependence of DTBPconversion yield on the heated SiCtube temperature(Ts) shows that the precursor molecule in the carrier gas starts to decompose obviously at 900 K,and reaches complete decomposition at 1300 K. Two major fragments CH3COCH3 and CH3·radical are observed.In a pulsed free jet expansion of 4% mole fraction of DTBP/Ar gas mixture,the TOFspectra of pyrolytic fragments measured at Ts=1000 K show that there are two peaks for CH3COCHion(m/e=58)and its fragment ions,CH3CO+ and CH (m/e=43 and 15).When He or N2 is used as a carrier gas,however,only one peak is observed in its TOFspectra. This result implies that a fraction of jet-cooled CH3COCH3+(m/e=58) molecules combine with Ar and form the van der Waals molecules CH3COCH3.Arn. Formation of CH3COCH3·Arn is also suggested via the TOFexperiments in which acetone is used as a precursor seeded in Ar carrier gas. The proposed mechanism of DTBP flash pyrolysis mainly involves the initial split of the O-Obond of DTBP to generate(CH3)3CO·radical,followed by the decomposition of this radical into CH3COCH3 and CH3·radical,and the recombination or secondary bi-molecular reactions of product radicals are suppressed in the flash pyrolysis of DTBP with a very shot contact time.
    Effect of Microenvironment of Substtates on the Catalysis of Horseradish Peroxidase in Aqueous Micelle System
    ZHOU Yong-Liang, FU Xue-Qi, MA Lin, WANG Jin-Dui
    1996, 17(12):  1927-1929. 
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    The kinetic constants of different aromatic amines substrates catalyzed by HRPin the organic solvent and aqueous micelle system were compared by the method of fluorescence,It was found that the catalytic reactions by HRPin the aqueous micelle system took place on a strict hydrophilic/hydrophobic interface;Meanwhile,the enzymatic properties on the interface were preliminarily studied and the effect of the substrates with different extending solvent sites in the micelle on the reaction kinetic constants was discussed.
    Studies on Phenol Hydroxylation with Hydroxylation with Hydrogen Peroxide over Spinel-type Cadmium Ferrite
    YU Jian-Feng, YANG Yu, WU Tong-Hao, SUN Chia-Chung
    1996, 17(12):  1930-1931. 
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    Cadmium ferrite with spinel structure was synthesized and characteried by means of XRD and Mossbauer.The reaction conditions of phenol hydroxylation with hydrogen peroxide were researched over the catalyst using water as the solvent and good results were obtained.
    Direct Electron Transfer Reaction of Horse Heart Hemoglobin at the Indium Oxide Electrode
    YANG Xiu-Juan, CHOU Ju, LU Tian-Hong
    1996, 17(12):  1932-1933. 
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    A direct,quasi-reversible electrochemical reaction of horse heart hemoglobin without further purification was obtained for the first time at the indium oxide electrode when oxygen was removed from the solution and hemoglobin molecules.It was found that removing oxygen from the solution and hemoglobin molecules is an important factor for obtaining the quasi-reversible electrochemical reaction of hemoglobin.
    A Proposed Method of Calculating Binding Population of Acetate Group on M-CyDTA Complexes by 1H NMR Relative Chemical Shift
    SONG Rui-Fang, LI Fei, LIU Guang-Min, MAO You-Gang
    1996, 17(12):  1934-1936. 
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    The relative chemical shifts of the binding state and rotation state of acetate groups were individually determined.The method for calculating the binding population of acetate group was proposed.The standard free energy △G0 of the binding-dissociating process was estimated.
    Estimation of the Standard Formation Enthalpy of Carbonates
    DAI Zhang-wen, WANG Zhen-Min, XU Yan, DAI Xiao-Hong
    1996, 17(12):  1937-1939. 
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    An influence of bond structure factors containing ionic charge,coordination radius and electron configuration etc,on the thermodynamic property of carbonates is investigated by means of the bond parameter function CASPscale. A new method for predicting the standard formation enthalpy ΔH0f of the carbonates is established,and the values of some carbonates are calculated,the results are in good agreement with the relative values from literatures.There are some H0f values of the carbonates such as MgCO3,Tb2(CO3)3 etc.in literatures,which seem to be unusual and are also discussed in this paper.
    Synthesis and Investigation of Intermolecular Hydrogen Bonded Complexes Between 6-(4-Octyloxyphenyl-azophenoxy)-1-hexyl Polymaleicated and 4-(4-Heptanoxybenzoyloxy)-4'-stilbazole
    XU Xiao-He, TAIN Yan-Qing, CHEN Hao, WANG Yan-Yan, ZHAO Ying-Ying, TANG Xin-Yi, LI Tie-Jin, WANG Wei-Wei
    1996, 17(12):  1940-1943. 
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    In this paper,a new polymer 6-(4-octyloxyphenyl-azophenoxy)-hexyl polymaleicated (PMAN-OAB) was prepared;And intermolecular hydrogen bonded complexes between PMAN-OAB which acts as a proton donor and 4-( 4-heptanoxybenzoyloxy) -4'-stil-bazole(7SZ) which acts as a proton acceptor were studied. The results show that PMANOABis bilayer arrangement through intermolecular hydrogen bonding between carboxylic groups in its liquid crystalline state,its tilte angle at 118℃ is 39.3°,The results also show that the temperature ranges of the complexes containing 7SZfrom 40% to 90%are broader than those of PMAN-OAB and 7SZ.
    The Initial Oxidations of MMA and MAA by Molecular Oxygen
    DING Yu-Ping, QIU Kun-Yuan, FENG Xin-De
    1996, 17(12):  1944-1947. 
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    Methyl methacrylate (MMA) and methylacrylic acid(MAA) can form the contact charge transfer complex(CCT) with O2,respectively.After O2 was bubbled,the concentration of hydroperoxide in MMAincreased with the increasing of oxidation time,however,it did not increase in MAA. From the IR,NMRspectra,it showed that the initial oxidation occured on the α-methyl group of MMAand MAAmolecules via MMA-O2 CCTand MAAO2 CCT,respectively. In the case of MAA,the hydroperoxide group would further decompose and produce an aldehyde group.
    A New Method of Syntheses of Aromatic Polyester Dendrimer
    BO Zhi-Shan, WANG Zhi-Qiang, BIAN Feng-Lan, ZHANG Xi, YANG Mei-Lin, SHEN Jia-Cong
    1996, 17(12):  1948-1951. 
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    Dihydroxybenzoic acid,the starting material, is esterified with methanol to protect the carboxylic group,then react with benzoyl chloride to obtain methyl 3, 5-bisbenzoyloxybenzoate,3,5-Bisbenzoyloxybenzoic acid is obtained with high yield by removing the protecting group with AlCl3/NaI. Then this acid reacts with methyl 3, 5-dihydroxybenzoate to obtain the second generation dendron with methyl ester at the anchor point.The second genration acid is obtained by deprotecting with AlCl3/NaI.Aryl poly-ester dendrimer is obtained by the reaction of the acid with 4, 4' -biphenol.Their structures are established with IR and NMR spectra.
    Polymeric Electroluminescence Materials
    LI Jian-Ke, QI Zong-Neng, WANG Fo-Song
    1996, 17(12):  1952-1958. 
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    In this review,basic principles and construction of polymer electroluminescent device are described.The development of the electroluminscent polymers is reviewed. Much emphasis is given to tuning of the emission color and efficiency.
    Synergism of BR-DCP on PS/LLDPE/SBS Blends
    FANG Zheng-Ping, XU Cheng-Wei, XIANG Yi-Chong
    1996, 17(12):  1959-1961. 
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    This paper investigated the influences of BRand DCP on PS/LLDPE/SBSb lend.Addition of BRwas found to decrease the impact strength of PS/LLDPE/SBSb lend. When DCPwas added together,it is found that the co-crosslinking of BRand PEtook place,which resulted in the improvement of the blend's ductility.At the same time,the decomposition of Pskinhibit666ue to the presence of BR. The roles of BRand DCPin PS/LLDPE/SBSblends were also studied by using SEM,DSCand selective extraction techniques.
    Polymeric Surfactants of High performance
    FAN Zhong-Yong, LI Na, WU Da-Cheng, Zhaohui Su, S. L. Hsu
    1996, 17(12):  1962-1964. 
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    Polymeric surfactants are the kind of polymers with the average molecular weight 103~105 as well as the kind of surface active substances which can decrease obviously the surface tension on the air-water surface. It was found that end-capped polyethylene oxides(PEO) were very active polymeric surfactants, where one or two terminal groups of PEOwere replaced with perfluoroalkyl group (perfluorodecanoyl). Their number-averaged molecular weights were in the range of 3000～16000 When concentration of aqueous solutions for these perfluoroalkyl end-capped PEOwas in the range of 0.4%～1% (percentage by weight),the surface tension of their aqueous solutions decreases as low as 15 mN·m-1 which is the best value of the surface activity for polymeric surfactants up to now. The molecular picture for the adsorption of perfluoroalkyl end-capped PEOwas presented briefly.
    Synthesis and Properties of Poly(aryl ether ether ketone ketone)Containing meta-Phenyl Links
    LIN Quan, WANG Yi-Fan, ZHANG Wan-Jin, WU Zhong-Wen, YIN Jiu-Mei
    1996, 17(12):  1965-1967. 
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    A Series of poly(aryl ether ether ketone ketone)containing meta-phenyl link were synthesized,the general properties were studied by DSC,stretch,impact,etc.The results indicated that with the raising of meta linkage monomer fractions,the glass transition point decreased,the melting temperature decreased at first,and then disappeared, but for all meta-linked polymer,Tm appeared once more.And this kind of polymer had good stretch and impact resistance performance.
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