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Table of Content

    24 June 1986, Volume 7 Issue 6
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    Articles
    Luminescence of Eu2+-Ions in MFX (M=Ca,Sr or Ba;X-C1,Br or I)
    Su Mianzeng, Lin Kanhua
    1986, 7(6):  479-486. 
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    Six Eu2+-doped alkaline earth fluoride halides MFX (M = Ca, Sr or Ba; X = Cl, Br or I ) were synthesized by solid slate reactions. The composition and structure-dependence of the radiative transitions of Eu2+ in those hosts have been discussed according to their fluorescence emission and excitation spectra. The splitting energy levels of 4?65d excited state of Eu2+ in the crystal field of MFXmatrices (M = Ca, Sr or Ba) have been calculated.
    Studies on N-o-Hydroxybenzylglycine and Its Metal Complexes (Ⅳ)—The Equilibrium Constants of Copper(Ⅱ) Complexes and Properties of Cu(H2L) Solid Complex
    Zhang Hualin, Zhang Huinong, Zhou Meisheng
    1986, 7(6):  487-492. 
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    The solid complex of N-(o-hydroxybenzyl)-glycine (HBG) with copper ( Ⅱ )-Ctt(HL)2 was prepared under acidic conditions and characterized by solubility, molar conductance, magnetic moment, infrared spectra and thermogravimetric studies. The results indicate that two amino nitrogen atoms and two carboxylic oxygen atoms in HBGare coordinated in the complex. The formation constants of Cu( Ⅱ )-HBGcomplexes (KCuHLCu, KCuCu(HL)2,βCuCuL(HL) , βCuCu(HL)2 , KCuCuL , βCuCuL2), the proton dissociation constants of Cu(HL)2 (KHCuL(HL)x, KHCuL(HL)) and the hydrolysis constant of CuL(H2O)(KHCuL(H2O)) in aqueous solutions were determined pH-metrically at 30.0 ± 0.1 ℃ in the presence of 0.10M KNO3. The variant coordination forms of HBGin the complexes is discussed.
    A New BAT Ion Electrode and Microdetermination of Iodide Using I--BAT-H2O2 Reaction Monitored by the Electrode
    Wang Kemin, Yu Ruqin
    1986, 7(6):  493-498. 
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    Anew bromoamine-T (BAT) ion electrode made with a long-chain quaternary phosphonium salt hexadecyl triphenyl phosphonium (HTPP) as site material is described. The electrode shows remarkable improvement over the similar chloroamine-T (CAT) electrode reported in literature. Microamount of iodide in the range 0.4-64 ppb can be determined by using I- catalized BAT-H2O2 reaction monitored with BATion electrode. Most common ions do not interfere with the determination. The method is acceptable in the determination of protein-bound iodine. The possible reaction mechanism was proposed.
    Studies of the Effects of Surfactants on Me-5-Br-DEPAP and Me-5-Cl-PADAB Color Systems
    Qi Wenbin, Zhu Lizhong
    1986, 7(6):  499-502. 
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    The effect of surfactants on a series of Me-5-Br-DEPAPand Me-5-Cl-PADABcolor systems have been investigated in detail. The results indicated that the sensitizing effect of surfactants on the color systems and strengthening or weakening of the sensitizing effect are concerned with the valence of the metal ion, the type of its complex and structure of color reagents besides the characters of surfactants. The mechanism of the effect of surfactants on the color systems was discussed preliminarily.
    Catalytic Potentiometric Determination of Trace Amount of Copper (Ⅱ)
    Tong Huaxiang, Yang Shuxun
    1986, 7(6):  503-507. 
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    This paper describes the optimum conditions for determination of Cu ( Ⅱ) which catalyzes the reaction between peroxidisulphate and iodide that monitored by iodide selective electrode. Anew method of standard calibration and comparison was suggested simultaneously. At a fixed-time procedure, the variation of poten-tial(ΔmV) is linearly related to Cu ( Ⅱ ) Cone, in the range of 2.5 to 25 ng/ml.
    Synthesis and Antitumor Activity of 5-Fluorouracil Containing Amino Acid Derivatives
    Zhuo Renxi, Fan Changlie, Zhao Rulin
    1986, 7(6):  508-512. 
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    Twelve 5-fluorouracil amino acid derivatives were synthesized by the condensation of p-nitrophenyl 5-fluorouracil -1-ylacetate or p-nitrophenyl 5-fluorouracil -1-ylpropionate with a series of amino acids in alkaline DMF-H2 Osolvent. The structures of these new compounds were examined by IR, 1H NMRand UVspectra as well as elemental analysis. Animal screening data showed that some of the compounds exhibit certain antitumor activity .
    Analysis of Organometallic Compounds (Ⅵ)—Reversed-Phase High Performance Liquid Chromatography of Polar and Nonpolar Ferrocene Compounds
    Yang Xuejin, Sun Yuewen, Dong Xiangchao, Shi Shujian, Li Fengze, Cao Shiming, Chang Jianguo
    1986, 7(6):  513-518. 
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    In this paper, thirty-two ferrocene derivatives of different polarities have been separated by HPLCusing ODSas stationary phase, methanol-water ( with different ratios ) as mobile phase, and the relations between the retention values in the reversed-phase HPLCand their molecular structures have been described.
    Studies on Syntheses and Properties of Amphoteric Surfactants
    Du Xianxian, Sen Meina, Yang Shiguang, Chen Yukang, Wan Xianmei
    1986, 7(6):  513-518. 
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    The carboxylic amphoteric surfactants containing ether tertiary amino and carboxylic groups were prepared. Their structures areCH3(CH2)nCHCO2HOCH2CH2NEt2·HClwhere n = 7(a), 8(b), 9(c), 11(d), 13(e), 15(f), 16(g) and 19(h). These compounds were synthesized by the corresponding2-bromo fatty acid reacted with sodium 2-N, N-diethylaminoethoxide. The surface tensions and corrosion inhibition effect were determined for these surfactants. The surface tensions are 31.5, 32.1, 32.7, 35.4, 35.6, 37.0, 37.2, and 38.1 dyne/cm for a, b, c, d, e, f, g, and h respectively. The critical micelle concentrations are 25, 20, 7.5, 15, 1, 0.6, 0.5 and 0.1×10-5mol/l for respective compounds. They are good corrosion inhibitors for steel in acid solutions.
    Resolution of Diastereoisomeric 2-Octanol by Glass Capillary Gas Chromatography
    Yin Chenglie, Yu Jiayong, Wang Hanhui, Li Zongqi, Kang Zhiquan
    1986, 7(6):  519-521. 
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    Arapid and microanalytical method has been developed by using gas chromato-graphymass spectrometry for quantifying racemic-2-octanol, which can be easily converted to its diastereoisomer by treatment with a-acetyl-L-propionyl chloride in the presence of pyridine.The enantiomers of 2-octanol were separated as their a-acetyl-L-propionic ester derivatives on a capillary column coated with SE-30 or squalane as the stationary phase.
    A Study on Electronic Structure of the Complex of Praseodymium Nitrate with Benzo-12-Crown-4
    Li Zhenxiang, Ni Jiazan, Xu Guangxian, Ren Jingqing
    1986, 7(6):  519-521. 
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    In this investigation the electronic structure, the bond orders and the charge distributions of the complex of Pr(NO3)3 with Benzo- 12-crown-4 have been studied by INDOcalculation. The results have shown that 0.6e of negative charge transferred from the crown ligand to praseodymium during complexing, implying the considerable covalency of the bonds between the crown ring and the metal. The main contribution to bonding is due to the 5d orbitals of Pr while the 4f electrons are strongly localized. The frontier orbitals of the complex are endowed with π-character because of the existence of a benzo-ring in the crown ligand.
    Investigation on the Acidity and Catalytic Activity of H3PW12/sub> O40 and Its Salts
    Cai Tianxi, Sh Renmin, Chen Ping, Wang Daqing, Li Luhui
    1986, 7(6):  522-524. 
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    IRstudy showed that the Fe3+, Mg3+ and Na+ salts of H3PW12O40 have both Lewis acid and Bronsted acid sites. The relative acid strength of salts of H3PW12O40 determined by Benesi’s method is roughly as follows.(Al3+, Fe3+ , La3+, Cu3+ , Cd3+)>Zn2+>(Ca2+, Mg2+ )(Na2+, Li2+)The total acidity of H0≤+ 6.8 related approximately linearly with ionic potential and the electronegativity of the countercations. The acid quantity varied with the calcination temperatnre, showing maximum at 200-250℃.The somewhat different form of the graphs of catalytic activity versus acidity of catalysts on dehydration of isopropanol and isomerization of butene-1 might be due to that the former reaction occured in the bulk of the catalysts.
    Molecular Orbital Theory on Chain Conjugate Polymers(Ⅱ)—Linearity Rule for Homologous Series in Conjugate Systems
    Yang Zhongzhi, Ye Yuanjie, Tang Aoqing
    1986, 7(6):  535-542. 
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    Applying difference equation method,a decomposed expression of the eigene-quation for one type of the single-linked chain polymers is discussed,and the formulae for the molecular orbitals are given in closed form. The analytical energy expressions of polyenes which have alternatively long and short bond lengths are obtained by using the interpolation that is based on an approximate model proposed by us. In terms of this, the ionization energies of various homologous serieses of conjugate systems can be well correlated linearly by means of unified parameters for different energy levels.Asimilar treatment is also presented for double-linked systems.At last,a more rigorous criterion for deciding relative quality of correlation coefficients is proposed.
    The TDS Measurement of Reaction Order and Desorption Activation Energy for O2 and C2H5OH Adsorbed on Porapaks
    Jiang Weidong, Zhuang Chengqun, Wang Xun, Cai Xian'e
    1986, 7(6):  543-545. 
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    In this paper, the clcsorplion activation energies and reaction orders were studied for O2 and C2H5OHadsorbed on Porapaks by means of TDS. The results obtained were coincident with the heais of adsorption from. GCmeasurement according to the relation En- Ea=ΔH.
    A Study on the Thermodynamics of the Interaction of M(Ⅱ) Ions with L-Methionine
    Kan Chunmei, Ma Shulin, Guo Dewci, Chen Jingtang
    1986, 7(6):  546-548. 
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    The stepwisc formation constants, enthalpy and entropy changes for the formation of L-methionine-M( Ⅱ ) complexes have been determined. The probable structure of products was discussed in accordance with the analysis of the thermodynamic quantities.
    Study on Thermodynamics of the Anionic Equilibrium Polymerization of Alpha-Methylstyrene
    Guo Shaohua, Ying Shengkang
    1986, 7(6):  549-553. 
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    The thermodynamics of equilibrium polymerization of alpha-mclhylslyrene had been investigated. It was observed that the equilibrium monomer concentration[M]e is dependent not only on the temperature but also on the initiator concentration [BuLi]o.This phenomenon could be easily elucidated by the mechanism of polymerization proposed, and the mathematic relationship batween [M]e and [BuLi]o was obtained.Furthermore, the equilibrium constants of anionic equilibrium polymerization K1, K2, the free-energies ΔG1, ΔG2, heats of polymerization ΔH1, ΔH2,and entropies of polymerization ΔS1, ΔS2, of monomenc and associated reactive species were reported.
    Counter-Ion Effect in the Block Copolymerization of α-α-Dimethyl-β propiolactone and Polyester with Dicarboxy End Groups
    Jiang Shuojiau, Liu Huaibing, Zhao Hongrong, Li Youxiu, Feng Xinde
    1986, 7(6):  554-556. 
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    The effect of counter-ions on rates and block efficiencies of the block copo-lymerizations of α,α-dimethyl-β-propiolactone initiated by polyester with dicarboxy pentanoyl end groups were studied,
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