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    24 January 1989, Volume 5 Issue 1
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    Articles
    The Synthesis of Single Crystals of Manganese Aluminophosphate Molecular Sieve and Studies on Their Properties
    Han Shuyun, Zhou Jianrong
    1989, 5(1):  1-7. 
    Abstract ( )   PDF (458KB) ( )  
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    Single crystals of the molecular sieve, MnAPO-5, were synthesized by hydrothermal synthesis in the presence of fluoride ions. It was shown by X-ray diffraction, infrared spectroscopy, electron paramagnetic resonance spectroscopy, electron probe analysis and chemical composition analysis that the structure of MnAPO-5 is of the A1PO-5 type, and manganese(Ⅱ) is incorporated into the framework. Adsorption properties, thermal stability and surface acidity were also investigated.
    Synthesis and Characterization of Ti-ZSM-5 in a Non-alkaline Medium in the Presence of Fluoride Ions
    Qiu Shilun, Pang Wenqin, Xu Ruren
    1989, 5(1):  8-17. 
    Abstract ( )   PDF (920KB) ( )  
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    Ti-ZSM-5 was synthesized by hydro thermal crystallization in the presence of fluoride via using a non-alkaline medium. pH values were 57. SEM showed perfect Ti-ZSM-5 crystals and a large single crystal growing from the favourable medium. Substitution of titanium for silicon in the ZSM-5 framework led to a decrease of crystal size and of the length/width ratio. Electron microprobe analysis indicated a homogeneous distribution of titanium in the ZSM-5 framework. The unit cell parameters of the Ti-ZSM-5 determined by XRD increased with an increase in titanium content in the framework. TiO4tetrahedron vibrations were found in the IR spectrum. Si（1Ti） peakwas seen in the 29Si MAS NMR spectrum at -1O1ppm（from TMS） and 13CMAS NMR analysis verified the effect of （C3H7）4N+F- occluded in thechannels. XPS study on the precursors, calcined and H2O2 adsorbed Ti-ZSM-5 was performed and some interesting results were observed.
    Theoretical Study on the Mass Transfer of Metal Ions in Ion Exchange Process
    Jia Dongfang, Qiu Ling, Zhou Yabing
    1989, 5(1):  18-25. 
    Abstract ( )   PDF (465KB) ( )  
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    The kinetics of ion exchange between Ca2+, Mg2+, Co(Ⅱ), Cu(Ⅱ),Ni(Ⅱ), Fe(Ⅲ), y3+ or Sm3+, respectively, in 0.50 mol/L HCl and H+ on macrorecticular sulfonic ion exchange resin and the kinetics of the same reactions (M -H exchange) when Mn(Ⅱ) coexisted in resin phase as accelerating ion were studied. The accelerating effect manifested and its rule are consistent with the accelerating effect theory based on the concept concerned with adsorption electrical double layer which has been suggested in a previous paper published.
    Study on the Atomization Process of Lithium in Electrothermal Atomic Absorption Spectrometry
    Yan Xiuping, Lin Tiezheng
    1989, 5(1):  26-33. 
    Abstract ( )   PDF (446KB) ( )  
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    A new method for determining the kinetic order and activation energy for atom formation in electrothermal atomic absorption spec-trometry is proposed. The assumption of first order kinetics for atom formation and the steady-state approximation which appeared in the previous models is avoided in the proposed method. The kinetic parameters for atom formation of Li have been obtained, and the effect of the amount of analysed sample, ashing temperature, atomization temperature, heating rate, gas flow and tube surface on the atomization of Li has also been investigated.
    The Adsorption and Photocatalytic Decomposition of Citric Acid on Pt/TiO2
    Cai Naicai, Jian Cuiying, Dong Qinghua
    1989, 5(1):  34-40. 
    Abstract ( )   PDF (409KB) ( )  
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    The adsorption and photocatalutic decomposition of citric acid on both Pt/TiO2 powder and n-TiO2 single crystal electrode were studied in aqueous solutions of various pH. It was found that citrate ions were chemisorbed on TiO2, which could increase the interfacial capacity and the filling factor of photocurrent-potential curves. The quantity of adsorption, slope of mott-Shottky plot and the rate of photocatalytic decomposition of citric acid were found to depend strongly on pH of solution. The phot ocatalytic decomposition of citric acid was discussed in light of its adsorption on TiO2.
    Studies on the Aromatic Dihalocarbonyl Ylides and Their Deoxygenation
    Huan Zhenwei, Pan Yinming, Qu Xiaosu, Gao Zhenheng
    1989, 5(1):  41-49. 
    Abstract ( )   PDF (498KB) ( )  
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    The deoxygenation reaction of heptanones, cycloheptanone, cycloheptatrienone or substituted cycloheptatrienone with dihalo-carbene results in carbon monoxide and corresponding halides. The yield of CO produced by 2, 4, 6-triphenylcycloheptatrienone is 2.6-3.5 times as high as that produced by the saturated heptanones. The structures, energies, charge distributions, bond orders, and other relative parameters of the dihalocarbonyl glides were calculated by using the SCF-MNDO method. The obtained data reveal that the ylides from cycloheptatrienone have aromatic structure and are different from those produced from saturated cycloheptanone. The reactivities of the dihalocarbonyl ylides are discussed. It is proposed that this aromatic structure should be responsible for the high yield of CO from the reaction of cycloheptatrienone with dihalocarbene.
    Synthesis and Structure of trans-1,2-Bisaromatic Heterocycle Substituted Cyclopropanes
    Wang Changsheng, Pan Jiaxing, Gao Zhenheng, Yao Xinkan, Wang Ruji, Wang Honggen
    1989, 5(1):  50-60. 
    Abstract ( )   PDF (593KB) ( )  
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    Trans-1,2-bis(2'-(5'-phenyl-1', 3', 4'-oxadiazolyl ) ) cyclopropane (BDCP) and its eleven substituted novel derivatives were synthesized. Besides four derivatives of l,2-bis(2'-(5'-phenyl-l', 3', 4'-ox-adiazo1yl))ethane (BPDS) were also synthesized as model compounds. The crystal structure of ethyl BDCP was determined and the cyclopropane ring was found to be able to transmit conjugation between the aromatic groups directly bonding with it by studying the ultraviolet and fluorescent spectra of the above compounds.
    Syntheses of Benzoxepinoquinolinone and Benzothiepinoquinolinone
    Yang Dingqiao, Jiang Guiji, Gao Yongjun
    1989, 5(1):  61-67. 
    Abstract ( )   PDF (395KB) ( )  
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    l-Benzoxepino(3, 4-b)quinolin-l3(6H)-one and its halogen,alkyl, alkoxy derivatives Va'-d'and 1-benzothiepino(3,4-b}-quinolin- 13 ( 6H)-one Vf, and its alkyl derivatives Vg, weresynthesized through cyclization of 2-(substituted phenoxymethyl)-3-quinolinecarboxylic acids Va-d and 2-[ (un)substituted phen-ylthiomethyll-3-quinolinecarboxylic acids IVf-g in the presence ofpolyphosphoric acid.The acids IV were obtained from the corresponding ethyl-esters @ whcih were prepared through refluxing ethyl 2-bromo-methyl-3-quinolinecarboxylate(1) with substituted phenol or (un)substituted thiophenol in the presence of NaOEt.The compound Vg, was allowed to react with NBS, KaBH4, NH2OH-HCl to give compounds VII, VIII, and IX, respectively.The structures of 24 new compounds have been confirmed by elemental analysis, IR and 1H NMR.
    Quantum Chemistry Study of Microstructure of Molecular Sieve of APO-5 Type
    Guo Chunxiao, Hou Jun, Xu Ruren
    1989, 5(1):  68-74. 
    Abstract ( )   PDF (396KB) ( )  
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    Four-membered and six-membered rings were chosen as substructure units to simulate molecular sieve of APO-5 type. The stability of various orderings of AlO4 and PO4 tetrahedra in micros tracture of the APO-5 type was studied by using CNDO/2 method.By means of analysing energies of systems, frontier orbitals, charges and bond orders in detail, Loewenstein's empirical rule is explained theoretically.
    Kinetics of Reaction Bisphenol-S Epoxy Resin with Methylacrylic Acid
    Gao Jungang, Wang Fengli, Jin Ruimin, Zhu Guiju
    1989, 5(1):  75-81. 
    Abstract ( )   PDF (361KB) ( )  
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    The reaction kinetics of bisphenol-S epoxy resin with methyl-acrylic acid in the presence of quaternary ammonium salt catalyst was studied. The reaction rate constants at different temperatures were determined. The reaction is first order with respect to epoxy group, zero order with respect to methylacrylic acid and 0.71 order with respect to quaternary ammonium salt catalyst, respectively. The mechanism of this reaction was discussed.
    Application of IPF Theory to the Study of lonization Equilibrium
    Wang Pengyun
    1989, 5(1):  82-88. 
    Abstract ( )   PDF (403KB) ( )  
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    This article is a theoretical study about ionization equilibrium. Taking the ionization equilibrium of acetic acid in a series of MeOH-water mixtures as an example, we calculated the ionization constant Ka according to the IPF theory, the Born theory and the vander Waals theory, respectively. The results indicate that the values obtained by the IPF theory are in best accordance with those from literatures. A brief discussion about the theories is given at the end.
    Studies on Kinetics of Chlorination Reaction of Polyethylene
    Zhang Zhijun, Sun Gang, Zhang Ping, Cao Guifang, Zhao Ling
    1989, 5(1):  89-96. 
    Abstract ( )   PDF (434KB) ( )  
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    Through kinetic method, the reaction mechanism and the rate equations of chlorination of polyethylene are suggested in this paper. The rate of chlorination is second order with respect to the concentration of methylene remained and chlorine, respectively. Apparent changes in crystallinity during chlorination processes were determinated by differential scanning calorimetry(DSC). The mathematical model relating crystallinety with kinetic parameters and function of sequence length distribution are derived.
    Studies on the Syntheses and Properties of UV-sensitive Organosilicon Monomers and Polymers
    Zhuo Renxi, Lou Xia
    1989, 5(1):  97-103. 
    Abstract ( )   PDF (389KB) ( )  
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    Photosensitive organosilicon monomers and polymers containing furylacrylate, cinnamate or methacrylate groups were synthesized. The chemical structure of these organosilicon monomers were confirmed by 1H NMR and elemental analysis.The curing rates of these photosensitive polysiloxanes were also determined, all of them show a good UV-sensitivity. The UV-sensitivity of polysiloxanes containing pendent furylacrylates are comparable to that of polysiloxanes with either pendent cinnamate or pendent methacrylate groups.
    Syntheses and Structure-Odor Relationship of Some γ-Lactones
    Wang Xiaolan, Tang Shixiong, Jiang Lasheng
    1989, 5(1):  104-107. 
    Abstract ( )   PDF (211KB) ( )  
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    Studies on Biomlmetic Oxidation for the Model Compound of Cytochrome P-450(IV)——Studies on Oxygenation of Cyclohexane Catalyzed by μ-Oxo-bis(5,10, 15,20-tetraphenylporphinato)iron(Ⅲ)
    Zhu Shenjie, Gui Mingde, Guo Cancheng
    1989, 5(1):  108-111. 
    Abstract ( )   PDF (310KB) ( )  
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Editor-in-Chief:
Jihong YU
ISSN 1005-9040
CN 22-1183/O6
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