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中国化学前沿
高等教育出版社，Springer
中国化学前沿

高等教育出版社，Springer

季刊

1673-3495

100029

北京市朝阳区惠新东街4号富盛大厦15层

中国化学前沿/Journal Frontiers of Chemistry in China
查看更多>>涉及领域包括环境化学和绿色化学，生命科学中的化学和化学生物学，材料化学和纳米化学，化学中的信息技术和计算化学，物理化学和生物物理中的研究方法和技术，无机化学、有机化学以及分析化学中的新方法、新技术等。
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    Synthesis, crystal structure, and thermal properties of N,N'-di(diethoxythiophosphoryl)-1,4-phenylenediamine

    Yuanlin RENBowen CHENGJinshu ZHANGHongjun ZANG...
    304-308页
    查看更多>>摘要：The title compound N,N',di(diethoxythiophosphoryl),1,4,phenyl,enediamine was synthesized by the reaction of diethoxythiophosphoryl chloride with p,phe,nylenediamine and characterized by elemental analysis,IR, and 1H NMR spectra. Its crystal structure was determined by X,ray diffraction analysis and the thermal property was studied by TG analysis. The relative molecular weight of the title compound is 412.42. The crystal structure belongs to the orthorhombic, Pbca space group, with a=0.86936(16) nm, b=1.2787(2)nm,c=1.8897(3)nm,β=90°, V=2.1006(7) nm3, Z=8, Dc=1.304 g/cm3,μ(Mo Kα) = 0.425 mm,1, F(000)=872, S=1.052, the final R=0.0628 and wR=0.1860 for 1852 observed reflections with I＞2σ(I). The X,ray diffraction analysis demonstrates that the crystal structure is centrosymmetric.observed to link the molecules into sheets. The TG analysis shows that the title compound has good thermal stability and char forming capability and its fire retardation for polyacrylonitrile reveals that the compound is an excellent intumescent fire retardant.
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    Structure and properties of polymer modified TiO2 pillared montmorillonite

    Chenjing WANGJiang YUJianmin XINGHuizhou LIU...
    309-313页
    查看更多>>摘要：With the aim of improving the microstructures and properties of TiO2 pillared montmorillonite (MMT), a long,chain polymer (polyoxypropylenediamine, PPO,D 2000) was used as a template to synthesize composite pillared MMT. The materials were characterized by X,ray powder diffraction (XRD), Fourier transform infrared (FT,IR) spectrophotometer, Fourier Raman (FT,Raman)spectrophotometer, thermo,gravimeter/differential thermogravimeter (TG/DSC), transmission electron microscopy (TEM), and Brunauer,Emmett,Teller (BET) methods.The results show that as compared to low,molecular weight surfactant, this polymer significantly expanded the interlayer spacing and thus more TiO2 could be intercalated into MMT. The specific surface area of polymer/TiO2 pillared MMT was increased by 13% with comparison to TiO2 pillared MMT and rose to 241.52m2/g. Both the pore diameter and volume are doubled, and thus the pore structure is optimized markedly. The investigation on the photo,catalytic degradation of methyl orange in aqueous solution show that the modulation of polymer molecules raise the adsorption content of montmorillonite and improve the photo,catalytic activity. Therefore, this process provides a novel alternative to design and prepare the advanced eco,catalytic materials with high adsorption capacity and photo,catalytic activity.
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    Swelling and drug releasing properties of poly(N-isopropylacrylamide) thermo-sensitive copolymer gels

    Chunyue PANQingde LONGDian YUYanping RAO...
    314-319页
    查看更多>>摘要：A series of N,isopropylacrylamide (NIPAAm)copolymer gels with different hydrophilicities were prepared from NIPAAm, hydrophilic acrylamide (AAm) and hydrophobic butyl methacrylate (BMA). The swelling and thermo,responsive properties of PNIPAAm P (NIPAm,co,BMA) and P(NIPAm,co,AAm) copolymer hydrogels were investigated. The drug loading and releasing behaviors for two kinds of model drug with different hydrophilicities were studied. The result shows that the copolymer gels present negative thermo,sensitivities. The lower critical solution temperature (LCST), equilibrium swelling degree and the initial swelling rate increase as the hydrophilicity of gels increases when the temperature is below the LCST. With increasing gel hydrophilicity the loading ratio for sodium salicylate increases, while for salicylic acid, the reverse is observed. The initial drug releasing rate of sodium salicylate and salicylic acid also increase with increasing gel hydrophilicity. The initial drug releasing rate of sodium salicylate is significantly higher than that of salicylic acid. For salicylic acid which is less hydrophilic, the equilibrium releasing ratio at high temperature is lower than that at low temperature while for sodium salicylate which is more hydrophilic, the equilibrium releasing ratio at high temperature is almost the same as that at low temperature. Equilibrium releasing ratios of the three gels are significantly different from each other for salicylic acid when the temperature is below LCST while the equilibrium releasing ratios of the three gels are all 100% for sodium salicylate.
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    Synthesis of silica adsorbent and its selective separation for flavone

    Yuqing ZHANGYahui ZHANGZhen QINZhenrong MA...
    320-324页
    查看更多>>摘要：One kind of built,in silica adsorbent, which has high adsorption selectivity to rutin, was synthesized using molecular imprinting technology by the following steps:synthesis of precursor from the reaction between water soluble rutin (as template molecule) and the functional monomer chloropropyltriethoxysilane, co,hydrolysis of the precursor and tetraethoxysilane (TEOS), sol,gel aging process, and removal of template molecules. The results of adsorption experiment show that this adsorbent has a high adsorption capacity for rutin, and good adsorptionselectivity towards rutin even under the interference of a flavone with a similar structure. TEM photos suggest that nanocaves corresponding to rutin were formed inside the adsorbent while FTIR spectra indicate that new bond was generated during the recognition process.
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    Synthesis of CdTe colloidal quantum dots (QDs) in water

    Rong HEXiaogang YOUHongye TIANFeng GAO...
    325-329页
    查看更多>>摘要：The comparison of growth processes and fluorescent properties of CdTe semiconductor quantum dots (QDs) that are synthesized in water with different modifiers are discussed in this paper. The samples are characterized through ultraviolet,visible spectra (UV,Vis),photoluminescence spectra (PL) and zeta potential. The results show that when the reaction time is prolonged for the same modifier, the ultraviolet absorption peak and fluorescent emission peak present obvious red shifts and the diameters of the QDs continuously increase. With the same reaction time but different modifiers, QDs with different diameters can be gained. The average full width at half maximum of the photoluminescence spectra is about 50 nm which shows that the monodispersity is quite good.Under the best reaction conditions, the highest quantum yield (QY) can be attained by using thioglycollic acid (TGA) as modifier when the reaction time is 240 min.The zeta potential is influenced by the modifier and pH.
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    Synthesis and characterization of calixarene-based poly(ε-caprolactone) stars catalyzed by yttrium complex

    Pengfei GOUWeipu ZHUZhiquan SHEN
    330-337页
    查看更多>>摘要：Two calixarene derivatives (2a, 2b) have been synthesized and used as macro,initiators to prepare starshaped poly(ε,caprolactone)s (SPCLs) via controlled ringopening polymerization of ε,caprolactone in the presence of yttrium tris(2,6,di,tert,butyl,4,methylphenolate) [Y (DBMP)3]. The molecular weight of SPCLs was characterized by end group 1H,NMR analyses and size,exclusion chromatography (SEC). The results indicate that SPCLs based on a calix[4]arene derivative (2a) are well,defined four,arm star polymers with reasonably narrow molecular weight distributions in the given molecular weight range,while SPCLs based on a calix[6]arene derivative (2b) are star polymers with not so defined structures. Differential scanning calorimetry (DSC) analyses suggest that the maximal melting point, the crystallization temperature and the degree of crystallinity of SPCLs increases with the increasing molecular weight and are lower than those of the liner poly(ε,caprolactone) (LPCL) counterpart. Furthermore,polarized optical microscopy (POM) indicates that SPCL exhibits irregular spherulites with poor morphology and slower crystallization rate, whereas LPCL shows fast crystallization rate and good spherulitic morphology.
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    Synthesis of 1-aryl-2-propanones

    Li LIZhanpeng LIUYuanbin LIN
    338-343页
    查看更多>>摘要：A new convenient synthesis of a series of 1,aryl,2,propanones using aromatic amines as precursors,via diazo,reaction and improved Meerwein arylation reaction under mild conditions, was achieved. In addition,1,[3,5,bis(trifluoromethyl)phenyl],2,propanone is a new compound among the synthesized compounds. This approach is an efficient synthetic method for the arylpropanones with different substituting groups.
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    Analysis of composition complicated binary mixture by quantitative SEC

    Zhengnian CHENHongfeng XIEHu YANGZhiliu WANG...
    344-347页
    查看更多>>摘要：The analyses of the composition of a binary mixture composed of two kinds of industrial complicated materials have great importance for formulation in practice.The present paper provides a quantitative size exclusion chromatography (SEC) method based on the principle of absolute quantification of SEC to solve the problem. The conventional data treatment procedure for the differential refractive index (DRI) signal of SEC H(V) is improved first by dividing it with the injected sample weight and leads to a novel defined weight normalized distribution Hw(V) and its integral Iw(V). These two distributions reflect the response constant of the sample in addition to the conventional normalized distribution F(V). The difference of the average response constants of the composing components provides a sensitive method to compute the composition of their mixture from its Hw(V) or Iw(V). The method was applied to mixtures of a kind of industrial asphalt and paraffin diluents as an example, and successful results are obtained.
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    Calix[4]arene based selective fluorescent chemosensor for organic acid recognition

    Runhe WANGJianhua BUJunmin LIUShijun LIAO...
    348-352页
    查看更多>>摘要：A novel calix[4]arene,based fluorescent chemosensor bearing a 2,aminopyridine moiety and a naphthalenic fluorophore was synthesized The chemical structure of the product was elucidated by FT,IR, MS,FAB, NMR and elemental analyses. Then, the properties and identification mechanism of the synthesized chemosensor were investigated. The results show that the chemosensor exhibits selective fluorescent quenching in the presence of aromatic organic acid in acetonitrile solution, and that the binding ability of the chemosensor with organic acid is in the order of p,cyanic,benzyl acid＞p,chloric,benzyl acid＞p,methoxyl,benzyl acid＞benzyl acid.
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    Electrochemical behaviors of ofloxacin and its voltammetric determination at carbon nanotubes film modified electrode

    Chunhai YANGShenghui ZHANGYingxuan LIUWensheng HUANG...
    353-358页
    查看更多>>摘要：A multi,wall carbon nanotubes (MWNTs)Nation film,coated glassy carbon electrode (GCE) was fabricated and the electrochemical behavior of ofloxacin on the MWNTs,Nafion film,coated GCE were investigated by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS). The oxidation peak current of ofloxacin increased significantly on the MWNTs,Nation film modified GCE compared with that using a bare GCE. This nano,struc,tured film electrode exhibited excellent enhancement effects on the electrochemical oxidation of ofloxacin. A well,defined oxidation peak attributed to ofloxacin was observed at 0.97 V and was applied to the determination of ofloxacin. The oxidation peak current was proportional to ofloxacin concentration in the ranges 1.0×10,8 to 1.0×10,6 mol/L and 1.0×10,6 to 2.0×10,5 mol/L. A detection limit of 8.0×10,9 mol/L was obtained for 400 s accumulation at open circuit (S/N=3). This method for the detection of ofloxacin in human urine was satisfactory.
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