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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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    Banana fiber-reinforced biodegradable soy protein composites

    Rakesh KumarVeena ChoudharySaroj MishraIk Varma...
    243-250页
    查看更多>>摘要：Banana fiber,a waste product of banana cultivation,has been used to prepare banana fiber reinforced soy protein composites. Alkali modified banana fibers were characterized in terms of density,denier and crystallinity index. Fourier transformed infrared spectroscopy (FTIR),scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) were also performed on the fibers. Soy protein composites were prepared by incorporating different volume fractions of alkali,treated and untreated fibers into soy protein isolate (SPI) with different amounts of glycerol (25%,50%) as plasticizer.Composites thus prepared were characterized in terms of mechanical properties,SEM and water resistance.The results indicate that at 0.3 volume fraction,tensile strength and modulus of alkali treated fiber reinforced soy protein composites increased to 82% and 963%,respectively,compared to soy protein film without fibers.Water resistance of the composites increased significantly with the addition of glutaraldehyde which acts as crosslinking agent. Biodegradability of the composites has also been tested in the contaminated environment and the composites were found to be 100% biodegradable.
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    Synthesis of 1,2-bis[2-methyl-5(3,4-difluorophenyl)-3-thienyl] perfluorocyclopentene

    Taiqi LIULiyan YANGJianxiang YU
    251-253页
    查看更多>>摘要：2,Methylthiophene (1) was treated at 0℃ with liquid bromine to form 3,5,dibromo,2,methylthiophene (2) which reacted with tributyl borate to give 2,methyl,3,bromo,5,boronate thiophene (3) at,78℃. Treatment of 3 with 3,4,difluorobrombenzene gave 2,methyl,3,bromo,5,(3,4,difluorophenyl)thiophene (4). Finally,a novel photochromic dithienylethene compound,1,2,bis [2,methyl,5(3,4,difluorophenyl),3,thienyl]perfluorocyclopentene (DT,1),was synthesized by the reaction of 4 with perfluorocyclopentene at,78℃. The compound (DT,1)was characterized by IR,NMR,MS,elemental analysis and its photochromic behavior was also discussed.
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    Thermodynamic analysis of fluorescence enhancement and Quenching theory equations

    Manman YANGXiaoli XIPin YANG
    254-261页
    查看更多>>摘要：The action of the three kinds of new third generation cephalosporin,class drugs,cefepime hydrochroride,cefpiramide and ceftizoxime with HSA and BSA was studied at different temperatures through the fluorescence method. First,the binding constants were calculated by using fluorescence quenching and enhancement theoretical equations. Their thermodynamic functions were also calculated. Because the KA corresponding to the different theoretical equations are not completely the same,the thermodynamic parameters calculated are also different. In this paper,the differences among these thermodynamic data obtained from the different theoretical equations were analyzed and the results show that the thermodynamic data deduced from fluorescence enhancement are more reasonable. Thus,we propose that even when the fluorescence quenching action of the acceptorsubstrate is studied,more realistic data can be obtained by using the fluorescence enhancement equation.
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    Effect of fatty acid methyl esters from plastrum testudinis on proliferation of rat bone mesenchymal stem cells

    Yuehua ZHANGHeping ZENGDongfeng CHEN
    262-266页
    查看更多>>摘要：The ointment of plastrum testudinis was extracted using petroleum ether,ether and dichloromethane sequentially and the extracts were methyl,esteri,fled. The effects on the proliferation of bone marrow mesenchymal stem cells (bMMSCs) were examined by MTT[3,(4,5,dimethylthiazol,2,yl),2,5,diphenyl tetrazolium bromide] assay and flow cytometry analysis. The volatile components of the samples were studied by gas chromatography,mass spectrometry (GC,MS) and high performance liquid chromatography (HPLC). The results show that the methyl,esterified parts can promote the proliferation of stem cells and they all contain palmitic acid methyl ester. Palmitic acid methyl ester can promote proliferation when the concentration was 0.15 μg/μL. It may be concluded that the palmitic acid methyl ester is important for the methyl,esterified parts that have effects on proliferation.
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    Synthesis-characterization and photosensitivity of tetrakis-α-(2-methyl-8-quinolinoxy) metallophthalocyanines

    Jinping XUEHong LIUChangan FANHuming HONG...
    267-274页
    查看更多>>摘要：Four amphipathic cobalt(Ⅱ),nickel(Ⅱ),copper (Ⅱ),and zinc(Ⅱ) coordination compounds of tetrakis,α,(2,methyl,8,quinolinoxy)phthalocyanine are synthesized using "DBU catalytic method". The titled complexes are characterized by elemental analysis,mass spectra,UV,Vis,and IR spectra. In addition,the rates of photogenerated singlet oxygen and the rate constants of photodynamic oxidation of amino,acid substrate by the complexes are measured under the optical excitation at 670 nm,and the relations between their structures and their photosensitivities are discussed.
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    Synthesis of MnV2O6 nanoflakes via simple hydrothermal process

    Yi LIUYitai QIAN
    275-278页
    查看更多>>摘要：A single phase of monoclinic MnV2O6 nanoflakes was prepared by a hydrothermal process at 180℃ starting materials and using acetic acid to adjust the pH value of the reaction solution. The as,prepared samples were characterized by field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). X,ray photoelectron spectrum (XPS) measurements further confirm the component of MnV2O6.Results indicated that the products consisted of a large quantity of compact accumulated nanoflakes,with average width of 0.85 μtm,thickness of 100 nm and lengths up to 1.7μm.
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    Organic reactions catalyzed by 1-4-diazabicyclo [2.2.2] octane(DABCO)

    Hua YANGRui TIANYe LI
    279-287页
    查看更多>>摘要：The organic reactions catalyzed by 1,4,diaza,bicyclo [2.2.2] octane (DABCO) are reviewed. Most of the reactions start conveniently from available substrate and proceed under mild conditions. The reactions are environmentally friendly and the catalyst can be recycled in some cases. The perspectives on DABCO,catalyzed reactions are pointed out.
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    Kinetics of adsorption of di-n-butyl phthalate (DBP) by four different granule-activated carbons

    Po keung TSANGZhanqiang FANGHui LIUXiaolei CHEN...
    288-293页
    查看更多>>摘要：The kinetics of the adsorption of an endocrine disruptor,di,n,butyl phthalate (DBP),by four different granulated,activated carbons (GACs) is presented in this paper. Results showed that adsorption of DBP by the four GACs followed first,order kinetics and the adsorption constant of the four GAC was found to follow the order:nut shell＞coconut shell＞Coaly carbon 1.0＞Coaly carbon 1.5. Batch adsorption studies were also conducted to investigate the effect of pH on the adsorption process. The optimum pH for the removal of DBP from aqueous solutions under the experimental conditions used in this work was found to be 5.0. The characterization of the carbon surfaces was conducted by using scanning electron microscopy (SEM). Furthermore,results from infrared spectroscopic (IR) studies showed that physical adsorption plays an important role in the adsorption of DBP by the four selected GACs.
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    Synthesis,crystal structure and magnetic properties of bimetallic complex of Ni2Co(TTHA).12H2O

    Chun YANGGongleng XUBin LIUQinglun WANG...
    294-297页
    查看更多>>摘要：The bimetallic complex of Ni2Co(TTHA).12H2O (TTHA=triethylene tetraminehexaacetic acid)was synthesized and characterized structurally and magnetically. The title complex crystallizes in the triclinic c=1.5041(4) nm;α=73.38(2),β=83.97(2),7=70.50(2)°.The crystal structure is built up of [Niz(TTHA)(H2O)2]2,,Co(H2O)6 2+and water molecules. The variable magnetic measurement shows that there is strong antiferromagnetic interaction between two Ni(Ⅱ) ions in [Ni2(TTHA)(H2O)2]2,with JNi,Ni=,141.64 cm,1,gNi=2.21 and that the constant of spin,orbit coupling of Co(Ⅱ) ion is ,134.8 cm,1.
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    Synthesis and characterization of three-arm star-shaped polyethylene glycols with 1,1,1-trihydroxmethylpropane as cores

    Kangcheng WANGWei HUANGYongfeng ZHOUDeyue YAN...
    298-303页
    查看更多>>摘要：A small molecule core (TMP,SK3) with three terminal carboxyl groups was synthesized successfully by the reaction of 1,1,1,trihydroxymethylpropane with the excessive sebacic acid diacetic anhydride (SK). Then, the core molecule was used as a coupling agent to condensate with polyethylene glycols (PEG) of different molecular weights or polyethylene glycol monomethyl ether (PEGm) in the presence of stannous octoate as catalyst and diphenyl ether as an azeotropic agent to remove water. Thus, the three,arm star,shaped PEGs was obtained successfully and characterized by IH,NMR,DSC, GPC and XRD etc. DSC measurements indicate that the crystallizing and the melting temperatures of the three,arm star,shaped PEGs were different from those of the corresponding linear PEG because the existence of TMP,SK3 altered its crystallizing velocity and perfect degree of crystallization.
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