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Table of Content

    23 September 2007, Volume 25 Issue 5
    Two-Photon Excited Fluorescent Imaging for Cu2+ in Living Cells
    GAO Yan-hong, YU Meng-xiao, LI Fu-you, LI Ding-guo, YI Tao, LU Han-ming, HUANG Chun-hui
    2007, 25(5):  321-326.  DOI: 10.7517/j.issn.1674-0475.2007.05.321
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    Based on the spirolactam (nonfluorescent) to ring-open amide (fluorescent) equilibrium, a dye FD2 was demonstrated as a highly selective sensor for Cu2+ over other metal ions. This probe is the first Cu2+ chemosensor with turn-on (85-fold) two-photon excited fluorescence.Moreover, two-photon fluorescent microscopy experiments further establish that FD2 can be used for sensing Cu2+ within living cells.
    Thermal Stable Retro-Crosslinking Polymers Based on "Diels-Alder" Reaction which Containing a New AZO Chromophore
    WANG Zhi-peng, BO Shu-hui, ZHAO Wen-ke, LIU Jia-lei, WANG Jian-she, QIU Lin, ZHEN Zhen, LIU Xin-hou
    2007, 25(5):  327-332.  DOI: 10.7517/j.issn.1674-0475.2007.05.327
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    Polymers NLO1-P1 and NLO1-P2 containing the new azo chromophore were designed and prepared, which possess crosslinking ability through retro-"Diels-Alder" and "Diels-Alder" reaction. Because the crosslinking groups of furan-capped maleimide and furan-3-carboxylic acid were designed covalently attaching to the two kinds of polymers NLO1-P1 and NLO1-P2, respectively, the chromophore content in the polymers were greatly increased (32.1% in NLO1-P1 and 44.4% in NLO1-P2).These polymer systems were crosslinking in low temperature (below 70 ℃) and non-crosslinking in high temperature (about 150 ℃). The crosslinking characteristic could resolve the problem "nonlinearity-stability tradeoff" which consists in the traditional crosslinking electro-optic polymer.The thermal stability and thermal reversible character of the network polymer were confirmed through thermal gravimetric analysis (TGA) and differential scanning calorimeter (DSC).
    The Interaction Between 4-Dicyanovinyl-N,N-dimethylaniline with Surfactants
    WANG Jin-ling, GUO Xiang-feng, JIA Li-hua
    2007, 25(5):  333-339.  DOI: 10.7517/j.issn.1674-0475.2007.05.333
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    Since 4-dicyanovinyl-N,N-dimethylaniline (DCVA) is a prototype class of organic donor-acceptor compound, which is sensitive to microenvironmental properties such as polarity, viscosity and hydrogen bonding capacity. Interactions of DCVA with sodium dodecylsulphate (SDS), dodecyltrimethylammonium bromide (DTAB) ,and polyoxythylene (23) laurylether (BRIJ35) have been investigated by measuring the fluorescent spectra of DCVA in aqueous solutions of varying concentrations surfactants. The fluorescent intensities of DCVA are enhanced approximately 5.1-fold, 5.4-fold,and 3.3-fold by DTAB, BRIJ 35 ,and SDS micelles compared with that in aqueous solution, as well as the emission maximum wavelengths of DCVA blue-shift 5, 11,and 9 nm, respectively. In addition, according to the emission maximum wavelengths of DCVA in micelles, the microenvironment polarities of binding sites of DCVA in DTAB and BRIJ 35 micelles are similar, but that of DCVA in SDS micelle is obviously higher. The binding constants are calculated by the fluorescence intensities of DCVA in the three kinds of micelles to be 1.7×103,1.4×103,and 8.8×102,respectively.
    Preparation and Photocatalytic Performance of Li+-Doped Nano-TiO2
    ZHU Qi-an, WANG Shu-feng, CHEN Wan-ping, SUN Xu-feng, ZHANG Qi
    2007, 25(5):  340-349.  DOI: 10.7517/j.issn.1674-0475.2007.05.340
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    Li+-doped nano-TiO2 photocatalysts were prepared by sol-gel route and by impregnation method, respectively. The catalysts were characterized by TEM and XRD techniques, and pH of zero charge (pHpzc) of catalysts were measured by pH drift method. The results show that all catalysts prepared at 500℃ are anatase phase. Li+-doping restrains the growth of TiO2 particles, improves the dispersivity of the catalyst. The pHpzc of catalysts is in the range 6.6—8.1, depending on the doping method and concentration of doped Li+. UV light and sunlight were used as light sources to investigate the photocatalytic activity of the catalysts for the degradation of malachite green and methyl orange, and the contents of CO2 produced by the degradation of pollutants were determined by gas chromatography(GC). It has been found that , for the degradation malachite green, Li+-doping both by sol-gel route and by impregnation method can all enhance the catalytic activity of TiO2, effectively, but the catalysts prepared by the impregnation method are more efficient than those prepared by sol-gel route,and the best photoactivity is obtained for 5%(mole fraction) Li+-doped TiO2 prepared by impregnation technology and its photocatalytic efficiency is 6—8 times under UV light and 9—10 times under sunlight higher than that of pure TiO2; for methyl orange degradation, Li+-doping reduces the catalytic activity of TiO2 to some extent, except for 3%(mole fraction)Li+-doped TiO2 which is slightly better prepared by sol-gel route. The contents of the final degradation products CO2 increase with improving of the photocatalytic activity of the catalysts. The main reasons of reverse photocatalytic activity of Li+-doped TiO2 in degrading different organic pollutants is that Li+-doping changes pHpzc and the state of the charge of TiO2 surface.
    Novel Organic Salts as Two-Photon Polymerization Photoinitiator: Synthesis and Properties
    WANG Yu-lan, CHEN Wei-qiang, DONG Xian-zi, DU Zhen-xia, DUAN Xuan-ming
    2007, 25(5):  350-356.  DOI: 10.7517/j.issn.1674-0475.2007.05.350
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    2-[2-(9-Pentyl-carbazol-3-yl)-vinyl]-1,3,3-trimethyl indolium iodide (I) was synthesized and its photophysical properties were investigated. The properties of two-photon induced polymerization for acrylate resin with compound I as the initiator were studied on laser power, scanning speed and initiator concentration. The results showed that the threshold laser energy for resin was 139 kJ/cm2 when 0.88% of I was used as initiator and the threshold exposure time was 0.7 ms when the laser energy was 286 kJ/cm2.
    The Synthesis and Hydrolysis Evaluation of 2-Alkyl Adamantine-2-yl Methacrylate
    HUI Chuang, MENG Qing-wei, GONG Bin, QU Jing-ping
    2007, 25(5):  357-363.  DOI: 10.7517/j.issn.1674-0475.2007.05.357
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    2-methyl adamantine-2-yl methacrylate and 2-ethyl adamantine-2-yl methacrylate are two important monomers of matrix polymer for 193 nm photoresist. The two compounds are synthesized based on utilizing methylmagnesium iodide(ethylmagnesium iodide) as Grinard reagent reacted with 2-adamantone to provide 2-methyl(ethyl) adamantine-2-yl which then esterified with methacryloyl chloride in the presence of NaH to provide the target compounds with the yields of 50—60%. The structures of the compounds are confirmed by 1HNMR, IR, MS and Elementary Analysis. The hydrolysis test was carried out using TsOH·H2O as catalyst and the hydrolysis mechanism was discussed. The calculated hydrolysis rate constants k are -1.52 and -3.90, respectively.
    Ultrafast Kinetics Characteristics of Fluorescence in Anionic-Cationic Cyanine Dyes
    YANG Shao-peng, LI Chun-lei, FAN Shan-shan, LI Xiao-wei, FU Guang-sheng
    2007, 25(5):  364-373.  DOI: 10.7517/j.issn.1674-0475.2007.05.364
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    In this paper, the fluorescence decay property of J-aggregates of anionic-cationic cyanine dye, anion dye and cation dye adsorbed on cubic and tabular AgBrI grains is investigated using femtosecond fluorescence up-conversion technology. The kinetics of the ultrafast electron transfer and the spectral sensitization property in the dye sensitized system are analyzed in details. By comparing the fluorescence decay property of the sensitization system of several dyes, it is found the electron transfer velocities of J-aggregates of anionic-cationic dyes is larger than that of anion dye, cation dye and the mixed of anion dye and cation dye. The sensitized efficiency of anionic-cationic dyes for the tabular grains is higher than that for the cubic ones. Dye2 has higher sensitized efficiency than Dye1 for both kinds of AgBrI grains.
    Preparation and Optical Properties of Flourescein Doped Sol-gel SiO2/MSO Coating
    ZHAO Xin, JIANG Xiao-dong, ZENG Jue-fa, ZHOU Zai-de, JIANG BO
    2007, 25(5):  374-379.  DOI: 10.7517/j.issn.1674-0475.2007.05.374
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    The dye fluorescein doped silica/methyl silicon oil (MOS) coating was prepared by the sol-gel method. The fluorescein doped SiO2/MSO coating was investigated with SPM, UV-Vis and fluorescence analysis for its optical properties. The results showed that the fluorescein doped SiO2 coating which was excitated by 350~450 nm wavelength give an emission spectrum with maximum wavelength at 520 nm. The fluorescence intensity of SiO2/MSO coating was 50% stronger than the common SiO2 coating. Accelerated aging test at the temperature of 70℃ showed that fluorescence quenching taking place considerably beyond 20 days, a reduction of more than 70% was observed for the fluorescence intensity of SiO2 coating, on the other hand, the reduction of fluorescence intensity of SiO2/MSO coating was only 15% after 20 days.
    Using Supramolecular Interaction to Improve the Water Solubility of Hypocrellin B:Synthesis of Adamantane-Modified HB and the Photodynamic Activity Study of Its Polymeric β-CD Inclusion System
    QIAO Rui, ZENG Zhang-hua, LIU Yan-yan, CHEN Jing-rong, LI Cao, WANG Xue-song, ZHANG Bao-wen
    2007, 25(5):  380-386.  DOI: 10.7517/j.issn.1674-0475.2007.05.380
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    An adamantane-modified hypocrellin B was designed and synthesized, and was dissolved in aqueous solutions by way of the supramolecular inclusion interaction between the adamantane group and β-cyclodextrin polymer. ESR technique was applied to study the photodynamic activities of the aqueous solution of the adamantane-modified hypocrellin B and β-cyclodextrin polymer.
    The Progress of Image Reversal Components Composing Napthoquinone Diazide Compounds
    YU Shang-xian, YANG Jin-rui, GU Jiang-nan
    2007, 25(5):  387-395.  DOI: 10.7517/j.issn.1674-0475.2007.05.387
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    The article presented the progress of image reversal components composing napthoquinone diazide compounds. The title image reversal components can be classified into three categories. The mechanism of first category is mainly based on decarboxylation,esterification and/or imide reaction;and that of the second is because of crosslinking reaction of binder resin and crosslinker or deblocking reaction in the presence of an acid which was produced by napthoquinone diazide compounds.The third category can be image reversed by near-UV and high energy exposure.The first and third image reversal components can be applied to photoresist and the second can be applied to printing plate possibly.