Table of Content

23 July 2008, Volume 26 Issue 4

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Synthesis,Characterization and Chemiluminescence of 10-Methylacridinium Esters

MU Xiao-jing, LIU Min, YAN Shu-shan

2008, 26(4):  257-264.  DOI: 10.7517/j.issn.1674-0475.2008.04.257

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The acridine esters are known chemiluminescent molecules with good quantum yield.As a chemiluminescnet regent,they are essentially composed of two parts:acridine ring and leaving group.Modifications on the leaving group have been made to yield four new derivatives with different substituents.And their molecular structures were characterized with ¹HNMR,¹³CNMR,IR and MS.All of them showed reasonable chemiluminescent kinetics and good quantum yields.The hydrolytic stability of the target compounds were tested by chemiluminescent method.

Study on the Synthesis and Thermal Behavior of AgSt/AgBr Composite

CAO Jing, LIN Hai-li, LIU Chun-ping, WANG Jun-en, SHAO Xin

2008, 26(4):  265-270.  DOI: 10.7517/j.issn.1674-0475.2008.04.265

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AgSt/AgBr composite was synthesized by in situ method,which NaBr and silver stearate(AgSt) was respectively used as bromide source and substrate.The structure,size,morphology and crystal form of AgSt/AgBr composite was respectively measured by FTIR,SEM,XRD,as well as the thermal behavior investigated by TG-DSC.The results showed:(1) that AgSt/AgBr composite was composed of substrate AgSt and epitaxial cubic AgBr particles with sizes ranging from 30 to 50 nm;(2) that two new phase transition peaks appeared at 97.8 ℃ and 108.8 ℃ respectively for AgSt/AgBr composite;(3) the start decomposition temperature of AgSt/AgBr composite decreased a little than that of AgSt.

Glucose Biosensor Based on the Gold Nanorod/Chitosan Composite Film as Immobilization Matrix

DU Ai-ming, REN Xiang-ling, TANG Fang-qiong, ZHANG Lin, LIU Feng-ling

2008, 26(4):  271-279.  DOI: 10.7517/j.issn.1674-0475.2008.04.271

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Au nanorod /chitosan have good biocompatibility,and are suitable for enzyme immobilization.In this paper,Au nanorod /chitosan composite matrix was developed to fabricate the glucose biosensor.The fabrication of electrode is simple and easily operated.The enzyme electrode was characterized by electrochemistry impedance spectrum and cyclic voltammetry,and the equivalent circuit was given.The experimental results indicated that the Au nanorod/chitosan composite membrane could increase the electronic transfer and response current of electrode.The linear range was 2.78×10^-5 to 2.22×10^-3 mol/L with a detection limit of 5.0×10-6 mol/L at 3 σ and a sensitivity of 7.819 μA·cm^-2(mmol/L)^-1,the apparent Michaelis-Menten constant(K_m) is 10.387 mmol/L.The current response maintained 80% of original response after the electrode was repeatedly used 50 times.Further,it was found that 35 ℃ and 6.8 of pH are the set of optimal for the electrode measurement.

Synthesis and Photopolymerization Kinetics of Benzophenone Derivative with High Molecular Weight

WANG Ying, XIAO Pu, DAI Ming-zhi, WU Gang-qiang, SHI Su-qing, NIE Jun

2008, 26(4):  280-284.  DOI: 10.7517/j.issn.1674-0475.2008.04.280

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A benzophenone derivative photoinitiator with high molecular weight,HBP-TDI-DHBP-TDI-HBP(HTDTH),based on 4-hydroxy benzophenone(HBP),toluene-2,4-diisocyanate(TDI) and 4,4’-dihydroxy benzophenone(DHBP),was synthesized and characterized by FTIR.The photopolymerization kinetics showed that HTDTH was an effective photoinitiator.When HTDTH and amine were used to initiate polymerization of acrylates,both rate of polymerization(R_p) and final conversion(P) increased with increase of amine and HTDTH concentration.

Fabrication of the Optical Waveguide Ethanol Gas Sensor

MAMUT Mariya, MAHMUT Mamtimin, MAHMUT Malikizat, ABLIZ Abdusalam, YIMIT Abliz

2008, 26(4):  285-290.  DOI: 10.7517/j.issn.1674-0475.2008.04.285

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An optical Waveguide(OWG) gas sensor was fabricated by coating a thin film of Poly(Vinylidene Fluoride)(PVDF) onto the surface of K⁺-ion exchanged glass OWG.The results show that the present sensor has rapid,reversible,high sensitivity and selectivity to ethanol gas and is also characterized by low cost,simple structure,and facile fabrication.

Research on Synthesis and Properties of Novel 3H-indolenine Fluorescent Cyanine Dyes

CHEN Xiu-ying, ZHAO Xiao-qin, ZHENG Chang-ge

2008, 26(4):  291-298.  DOI: 10.7517/j.issn.1674-0475.2008.04.291

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Five asymmetry pentamethine cyanine dyes were synthesized and structured.Maxima of absorption and fluorescent spectra were at about 646—666 nm in methanol.Photobleaching experiment proved that photostability of the dye with asymmetry-substituted group was higher than that with symmetry-substituted group.Relation of fluorescent spectra and pH value indicated that the dye with phenyl-substituted group improved the photostability in acid or based solvents.

The Study on Preparation and Spectrum Properties of SrS:Eu,Sm

LIU Yan-ping, CHEN Zhao-yang, FAN Yan-wei, BA Wei-zhen, DU Yan-zhao, WANG Jun-hua

2008, 26(4):  299-304.  DOI: 10.7517/j.issn.1674-0475.2008.04.299

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SrS:Eu,Sm material was prepared by carbon reduction method.The effect of calcinations’temperature and time on luminescence intensity were studied.X-ray diffraction(XRD) tests prove that the synthetically materials have single phase and the samples prepared is with face-center cubic structure and the lattice parameter is 0.601 nm.The peak of sample excitation spectrum is at 272 nm,340 nm,and 466 nm.The peak of fluorescence spectrum is at 603 nm.The photo-stimulation luminescence spectrum of peak is at 608 nm.The optical stimulated luminescence spectral response range is between 800 and 1400 nm.

Recent Progress in Fluorene-Based Luminescent Materials:Towards Suppression of Aggregates and Green Emission

ZHAO Qian-jin, WU Wen-hui

2008, 26(4):  305-317.  DOI: 10.7517/j.issn.1674-0475.2008.04.305

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Polyfluorene(PFs) has been one of the most promising luminescent polymers during the past ten years.It has many advantages that favor its applications in polymer light-emitting diodes(PLEDs).On the other hand,some drawbacks such as PF’s chain aggregation and undesirable green color emission also confine its application.This paper describes the recent progress on PFs materials in which methods on the suppression of aggregates and green color emission is mainly discussed.

Synthesis,Characterization and Application of Hyperbranched Conjugated Polymer Containing Triphenylamine Unit

REN Wei-hua, LIU Feng, HU Jun, LIU Hong-lai

2008, 26(4):  318-326.  DOI: 10.7517/j.issn.1674-0475.2008.04.318

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The non-capped and capped hyperbranched conjugated polymers Poly(triphenylamine-p-Phenylenevinylenes) were obtained through a Wittig polycondensation.The structures of two copolymers were characterized.UV and PL spectra showed two hyperbranched conjugated polymers emited intensive green light in solution and film state.It is the first time to research their application in the fluorescence quenching ability of nitro compound,and the results showed high fluorescence quenching efficiency of the capped polymer towards o-NT,compared to non-capped product.When the concentration of o-NT was 21.5×10^-3 mol/L,its fluorescence quenching reached 97%.This kind of polymer exhibited great advantages in quenching efficiency and preparation,indicating the potential application value in the detection of nitro compounds.

Characteristic of a New Inhibitational/Accelerational Phenolic Resin Used to the Thermosensitive CTP Performance

SHA Xu-zheng, ZOU Ying-quan

2008, 26(4):  327-333.  DOI: 10.7517/j.issn.1674-0475.2008.04.327

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A new phenolic etherified resin was used as inhibitational /accelerational compound,which is synthesized by a phenolic resin and vinylether.It was applied to the composition of thermal sensitive coating of CTP,composed with photo-acid-generators,background dyes,binder resins,auxiliaries and solvents.The compositional chemistry and the imaging performance were studied.It was found that it could improve the thermal-sensitivity,developing,alkali resistance and anti-isopropanol ability of the thermal sensitive imaging layer of CTP plates,when it was properly used into the thermosensitive composition.