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Table of Content

    20 August 1995, Volume 13 Issue 3
    SPECTROSCOPIC STUDY OF 1,3-SUBSTITUTED SQUARIC ACID DERIVATIVES AND ITS DIMER,AGGREGATE FORMATION
    ZHOU XIN, ZHANG BAO-WEN, CAO YI
    1995, 13(3):  193-199.  DOI: 10.7517/j.issn.1674-0475.1995.03.193
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    The compounds 1,3-bis(4-dimethyaminopheny1)-2,4-dihydroxy-dihydroxide cy-clobutenediylium bis(inner salt)[DMCS]and 1,3-bis(4-dihexadecylaminopheny1)-2,4-di-hydroxy-dihydroxide cyclobutenediylium bis(inner salt)[DHCS]were synthesized.The photophysical behaviors of DMCS and DHCS in different solvents were studied and their differences of dipole moment between ground state and excited state were calculated.Dimer ofDMCS in CTAB and aggregate of DHCS in dioxane-water were investigated and criticalaggegation composition(CΨ)and critical aggregation concentration(CA)of DHCS weremeasured.
    PHOTOCHEMICAL REACTION OF DINITROPYRENES UNDER SIMULATED ATMOSPHERIC CONDITION
    WANG HAI, ZHANG ZHI-JIA, XU XIAO-BAI
    1995, 13(3):  200-206.  DOI: 10.7517/j.issn.1674-0475.1995.03.200
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    Photo reaction of dinitropyrenes in simulated atmospheric conditions was studied.The photochemical reaction rate was found to be of the second order.Different reactionrates correspond to different dinitropyrene isomers and to different carrier gases with possibly the competition of the quenching and oxidation by oxygen.The photoreaction productswere identified as pyrenequinone,multi-,and mono-nitrohydroxypyrenes,dipyrenone etc.The mutagenicity of photochemical reaction products is lower than that of the original dini-tropyrenes.
    SYNTHESIS OF DONOR-BA-ACCEPTER SYSTEMS AND INVESTIGATION OF PHOTOINDUCED INTRA MOLECULAR ELECTRON TRANSFER
    LI SHUN-LAI, DONG XIAO-YANG, XU HUI-JUN
    1995, 13(3):  207-213.  DOI: 10.7517/j.issn.1674-0475.1995.03.207
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    A series of donor-accepter systems linked by bisphenol A were synthesized in this paper.The electron donor is 9,10-dimethoxyanthracene.The dependence of photo induced electron transfer rates on the exothermicity of the reaction was studied.The rate constantsof photo induced electron transfer in these systems first increase with decreasing free energychange up to A △G value of-1 eV,thereafter the rate constants of electron transfer remainalmost unchanged as the value of △G decreases.The result is in consistent with Rehm-Weller relationship.
    STM STUDY OF POROUS SILICON FORMED BY ELECTROCHEMICAL ANODIC OXIDATION
    YIN FENG, LIN RUI-FENG, LI XUE-PING, XIAO XU-RUI
    1995, 13(3):  214-219.  DOI: 10.7517/j.issn.1674-0475.1995.03.214
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    Scanning tunneling microscopy(STM)combined with fast Fourier transforms(FFT)and data simulation methods were used to examine the surface morphology and microstructure of porous silicon(PS)formed by electrochemical anodic oxidation.The relation betweenmicrostructure and characteristics of electrochemistry and photoluminescence was studied.The results showed that with the increase of etching current density the micropores expanded in the depth direction and the thickness of porous layer enhanced and the remaining Sicolumns became thiner. Corresponding to the change of the microstructure the luminescentintensity increased and the peak shifted toward shorter wavelength with increasing currentdensity, In contrast to crystal Si the flatband potential of PS was more negative and the cur-rent densities in cathodic and anodic region were increased simultaneously.
    STUDY ON FOG DEVELOPMENT OF SILVER HALIDE MICROCRYSTALS
    YANG XIN-MIN, TANG DA-GANG
    1995, 13(3):  220-226.  DOI: 10.7517/j.issn.1674-0475.1995.03.220
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    The fog development of silver halide emulsion with sensitizers of of sulphur and gold indevolopers D-19b and CD-4 were studied.The experimental results showed that the fogdensity produced by both sensitizers of sulphur and gold in D-19b developer is greater thanthat in CD-4 one,Moreover,in some sulphur levels the fog produced by sulphur sensitization is much larger than that gold sensitization in the developer D-19b,and whereas it issmaller in the developer CD-4 in comparison with that by the same gold level sensitization.These results were in consonant with the study of the fog developing dynamics of sulphurand gold sensitization in the developers D-19b and CD-4.These results indicated that sulphur sensitization is distinctly diffrent from gold one for the influence on the fog formation in the fog developing processes.The fog formation rate constants of the emulsion with the sensitizer of sulphur is greater than one with sensitizer of gold,and the fog development activation energy of the emulsion with sensitizer of sulphur is smaller than one with the sensitizerof gold in the developer D-19b.Conversely,the fog formation rate constants of the emulsionwith sensitizer of sulphur is smaller than one with sensitizer gold,and the fog development activation energy of the emulsion with sensitizer of sulphur is greater than one with sensitizergold in the developer CD-4.
    ESR STUDY OF MV2+ PHOTOREDUCTION ON THE SURFACE OF NANOMETER-SIZED CdS
    YANG JIAN-JUN, FENG LIANG-BO, ZHANG ZHI-JUN, JIN ZHEN-SHENG
    1995, 13(3):  227-233.  DOI: 10.7517/j.issn.1674-0475.1995.03.227
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    The photoreduction of MV2+ on the surface of nanometer-sized CdS was investigatedby means of ESR. Under illumination of the nanometer-sized CdS dispersion in 1.1×10-3mol/L MV2+ ethanol solution the photoreduction rate of MV2+ on CdS surface keeps constant and the dimerization rate of the photoreduction product MVobeys the law of secondorder reaction.The results obtained also show that the dissolved O2- in ethanol solution or the ionosorbed oxygen on CdS surface has inhibiting action on the photo reduction of MV2+.
    THE KINETIC STUDIES ON CYCLIZATION OF STYRENE-ISOPRENE RUBBER
    SUN XIAO-RI, GU JIANG-NAN, YU SHANG-XIAN, LI DA-ZHEN
    1995, 13(3):  234-240.  DOI: 10.7517/j.issn.1674-0475.1995.03.234
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    The kinetics of the cyclization of styrene-isoprene rubber has been investigated by IRspectrum. Some kinetic parameters of this cyclization are determined.Reaction order n=1,apparent activation energy Ea=53.2 kJ·mol-1,preexponential factor A=2.24×106min-1.The structure of cyclized styrene-isoprene rubber was analysed by 1H NMR experiments.The possible mechanisms of this cyclization have been suggested and discussed.
    FLUORESCENCE SPECTRA AND PHOTOLYSIS OF COMPOUNDS CONTAINING SULFUR
    SU JING-JING, DAI GUANG-SONG, WU SHI-KANG
    1995, 13(3):  241-247.  DOI: 10.7517/j.issn.1674-0475.1995.03.241
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    In this work sphenyl 1-thionapthoate and 2-benzoylthiobenzothiazole were synthesized and their pbotochemical and photophysical behavior were studied.Due to introductionof naphthyl and benzothiazolyl group,the absorption range of these compounds have beenefficiently broadened.It was discovered in this work that the intensity of sphenyl 1-thion-aphthoate increased with time interval of irradiation,which was because of production of α,α'-binaphthyl with high fluorescence quantum yield.However,the phenomenon could notbe observed in photolysis of 2-benzoylthiobenzothiazole.Cage effect and external magneticfield effect also were discussed in this paper.
    SYNTHESES OF AZETIDINES VIA PHOTOCYCLOADDITION OF C=C TO C=N DOUBLE BONDS
    FENG JUN, MING YANG-FU, FAN MEI-GONG
    1995, 13(3):  248-250.  DOI: 10.7517/j.issn.1674-0475.1995.03.248
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    The photocycloaddition of 6-azauracil (AU) with olefins have been carried out. Four new compounds,1,2,4-triazabicyclo [4,2,0] octane and 1,2,4-triazatricyclo [4,2,01.6,07.12]dodecane derivatives,were obtained. Based on structure identificationof productsand photosensitization behavior of this syste,the regioselection and the multiplicity of thisreaction were discussed.
    1995, 13(3):  251-253.  DOI: 10.7517/j.issn.1674-0475.1995.03.251
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    STUDY ON THE MONODISPERSITY OF TABULAR SILVER HALIDE GRAINS
    WANG RONG-QIN, YANG GAN, PENG Bi-XIAN, WANG JUN
    1995, 13(3):  254-257.  DOI: 10.7517/j.issn.1674-0475.1995.03.254
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    A monodispersed tabular grain emulsion was prepared successfully by pAg-controlled double-jet methds,The functions of pBr,addition time of aqueous solutions of silver nitrate and halide,ripening time,concentration of gelatin,content of iodide and so on were investigated in this work.The results were observed that number of the hexagonal tabulargrains was 92% of the number of the whole silver halide grains and the diameter of circle corresponding to the average projected area of the tabular grains was 1.2μm and the aspectratio was 14.The results indicate that the nucleus formation and ripening stages have important function for preparing monodispersion tabular grains.
    1995, 13(3):  258-272.  DOI: 10.7517/j.issn.1674-0475.1995.03.258
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    INVESTIGATION OF TWO-LAYER ORGANIC SOLAR CELLS COMPOSED BY PHTHALOCYANINES AND PERYLENE DERIVATIVE
    DONG CHANG-ZHENG, WANG WEI-BO, LAN-MIN-BO, REN SHENG-WU, XIAO XU-RuI, ZHOU QING-FU, XU HUI-JUN
    1995, 13(3):  273-276.  DOI: 10.7517/j.issn.1674-0475.1995.03.273
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    Photovoltaic properties of two-layer organic thin film solar cells were investigated.Phthalocyanines(MPc)and perylene derivative(PTC)were employed for P-type and N-typelayers,respectively.PTC and MPc dyes were deposited on an indium tin oxide(ITO)coat-ed glass by conventional vacuum evaporation.The results show that the conversion efficiencies of the cells were affected by different kinds of MPc.
    CHEMICAL SENSITIZATION OF TABULAR-GRAIN EMUL-SIONS IN THE PRESENCE OF SENSITIZING DYE
    WEIDE VICTOR YANG
    1995, 13(3):  277-285.  DOI: 10.7517/j.issn.1674-0475.1995.03.277
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    Investigations sensitometry,were made via the study of crystal morphologies,turbidity measurement spectrometry,and dye leaching test.
    1995, 13(3):  286-288.  DOI: 10.7517/j.issn.1674-0475.1995.03.286
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