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Table of Content
20 May 1995, Volume 13 Issue 2
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SPECTROMETRIC STUDY OF SIZE QUANTIZATION EFFECTS OF ULTRAFINE SULFIDE SEMICONDUCTOR PARTICLES
FAN CHANG-YU, LIXUE-PING, ZHANG ZHEN-ZONG, XIAO XU-RUI
1995, 13(2): 97-102. DOI:
10.7517/j.issn.1674-0475.1995.02.97
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Nanometer sized sulfide semiconductor ultrafine particles(CdS,ZnS,PbS and Bi
2
S
3
)were prepared in aqueous solution by colloidal chemical methods. The particle sizes deter-mined by TEM are below 10 nm. The size quantum effects and optical properties of theresulfide ultrafine particles as well as the influence of the chemical enviroment and conditionparameters of particle formation in the preparation procedure were studied in detail.Significant changes were observed in optical absorption and Raman spectra.When add suitable surface modification agents and stabilizers,keep the solution pH in suitable range, present anexcess of metal ions,it can be found that the absorption edges shift to the shorter wave-length and pronounced structrued peaks exhibit,and characteristic resonance Raman peaks(for CdS particles)gradually decrease,indicating the decrease of particle sizes and clear sizequantum effects.
NOVEL DYE PHOTOSENSITIZATION SYSTEMS---SPECTROSCOPIC STUDY OF FLUORESCEIN DYE IODONIUM SALTS
ZHOU WEN-HUI, HEJUN-HUI, LI MIAO-ZHEN, WANG ER-JIAN
1995, 13(2): 103-110. DOI:
10.7517/j.issn.1674-0475.1995.02.103
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In this work,a series of fluorescein dye idonium salts were synthesized and their spectral and photochemical properties were studied.Results show that their spectral propertiescan be changed through the variation of their own structures.
I
Ⅰ
/
I
Ⅱ
was proposed to compare the relative degree of dissociation of these compounds in solvents. With increasing thesolvent polarity,the steric hindrance around the C- 6 position and the number of eletronwithdrawing groups, the
I
Ⅰ
/
I
Ⅱ
value increases,so does the relative degree of dissociation.Followingly, the spectral properties change significantly and the rate of photoreaction decreases. The concentration of dye iodonium salts has different effects on their spectral andphotochemical properties in polar and nonpolar solvents respectively. It is shown that thesecompounds may not only be used as photoinitiators for photopolymerization and photocrosslinking,but also as probes for studing the enviromental properties.
EXCIPLEX FORMATION AND ENERGY TRANSFER OF ANTHRACENE-DICYANOVINYLBENZENE
CHEN JING-RONG, ZHANG BAO-WEN, CAO YI
1995, 13(2): 111-116. DOI:
10.7517/j.issn.1674-0475.1995.02.111
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Three anthracene-dicyanovinyl benzene compounds with different length spacer were designed and synthesized. The mechanism of the intramolecular electron transfer of An-DCVB was investigated with absorption, fluorescence spectra,laser flash photolysis and single photon counting. Upon irradiation, intramolecular electron transfer from moiety An to DCVB occurred, exciplex formed and triplet energy transfer took place.The influences of thelength spacer on molecular conformation, exciplex formation and triplet energy transfer were discussed.
UV LASER DESORPTION/IONIZATION TIME-OF-FLIGHT MASS SPECTROMETRY OF AROMATIC MOLECULES
WANGXUE-FENG, WANG ZHI-LIN, QIN QI-ZONG, LI HAI-YANG, MA CHEN-SHENG, BAI JI-IING
1995, 13(2): 117-121. DOI:
10.7517/j.issn.1674-0475.1995.02.117
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Time-of-flight mass spectrometry of several aromatic molecules were investigated in onestep UV laser desorption/ionization. Results show that benzo[e]pyrene is softly-ionized byresonant two-photo ionization, and that fluoranthene is ionized via three-photo ionization.2,5-dihydrobenzic acid and cinnamic acid can also be ionized by pulsed UV laser and molecule-ion reactions occured during desorption and ionization processes.
COUPLING REACTION IN ORGANIZED MEDIUM Ⅱ. SOLVENT EFFECT ON KINETICS OF COUPLING REACTION
ZHANG YONG-JUN, ZHAO WEN-FANG, HU PING, REN XIN-MIN
1995, 13(2): 122-128. DOI:
10.7517/j.issn.1674-0475.1995.02.122
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A flow apparatus and a numerical model were used to measure the rate constants of thecoupling reaction of dispersed couplers dissolved in DBP, DEIJA and TBP with 4 QDIs respectively in gelatin layer.The results show that the dispersion solvents have great effect oncoupling kinetics. In general,coupling rate constants decreases in the order KDBP>KTBP> KDEDA, when they were used as a dispersion solvent respectively. The results also show that when dispersion solvent is different, the activity order of 4 QDIs is different. The discussion was given in the view of reaction in organized medium.
PHOTO INDUCED VALENCE ISOMERIZATION OFNORBORNADIENE IN POLYMER SYSTEMS
WANG XUE-SONG, ZHANG BAO-WEN, CAO YI
1995, 13(2): 129-135. DOI:
10.7517/j.issn.1674-0475.1995.02.129
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A copolymer bearing norbornadiene and carbazole as pendants was synthesized and apolymer only having norbornadiene pendants was also prepared for comparision. The valenceisomerization of the norbornadiene molety to quadricy clane moiety proceeded smoothly when the two kinds of polymers were irradiated with the light below 350nm. If the wavelength ofthe incident light was above 350nm, the isomerization reaction was only found in copolymersystem. Utilizing fluorescence quenching experiment and CIDNP technique, the mechanismof sensitized valence isomerization was studied. The isomerization of quadricyclane moiety tonorbornadiene moiety was also achieved by using trifluoroacetic acid as catalyst.
STUDY ON THE PHOTO OXIDATlON MECHANlSMOF POLYMETHYLENE CHAIN CYANINE DYES
ZENG WAN-XUZ, CHEN PING, ZHENG DE-SHUI, TSUNEKI OKASAKI, MASAAKI HAYAMI
1995, 13(2): 136-143. DOI:
10.7517/j.issn.1674-0475.1995.02.136
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In this paper, the photcoxidation mechanisms of polymethylene chain cyanine dyes were studied by U-V spectroscopy and Electron Spin Resonance (ESR). It was revealed that singlet oxygen (
1
O
2
)、 superoxide were the main factors causing the photofading of dyes ,and dye
-
would cause the photofading of dyes without oxygen.
STUDY ON THE DEVELOPMENT KINETICS OF SUPER HIGH CONTRAST SYSTEM
LIU QUAN, LI LI
1995, 13(2): 144-150. DOI:
10.7517/j.issn.1674-0475.1995.02.144
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This paper deals with kinetics of hydrazine-promoted infectious development by meansof measurements and calculations of development rate and activation energy,mechanism isdiscussed at the same time. The experimental results are as follows:direct development withlow activation energy dominates early stage of development;the later stage is fogging nucleation with high activation energy;there is no development of fogging nucleation for low exposured latent nucleus,but with higher activation energy;the results of super high contrastand short toe are the competition between development acceleration and retardation.
CALIXE[4] ARENE AS A TEMPLATE FOR CONTROLLING REGIOCHEMISTRY OF PHOTODIMERIZATION OF9-SUBSTITUTED ANTHRACENE
LI YI, TONG ZHEN-HE(CHEN-HO TUNG), WANG GUO-QIANG, HUANG ZHI-TANG
1995, 13(2): 151-153. DOI:
10.7517/j.issn.1674-0475.1995.02.151
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Photodimerization of anthracene and its derivatives has been extensively investigated
[1]
.In general,irradiation of 9-substituted anthracene in organic solvents results in the dimerization of the aromatic rings at 9,10-positions to yield head-to-tail (h-t) rather than head(h-h)photodimers
[2]
.
PHOTO ELECTROCHEMICAL PROPERTY STUDY OF THEDOPED TiO
2
FILMS PREPARED BY SOL-GEL PROCESS
XU LING-GE, LI TIAN-KAI, WANG SHU-QIN, XU WEI-BING
1995, 13(2): 154-160. DOI:
10.7517/j.issn.1674-0475.1995.02.154
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It is reported in this paper that the TiO
2
films doped Zn
2+
, Cd
2+
,Al
3+
, Ni
2+
, Fe
3+
and Cr
3+
ions were prepared by sol-gel process. Photoelectrochemical properties of these filmswere studied and the characteristics of their absorption spectra and diffuse reflectance in-frared spectra (DRIFTS) were also analysed.
SYNTHESIS AND PHOTOCHROMISM OF N-PHENYL-2, 3-BIS-[3-(1-ETHYL- 2-METHYLINDOYL)]-MALEIMIDE
YU LIAN-HE, ZHAO WEI-LI, FAN MEI-GONG, ZHU ZI-QIANG
1995, 13(2): 161-165. DOI:
10.7517/j.issn.1674-0475.1995.02.161
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N-phenyl-2,3-bis- [3-(1-ethyl-2-methyl-indoyl)]-maleimide (Compound I)was synthesized and its structure was characterized. Photochromic Property of compound I was examined by steady state and laser flash photolysis techniques. The resuhs indicate that, withthe excitation of 248nm laser pulse, I shows photochromisrn in acetonitrile, and the transientabsorption of the photopreduct was observed (λ
max
= 610nm), but in steady state experiment, no photochromic product of I can be detected after irradiation with either 366nm or450nm light. The reason is probably that the photopreduct is unstable, in other words, itslifetime is too short to be detected with steady state method.
STUDY ON THE PHOTOVOLTAIC BEHAVIOUS OF L-B FILMS OF TETRATERT-BUTYL-PHTHALOCYANINE DERIVATIVES
DONG CHANG-ZHENG, SHEN YONG-JIA, LAN MIN-BO, REN SHENG-WU, XIAn XU-RUi, LIN YUAN, JIA JIAN-GUANG, SHFN TAO
1995, 13(2): 166-169. DOI:
10.7517/j.issn.1674-0475.1995.02.166
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The ITO electrodes were modified by tetratert-butyl-phthlocyanines with different metallo-substitutes[(
t
-Bu)
4
.PcM, M = Cu, Sn, AlCl, VO)]by L-B technique. The formationof a stable mono-layer on water and characteristics of phases transition were observed. The photo-voltaic behaviour and adsorption spectra of mono-layer assemblies were measured. Theresults showed that the metallo-substitutes have great effects on the adsorption spectra andphoto-voltaic behaviour of L-B films.
OBSERVATION OF THE PHYCOBILISOME’S MORPHOLOGYWITH SCANNING TUNNELLING MICROSCOPE
LIN RUI-FENG
1995, 13(2): 170-172. DOI:
10.7517/j.issn.1674-0475.1995.02.170
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The shape of the phycobilisome of polysiphonia urceolata was studied by using scanningtunnelling microscope (STM ). The STM image indicates that the phycobilisome is hemi-ellipsoidal and it’s size is about 50nm. The results also show that the sequences of phyco-biliproteins are observed and the phycobiliproein size is about 8nm.
THE SENSITIZATION OF HYDROXY-TETRAAZAINDENEIN SILVER CHLORIDE EMULSION
ZHENG JUN-PING, SHENG LI-QIN, ZHENG DE-SHUI, CHEN PING
1995, 13(2): 173-179. DOI:
10.7517/j.issn.1674-0475.1995.02.173
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The sensitization and fog-inhibition of hydroxy-tetraazaindene (TAI) was obtained asTAI was introduced into the AgCl emulsion. The varied amounts of Na
2
S
2
O
3
in the emulsion have little effect on the sensitization of TAI. The degree of sensitization by TAI varies with the amounts of its addition. The mechanism of the sensitization of TAI was studied by the exposing and the developing experiment. The results indicated that the sensitization of TAIwas not arose from developing process but from the effect of TAI on the latent image formatiom.It was suggested that the addition of TAI probably suppressed recombination of Ag
2
S
+
with photoelectrons by the results of IR spectra, cyclic voltammetry, and dielectric loss experiments, which might lead to the increase of the sensitivity of the AgCI emulsion.
A STUDY ON THE MICELLAR VISCOS1TY IN SURFACTANTSOLUTION BY FLUORESCENCE POLARIZATION
JIANG YONG-CAI, WU SHI-KANG
1995, 13(2): 180-185. DOI:
10.7517/j.issn.1674-0475.1995.02.180
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In this work the microviscosity measurement for inner nuclei of micelles from two different surfactants were studies comparatively by fluorescence polarization with three different probes. The results indicate that the viscosity measured by the fluorescence puobe DMAmay represent the properties of micellar nuclei correctly. In addition,the structure of aggregate from the mixed cationlanion surfactant (1 : 1) has a closer-packing of surfactantmolecules. Hence it has a large η value as well as a large relaxation time than that from thesingle surfactant micelle.
1995, 13(2): 186-188. DOI:
10.7517/j.issn.1674-0475.1995.02.186
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1995, 13(2): 189-190. DOI:
10.7517/j.issn.1674-0475.1995.02.189
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1995, 13(2): 191-192. DOI:
10.7517/j.issn.1674-0475.1995.02.191
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