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Table of Content
20 February 1996, Volume 14 Issue 1
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ON THE PHOTOISOMERIZATION REACTION OF A NOVEL TYPE OF AZO-COMPOUNDS
WANG Fengqi, CHEN Hongfeng, WU Wei, ZHANG Jiancheng, LIU Xinhou
1996, 14(1): 1-3. DOI:
10.7517/j.issn.1674-0475.1996.01.1
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The photoisomerization reaction of a novel type of azo-Compounds was studied in chloroform.It is found that the electronic spectra of the new type of azo-Compounds,both cis and trans,are substantially redshifted.
Y-TYPE ZEOLITES AS MICRO-REACTORS FOR PHOTOCHEMICAL PREPARATION OF LARGE-RING COMPOUNDS
TONG Zhenhe(TUNG Chenho), WU Lizhu
1996, 14(1): 4-9. DOI:
10.7517/j.issn.1674-0475.1996.01.4
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The construction of macrocyclic compounds continues to be one of the main topics synthetic organic chemistry
[1]
. A bifunctional molecule may undergo either intramolecular ntermolecular reactions.
PHOTOCONDUCTIVITY STUDIES ON THE NEAR-IR SENSITIVE PHOTORECEPTORS Ⅱ.EFFECT OF CGL/CTL ENERGETIC ADAPTION ON THE PHOTOCONDUCTIVITY
LIU Guangning, WANG Yanqiao, REN Deyuan, QIU Jiabai
1996, 14(1): 10-13. DOI:
10.7517/j.issn.1674-0475.1996.01.10
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In the function-separated photoreceptor device,the carrier generation and carrier transport functions are separated into two discrete layers,the carriergeneration layer(CGL)and the carriertransport layer(CTL).We used vanadyl phthalocyanine as CGL material.Several CTL materials,such as perylene,oxadiazole,hydrazone derivative dyes were synthesized and then were coated over the CGL to be the function-separated photoreceptors,Their distinctive electrophotographic properties were examined,and the effect of CGL/CTL energetic adaption on the photoconductivities was investigated especially.
THE EFFECT OF HEAT TREATMENT ON THE VISCOSITY AND THE MOLECULAE WEIGHT DISTRIBUTION OF PHOTOGRAPHIC GELATINS
FU Yanxun, YANTiantang, RAO Xiuzhi
1996, 14(1): 14-19. DOI:
10.7517/j.issn.1674-0475.1996.01.14
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Thepaper presents a study on the effect of heat treatment on the viscosity and the molecular weight distribtuon of the four photographic gelatins.The experimental results indicate that the viscosity and the number average molecular weight of photographic gelatins are decreased when the heating temperature is increased.The viscosity and the number average molecular weight of photographic gelatins are closely related.Caused by decreasing of the number average molecular weight,the viscosity of photographic gelatins is decreased.Under our experimental condition,the critical heating temperature of inert gelatin and active gelatin is proposed less than 75℃ and less than 60℃ respectively for modified gelatin.
KINETICS OF DIFFUSION WITH CHEMICAL REACTION IN A GELATION LAYER Ⅵ.NUMERICAL MODELING OF SPHERICAL DIFFUSION AND SPHERICAL DIFFUSION WITH FIRST-ORDER REACTION
ZHANG Yongiun, ZHAOWenfang, XIA Peijie, REN Xinmin
1996, 14(1): 20-26. DOI:
10.7517/j.issn.1674-0475.1996.01.20
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Numerical solutions of kinetic equations delineating difusant’s spherical diffusion and spherical diffusion with a first-order reaction from surface of a particle in the space,by finite difference method,were given in this paper.With the same parameters and nearly the same boundary conditions,the numerical solutions were compared with the analytical solutions,and good agreement was shown.This effort provides the basis for investigating the formation of dye cloud in color imaging process.
ELECTROCHEMICAL INVESTIGATION OF HYPOCRELLIN IN DMF-H
2
O MIXED SYSTEM
WANG Weibo, LI Xueping, AN Jingyi, XIAO Xurui
1996, 14(1): 27-31. DOI:
10.7517/j.issn.1674-0475.1996.01.27
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The dectrochemical redox characteristics of hypocrellin A,B and 13-SO
3
Na-DDHA in DMF-H
2
O(
φ
=1)-mixed system were investigated.The results show/that that all correspond to two step one-electron reduction processes.For oil-soluble system HA and HB,the reactions are HA(HB)+e+H
+
=HAH
·
(HBH
·
)+e=HAH
-·
(HBH
-·
);for water-soluble system 13-SO
3
Na-DDHA,the reactions are(the first step)13-SO
3
NA-DDHA+e=13-SO
3
Na-DDHA,(protonatbn)13-SO
3
Na-DDHA
-·
+H
+
=13-SO
3
Na-DDHAH
·
,(the second step)13-SO
3
Na-DDHA
·
+e=13-SO
3
Na-DDHA
·
,respectively.And it was found that hypocrellin A,B semiquinone radical is very stable,while hypocrellin A sulfonate semiquinone radical is not very stable with a rate constant of disproportionation
k
f
=0.408.
STUDIRS ON THE CHARGE TRANSFER COMPLEXES OF N-ARYLMALEIMIDES WITH SODIUM THIOSULFATE
YING Baining, HONG Liping, JIN Yuren
1996, 14(1): 32-37. DOI:
10.7517/j.issn.1674-0475.1996.01.32
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The Charge transfer(CT)complexes formed between N-arylmaleimides(RPhMI)as the acceptors and thiosulfate anion(S
2
O
3
2-
) as donor in 95% DMSO/H
2
O were studied by UV-Vis spectroscopy.The electron affinities(EA)of RPhMI had been calculated from the CT spectra,And the formation constants(
K
)of the CT complexes were determined.The results indicate that weak acceptors,N-arylmaleimides could form stable CT complexes with the thiosulfate anion which acts as a strong donor,The possible structure of the CT complexes and the relationship of their stability and the substituent polarlity of RPHMI were discussed.
STUDIE ON WEAK INTERACTION BETWEEN AMP DERIVATIVE AND PYRIMIDINE BASES BY FLUORESCENCE QUENCHING──MODIFIED FORM OF STERN-VOLMER EQUATION FOR COMPETITIVE-ABSORPTION-SYSTEMS
FAN Ping, FAN Meigong
1996, 14(1): 38-43. DOI:
10.7517/j.issn.1674-0475.1996.01.38
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The fluorescence quenching of 8-azido-1,N
6
-ethene-5’-adenosine monophosphate(8-N
3
-E-AMP)bv thymine(T),uracil(U)and cytosine(C)at different temperature has been observed.The results indicate that the fluorescence quenching is not only due to the competitive absorption but also due to the formation of ground state complexes.The equations describing the fluorescence quenching in competitive-absorption-systems have been proposed.A modified form of Stern-Volmer equation is agreement with the results of experiments.
PHOTOCROSSLINKING OF NEGATIVE PS PLATE COATING
CAO Shuguang, WANG Renxiang, CAO Weixao
1996, 14(1): 44-47. DOI:
10.7517/j.issn.1674-0475.1996.01.44
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Pbotocrosslinhng of four kinds of negative PS plate coatings consisting of diazo-resin of diphenylamine and binder-resins has been studied.The results show that the photocrosslinking could only take place in the coatings which contain binder-resins involving hydroxygroup;The tentative mechamism of photocrosslinking has been proposed.The relationship of crosslinking and diazo-resin content in coating was also disscused.
PERYLENETETRACARBOXYLIC DIIMIDES AS ORGANIC PHOTOCONDUCTIVE MATERIALS FOR ELECTROPHOTOGRAPHY
LAN Minbo, LIU Yangang, REN Shengwu, WANG Yanqiao, QIU Jiabai, XIAO Xuriu
1996, 14(1): 48-53. DOI:
10.7517/j.issn.1674-0475.1996.01.48
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In this paper,the xerographic properties of a series of perylenetetracarboxylic diimides were reported.The results were shown that structure of the compounds and the vacum-deposited film affect their photoconductive properties.The planner molecular has better photoconductive property than others,The sensitivity of about
E
1/2
=1.75 at white light and
E
1/2
=1.4 at 780 nm are reached.This paper deal with the preparations and measurements of photoelectric characteristics of the photoreceptor.
ABSORPTION SPECTRA AND SURFACE ENHANCED RAMAN SCATTERING SPECTRA OF PORPHYRINS ADSORBED ON Ag SOLS
WANG Chuanyi, LIU Chunyan, YAN Xiaobin, HE Jianjun, ZHANG Manhua, SHEN Tao
1996, 14(1): 54-58. DOI:
10.7517/j.issn.1674-0475.1996.01.54
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The behaviof of two kinds of porphyrin derivatives,meso-5,10,15,20-tetra(4’-hydroxyphenyl)-porphyrin(T(4-HP))and meso-5-(4’-hydroxyphenyl)-10,15,20-triphenylporphyrin(HPTPP),absorbed on Ag sols was investigated by UV-vis spectra and surfcae enhanced Raman scattering spectra.There was obvious SERS effect when T(4-HP)P and HPTPP were adsorbed on the particle surface of the silver sol,meanwhile,a new peak located around 460 nm in absorption spectra was observed in our experiments.It was found that the two adsorbed porphyrin derivatives undergoing partial metal incorporation to form new compounds called"sittin-atop"(SAT)complexes.In addition,the differences in spectra of UV-vis absorption and SERS between T(4-HP)P and HPTPP were also discussed.
PHOTOREACTIONS OCCURRED ON THE SURFACE OF ZnO ULTRAFINE PARTICLE UNDER UV IRRADIATION
CHEN Sihai, REN Xinmin, U. Nickel
1996, 14(1): 59-64. DOI:
10.7517/j.issn.1674-0475.1996.01.59
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ZnO ultrafine particles were prepared in the presence of polyvinylpyrrolidone(PVP)and the photoreactions occurred on the surface of such particles under UV irradiation were studied through UV/Vis and fluorescence spectroscopy.In the presence of oxygen,it was found that new ZnO collloids were generated under UV irradiation when excess Zn
2+
ions were adsorbed on ZnO surface whereas only dissolution of ZnO was observed when OH
-
was in excess,The results of fluorescence quenching experiments suggest that Zn
2+
on the surface of ZnO acts as the visible fluorescence center of ZnO particles.
A STUDY OF LANGMUIR-BLODGETT FILM OF N,N,N’,N’-TETRABENZYL SUBSTITUTING SQUARAINE DYE
LI Jinru, LI Baofang, FAN Changyu, LI Xingchang
1996, 14(1): 65-69. DOI:
10.7517/j.issn.1674-0475.1996.01.65
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The squaraine dye 2-[4-(dibenzylamino)phenyl]-4-[4-(dibenzylimino)-2.5-cyclohexadienylidene]-3-oxo-1-cyclobuten-1-olate(NK2846)can be incorporated into composite monolayers with arachidic acid(C
20
)at the air-water interface.The composite monolayers including the dye can be transferred onto a glass slide with hydrophobic surface by vertical dipping method as typical Y films.The aggregation of the squaraine dye in the LB films was studied by absorption spectroscopy.It was found that the absorption curve of LB films with squaraine dye covers most of the visible region and extends to the near IR,because of the aggregation of dye molecules(or intermolecular interaction)in LB films.Polarized UV-visible spectroscopy indicated that there is partial anisotropy of dye molecules presentedin the layer plane.
1996, 14(1): 70-72. DOI:
10.7517/j.issn.1674-0475.1996.01.70
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1996, 14(1): 73-76. DOI:
10.7517/j.issn.1674-0475.1996.01.73
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1996, 14(1): 77-83. DOI:
10.7517/j.issn.1674-0475.1996.01.77
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1996, 14(1): 84-85. DOI:
10.7517/j.issn.1674-0475.1996.01.84
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1996, 14(1): 86-86. DOI:
10.7517/j.issn.1674-0475.1996.01.86
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1996, 14(1): 87-88. DOI:
10.7517/j.issn.1674-0475.1996.01.87
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1996, 14(1): 89-89. DOI:
10.7517/j.issn.1674-0475.1996.01.89
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1996, 14(1): 90-91. DOI:
10.7517/j.issn.1674-0475.1996.01.90
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1996, 14(1): 92-93. DOI:
10.7517/j.issn.1674-0475.1996.01.92
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