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Table of Content
20 November 1997, Volume 15 Issue 4
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SELECTIVE PHOTOOXIDATION OF
trans
,
trans
-1, 4-DIPHENYL-1, 3-DIBUTADIENE IN ZEOLITE ZSM-5
TONG Zhenhe(TUNG Chen-ho), WANG Hongwei
1997, 15(4): 289-292. DOI:
10.7517/j.issn.1674-0475.1997.04.289
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Selectivity in organic photo transformations continues to be one of the main topics of current interest
[1]
.Of the various approaches use of organized and const rained media had shown considerable promise
[2]
.Molecular-sieve zeolites represent a novel and unique class of materials
[3]
.This material may be regarded as open structures of silica in which silicon has been substituted by aluminum in a well-defined fraction of the tetrahe-dral sites.The frameworks thus obtained contain pores,channels,and cages of different dimensions and shapes.The pores and cages can accommodate,selectively according to size/shape,a variety of organic molecules of photochemical interest,and provide restrictions on the motions of the included guest molecules and reaction intermediates.For example,the internal surface of ZSM-5 consists of two types of pore systems (channels)
[3]
:one is sinusoidal w ith a near circular cross section of ca.0.55 nm,and the other is straight and perpendicular to the sinusoidal channels.The straight channels are roughly elliptical with dimensions of ca.0.52?0.58 nm.Those channels of ZMS-5 can allow the adsorption of benzene and other molecules of similar molecular size,but prevent molecules which possess a larger size/shape from being sorbed into the internal framework.
PHOTOELECTRICAL PERFORMANCE STUDY OF NANOCRYSTALLING TiO
2
FILM SENSITIZED BY PHENYL-PHOSPHONATED POLYPYRIDYL RUTHENIUM COMPLEX
YANG Rong, WANG Weibo, JING Bingwen, XIAO Xurui, ZHANG Manhua, SHEN Tao
1997, 15(4): 293-296. DOI:
10.7517/j.issn.1674-0475.1997.04.293
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Thiocyanato (4,4'-dimethy1-2,2-bipyridyl)(4'-phenylphosphonate-terpyridyl) ruthenium(Ⅱ) was prepared and characterized with respect to its absorption, luminecence, and emission lifetime. The new dye with phosphonate absorption group can act as efficient charge-transfer sensitizer for nanocrystalline TiO
2
film illustrated by the high quantum yield of charge injection from the excited dye to the conduction band of TiO
2
. Nanocrystalline TiO
2
film coated with monolayer of the prepared dye harvests visible light efficiently with the maximum LHE of 89.5% at 503 nm, And thus fabricated sensitized TiO
2
solar cell have a light to electric energy conversion efficiency of 3.1%, with 0.66V open circuit photovoltage and 4.4 mA/cm
2
short-circuit photocurrent. Study on the photocurrent action spectrum of the new dye sensitized TiO
2
film shows that the absorption group of the sensitizer has a strong influence on the photoelectrical performance of the film electrode.
STUDY ON THE PREPARATION AND PROPERTY OF NOVEL HOLLOW-GRAIN SILVER HALIDE EMULSIONSⅠ. THE PREPARATION AND OBSERVATION OF HOLLOW-GRAIN SILVER HALIDE EMULSIONS
LU Yi, JIANG Lei, WANG Sue
1997, 15(4): 297-302. DOI:
10.7517/j.issn.1674-0475.1997.04.297
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Several kinds of hollow silver halide microcrystals were prepared by the methods of halogen displacement and epitaxial growth. The holes in the hollow silver halide microcrystals were observed by Scanning Electron Microscope. It is found that by the means of Br-I and Cl-I halogen displacement, hollow grains can be formed when relatively small amount of KI is added to the system, while of Cl-Br displacement, hollow grains appear only when theoretical degree of displacement is higher.
A POSITIVELY CHARGED ORGANIC PHOTOCONDUCTIVESYSTEM BY USING HIGH CONSENTRATED TNF-DOPEDPOLYMER MATRIX AS ITS CHARGE TRANSPORT LAYER
PU Jialing, JIAO Wenhua
1997, 15(4): 303-308. DOI:
10.7517/j.issn.1674-0475.1997.04.303
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An organic conductive system was made by using densely TNF-doped polymer matrix in its charge
trans
port layer(CTL) and
ε
CuPc dispersion in its charge generation layer(CGL). Polymer films with various TNF concentrations(10~50%)remained completely
trans
parent even after 8 h drying at 80℃ followed by nearly half year adaptation. This implies that the traditional difficulties of TNF, such as poor compatibility with traditional polymer matrix and consequently the unreality of doping at high concentration, were resolved in a good fashion. It was experimentally found that the photoreceptor has a good charge acceptance as manifested by its saturated surface potentials of ever lower than +950 V for all investigated TNF concentrations and that the dark decay can be restrained down to 3.3 V/s by adjusting the type of polymer used in CGL. The photoreceptor showed good photosensitivities in the whole visible spectrum with pronounced peaks occurring at 550, 650, and 750 nm. The half decay exposures at 750 and 820 nm were 1.93 μJ/cm
2
and 2.81 μJ/cm
2
,respectively.
STRUCTRAL CHARACTERIZATION OF TWO CORE COMPLEXES FROM PHYCOBILISOME IN SPIRULIA PLATENSIS
WANG Hui, ZHAO Jingquan, JIANG Lijin
1997, 15(4): 309-313. DOI:
10.7517/j.issn.1674-0475.1997.04.309
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Two different core complexes: APCR and APC were isolated from phycobilisome(PBS)of spirulia platensis, and were characterizated their structure and spectra with respect to absorption, second derivative spectra and fluorecence spectra. Then discussed the effects of severial linker polipeptides(L
29.5
,L
C
8.9
and LCM)on the structuer and function of these two supermolecular complexes, the sedimentation constants of which are 36S and 16S respectively.
NMR AND SPECTROSCOPIC STUDY ON 2,4-BIS(1-ALKYL-3,3-DIMETHYL-2-INDOLINYLIDENEMETHYL)-CYCLOBUTENEDIYLIUM-1,3-DIOLATE DYES
LI Yiting, ZHOU Jinwei, ZHANG Fushi, WANG Yanqiao, SONG Xinqi
1997, 15(4): 314-320. DOI:
10.7517/j.issn.1674-0475.1997.04.314
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The structural characteristics and solvent effect on the absorption and fluorescence emission spectra of squaraine dyes are studied by their NMR, UV-VIS, and fluorescence spectra. The results indicate that the positive solvatochromism of these compounds are not obvious as expected and their structure and configuration in the ground state as well as the excited state are nearly the same. The whole molecule is in a nearly planar form and has a huge conjugate system. The relationships between molecular structure and charge distribution in the molecule, emission spectral feature are analyzed.
SYNTHESIS AND PROPERTIES OF SQUARYLIUM CYANINE DYES CONTAINING N-ALKYL INDOLE
WANG Wei, YAO Zuguang
1997, 15(4): 321-326. DOI:
10.7517/j.issn.1674-0475.1997.04.321
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Seven squarylium indocyanine dyes with different N-alkyl group were synthesized. Their structures were confirmed by IR,
1
H NMR, MS spectroscopy and element analysis. Absorption spectra, melting points, solubilities and photofading were also studied. It was found that introducing squaric bridge in conjugated chain improved photostabilities. Influence of N-alkyl groups on
λ
max
were weak, but were great on solubilities and melting point. The group with branched chain on nitrogen atom having good solutilities was found.
EFFECTS OF THIACARBOCYANINE AND INDOCARBO-CYANINE DYE WITH DIFFERENT SUBSTITUENTS ON ABSORPTION TO AgBr MICROCRYSTAL AND SIZE DISTRIBUTION OF J-AGGREGATES
ZHAO Wenfang, SAIJO H, KOBAYASHI Y., SHIOJIRI M., YAN Wenpeng, LI Qun, PENG Bixian
1997, 15(4): 327-334. DOI:
10.7517/j.issn.1674-0475.1997.04.327
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Effects of thiacarbocyanine and indocarbocyanine dye with different substituents on absorption to AgBr microcrystal and on size distributions of J-aggregates by ACFEM were investigated. The results show that adsorbability of indocarbocyanin iodide dye on the cubic AgBr is larger than that on the T-grain AgBr. But adsorbability of thiacarbocyanine triethyl ammonium salt dye on the T-grain AgBr is larger than that on the cubic AgBr. In addition, adsorbability of 5 substituted thiacarbocyanine dye either on T-grain or on cubic AgBr much larger than that of 5-unsubstituted thiacar bocyanine dye.In present paper,It is also proved further that the growth of J-aggregates on AgBr could be regarded as the Ostwald ripening of the J-aggregate and that N-ethyl substit uent leads to strong J-aggregation.It also indicated that the average sizes of J-aggregations of 5-substituted thiacarbocy anine dye are larger than that of 5-unsubstituted one.
PHOTOINDUCED ELECTRON TRANSFER AND CHARGE SEPARATION——COMPARISON OF PHOTOPHYSICAL PROPERTIES OF N-[(1-PYRENYL)-METHYLENE]-N-METHYLANILINE AND N-[(1-PYRENYL)-ETHYLENE]-N-METHYLANILINE
CHEN Bin, WANG Xuesong, ZHANG Baowen, CAO Yi
1997, 15(4): 335-342. DOI:
10.7517/j.issn.1674-0475.1997.04.335
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Two kinds of binary compounds containing pyrene and aniline moiety were designed and synthesized, and the influence of solvent polarity and viscosity on the formation of their intramolecular exciplex was investigated. Furthermore, the photophysical behavior in CTAB micelle reveals the potential of using them to probe the viscosity and polarity of microenviroments.
THE INFLUENCE OF MOLECULAR CHAIN STRUCTUREON STABILITY AGAINST PHOTOOXIDATION OFNEAR-INFRARED ABSORBING CYANINE DYES
LI Jun, CHEN Ping, ZHAO Jiang, ZHENG Deshui, TSUNEKI Okazaki, MASAAKI Hayami
1997, 15(4): 343-350. DOI:
10.7517/j.issn.1674-0475.1997.04.343
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The spectroscopic properties and photostability of six near-infrared absorbing cyanine dyes with indolenine and quinoline heterocyclic stem nuclei structure have been studied. The experimental results showed that photofading of cyanine dyes was mainly caused by photooxidation, and their photostability increased significantly when the cyclic unity was introduced into the polymethine chain, and their photostability decreased when the length of polymethine chain was increased.The formation of singlet oxygen and superoxide radical photosensitized was detected by spin-trapping experiment.
LASER INDUCED FLUORESCENCE ATTENUATION PROBES THE KINETIC PROCESS OF PHOTOCHEMICAL REACTION
WANG Wenke, WEI Jie, HUANG Yuli
1997, 15(4): 351-356. DOI:
10.7517/j.issn.1674-0475.1997.04.351
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The kinetic process of photochemical reaction of diazophthopuinon system was studied by laser induced fluorescence attenuation. The nonlinear relation between photodecomposion of the system and laser power was observed and investigated in detail at 457.9 nm laser line. It is found that the final product of the reaction mentioned above strongly fluoresces and that it peaks at 567.0 nm while the diazonaphthoquinon peaks at 589.3 nm.
1997, 15(4): 357-362. DOI:
10.7517/j.issn.1674-0475.1997.04.357
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1997, 15(4): 363-370. DOI:
10.7517/j.issn.1674-0475.1997.04.363
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1997, 15(4): 371-374. DOI:
10.7517/j.issn.1674-0475.1997.04.371
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