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Progress in Chemistry 2001, No.06 Previous issue Next issue

In this issue:

Review
Problems in the Study of Electro-Lum inescence Devices Based on Phosphorescent Dyes
Wu Shikang,Zhang Xiaohong, Li Shutang
2001, 13 (06): 413- |
Published: 24 November 2001
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Abstract
From the photophysical and photochemical points of view , the basic problems of phospho2rescent emission electrolum inescence devices have been discussed briefly in this review. A series of problems such as the emission layer material selection, the exciton formation and its migration with in different transportation layer, the energy transfer between host and guest molecules and the condition of phosphorescence emission are involved. Key points concerned with the device design and preparation are also discussed concisely.
Progress in Interfacial Photochemical Reactions
Gong Haofei,LüQing,Liu Minghua*
2001, 13 (06): 420- |
Published: 24 November 2001
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Abstract
The basic character and the different types of photochemical reaction sat the inerfaces of air water and LB films are described. The latest progress in recent years are outlined in the fields of photopolymerization at interfaces, photochromism at in terfaces, photoinduced electron and charge transfer at interfaces. The potential developments and the applications of the research on interfacial photochemical react ions are forecasted.
Recent Progress in Studies of Mechanism for DNA Photoreactivation
Song Qinhua,Guo Qingxiang
2001, 13 (06): 428- |
Published: 24 November 2001
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Abstract
Cyclobutane pyrimidine dimers (Pyr< > Pyr) are the major DNA photoproducts induced by the UV radiation. Photo reactivating enzyme (DNA photolyase) repairsDNA by utilizing the energy of visible light to break the cyclobutane ring of the dimer. In this paper, binding and splitting mechanism of pyrimidine dimer by DNA photolyase were reviewed. The structure of DNA photolyases and the UV induced DNA photoproducts were introduced. In particu lar, recent research progress in photo repair mechanism of the photolyase was discussed.
Recent Progress in Comparative Molecular Field Analysis
Hou Tingjun,Xu Xiaojie**
2001, 13 (06): 436- |
Published: 24 November 2001
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Abstract
Comparative molecular field analysis (CoMFA ) may be the most widely used technique in three dimensional quantitative structure activity relation ships. But the conventional CoM FA exists some defects, including the selection of potential function of molecular field, the determination of bioactive conformers, the molecular alignment and the selection of variable of molecular fields, etc. In th is paper, the recent progress in CoMFA , as well as some research work in our lab are introduced. With these improvement s, CoMFA will play more important role in computer aided drug design.
Trend of the Solvent Sublation Technique
Lü Yujuan,Zhu Xihai
2001, 13 (06): 441- |
Published: 24 November 2001
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Abstract
Solvent sublation technique is a more convenient and effective method for the separation, precondition and the removal of organics from the waste water. The apparatus, effect factors, mechanism and applications of the solven t sublation technique are reviewed. In the paper the development trend of sovent sublation is also presented.
Chiral Drug Separation in Binary Cyclodextr in Systems by Capillary Electrophoresis
Gong Shoufeng,He Xinya,Lin Bingcheng**
2001, 13 (06): 450- |
Published: 24 November 2001
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Abstract
Binary cyclodextrin systems are used to analysing combinations of enantio topic solutes and can get very good resolutions for some important chiral drugs. The mechanisms are not always the same as that of single cyclodextrin system. The mechanisms of these systems are reviewed.
Hydrogenation Reactions in Supercritical or Near-Critical Fluid
Li Guoping,Jiang Huanfeng*,Li Jinheng
2001, 13 (06): 455- |
Published: 24 November 2001
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Abstract
Several important homogeneous and heterogeneous reactions in supercritical or nearcritical fluid, especially in supercritical CO2 were reviewed.
The Development in Oxidation of Olefins to Ketones Catalyzed by Palladium Compounds
Li Huaming,Shu Huoming,Ye Xingkai,Wu Yue
2001, 13 (06): 461- |
Published: 24 November 2001
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Abstract
The development in the oxidation of olefins to ketones catalyzed by palladium compounds was reviewed. Some improved methods for the oxidation of olefins catalyzed by Wacker type catalyst systems are also summarized. For this reaction, some new catalyst systems and the reaction mechanism are escribed. Emphasis has been given to the applications of Pd(Ⅱ) HPA (heteropoly acid), Pd (Ⅱ) FePc (iron phthalocyanine) , Pd (Ⅱ) HQ (hydroquinone) FePc, Pd (Ⅱ) HQHPA , Pd (Ⅱ) CuSO4 HPA catalyst systems in the oxidation of olefins to ketones; the application of Pd (Ⅱ) LCoNO2, PdCl2 (MeCN )2 CuCl, Pd (OAc)2 pyridine, fluorous biphasic catalyst systems in the oxidation of olefins toketones is also surveyed.
The Second Generation Catalysis System for Ammonia Synthesis——Ruthenium-based Ammonia Synthesis Catalyst and Its Industrial Application
Zheng Xiaoling,Wei Kemei
2001, 13 (06): 472- |
Published: 24 November 2001
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Abstract
Ruthenium catalysts are considered as the second generation catalysts for ammonia synthesis following iron catalysts. The article summarizes advances in research and industrial application of ruthenium based ammonia synthesis catalysts. Ruthenium catalysts are known to be quite sensitive to the nature of supports, promoters and precursors in ammonia synthesis. The different characterist ics and kinet ics between ruthenium catalyst and iron catalyst are described. Kellogg advanced ammonia p rocess(KAAP) supplies the strong support for industrial application of ruthenium catalysts.
Present Situation and Thinking of Chinese Traditional Compound Medicine Research
He Xiangjiu,Qiu Feng,Yao Xinsheng
2001, 13 (06): 481- |
Published: 24 November 2001
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Abstract
According to the articles and the author’s research, the present situation and thought ways of Chinese traditional compound medicine research are discussed in detail. It can be concluded that the mechanism and the chemical based effects should pay more attentions. Different ways to research the CTCM should be used.