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Progress in Chemistry 2001, No.02 Previous issue Next issue

In this issue:

Review
Progress in Studies of Water Cluster
Wang Linshuang,Wang Rongshu
2001, 13 (02): 81- |
Published: 24 March 2001
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Abstract
Scientists pay more attention to the exploring of micro structures and functions of water clusters, which has become one focus in this field recently. The progress, characteristics and methods of the investigation on water clusters are introduced, and those methods are compared. The way of far2in2frared laser vibration2ro tation2tunneling spectro scopy (FIR2VRT ) is outlined in detail. The characteristics of molecular structure in supercooled water are explained briefly. A perspective in this research field is also discussed.
Progress in Theories and Applications on the Chemistry of Photoacoustic Phase
Wu Ronghu,Su Qingde
2001, 13 (02): 87- |
Published: 24 March 2001
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Abstract
Photoacoustic phase is an important part of the photoacoustic spectro scopy (PAS). It contains valuable information. A study on it may acquire information that can not be obtained from other spectro scopy even from the photoacoustic amplitude. Photoacoustic phase shows the special ability of measuring the optical and thermal properties, studying the nonradiative relaxation processes and analyzing the depth profile of the sample and so on. In this paper, combined with the recent research at our lab and based on the theories of photoacoustic spectro scopy, the application of the theories of the photoacoustic phase to the chemistry is reviewed systematically.
Progress in Research of Supercritical Fluid Technology
Xiao Jianping,Fan Chongzheng
2001, 13 (02): 94- |
Published: 24 March 2001
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Abstract
This paper describes the applications of supercritical fluid technology in extraction, material preparation, chemical reaction and phase transfer catalysis. Representative extraction and reaction equipments are introduced. Furthermore, the opinions on future studies are put forward.
Catalysis of Multi-Nitrogen Chelated Late-Transition-Metal Complexes for Olefin Polymerization
Wang Mei,Qian Mingxing,He Ren
2001, 13 (02): 102- |
Published: 24 March 2001
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Abstract
A2D iim ine nickel, palladium complexes and pyridine bisimine iron, cobalt complexes are discovered in recent years to be new generation late transition metal catalysts for olefin homogeneous poly merization and oligomerization. They have the advantages in catalytic activity, adjustable selectivity, controlla ility of product properties and the stability towards functional groups. The relevant reports are introduced in four parts: the syntheses and structures of the novel catalysts; the effect of ligand structures on the catalytic behavior of complexes; catalysis of the complexes for ethylene and Aolef in polymerization,oligomerization and copoly merization; the mechanism of the catalytic reactions.
Progress in the Metallocene Borane Catalytic System for Olefin Polymerization
Zhang Puyu,Wang Li,Feng Linxian
2001, 13 (02): 108- |
Published: 24 March 2001
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Abstract
The progress in the metallocene borane catalytic system is reviewed in the aspects of catalyst activity, polymerization mechanism , novel metallocene and borane and their catalytic ability to polar and nonpolar monomer polymerization
Progress in Synthesis of Zeolite and Zeolite- like Molecular Sieves
Yuan Zhongyong,Zhou Wuzong,Li Hexuan
2001, 13 (02): 113- |
Published: 24 March 2001
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Abstract
Current research on synthesis of zeolite and zeolitelike molecular sieve materials were reviewed. The research trend on zeolite molecular sieve synthesis was evaluated. Questions worth to pay attentions in synthesis research were pointed out, and research prospect on this field was also given.
Progress in Cobalt-based Catalysts in Fischer-Tropsch Synthesis of Hydrocarbons
Yin Donghong,Li Wenhuai,Yang Wenshu,Zhong Bing,Peng Shaoyi
2001, 13 (02): 118- |
Published: 24 March 2001
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Abstract
The selection of the catalyst is a key factor in Fischer Tropsch synthesis. Cobaltbased catalysts and their catalytic performances in FT synthesis over the last decades have been reviewed. An emphasis is played on the influence of supports, cobalt precursors, promoters, and preparation method on the catalytic activity and selectivity control in the preparation of supported cobalt catalysts.
Investigation on the Catalysts and Reaction Process for the Methanol Synthesis at Lower-Temperature in Liquid Phase
Chu Wei,Wu Yutang,Luo Shizhong,Bao Xinhe,Lin Liu
2001, 13 (02): 128- |
Published: 24 March 2001
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Abstract
The history and development of methanol synthesis at lower temperature in liquid phase(MSLTLP), the research situations,and the present key problems of the technology to be solved are reviewed in this paper. The following topics are especially discussed: the catalyst systems, active sites, reaction pathways and processes, reaction mechanism and catalyst deactivation mechanism , the catalytic recycle and regeneration. Comparing the tradit ional techniques for methanol synthesis, there are a few advantages for the MSLTLP method: the high simple pass conversion (more than 90% ) , the low production cost, the high grade product quality, the mild and temperate reaction conditions. 36 references are cited.
Advances of Endocrine Disrupting Chemicals Research
Ren Jin,Jiang Ke
2001, 13 (02): 135- |
Published: 24 March 2001
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Abstract
It has been suggested that endocrine disrupting chemicals capable of modulating the endocrine system may contribute to adverse health, reproduction, and developmental effects in human and wildlife. This article reviews the evidence, mechanism , testing strategies and several major analysis methods. The screening and testing methods of endocrine disrupting chemicals and the challenge to analysis technology are discussed.
Analytica l Sciences: on the Threshold of the New Century——Retrospect, Prospects and Considerations
Huang Benli
2001, 13 (02): 145- |
Published: 24 March 2001
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Abstract
In this paper, progress in some aspects of analytical sciences have been reviewed, and the trends of their developments have been discussed.
Studies on the Structure-Sensitive Functional Materials
Guo Guocong,Yao Yuangen,Wu Kechen,Wu Ling,Huang Jinshun
2001, 13 (02): 151- |
Published: 24 March 2001
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Abstract
The structure sensitive functional material is specialized in its properties that are remarkably sensitive to the variation of the spatial array of i s constituent atoms. The fundamental studies on structure sensitive functional materials will provide the necessary knowledge of developing novel functional materials by the way of understanding the relation ship between physical properties and the electronic and geometric structures of the compounds, and will result in the specialized functional moieties and them athematic rules which govern the behaviors of these moieties. The paper starts with the example of carbon atoms whose different spatial packing fashions result in notable changes of the bulk proper ies. The sensitivity of various optical, electric and magnetic properties to the geometric structures is further discussed in detail. Finally the theoretical power in this multidisciplinary field is discussed as well.
Hot Research Areas in Organometallic Chemistry
Qian Changtao,Dai Lixin
2001, 13 (02): 156- |
Published: 24 March 2001
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Abstract