Table of Content

24 January 1992, Volume 8 Issue 1

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Articles

Synthesis and Characterization of Zeolite Hexanediamine-Theta-1

Zhao Daqing, Qiu Shilun, Pang Wenqin, Zhang Milin

1992, 8(1):  1-4. 

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The synthesis of zeolite HXDM-Theta-1(HXDM =hexanediamine) from the reaction mixture HXDM-Al₂O₃-SiO₂-HF-H₂O is described. The formation of HXDM-Theta-1 is favoured at 150℃, and a mixture of Theta-1 and ZSM-5 is obtained at a higher temperature. The asynthesized Theta-1 was characterized by means of scanning electron micrography, thermal analysis and ¹³CMASNMRtechniques.

Studies on Solid-Liquid Phase Transfer Equilibrium of Onium Salts(Ⅱ)

Zhao Yingying, Zheng Luo, Shen Yusheng

1992, 8(1):  5-9. 

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The present paper contains the effects of the ammonium ion, counter ion, solvent and anion being transferred on the solid-liquid phase transfer equilibrium constant of quaternary ammonium salts. The most striking difference between solid-liquid and liquid-liquid phase transfer equilibriums is that the length of alkyl chain shows a large effect on the latter but little on the former This means that the chain length affects only the hydrophobicity, rather than the lipophilicity.

Kinetics of Reaction of Bromo-epoxy Resin with Oleic Acid catalyzed by Dimethyl benzyl amine

Gao Jungang, Yang Yan, Jing Jing

1992, 8(1):  10-14. 

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The kinetics of reaction of bromo-epoxy resin with oleic acid in the presence of dimethylbenzylamine catalyst was studied. The reaction is a zero order reaction with respect to oleic acid, first order with respect to epoxy group and 0. 74 order with respect to dimethylbenzylamine. The reaction rate constants at various temperatures and activation energy were determined. The mechanism of this reaction was discussed.

Syntheses and Crystal Structures of Benzyl-and Cyclopentyl-Cyclopentadienyl Sodium Tetrahydrofuranate Complexes

Zhang Bin, Jin Zhongsheng, Wang Yuling, Wei Gecheng, Chen Wenqi

1992, 8(1):  15-20. 

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The present paper covers syntheses and crystal structures of benzyl- and cy-clopentyl-cyclopentadienyl sodium tetrahydrofuranate complexes C₆H₅CH₂C₅H₄Na·THF (1) and C₅H₉C₅H₄Na°THF (2). X-ray diffraction data of the title compounds were collected at a low temperature (about 210K). Structures of both the crystals belong to monoclinic space group P2₁/n with α=0. 9316(3) nm, b=1. 5161(4) nm, c=0.9791(3) nm, β=91. 06(3)°Z=4 for (1) and α=1. 6120(7) nm, b=0. 9370(3) nm, c=1. 8475(7) nm, β=109.52(3)°Z =8 for (2). Both structures were solved by using direct methods and refined by block-matrix least-squares to final values of R =0. 044 for 520 observed reflections (1) and R =0. 067 for 921 observed reflections (2). In the crystals the tetrahydrofuranate complexes C₆H₅CH₂C₅H₄Na·THF and C₅H₉C₅H₄Na·THF adopt a puckered chain structure with η⁵-(C₆H₅CH₂)C₅H₄ and η⁵-(C₅H₉)C₅H₄ rings connected by a bridge Na (THF) unit.

Studies on Polymeric Crown Ethers (Ⅰ)——The Syntheses and Complexation Properties of Polymeric Thiacrown Ethers with Polyether Backbone

Dong Shihua, Hu Yunhua

1992, 8(1):  21-26. 

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Four new polymeric oxa-thiacrown ethers were prepared by the intramolecular cy-clization of poly (2-chloroethylglycidyl ether) with dimercaptans, which is the most convenient method for synthesizing poly(thiacrownether)s. The poly(thiacrownether)s exhibited excellent complexation properties for noble metal ions such as Au (Ⅲ), Pd (Ⅱ) and Ag(Ⅰ), except Pt(Ⅳ). In addition, the XPS of polymeric thiacrown ether (PC3) and its complexes of Au(Ⅲ) and Pd(Ⅱ) were determined.

Studies on Hadamard Transform Fluorimetry

Chen Guanquan, Yang Xiaohong, Li Jianjun, Hu Jiming

1992, 8(1):  27-28. 

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Hadamard transform spectroscopy has been investigated since the later 1960's and early 1970's. It was demonstrated that the application of Hadamard transform technique to spectroscopy can facilitate multichannel detection of weak signal. It can be appplied not only to component analysis, but to image analysis. Now, it has been widely used in infrared spectrometry, Raman spectrometry and photothermal deflection analysis. But its application to molecular fluorimetry has not been reported up to now.

A Study on Determination of Some Trace Nonmetals by Microwave Induced Plasma Atomic Emission Spectrometry

Zhang Jinsheng, Ye Dongmei, Zhang Hanqi, Jin Qinhan

1992, 8(1):  29-30. 

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In general, atomic emission spectrometry (AES) is an excellent technique for determination of metal elements. However, its capability of determining nonmetals has not been developed well. The major reasons are the resonance lines of most nonmetals lie in the vacuum ultraviolet spectral region and the ionic lines of these elements are difficult to be used because the ionization potentials of the elements are very high. And furthermore only He plasma can efficiently excit those ionic resonance lines. The practical application of HeICP-AESto determining the nonmetals is also difficult because its operating and perchace costs are very high. In contrast to HeICPAES, the costs of He microwave induced plasma (MIP)-AESare relatively low, HeMIPhas a high excitation capability which can excite ionic lines of various nonmetals and the nonmetals can be determined by HeMIP-AESwith a high sensitivity.

Evaluation of Microwave Plasma Torch (MPT) as an Excitation Source for Determination of Mercury

Duan Yixiang, Du Xiaoguang, Jin Qinhan

1992, 8(1):  31-32. 

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The microwave plasma atomic spectrometry is an important branch of the plasma atomic spectrometry. Since the first use of microwave induced plasma（MIP） as an excitation source for spectral Chemical analysis by Broida and Chapmanin in 1958, especially the introduction of TM₀₁₀ cavity by Beenakker in 1976 and of surfatron by Moisan in 1979 with which an atmospheric pressure helium MIPcould be obtained, MIPhas received considerable attention as a new excitation source for spectrometric analysis.

Spectroelectrochemical Investigation on Neutral Red

Shen Baoen, Zhang Ming, Tang Yinxuan, Li Benle

1992, 8(1):  33-36. 

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Neutral Red can be used as an indicator, a stain reagent or a mediator compound in the studies of biological redox systems. No reports dealing with the electrode process of Neutral Red, especially, about its kinetics have been published. In this paper we report the determinations of formal reduction potentials, the number of electrons transferred, diffusion coefficient as well as the rate constant of heterogeneous electron transfer

Corn Umbilicus Tissue-Based Membrane Biosensor for Pyruvate

Fang Yao, Cai Ronghui, Zhang Yonghua, Deng Jiaqi

1992, 8(1):  37-40. 

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Pyruvate, a final metabolite of glycogen, is widely distributed over many kinds of tissue fluids of human bodys. The determination for its contents is of clinical importance in gynaecology. Titrimetry, colorimetry and chromatography are common used methods. In recent years, enzymatic mthod has proved to be one of the most important determination techniques for its simplicity and fastness. However, in some cases, the use of purified enzymes as biocatalysts yields systems with a short useful lifetime owing.

Studies on the Fluorescence Enhancement Effect of Eu-La-DBM-DPG-Acetone System

Zhu Guiyun, Si Zhikun, Jiang Wei, Li Wei

1992, 8(1):  41-44. 

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The study of fluorescence enhancement has attracted attention recently. For example, the sensitivity and selectivity of Eu-thenoyltrifluoroacetone (TTA)phenan-throline and Eu-diphacinone-ammonia systems in Triton X-100 micelles are increased by the addition of La³⁺ Gd³⁺, Tb³⁺, Lu³⁺ or Y³⁺.

A Facile Synthesis of 4-Alkyl-2-Quinolones

Huang Xian, Ye Fangchen

1992, 8(1):  45-47. 

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The derivatives of 4-alkyl-2-quinolones possess a variety of biological activities. The general synthetic method of 4-alkyl-2-quinolones is the reaction of aryl amines with β-ketoesters to form β-ketoamides, which are then heated in concentrated sulfuric acid to complete the ring closure. Although a number of its 4-methyl and aryl derivatives have been obtained, other 4-alkyl-2-quinolones are rarely mentioned for lack of a convenient method to prepare the appropriate β-ketoesters used in condensation.

Bibracchial Lariat Ethers(Ⅰ)——The Synthesis and Crystal Structure of the N,N'-bis(2-Methoxy-1-Naphthylmethyl)-4,13-Diaza-18-Crown-6 Sodium Iodide Complex

Ge Yuhua, Wang Defen, Hu Hongweng, Zhou Zhongyuan, Yu Kaibei

1992, 8(1):  48-52. 

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Diaza Crown ethers are versatile complexing reagents, their complexing abilities are dramatically modified by the electron donating atoms on substituents attached to the nitrogen if they can give a three-dimensional cavity as in cryptates. Hence the synthesis and characterization of bibracchial lariat ethers (BIBLES) have received much attention. In the preparation of new BIBLES, a complex Ⅱ was unexpectedly obtained.

Dehydrochlorination of Poly vinyl chloride Catalyzed by Quarternary Ammonium Salts in Solid Phase

Fu Yujie, Xie Demin, Wang Rongshun, Wang Cunguo, Zhang Xiyan, Wang Qiang

1992, 8(1):  53-58. 

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The development of conducting polymers has been an active subject in the world since the late in 1970's. The preparation of polyaeetylene-like polymers by dehydroehlorination of polyvinylchloride (PVC) is a very economical and useful procedure and,hence, a focus of enormous interest of both theoretieians and experimentalists. In recent years, many methods for dehydrochlorination of PVCin solution have been studied widely and many kinds of catalytic mechanisms have been suggested.

An IR Study of the Dispersion Stability of Catalyst Powders Dispersed in Solutions of Linear Saturated Polyesters

Lu Baotian, Gunter R. Joppien, Harald Urban

1992, 8(1):  59-63. 

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The conformation of polymers at the solid-liquid interface has been the subject of considerable interest in the fundamental theory and applied practice. In paints and printing inks, dispersions of pigment or filler powders in polymeric binder solutions have to be maintained in the colloidal state. One of the stabilizing mechanisms for paint is the steric stabilization. On the other hand, in the formation reaction of polymer at the solid-liquid interface took place between monomer solutions and solid