Table of Content

24 April 1991, Volume 7 Issue 2

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Articles

The Influence of Heteroatom M(M = B, Al, Ge, Ga, Fe)on the Adsorption Properties of M-ZSM-12 Zeolites

Yu Long, Wang Weili, Pang Wenqin

1991, 7(2):  67-73. 

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Heteroatom M-ZSM-12 zeolites(M=B, Al, Ge, Ga, Fe) are hydrothermally synthesized and it is proved that the heteroatom M is involved in the framework of synthesized molecular sieves by means of XRD, IR spectra. The results of adsorption and diffusion experiments indicate that the heteroatom M modifies the pore volume, specific surface area, and the channel of ZSM-12 molecular sieves.

Mechanism and Dynamics of the Addition of Lithium Hydride to Acetylene

Chen Bin, Zhao Chengda, Huang Jingan

1991, 7(2):  74-78. 

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Reaction ergodography for the addition of lithium hydride to acetylene indicates that the lithium hydride, in both monomeric and dimeric forms, reacts with the acetylene via two similar and competitive pathways. Hence, we have obtained the pseudo-first-order rate constant of this reaction.

Simultaneous Determination of Samarium and Gadolinium by a Automated Stopped-flow Analyzer

Yang Yi, Cai Ruxiu, Zeng Yun'e

1991, 7(2):  79-83. 

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The present paper contains the reaction mechanism of the rare earth complex with 2-(2-arsenophenylazo)-7-(2, 6-dichloro-4-fluoro-phenylazo)- 1, 8-dihydroxynaphthalene-3, 6-disulfonic acid (DCF-arsenazo) studied preliminarily with a fully automated stopped-flow analyzer. A method with a high sensitivity and selectivity is proposed for the simultaneous determination of samarium and gadolinium based on the differential kinetic reaction of the rare earth complex with DCF-arsenazo. Sm and Gd in their concentrated oxides were determined with the relative errors less than 6%.

Study on the Atomization Mechanism of Hydrides in Graphite Furnace Atomizers

Wang Zongxiao, Wang Ying, Lin Xianjie

1991, 7(2):  84-90. 

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The influence of the surface state of the graphite furnace atomizer on the atomization of hydrides has been studied by means of surface film coating and quantum chemistry CN-DO/2 calculations. The results of the study prove that the atomization of AsH₃, SbH₃ and BiH₃ in the graphite furnace atomizer is not a simple gas phase pyrolytic process, but a surface catalysis pyrolytic process.

Studies on Dual-beam Spectrometric Simultaneous Determination of Platinum and Rhodium with Water-Insoluble Porphine T(3-M-4HP)P

Li Youfen, Zheng Yanzhi

1991, 7(2):  91-95. 

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The optimal conditions for the complexation reaction of meso- tetra(3-methoxy-4-hy-droxyphenyl) porphine T(3-M-4HP)P with platinum and rhodium are presented. Beer's Law is obeyed when the concentration of rhodium is in the range of 0. 45～1.15 μg/25mL. The molar absorptivity of rhodium was found to be 1.99×10⁶ L·mol^-1·cm^-1 at 460 nm. The value of ε_Pt was found to be 6. 28×10⁵ L·mol^-1·cm^-1 by linear regression method. The K coefficient method and compensating coefficient were used to determine platinum and rhodium simultaneouly without removal or masking of the interferents in the sample. The results for the determination of platinum and rhodium in the mixed solution of platinum and rhodium are satisfactory.

Synthesis of 2-Ferrocenyl-2-(Dialkyl Hydroxymethyl)D-1,3-Dithianes

Shi Shujian, Sun Lijun

1991, 7(2):  96-99. 

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The reactions of lithiated 2-ferrocenyl-1,3-dithiane with alkyl carbonyl compounds are studied. Fifteen of title compounds which are new ferrocene derivatives were synthesized and structurally characterized by elemental analysis, IR and ¹H NMR spectra. The ¹H NMR spectra of the dithiane compounds are briefly discussed.

Phyllofenone A, a New Scalarane Sesterterpene from the Sponge Phyllospongia Foliascens(Pallas)

Zeng Longmei, Fu Xiong, Su Jingyu, Chen Shaoxing, John K. Snyder

1991, 7(2):  100-106. 

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The present paper covers the structure of a new sesterterpene, phyllofenone A(1) , isolated from the South China Sea sponge Phyllospongia foliascens. Phyllofenone A is a member of the scalarane class of sesterterpenes with a (C-20, C-24)-bishomo-(C-25)-nortetra-cyclic skeleton. The structure charcterization was based on one- and two-dimensional NMR and mass spectroscopy with the assistance of molecular modeling. Phyllofenone A shows weak antifungal activity against Candida pseudotropicalis.

Deformation Potential Approach to the Calculation of Mobilities of Carriers and Conductivity of trans-Polymonocyanoacetylene

Huang Yuanhe, Liu Ruozhuang

1991, 7(2):  107-113. 

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The deformation potential theory for one-dimensional organic polymer is studied. This approximation is then used to calculate the mobilities of carriers and the conductivity of trans-polymonocyanoacetylene (PMCA). The results of calculations are in fairly good agreement with experimental data.

Crystal and Molecular Structure of Mo₂[(μ₂-S)SCNEt₂]₂(S₂CNEt₂)₂

Sun Chunting, Huang Qijun, Li Shuqin, Wang Tiegang, Zhang Guangren, Qu Xiangbang, Tang Zhongkun, He Guoqiang, Shen Yankui, Jin Zhongsheng, Wei Gecheng

1991, 7(2):  114-116. 

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Crystal structure of the title complex was determined by X-ray diffraction method. It crystallizes in space group P2₁/n with cell dimensions:α=10. 041(5) , b=10. 719(4) , c= 1. 5671(6) nm, β=104. 36(3)°. The structure was solved by Patterson method. The final residual factor is R=0. 050.

Facile Preparation and Application of Polystyrylsulfonyl Chloride Resins

Huang Wenqiang, Li Chenxi, Bao Rong, Lu Yu, Pan Tongtong, Men Aiju, Yin Yaorong, He Binglin

1991, 7(2):  117-118. 

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Highly Sensitive Spectrophotometric Determination of Trace Amounts of Uranium ( Ⅵ ) with Thiocyanate-Basic Xanthene Dye-Gum Arabic Systems

Liu Zhongfang, Liu Shaopu

1991, 7(2):  119-123. 

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Structure Investigation of a New Alkaloid from Zanthoxylum Schinifolium Sieb et Zucc

Wang Dong, Gao Congyuan, Liu Suolan, Wei Luxue

1991, 7(2):  124-128. 

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Studies on Condensed Heterocyclic Compounds(Ⅲ)——Synthesis and Antibacterial Activity of 3-(4-Pyridyl)-6-Alkyl/Aromatic Heterocyclyl-s-Triazolo[3,4-b]-1, 3,4-Thiadiazoles and 1,4-Bis [6-(4-Pyridyl)-s-Triazolo [3,4-b]°-1, 3,4-Thiadiazol-3-yl]-n-Bu

Zhang Ziyi, Chen Xin, Wei Lulin, Ma Zhaoli

1991, 7(2):  129-133. 

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