Table of Content

24 February 1983, Volume 4 Issue 1

Previous Issue    Next Issue

Articles

THE MECHANISM OF FORMATION AND CRYSTAL GROWTH OF MOLECULAR SIEVE ZEOLITE (Ⅴ) -THE KINETICS OF CRYSTAL GROWTH OF L-TYPE ZEOLITE

Xu Ruren(Hsu Rhu-Reng), Li Shougui

1983, 4(1):  1-6. 

Asbtract ( )   PDF (550KB) ( )  

Related Articles | Metrics

We were able to achieve a strict separation of processes of nucleation and growth for the crystallization of L-type zeolite over a considered range by adding crystal seeds of L-type zeolite in initial gel. The kineticsof crystal growth of L-type zeolite obeys a kinetic law of order 2/3. Notonly were reported influences of various parameters on the crystal growth rate, but also the apparent activation energy of growth of L-type zeolite was obtained. Based on the experimental results, a model for the explanation of crystal growth of L-type zeolite is developed.

STUDIES OF THE PREPARATION AND STABILITY OF TRIVALENT URANIUM IN AQUEOUS SOLUTION

Zhou Zuming, Yang Yongle, Mao Jiajun, Bian Maiying, Qin Qizong

1983, 4(1):  7-12. 

Asbtract ( )   PDF (448KB) ( )  

Related Articles | Metrics

Methods for reduction of hexavalent uranium to the trivalent state by the liquid-zinc-amalgan and mercury cathode electrolysis have been investigated in hydrochloric and sulfuric acid solutions. The percentages of reduction were determined with different media, various acid concentrations, uranium concentrations and the time of electrolysis. It was found that the hexavalent uranium was quantitatively reduced to trivalent state by mercury cathode electrolysis. The stability of uranium (Ⅲ) in various hydrochloric acid solution was measured in the air and nitrogen, and the kinetics of oxidation of uranium (Ⅲ) proceeded reasonably to be a first order reaction in the air. The absorption spectra of uranium (Ⅲ) in hydrochloric acid solution were examined.

STUDY ON SYNTHESIS ANp CHARACTERIZATION OF THE COMPLEX OF Eu (Ⅱ) PERCHLQRATE AND DIBENZO-18-CROWN-6

Wang Genglin, Yan Shiping, Li Xueyao

1983, 4(1):  13-18. 

Asbtract ( )   PDF (411KB) ( )  

Related Articles | Metrics

The complex of Eu(ClO₄)₂ and dibenzo-18-crown-6 ( L ) has been prepared in solid state and characterized by elemental analysis, X-ray diffraction, TG-DTA, IR and photoacoustic spectra, as well as fluorescence emission spectra.The complex is proved to be Eu(ClO₄)₂·L. This complex changes from colourless to a pale blue when irradiated with sunlight, but restores gradually to its original state in the dark.

STUDY OF PRESSURED CATIONIC ION EXCHANGE ELUTION SEPARATION -SEPARATION OF UO₂²⁺,U(F), AND Fe²⁺ ORUO₂²⁺ AND Fe³⁺ AND MECHANISM OF SEPARATION OF UO₂²⁺ AND U(Ⅳ)

Jia Dongfang, Xiang Hongwen

1983, 4(1):  19-25. 

Asbtract ( )   PDF (530KB) ( )  

Related Articles | Metrics

This paper has found an elution agent, Mn²⁺-containing sulfuric acid, which has the ability of enhancing the column efficiency of the cationic chromatographic separation of UO₂²⁺ and U(Ⅳ) and of improving the symmetry of their chromatography.In further study, we found out the diffusion process of UO₂²⁺ and U(Ⅳ) in resin can be accelerated with Mn²⁺-containing sulfuric acid agent about 20 and 400 folds respectively.The activation energy of diffusion of UO₂²⁺ and U(Ⅳ) has also beenidetermined in the range of temperature 25-45℃by using the Mn²⁺-containing sulfuric acid as desorption agent. Under the corresponding temperatures, the plate heights h of UO₂²⁺ and U(Ⅳ) are obtained from elution curves respectively, comparing the ratios of Bvalues of different temperatures with the ratios of h' values under corresponding temperatures, we have clearified that the column efficiency under present elution condition is determined by the particle diffusion process and that the effect cf Mn²⁺ ion was attributed to the great enhancement of the particle diffusion process of UO₂²⁺ and U(Ⅳ).For further improving column efficiency, macroreticular ion exchange resin of fine particles Was used. The wriggle pump was used as driving source to overcome the difficulty of corrosion of inorganic acids in a pressured chromatographic separation equipment. After studying the experimental factors, such as stationary phase, operation temperature and elution agent, the optimum coditions for separating UO₂²⁺, U(Ⅳ) and Fe²⁺ or UO₂²⁺ and Fe³⁺ have been established.

INVESTIGATIONS ON OSCILLOPOLAROGRAPHIC TITRATIONS(ⅩⅢ)-DIRECT TITRATION OF THE SALTS OF VERY WEAK ORGANIC BASES (ACIDS) IN AQUEOUS SOLUTIONS

Chen Shuping, Kao Hung

1983, 4(1):  26-30. 

Asbtract ( )   PDF (336KB) ( )  

Related Articles | Metrics

Salts of very weak organic bases and salts of very weak organic acids can not be titrated in aqueous solutions by classical neutralization titration methods, on account of the very weak acidity or basicity of its solution. Non-aqueous titrations as well as potentiometric titrations are used instead for analysis of drugs of this kind. Simple, rapid and accurate oscillopola-rographic titrametric methods are given for titration of these salts in aqueous solutions.

APPLICATION OF REGRESSION ANALYSIS IN RARE EARTH ANALYSIS

Lin Zhixin, Cai Ruxiu, Fang Xianan, Zeng Yune

1983, 4(1):  31-35. 

Asbtract ( )   PDF (327KB) ( )  

Related Articles | Metrics

In the present paper, it has researched the effect of co-color action on the sperctrophotometric analysis of the rare earth. It has been discovered that when lighter and heavier rare earth are coexisted the absorbance of complex of the heavier rare earth with chlorophosphonazo-Ⅲ obviously increases under a certain experimental condition and that the absorbances appear a regular change with increasing of content of the lighter rare earth. We have probed into using the method of regression analysis on the microcomputer of TRS-80 type for treating experimental results. Namely, these two regression equations are built up for λ_max of a and β peak, respectively. Therefore, after these two absorbance values were measured on these two λ_max for single sample and inputting into microcomputer it is able in a measured result to predict the content of the lighter and heavier rare earth and to cancel partial effect of the co-color action. The self-edited computer program with BASIChas passed through active state examination. With microcomputer to carry out regression treatment the result has shown that the use of chlorophosphonazo-β for determining Yin the presence of La may decrease measured error from +26±15% to +3.6 ±3.0%. Above method is simple, fast and convenient. In principle, the accuracy consists with requirement of spectrophotometric analysis.

DETERMINATION OF TRACE SELENIUM BY CA- THODIC STRIPPING CATALYTIC POLAROGRAPHY

Xu Hongding, Zhang Kanqi, Tang Silin

1983, 4(1):  36-42. 

Asbtract ( )   PDF (475KB) ( )  

Related Articles | Metrics

The common electrochemical techniques for determination of trace selenium (Ⅳ) are the stripping voltametry and the one making use of polaro-graphic catalytic wave. We combined this two techniques and established a novel method, cathodic stripping catalytic polarography, for the determination of trace selenium. The various experimental conditions and their influence on the results were studied. The method was applied to the ana-lyisis of some practical samples. By using of a Model 883 polarograph with a rotation glass carbon electrode, after enrichment by electrolysis for 3-5 minutes a concentration in the range of 4×10^-9-1×10^-7M selenium could be determined or after enrichment for 20-30 minutes a detection limit of 7×10^-10M selenium was reached. The oxygen in the system was unnecessary to be removed. The electrode process during the stripping catalysis of selenium was also studied with the combination of glass carbon electrode and a bulk mercury. The reaction mechanism involved in this process was discussed.

DI(2-ETHYLHEXYL) SULFOXIDE (DEHSO) AS A STATIONARY PHASE IN REVERSED PAPER CHROMATOGRAPHY FOR THE SEPARATION OF Ru-Os,Rh-Ir,Pd-Pt AND SOME OTHER COUPLES AND THEIR R_f GRAPHS

Cao Zhengbai, Lu Zhonge

1983, 4(1):  43-47. 

Asbtract ( )   PDF (328KB) ( )  

Related Articles | Metrics

Di(2-ethylhexyl) sulfoxide (DEHSO), an extractant easily dissolved in liquid paraffin, was synthesized in this paper.Di(2-ethylhexyl) sulfoxide (DEHSO) dissolved in dodecylbenzene was used as stationary phase and the RR_f graphs of more than 40 metallic ions tested in DEHSO-HCl system and in DEHSO-HNO₃ system by reversed paper chromatography were reported.DEHSOhas been successfully used by reversed paper chromatogra phy to separate a lot of metallic ions in mixtures, such as Ru-Os, Rh-Ir,Pd-Pt and some other metal couples.

SPECTROPHOTOMETRIG STUDY ON THE COMPLEX FORMATION BETWEEN LANTHANUM AND CHLOROPHOSPHONAZO-m-NO₂ (CPAmN)

Xu Zhongjun(Hsu Chung-gin), Pan Jiaomai, Hu Zhaosheng(Hu Chao-sheng), Jia Xiping

1983, 4(1):  48-54. 

Asbtract ( )   PDF (494KB) ( )  

Related Articles | Metrics

Protonation of chlorophosphonazo-m-NO₂ takes place in acidic medium (Ig K_p = -2.11) while dissociation of the first hydroxyl group from naphthalene ring is shifted toward the basic region (pK_α= 10.21) .Various complexes of La-CPAmN are formed in the pHrange of 1.5-2.0. The mole ratios La/CPAmN of these complexes have been estimated to be 1:1, 1:2 and 1:3 by Job's continuous variation method and the equilibrium shift method. The β-type complex (1:1) giving a characteristic maximum absorption at 715 nm is formed under a certain experimental condition.The 1:3 complex existed in the excess of reagent is very stable in acidic medium with an overall stability constant lg K_s, of 45.40.

¹³C NMR STUDY OF SEVERAL FLUORENE DERIVATIVES (ORGANIC MATERIAL SENSITIZER)

Chen Liang, Hu Yuxian

1983, 4(1):  55-59. 

Asbtract ( )   PDF (343KB) ( )  

Related Articles | Metrics

In this treatise the ¹³C NMRresearches of 2,4,7-trinitrofluorenone, 9-dicyanomethylene-2,4,7-trinitrofluorene, 2,4,5,7-tetranitrofluorenone and 9-dicyanomethylene-2,4,5,7-tetranitrofluorene have been made.The ¹³C-¹H coupled,the proton off-resonance decoupled and the decoupled NMRspectra for four fluorene derivatives are obtained at the FX-60 Q PFT-NMRspectrometer (the magnetic field intensity being 14093 G, the observation frequency being 15.4 MHz). With the aid of the techniques of proton off-resonance decoupling, broad band decoupling, and the substituent chemistry shift additivity rules and by the model compound comparison,the chemical shifts and coupling constants of all peaks observed have been determined.The experimental results show, according to chemical shift and coupling constants, that the belonging of different peaks can be recognized and bonded states of unknown compound and substituent electronegativity value can be judged. Therefore, a useful clue may be provided for distinguishing various structures of compounds.

STUDIES ON ADSORPTION OF ISOBUTYLIC ACID ON Fe-Pb-PHOSPHATE CATALYSIS

Zhen Kaiji, Bi Yingli

1983, 4(1):  60-64. 

Asbtract ( )   PDF (355KB) ( )  

Related Articles | Metrics

In this paper, the reversible and irreversible adsorption of isobutylic acid on Fe-Pb-phosphate catalysts were studied by using pulse chromato-graphic technique. The affect of preadsorbed H₂O on irreversible adsorption was also observed. Some information on further consideration of mechanism of adsorption and oxidative dehydrogenation of isobutylic acid on the catalysts was provided.

TEMPERATURE PROGRAMMED THERMAL ANALYSIS INVESTIGATION OF AMMONIA DESORPTION FROM ZEOLITE HZSM-5

Zhang Zhenqiu, Zeng Zhaohuai, Li Yuguang

1983, 4(1):  65-69. 

Asbtract ( )   PDF (346KB) ( )  

Related Articles | Metrics

Agroup of ammonia desorption curves from the HZSM-5 zeolite have been obtained by thermal analysis at different temperature-programmed rates. Through mathematical treatment, it has been found that there are two kinds of active sites for ammonia adsorption,whose energy distributions are Er(θ_Ⅰ) = [53.0 + 39.7 (I-θ_Ⅰ)]KJ.mol^-1, and E_Ⅱ(θ_Ⅱ) = [128+ 8.0(1 -θ_Ⅱ)]KJ.mol^-1 respectively.

ENRICHMENT OF LITHIUM ISOTOPES BY HIGH PRESSURE ION EXCHANGE DISPLACEMENT CHROMATOGRAPHY(Ⅰ) -APPLICATION OF THE EQUILIBRIUM THEORY OF THE DISTILLATION TYPE MODEL

Ling Daren, Huang Zuzhan

1983, 4(1):  70-74. 

Asbtract ( )   PDF (328KB) ( )  

Related Articles | Metrics

Based on the equilibrium plate model of the distillation type a set of the theoretical equations have been drawn for the isotope steady band with very small enrichment factor and the band being of a limited length. That is, we used the parameters , the enrichment factor of a couple of isotopes (ε), the molar fraction of the species to be enriched in the feed (x₀) and the adsorption band length expressed by the number of HETP (P) to determine the shape of the isotope steady band, the positions of the tails of the steady band and concentrations of the species to be enriched at the corresponding tails, the total enrichment of the species to be enriched in the isotope steady band,the variation of the total enrichment in the unsteady band due to the increase of the displacement distance and so forth. And some special situations were discussed.These main theoretical expressions are given by the Eqs. (2)-(10) in the paper, where Pis the position of some point from x=x₀ in the steady band; p', the position of the front of the steady band from x=x₀; x, the molar fraction of the species to be enriched at p; x_e, the molar fraction of the species to be enriched at P-p'; x_d, the molar fraction of the species to be enriched at p', E_e^l, the total enrichment of the species to be enriched in the enriched part of the steady band;E_d^l, the total depletion of the species to be enriched in the dopleted part of the steady band; E_e, the total enrichment of the species to be enriched in the enriched part of the unsteady band after displacing the distance of t numbers of HETP; t, displacing distance and a, an experimentally determined constant.The expressions in this paper bear some analogy to Conrard's in form, but Pis twice that of Conrard's because of the difference between the chromatographic motion models used.

A STUDY ON THE TRANSFORMATION AND STABILITY OF ADSORPTION STATES OF CARBON MONOXIDE ON ALUMINA SUPPORTED RUTHENIUM

Xin Qin, Zhang Hui, Ying Pinliang, Guo Xiexian, Chen Yaoqiang, Chen Yu

1983, 4(1):  75-80. 

Asbtract ( )   PDF (426KB) ( )  

Related Articles | Metrics

Adsorption of carbon monoxide and the co-adsorption of hydrogen and carbon monoxide on alumina supported 4% ruthenium have been studied by the differential infrared spectroscopy. The bands of COadsorbed on ruthenium have been assigned. The band of medium frequency at 2070-2060cm^-1 is assigned to the overlap bands of symmetric stretching vibration of twin COand stretching vibration of linearly adsorbed CO. The influences of surface C (C_s), surface H (H_s) and surface O (O_s) on adsorption states of carbon monoxide are discussed. It is shown that the surface carbon formed by the disproportionation of CO enhances strengthening of Ru-CO bonding, however, the co-adsorption of hydrogen weakens strengthening of Ru-CO bonding. Surface oxygen impels to form the site deficient electron. Twin CO could be formed in the sites. Adsorption of twin CO is active adsorption.

RAMAN SPECTRA OF RARE EARTH ACETYLACETONATE COMPLEXES (Ⅱ)

Liu Guofa, Wang Yutian, Zhao Yongnian, Liang Yingqiu

1983, 4(1):  81-86. 

Asbtract ( )   PDF (606KB) ( )  

Related Articles | Metrics

Laser Raman spectra of the rare earth acetylacetonate anhydrous, mono and trihydrated complexes indicated that hydrated molecules have effects on the M-O stretching vibration bands of these complexes. It was found that anhydrous complexes have only one band near 400cm^-1, mono-hydrated complexes have two bands of the different intensities near 400 and 415cm^-1, and that the M-O stretching vibration frequencies of them change periodically with atomic number, showing the "tetrad effect". However, the band near 400cm^-1 of trihydrated complexes undergoes deformation and different changes with the light and heavy rare earth ion, therefore, the "tetrad effect" characteristic of lanthanide was disturbed and destroied. When monohydrated complexes loses coordination water molecule, the band near 415cm^-1 disappears, and if dehydrated complex absorbs water molecule in air, this band again appears. Assignment of the band near 415cm^-1 in the last paper was modified on the basis of the above-mentioned invertible experimental fact, it is due to ( M-O ) H₂.

Preface

STUDIES ON CHIRAL THIOPHOSPHORIC ACIDS AND THEIR DERIVATIVES (Ⅱ) -ABSOLUTE CONFIGURATIONS OF THE OPTICAL ACTIVE O-ETHYL O-PHENYL PHOSPHOROTHIOIC ACID AND ITS THIOL-ESTERS

Tang Chuchi, Wu Guiping

1983, 4(1):  87-92. 

Asbtract ( )   PDF (431KB) ( )  

Related Articles | Metrics

The absolute configurations of O-ethyl O-phenyl phosphorothioic acid ( 1) and its thiol-esters (2) were established by the following reactions (Scheme l.):the chlorination of (-)-(2)and esterification of (-)-O-ethyl O-phenyl phosphorochloride; (3) It has been confirmed that the chlorination of (-)-(2) either with Cl₂ or SO₂ Cl₂ proceeds with retention of the configuration, and the esterification of(-)-(3) forms (-)-O-ethyl O-methyl O-phenyl phosphate; (4) proceeding with complete inversion of its configuration..a.R′=CH₃ b.R′=n-pr c.R′=C₂H₂OET Since the absolute configurations of (-)-(4) are kno wn as: (S)-(-)-(4), (R)-( + )-(4), the absolute configurations of ( + )-(1) and (-)-(2 ) should be (R)-( + )-(l) and (R)-(-)-(2),respectively. This result consists with that one obtained by X-ray diffraction method.

Articles

STUDIES ON BORON COMPOUNDS (Ⅳ) -SYNTHESES AND PROPERTIES OF BORANE ANION AMMONIUM SALTS

Zhao Dejie, Shan Zixing, Song Jianyang, Zhang Guomin

1983, 4(1):  93-99. 

Asbtract ( )   PDF (608KB) ( )  

Related Articles | Metrics

15 new borane anion ammonium salts have been synthesized by the reaction of borane anion (arachno-B₃H₈^- or closo-B₁₀H₁₀^2-) with various ammonium halides. All of the compounds were confirmed by elemental analysis and IR. The DTAresults for these compounds indicated that the thermal stabilities of the B₁₀H₁₀^2- salts are higher than those of B₃H₈^-, and the thermal stabilities of these compounds become lower when an alkyl group in the ammonium cation is substituted by an amino group. The greater the number of amino groups, the more the thermal stability decreases,

MONOCYANOETHYL-β-DIKETONES AND THEIR ISOMERIZATION

Huang Huamin, Li Bao, Zhan Yongfu

1983, 4(1):  100-104. 

Asbtract ( )   PDF (320KB) ( )  

Related Articles | Metrics

β-Diketones (acetylacetone, propionylacetone and benzoylacetone) were treated with acrylonitrile in the presence of aqueous potassium hydroxide giving monocyanoethylated β-diketones (Ⅰ)-(Ⅲ), which by heating with HCl were isomerized to the corresponding3,4-dihydro-2-(lH) pyrid-ones(Ⅳ)-(Ⅵ). (Ⅰ)-(Ⅲ) and (Ⅳ)-(Ⅵ) were hydrolyzed to the ketoacids (Ⅶ)-(Ⅸ). 2,4-Dinitrophenylhydrazones(Ⅹ)-(Ⅻ) were prepared from(Ⅳ) -(Ⅵ). Compounds (Ⅱ), (Ⅲ), (Ⅴ), (Ⅵ)and(Ⅷ)-(Ⅶ) were reported for the first time.

ANALYSIS ON THE GPC CHROMATOGRAMS OF COPOLYMERS

Yang Meilin, Shen Jiacong, Sun Dingyi

1983, 4(1):  105-111. 

Asbtract ( )   PDF (596KB) ( )  

Related Articles | Metrics

A new concept, the hydrodynamic volume of segment, and a method of analysing the GPC chromatograms of copolymers have been proposed, with which the whole of the structural parameters of copolymers can be obtained. Some results of the experiments and of reported data are discussed in this paper.

Preface

STUDIES ON THE PREPARATION OF FeTi FROM ILMENITE AND ITS HYDROGEN ABSORPTION PROPERTIES

Shen Panwen, Wang Genshi, Song Deying, Yin Wenjuan, Shi Shumin, Yu Suqing

1983, 4(1):  112-114. 

Asbtract ( )   PDF (223KB) ( )  

Related Articles | Metrics

In this paper the preparation of FeTi from ilmenite by hydrolytic coprecipitation-reduction method is presented. The method may be expressed as follows: Fe₂O₃·2TiO₂.The structure of FeTi thus made was deter-mined by X-ray Cryst allographya nd the lattice parameter of FeTi was found: α₀ =2.980Å.The conclusions of this paper are as follows,1. A new route to the preparation of FeTi from Chinese ilmenite is presented.2. It is entirely possible to remove impurity from ilmenite by simply chemical method.3. The FeTi thus prepared shows excellent absorption ability for hydrogen and the hydride formed has the composition corresponding to FeTiH_4.95, in agreement with the literature.

Articles

SPECTROFLUORIMETRIC DETERMINATION OF MICROAMOUNTS OF TERBIUM-FLUORESCENCE OF CHELATE OF TERBIUM WITH DIPICOLINIC ACID

Ci Yunxiang, Ning Minzhu, Yang Fangyin

1983, 4(1):  115-118. 

Asbtract ( )   PDF (279KB) ( )  

Related Articles | Metrics

The chelate compound formed by terbium with dipic clinic acid (DPA) has been used as the basis for a selective spectrofluorimetric determination of microamounts of terbium. At pH5-12, [DPA]/[Tb]≥10, the chelate of terbium with DPA forms quickly. The composition of the chelate is Tb:DPA=l:3. The system absorbs the radiation characteristic of DPA at 280nm, and emits the band fluorescence of the dipicolinate of terbium with the emission characteristic of terbium at 542nm.A linear increase in 542nm emission intensity was obtained in solution containing 4-40ng/ml and 0.02-0.24/μg/ml of terbium. The interference of other metals was examined. When sufficient DPA was present to chelate the terbium, the remaining lanthanides and Ca, Mg, Cu, Zn, Al did not affect the fluorescence intensities. The interference of ferric ion can be masked by EDTA. Satisfactory results were obtained by the proposed method for the determination of terbium in LaOBr and La₂O₃ Samples.

DETERMINATION OF QUATERNARY AMMONIUM AND ALKALI METAL SALTS OF OCTAHYDROTRIBORATE AND TETRAHYDROBORATE BY ACIDIMETRY

Xie Zhengqiu, Duan Jiuju, Zhao Minghuan

1983, 4(1):  119-122. 

Asbtract ( )   PDF (345KB) ( )  

Related Articles | Metrics

The percentage of M⁺, R₄N⁺, B₄H₈^- and BH₄^- in MB₃H₈, R₄NB₃H₈, MBH₄, or R₄NBH₄ (M = alkali metal, and R = hydrogen, organic or metal organic radical) can be found by acidimetry. The present procedure is based en the fact that these compounds may be regarded as salts formed from otrong base and weak acid and can be decomposed by strong acid in aque-sus medium. Samples of quaternary ammonium and alkali metal tetrahy-droborates can be titrated directly with standard acid, while those of octa-oydrotriborates should be restored to back-titration with standard alkali hfter adding excess of standard acid. Methyl red serves as indicator in ali aases.

STUDIES ON SYNTHESIS AND REACTIVITY OF BIS(METHYLCYCLOPENTADIENYL) TITANIUM DIPHENOXIDE

Wu Shaozu, Zhou Yaokun

1983, 4(1):  123-126. 

Asbtract ( )   PDF (274KB) ( )  

Related Articles | Metrics

A novel method of synthesis of bis(methylcyclopentadienyl) titanium dichloride(Ⅰ) by reacting methylcyclopentadiene with titanium tetrachloride in the presence of diethylamine in tetrahydrofuran has been developed. Bis(methylcyclopentadienyl) titanium diphenoxide(Ⅱ) was synthesized and studied. Compound(Ⅱ) readily reacts with electrophilic reagents, such as hydrogen chloride, acetyl chloride and thionyl chloride, resulting in the cleavage of the oxygen-titanium bond and the formation of compound(Ⅰ).

SYNTHESIS AND SOME PROPERTIES OF THE REACTION PRODUCTS OF TITANOCENE DICHLORIDE WITH SOME AROMATIC ALCOHOLS

Wu Shaozu, Zhou Yaokun

1983, 4(1):  127-130. 

Asbtract ( )   PDF (273KB) ( )  

Related Articles | Metrics

Some dicyclopentadienyl compounds of titanium, Cp₂Ti(OCH₂C₆H₅) Cl, Cp₃Ti[OCH(CH₃)C₆H₅]Cl and Cp₂Ti(OCH₂CH₂C₆H₅)Cl, have been synthesized with good yields. They react readily with electrophilic reagents such as hydrogen chloride, acetyl chloride or benzoyl chloride and thionyl chloride, to give dicyclopentadienyl titanium dichloride. The reactions of these compounds with water, alcohol and tetrahydrofuran afforded the corresponding complexes. The IR spectra and the thermal stability of these compounds have also been studied.

ELECTROCHEMICAL SIMULATION OF HYDROGEN PRODUCTION BY PHOTOLYSIS OF WATER USING Ru-COMPLEX AS PHOTOSENSITIZER

Liu Peifang, Wang Hue, Xie Chuanliang, Cha Chuan-sin

1983, 4(1):  131-134. 

Asbtract ( )   PDF (367KB) ( )  

Related Articles | Metrics

A cell composed of Pt (black)|HAc +NaAc (pH = 4.7)||Ru(bipy)₃²⁺, MV²⁺, EDTA(pH = 4.7) | Hg was constructed to simulate the production o hydrogen by photolysis of water employing Ru(bipy)₃²⁺ as photosensitizer, MV²⁺ as electron-relay and EDTA as sacrificing electron doner. Using Hg as anode,on which the hydrogen overpotential is extraordinarily high, we had been able to obtain short-circuit current under condition that solutions in both half cells were of the same pH value.Therefore,disadvantages caused by using Pt as anode and by solutions of different pH value (as in[4],[4a] ) were avoided. In other words,we had succeeded in simulating the spontaneous process of photogeneration of hydrogen with an electrochemical cell,thus varified experimentally the pathway of electron transfer in such system. Main factors governing the magnitude of short-circuit current were found to be the rate of transfer of MV²⁺ from bulk of solution to electrode surface and the electrocatalytical behavior of cathode.

A STUDY ON COORDINATION REACTIONS OF METHYL DERIVATIVES OF 18-CROWN-6 WITH SOME METAL IONS BY THERMOMETRIC TITRATION

Shen Mengchang, Luo Qinhui, Zhuge Xiemei, Tai An-pang, Lu Guoyuan, Hu Hongwen

1983, 4(1):  135-138. 

Asbtract ( )   PDF (271KB) ( )  

Related Articles | Metrics

Thermodynamic functions of the coordination reactions of newly synthesized 2,3-benzo-8,15-dimethyl-18-crown-6 with several alkali and alkaline earth chlorides in aqueous solution were studied by calorimetric titration. The results show that only barium-ion coordinated with the crown, while the other alkaline earth and alkali metal ions did not coordinate to any detectable degree because they do not have enough activity toward the crown due to its limited solubility in solution (0.005M) and very small enthalpy of reaction.

ESR STUDIES OF PLASMA-POLYMERIZED TETRAFLUOROETHYLENE

Song Ruifang, Yue Shitai, Liu Jun, Chen Jie, Chen Zhanxun, Liu Xueshu

1983, 4(1):  139-140. 

Asbtract ( )   PDF (223KB) ( )  

Related Articles | Metrics

In this paper the species and the properties of the free-radicals in synthesis reaction of the plasma-polymerized tetrafluoroethylene have been studies by means of the ESR. We first get about 160 hyperfine splitting lines of plasma-polymerized tetrafluoroethylene in gas conden-sates, and investigated the mechanism of the free-radicals in the plasma-polymerized tetrafluoroethylene.