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中文
Table of Content
24 October 1984, Volume 5 Issue 4
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Articles
Determination of Crystalization Curve of Zeolite ZSM-5 by Liquid Adsorption Method
Zeng Zhaohuai, Yuan Guowei
1984, 5(4): 437-440.
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Anew method for determining the relative crystalline fraction of zeolite ZSM-5 based on its characteristic shape-selective adsorption in liquid has been presented. The result by this method is comparable to those obtained by the methods of X-ray diffraction and vapor adsorption of benzene.
Study on the UO
2
2+
-U(IV) Redox Displacement Chromatography ( Ⅳ ) ——Anionic Bed-Fe( Ⅲ )-TiCl
3
-FeCl
2
-HCl System
Liu Biao, Qiu Ling
1984, 5(4): 441-446.
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UO
2
2+
-U(Ⅳ ) redox displacement chromatography on anionic bed with Fe(Ⅲ)-TiCl
3
-FeCl
2
-HCl system is studied in detail.The migration rule of steady band and the rule of distribution of UO
2
2+
and U(Ⅳ) between two phases were clarified. Based on the fact that considerable amount of Fe(Ⅲ) is observed on the uranium plateau, the chemical reaction mechanisms occuring in the vicinity of the boundaries were proposed accordingly.
Studies on Dehydration Processes of the Hydrated Chloride of Cerium, Praseodymium, Neodymium and Samarium
Gong Zheng, Chen Peihang, Guo Zhizhen, Ma Jinhua, Chen Yunsheng
1984, 5(4): 447-450.
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By means of the TGand DTA, the dehydration processes of cerium, praseoymium, neodymiurn and samarium hydrated chlorides have been investigated under the different vapor pressure of water. The CeCl
3
·5H
2
Oand PrCl
3
·4H
2
O, which have not yet been reported in literature, are discovered.
Preparation and EPR Studies of 1,2,3,4-Tetraphen ylbutadienebis (Cyclopentadienyl) Niobuim(Ⅳ)
Liu Juzheng, Guo Yongyou, Petersen, J. L.
1984, 5(4): 451-456.
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The synthesis of metallacyclic derivative of niobocene dichloride, 1,2,3,4-tetraphenylbutadienebis (cyclopentadienyl) niobium (Ⅳ) are described. Solution and frozen-glass EPRspectra are measured. From computer simulation of the frozen-glass spectrum of Cp
3
NbC
4
ph
4
, the values of the principal components of the g and Ttensors are g
x
= 1.9915, g
y
= 2.0017, g
z
= 2.0005; T
x
= -69.5G, T
y
= - 103.2G, T
z
=-18.0G. The observed anisotropy for the hyperfine interaction arises from the admixture of 4d
z
2
and 4d
x
2
-y
2
character in the HOMO, The ratio of mixing coefficients, a
2
/b
2
=22.0.
Study on Accelerative Ion Exchange Elution Separation (Ⅱ)——Accerative Effect Exerted by Cu(Ⅱ)-Chloro Complex Ion
Jia Dongfang, Xiang Hongwen, Zhang Jiankun
1984, 5(4): 457-459.
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It was discovered that Cu(Ⅱ)-chloro complex ion appears accelera-tive effect to improve the chromatographic column effenciency of U(Ⅳ) species. For evaluating chromatographic characteristic was suggested a √lnC
0
/C' ~t graphic method by which the accelerative effect of Cu(Ⅱ)-chloro ion under different conditions was discussed. Finally, the chromatographic separation of U(Ⅳ), Ti(Ⅳ) and Fe(Ⅲ) was realized by the help of the accelerative effect of Cu(Ⅱ)-chloro ion.
Synthesis and Characterization of Mixed-Ligand Complex Ce(ph
3
PO)(DBM)
3
(NO
3
)
2
Zhu Wenxiang, Wang Deying, Chen Botao, Jin Linpei
1984, 5(4): 460-462.
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Amixed-ligand complex was prepared via intermediate complex Ce(ph
3
PO)
2
(NO
3
)
4
from a mixed-solvent of acetone and ethanol.Elemental analysis shows its formula to be Ce(ph
3
PO)(DBM)
3
(NO
3
)
2
. And its properties has also been studied by means of conductivity, IR, UVand
1
H NMRtechniques.
Cation Exchange Separation and Spectrophotometric Determination of Thorium and Rare Earths (Uranium, Scandium) by Using p-Acetylarsenazo as Eluting Agent
Li Buhai, Tian Shizhong, Yu Ximao, Wang Mingzhi, Cheng Jieke
1984, 5(4): 463-468.
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In this paper, a azo-type color forming reagent——p-Acetylarsenazohas been developed for an eluting agent. It has been used for the cation exchange separation of thorium and rare earths (uranium, scandium). The eluting components can be determinated directly with spectro-photometric technique. The method is more simple and rapid. The separation and continuous determination of the rare earths and thorium in the samples of ores were carried out. The results are satisfactory.
Laser-Enhanced Ionization Spectroscopy of Lithium in Flame
Bing Guide, Jin So, Jin Qinhan(Q. Jin), Peng Weixian, Ding Dajun, Zhan Zaixuan
1984, 5(4): 469-472.
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The laser-enhanced ionization spectroscopy(LEIS) behavior of lithiumin flame was studied. By making use of the transition 2
2
P
1/2,3/2
→3
2
D
3/2;5/2
of lithium atoms, the effect of laser position, flowrate of acethylene, voltage of cathode, acidity of sample solution and existence of sodium and potassium on the LEISsignal of lithium was examined.
Ten PVC Matrix Membrane Perrhenate Ion-Selective Electrodes Prepared With Basic Dyes ——Influence of Construction of Basic Dye on Performance of ReO
4
-
Electrode
Pan Jinghao, Hao Fuwen, Wang Weixing, Wang Heping
1984, 5(4): 473-476.
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Ten PVCmatrix membrane perrhenate ion-selective electrodes based on basic dye-ReO
4
-
are prepared. Their performances measured are very different. The electrodes prepared with ethyl violet, butylrhodamine B, brilliant green, crystal violet, night blue or methyl violt can be practically applied, the electrodes prepared with malachite green or rhoda-mine 6Gare not as good as 6 electrodes described above, and other two electrodes prepared with iodine green or rhodamine Bare hardly responsible for ReO
4
-
.It is proved experimentally that the performances of ReO
4
-
electrode are influenced remarkably by the construction of basic dye and this effect is mainly discussed in this paper.
Investigation on Oscillopolarographic Titrations (ⅩⅪ)——Oscillopolarographic Chelometric Titrations Using the Incisions Produced by Addition of Chelating Reagents to Mercury Electrodes
Tao Shuguang, Gao Hong(H. Kao)
1984, 5(4): 477-481.
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Oscillopolarographic chelometric titrations usually use the disappearance of the incisions of the electrode active ions to be titrated to indicate end-points of titrations. When the titrated ion is not electro-active, an indicator is usually required. It was found that EDTAand its related compounds such as DTPAand CyDTAcould complex with Hg
3+
ions produced on mercury electrode and thus yield incisions of Hg
2+
complexes which could be used to indicate the end-point of the chelometric titra-tion. Aseries of such titrations without indicators have been developed. It was shown that direct titrations of Ca
3+
, Mg
3+
, Sr
3+
, Ni
3+
, Mn
2+
, Co
3+
and lanthanide ions could be carried out with DTPA and CyDTA and even EDTA.
Studies on Colour Reactions of Quaternary Complexes of Cobalt with Chromazurol S, Pyridine and Its Analogs and Cation Surfactant
San Shusheng
1984, 5(4): 482-484.
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Studies have been carried out on the colour reactions of quaternary complexes of cobalt with chromazurol S(CAS), pyridine and its analogs and octadecatrimethyl ammonium bromide. The molar absorptivity of the quaternary complex is 1.05×10
5
1 mol
-1
.cm
-1
at λ
max
= 655nm. The composition and apparent stability constant of quaternary complex have been determined. Satisfactory results are obtained by the application of the quaternary complex in the spectrophotometric determination of small amounts of cobalt in the presence of large amounts of rare earth elements. The reaction mechanism has been discussed.
Extraction-Spectrophotometric Determination of Trace Mercury in Ores by Using Safranine T
Liu Changsong, Li Xinmin, Men Ying, Lu Jianxiu
1984, 5(4): 485-487.
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Anew sensitive method for the determination of trace mercury is proposed. Mercury (Ⅱ) reacts with Safranine T (C. I. Basic Red 2; C. I. 50240) to form a red complex in H
2
SO
4
medium in the presence of NaRr. The association complex is readily extracted by non-aqueous solvents, e.g. mixture of cyclohexane-butanone (3+2) or butylacetate. The absorbance of the extract is measured at 528nm (ε = 5.0×10
4
-5.4×10
4
1 mol
-1
cm
-1
) vs. mixture of cyclohexanebutanone (3+2) or butylacetate. Beer's law is obeyed for 0—5, 0—20 μg Hg/10ml. This method may be used in the analysis of ores.
Synthesis and Some Optical Properties of 1,4- Bis(Benzoxazol-2-yl) Benzene and Its 5,5'-Disubstituted Derivatives
Zhou Yimin, Zhang Dayang, Gao Zhenheng(Kao Chen-heng)
1984, 5(4): 488-492.
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1,4-Bis(benzoxazol-2-yl) benzene and nine of its 5,5' -disubstituted derivatives are synthesized. Their m.p., v
max
of UVspectra and fluorescence emission spectra, fluorescence quantum yields, as well as laser properties are given . Their IRspectra are also recorded.
Synthesis of Isochroman-4-one and Its Derivatives(Ⅰ)
Tan Zhiming, Yin Bingzhu, Jiang Guiji, Li Hesong
1984, 5(4): 493-498.
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Twenty-one of the derivatives of isochroman-4-one including five O-acyloximes, six Mannich bases and four 3-benzylidene substituted products of isochroman-4-one as well as six pyrirnidino- and pyrazolo-isochroman-4-ones are synthesized. The pharmacologic action of part of the Mannich bases cited abovce are studied.
Esterification of δ-Ketonic Acids
Huang Huamin, Li Yezhi
1984, 5(4): 499-502.
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3-(β-cyanoethyl)-2-butanone(Ⅰ), 2-(β-cyanoethyl)-cyclohexanone (Ⅱ) and 2-(β-cyanoethyl)-acetophenone (Ⅲ) have been prepared by treating
2
-butanone, cyclohexanone and acetophenone respectively with acrylonitrile in the presence of KOH/ethylene glycoi, and converted to corresponding δ-Keto-acids by reflux with dil. HCl . When these δ-Ke-tonic acids are refluxed with ferric sulfate hydrate three unsaturated. lactones that 5,6-dimethyl-3 ,4-dihydro-a-pyrone, △
9,10
-hexahydrocoumarin and 6-phenyl-3,4-dihydro-a-pyrone are obtained in yields of 77.8, 86.7 and 29% respectively. Moreover, the (3-Keto-acids above react with alcohols (mothanol, ethanol or butanol) by using hydrated ferric sulfate as catalyst to give (3-Keto-esters in 48-88% yields.
Studies on the Chemical Structure of Ilexolide A (Ⅰ)
Zeng Lonmei, Su Jingyu, Zhang Shude
1984, 5(4): 503-508.
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Ilex publesccns Hook et Am is an evergreen bush. It is used in China as a herb medicine. We have isolated from the root a new triterpenc glyco-side, namely ilexolide A, which exhibits cardiac activity.Ilexolide A ( I ) is a white amorphous solid, m. p. 214-216℃, [α]
D
+ 54.5(c, 0.83, alc.). It was hydrolyzed to afford the aglycone, ilexolic acid (Ⅱ), m. p. 288-289℃, [α]
D
+ 437 (c. 0.89 DMF). Ilexolide Ais xyloside of ilexolic acid (Ⅱ).Ilexolic acid, C
30
H
46
O
3
(M
+
454.3463) is a new triterpene acid having the structure of (Ⅱ). Its structure has been determinated by a series of characteristic chemical reactions and spectroscopic methods. MS, NMR and IR. In order to establish the structure and stereochemistry, single crystal X-ray structure analysis has been taken.
Preparation of Saturated Heterocyclic Compounds with 5-Membered Ring Containing Pentacoordinated Phosphorus
Denney Donald B, Denney Dorothy Z. , Liu Lunzu
1984, 5(4): 509-514.
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The reaction of a variety of saturated heterocyclic compounds with 5-membered ring containning tricoordinated phosphorus with trifluoroethyl benzenesulfenate or hexafluoroisopropyl benzenesulfenate yielded a series of corresponding cyclic phosphoranes. Variable temperature
19
FNMR studies of these compounds showed no change down to - 60℃ Reaction of compound(7) with excess trifluoroethyl benzenesul fenate yielded pentakis(trifluoethoxy) phosphorane (19), diphenyl disulfite(20) and compound(21)Compound(11) reacted with hexafluoroisopropyl benzenesulfenate to give compound (18) and (21). The mechanism of these reactions are discussed.
Analysis of the Chemical Ingredients of Angelica Sinensis——Analysis of Non-Volatile Constituents of Roots
Chen Yaozu(Yao Tsu Chen), Zhang Huidi
1984, 5(4): 515-520.
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In present paper, the results of analysis of non-volatile constituents of roots of "Min-gui" of Gansu Province, Angelica sinensis (Oliv.) Diels, have been reported. Thirty seven organic constituents have been identified, of which fifteen have not yet been found in Angelica sinensis before, including an optically active new compound named as Angelicide and an antibiotic Brefeldin A. The structure of Angelicide has been determined by IR, high resolution MS,
1
H NMR,
13
C NMRand single crystal X-ray diffraction. By plasma emission spectrometry, thirteen minor elements have been detected.
Study on Photo Oxidation Determination of Organic Nitrogen in Water
Wu Limin, Li Yingjian
1984, 5(4): 521-525.
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UV-irradiation has been known as an effective method for measuring the amount of total organic nitrogen of low concentration in natural water. In our work we have made some improvements: First, we have found that K
2
S
2
O
8
and H
2
O
2
as a mixed oxidant is more effective than other oxidants so that the irradiating time may be shortened from 2-4 hours to only 20 minutes. Secondly, the procedure for adjusting the pHhas been simplified. The pHcan be maintained in basic solution without the two-step irradiation or the addition of buffers. Thirdly, the quantitative recoveries of the common pollutants in solution, such as aniline and nitrobenzene, can be obtained. In this paper we also discuss the interference problems during the irradiating process, the influences of the concentration and structure of organic nitrogen compounds in the photo-oxidation process. Finally, we discuss the use of this method to analgze samples taken from the Songhuajiang River.
A Convenient Synthetic Method of Insetic Juveile Hormone Analogues——Citronellyl Aryl Ethers
Huang Naiju, Li Hongshan, Tao Fenggang, Xu Linxiao
1984, 5(4): 526-528.
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Most of citronellyl aryl ethers and their derivatives,which are insect juvenile hormone analogues, were obtained conveniently by the phase transfer catalytic reactions of citronellyl bromide with phenols or thiophenol under the solid-liquid two phase systems and polyethylene glycol was used as phase transfer catalyst in the reaction.
A Study on the Gas Chromatographic Properties of Commercial Resin Beads
Yu Zhongjian, Zuo Yumin, Wang Busen, Zhou Xiaoxin, Tang Dazhi
1984, 5(4): 529-531.
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Usually, in the manufacture of the ion exchangers, the smaller resin beads of styrene-divinylbenzene type are useless, but we found that if one of these polymers obtained from certain plant was processed by the method described in this paper, it may be used as stationary phase for GC. Its properties are very similar to those of Chromosorb 101 or Pora-pak P.
Determination of toe Thermodynamic Functions for Complexation Reactions of Ag (Ⅰ), Ni(Ⅱ) and Zn(Ⅱ) with Unsaturated Hydrocarbons by Gas-Liquid Chromatographic Method
Deng Guocai, Wang Lifang, Y. T. Cheng
1984, 5(4): 532-534.
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The thermodynamic functions of complexation reactions for Ag(Ⅰ), Ni(Ⅱ)and Zn(Ⅱ )with some unsaturated hydrocarbons have been determined at 40℃ by gas-liquid chromatographic method and the results obtained arc as follows: For Ag (Ⅰ)-ethylene, formation constant K
1
=21.8, △H =-7.7 kcal/mole. △S=-18.5 cal/deg.mole; For Ag(Ⅰ)-propylene, K
1
= 9.0, △H=-10.1 kcal/mole, △S =- 28.1cal/deg.mole. For Ni(Ⅱ)and ethylene, propylene and acetylene, the K
1
values arc 2.8×10
-1
, 6.1× 10
-3
, 3.4×10
-3
, respectively, and for Zn(Ⅱ)and ethylene, propylene and acetylene are 3.0×10
-3
, 1.0×10
-3
and 2.0×10
-2
, respectively. These data indicate that the stability of these complexes are of the following order: Ag(Ⅰ)>Ni(Ⅱ )>Zn( Ⅱ), which is also the order of the catalytic activities of the activated charcoal supported Ag(Ⅰ), Ni(Ⅱ) and Zn(Ⅱ) chlorides for the vapor phase hydrochlorination of acetylene.
The V Coupling Coeffcients from O
3
to O
h
Li Qianshu
1984, 5(4): 535-540.
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For the needs of treatment of ligand field theory with molecular orbital as the starting point,the relation between the three dimensional orthogonal group O
3
and the full octahedral group O
h
is discussed in detail, then the corresponding V-coupling coefficients from O
3
to O
h
is defined as an extension of those coefficents from R
3
to octahedral group 0 which have been proposed by Tang et al. Under some symmetry rules, the numerical values of the coefficients from O
3
to O
h
can be directly obtained from the values of the coefficients from R
3
to Owithout calculations.
Synthesis, Crystal Structure and Molecular Structure of {Mo[S
2
CN(C
3
H
5
)
2
]
4
}
+
{MoCl
6
}
-
Shen Cheng, Sun Chunting
1984, 5(4): 541-544.
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We have Synthesized a compound, for which molecular formula is {Mo[S
2
CN(C
2
H
5
)
2
]
4
}
+
{MoCl
6
}
-
, and determined its crystal structure by X-ray diffraction method. It is monoclinic, space group P2
1
/a, with cell dimensions a = 14.716(6) Å, b = 16.012(6) Å, c= 17.108(9)Å, β = 102.63 (4)° and Z=4. The structure was solved by Patter son method and refined by using the Least-squares method to final consistence factors R= 0.0908, R
w
= 0.0761.
Crystal Structure of 1,3-Bis(2'-Tetrahydrofuryl)-5-Fluorouracil
Hu Ninghai, Jiang Jiansheng, Shen Cheng, Lin Yonghua, Gao Dongyao
1984, 5(4): 545-548.
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1,3-Bis(2/-tetrahydrofuryl)-5-fluorouracil, C
12
H
15
FN
3
O
4
, crystals are triclinic system, a = 8.911(4)A, 6 = 11.744(5 ) Å, c = 12.320( 7 ) Å, α = 99.69(4)°, β = 93.49(4)°, γ = 97.83(4)°. Space group P1, Z = 4. The diffraction data (Cu K
a
) were collected with NICOLET R
3
four-circle diffractometer. The structure was determined by SHELXTLdirect methods and refined by the least-square program, R= 0.089.Comparing this structure with FT-207, we find that the structure features of their 5-fluorouracil rings are all the same as the one of 5-Fu. One more tetrahydrofuranose ring in FT-207 and two more these rings in FD-1 than 5-Fu make their structures quite different. They all are chemical anticancer drug, but FD-1 is the best one. Its curative effect is 1.7 times as much as of FT-207, and its toxicity is only 1/2 - 1/3 that of FT-207. The determination of crystal structure of FD-1 is helpful for revealing it's anticancer mechanism.
Adsorption of Photographic Spectral Sensitizing Dyes to Silver Bromide and Enthalpy of Adsorption Measurements
Geng Xinpeng, Shen Jieru, Zhang Zuxun, Zhong Guangxue
1984, 5(4): 549-554.
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The adsorption isotherms of c'yanine dyes Ⅱ and Ⅲ (1-methyl-1'-(γ-sulfopropyl)-2,2'-cyanine Ⅱ and its 6'-methyl analog Ⅲ) on AgBr suspensions in several solvents were obtained at 25℃ by centrifugation method. Corresponding absorption (reflection) spectra of these dyes in solutions and in adsorbed states over a wide concentration range were recorded. The solvent effect on dye adsorption and on the aggregation states of dye molecules were discussed. The very small heat effect in dye adsorption was measured at 25±0.01℃ with the Versatile Precision Semiconductor Calori-metric System developed in this lab using a specially designed calorime-tric unit. The precision environmental temperature control to 25±0.0001℃ is implemented by a microcomputer system. The isosteric molar heat of adsorption of dye Ⅱ in DMF-Water (1:1) to AgBr was obtained at 25℃ to be (3.18 ±0.09) kJ/mol (θ=0.87). Also calorimetric measurements were made for adsorption of dye Ⅱ in DMFto AgBr over a wide concentration range, and the isotherm expressed in terms of enthalpy per m
2
AgBr surface was drawn with the shape essentially in parallel with that obtained from the phase separation method. This result shows that the precision calorimetry can be used for the study of dye adsorption process.
The Study of Electronic Structures of Antitumor Medicine of 1-Furyl-and 1,3-Di-Furyl-5-Fluoro-Pyrimindinedione
Guo Chunxiao, Fan Yuguo, Liu Lanying
1984, 5(4): 555-558.
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Charges, bond orders, energies and dipole moments of 1-Furyl-and l,3-di-Furyl-5-Fluoro-Pyrimidinedione and its fragments for antitumor medicine have been calculated by using CNDO/2 method.It is further clarified by the results of the calculation that there exists certain relation between restraining cancer mechanism and electronic structures of medicine.
Electrophoretic Study of Surfactant Adsorption
Ma Chiming, Di Jifang
1984, 5(4): 559-564.
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The effects of adsorption of alkyltrimethyl ammonium bromides on the electrophoretic mobility of a monodisperse polystyrene latex have been examined experimentally. The adsorption isotherms were obtained from the electrophoretic date in terms of Stern electrical double layer model. An improved method was proposed for evaluating the number of adsorption sites and free energy of adsorption, and the possible mechanism of adsorption was discussed.
Solubility of Electrolytes in Mixed Solvents ——Systems of Salts, DMSO, DMF and Inert Solvents
Yang Jiazhen, Liu Ruilin
1984, 5(4): 565-570.
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Solbuility data of KCl, KBr, KClO
4
NaCl and NaBr in mixed solvents of DMSO, DMFand Inert solvents, are reported to be in agreement with the formula. 1gS
0
/S
m
= K
φ
φ
Ne
, The regularities of K
φ
values are discussed preliminarily,
Quantum Chemical Calculation of the Force Constants of Mg
2
+
and Other Diatomic Systems
Dai Dingguo, Chen Nianyi
1984, 5(4): 571-572.
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The force constants of HF, Mg
2
+
, Mg
2
2+
and [HeNe]
2+
were calculated by ab initio method of quantum chemical calculation. Some ther-modynamic quantities of these chemical species, including the S
700K
0
and △H
f
0
of Mg
2
2+
ion, were estimated.
A Kinetic Study of Alternating Copolymerization of Butadiene and Propylene Based on Vanadium-Aluminium Catalyst (Ⅲ)——Kinetic Parameters of Alternating Propagation and the Partial Reaction Orders of Two Monomers
Jiao Shuke, Huang Baochen
1984, 5(4): 573-578.
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On the basis of analysis of two monomers alternating propagation, the rate constants, i. e. k
B-P
and k
P-B
, reactivity ratio and activation energy were determined according to the hypothesis of steady-state. In addition, the partial reaction orders for two monomers were obtained through treating the data of polymerization rate by graphic method.
The Effect of Quaternary Ammonium Counterions on the Block Copolymerizations of α,α-Dimethyl-β-Propiolactone Initiated by Carboxy Pentanoyl End Groups
Jiang Shuojian, Hao Wenzhang, Liu Baojian, Feng Xinde
1984, 5(4): 579-584.
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The effect of tetramethyl ammonium, triethyl benzyl ammonium, tetrabutyl ammonium, tetrapentyl ammonium and tripentyl benzyl ammonium counterions on the block copolymerizations of a, a-dimethyl-β-propiolactone(PVL) initiated by poly(l,2-propandiol adipic acid ester) (PPA) terminating with carboxy pentanoyl end groups were studied. The average block efficiencies were obtained separately as 45% ,57%,7% ,87% and 78%. It was observed that the spectra of unblocked PPAfrom polymerization solutions were similar as that of the original PPAexcept small absorption bands of anhydride and carbon-carbon double bond at 1760 and 1610cm
-1
.The mechanisms of these initiations were discussed. It was proposed that there existed two mechanisms of carboxylate ions attacking on alkoxy and acyl carbons of PVLat the same time in these initiations, the former mechanism gave the block copolymers and the latter gave the homopolymer through a chain transfer. Various quaternary ammonium counterions may vary the ratios of these two mechanism, thus may vary block efficiencies.
Organomagnesium Compounds as Promoters for Increasing the Catalytic Efficiency in the Polymerization of Ethylene
Wang Haihua, Zhang Qixing, Xu JiaruiLu Yun, Lin Shangan
1984, 5(4): 585-590.
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The action of organomagnesium compounds on promoting the catalytic efficiency of the highly active catalyst of Ti system with MgCl
3
as carrier for polymerization of ethylene has been studied. It was found that the promotive effect increases with the content of MgCl
3
in the composited carrier. The scanning electron micrographs of several MgCl, supported catalysts before and after treatment with organomagnesium compound show that morphology of the treated catalyst displays globular micrograin cluster which is finer and more porous than that of the untreated one. It has been suggested that the promotive action given by organomagnesium compounds includes raising porosity of the carrier, as well as electronic effect of the modifying ligand's towards the active center Ti
+3
.
Preparation of Alkaryl Ethers Through Phase Transfer Catalysis
Chen Jichou, Chen Shaoyuan, Ma Shuwen, Lu Shiping, Zheng Wenjun
1984, 5(4): 591-592.
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Eleven alkaryl ethers have been synthesized by means of Phase Transfer Catalysis. In comparison with original Williamson's method, the present procedure has the advantages of high yield, simplicity in operation and the reaction can be performed at room temperature.
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