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Table of Content
24 August 1988, Volume 4 Issue 3
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Articles
Preparation and Characterization of Heteropoly-complex K
11
[La(GaW
11
O
39
H
2
)
2
]· xH
2
O
Zhu Zhiping, Liu Jingfu, Zhao Benliang, Sun Yuhao
1988, 4(3): 1-8.
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Heteropoly complexes K
11
[Ln(CaW
11
O
39
H
2
)
2
1·x H
2
O(Ln=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy ) have been prepared and analysed. Some properties such as thermal behavior, IK and UV spectra, X-ray powder diffraction, magnetic susceptibility and X-ray photoelectron spectrum have been investigated.
A Study on Coordination Compounds of Diacetylpyridine bis (semi-carbazone) with Some Transition, Metal Ions by Spectrophotometry
Shen Mengchang, Luo Qinghui, Zhang Hongchang, Zhang Zheng, Tu Qingyun
1988, 4(3): 9-16.
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We synthesized 2,6-diacetylpyridine bis(semicarbazone)(DAPSC) and studied its coordination reaction with Cu, Co, Ni and Zn, in ethanol and in DMF spectrophotometrically. We realized that the ligand DAPSC in ethanol and in DMF does not dissociate and exists in ketonic form by conductometry and IK. The composition and stability constants of coordination compounds were calculated by graphic method and by self-written program. The results obtained by the two methods are in agreement with each other. The results showed that complexes of ML type were formed in ethanol and those of M
3
L
2
tyPe in DMF. The sequence of lgβ is as follows: Co > Cu >Ni >Zn.
Synthesis, Characterization and Structure of 3d Metal Nitrate Complexes with 1,8-Naphthyridine-N-Oxide
Tan Minyu, Gan Xinmin, Tang Ning, Zhang Wenjun, Wang Xin, Zhu Yin
1988, 4(3): 17-23.
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The complexes of 3d metal(Cr, Mn, Fe, Co, Ni, Cu, Zn) nitrates with 1,8-naphthyridine-N-oxide (NAPYO) were synthesized. The melting points and solubilities of the new complexes were determined and all the complexes were characterized by elemental analyses, IR spectra, UV spectra and molar conductance. The structures of both nickel complex and copper complex were determined by X-ray single crystal diffraction analyses.
Research on the Synthesis and Optical Properties of Isomeric Bichromophoric Compounds --3-or 4- Phenyl 7-Coumarin ω-9-Anthracene-Poly-methene Carboxylate
Kao Chenheng, Zhou Yimin, Wang Pingbao
1988, 4(3): 24-33.
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)
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Six bichromophoric compounds-substituted coumarin ω-9-anthra-cene-poly-methene carboxylate and five model compounds were synthesized. Among them, eight compounds are new ones. Intramolecular singlet energy transfer has been demonstrated in the bichromophoric compounds 1-6 and studied in some detail. The absorption spectra of the compounds 1-6 bear evidence that the π-electron systems of coumarin and anthracene ring do not overlap appreciably. The coumarin moiety of the bichromophoric compounds molecule was excited at 314nm and the resulting fluorescence was characteristic of the anthracene group. The efficiency of transfer of singlet excitation from coumarin moiety to the anthracene grou is about 100% in both calculation and observation and the rate of the singlet energy transfer is about 10
14
sec
-1
in the compounds 4-6. A possible mechanism of intramolecular energy transfer was suggested. The difference between 4-phenyl compounds 1-3 and 3-phenyl compounds 4-6 in spectra was com -pared.
Calculating the Activity Coefficient of Phosphate in Various Diluent by the UNIFAC Method
Wang Liya, Zhong Yunxiao
1988, 4(3): 34-39.
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This paper extends the UNIFAC method to calculate tne pnospnate-diluents systems. The parameters of interaction between (-O)
3
P=O and CH
2
, CCl
4
, CHCl
3
, ACH, ACCl, CH-O, H
2
O etc. are determined with the experimental data of Tri-iso-butylphosphate(TiBp)-diluents and Tri-(2-ethyl)hexylphosphate(TEHP)-diluents systems. These parameters were applied to calculate the activity coefficient of TBP-diluents and TEHP-diluents systems. The result agrees excellently with experimental data.
A Theoretical Study of Photochemical Reaction for Synthesis of Thiirane
Yu Hengtai, Shen Erzhong, Ye Yuanjie, Zhang Gang
1988, 4(3): 40-45.
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The geometrical configurations of the products in reaction of sulfur and ethylene are optimized by use of UHF method and 3-21G basis sets and the potential energy surfaces for resulting thiirane are calculated using STO-3G + CI(100×100) . The possibilities of obtaining the thiirane on the surfaces of low-lying excited states are discussed. The energies of low-lying excited states of thiirane and the corresponding configurations are predicted by using 4-31G basis sets + CI(100×100) finally.
Studies on SPE-Hydrophobic Gas Diffusing Electrodes (I) --Electrode Structure and Reduction of Oxygen
Yan Heqing, Lu Juntao, Wang E'feng
1988, 4(3): 46-51.
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A type of SPE-electrode, the SPE-hydrophobic gas diffusing electrode was reported and its characteristics were discussed,The reduction reaction of oxygen was examined at the Nafion-hydrophobic gas diffusing electrode with the counter electrode in contact with 1mol/L H
2
SO
4
, 1mol/L NaOH and distilled water, respectively. When contact with H
2
SO
4
the electrode was found to behave just like a conventional gas diffusing electrode facing tree electrolyte, while contact with NaOH, however, the performance of the electrode decayed rapidly in the course of operation and no steady state could be reached. These observations and the results of apparent capacitance measurement reveal that the working electrode interface is the interface between the catalyst and the free electrolyte contained in the catalytic layer and that the electrode performance was seriously influenced by the selective ion-permeability of SPE and liquid phase resistance within the catalytic layer.
Studies on Oxidative Coupling of Methane Catalysed by Li-Ce-Sr Oxides
Bi Yingli, Zhen Kaiji, Sun Chengwen, Yang Xiangguang, Cao yaan
1988, 4(3): 52-61.
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The conditions for catalyst preparation and coupling reaction of methane were investigated. The experimental results showed that under the catalysts the selectivity for C
2
formation may reach 98.5% and the yield 28.2% (the average within the first 30 minutes). A stale selectivity and yield for C
2
formation obtained after reaction for 2h were 48.4% and 20.6%, respectively. Some kinetic parameters were also determined, including activation energy and the partial pressure dependence of the catalytic reaction rates. Finally a preliminary explanation of the reaction mechanism is suggested.
Phase Diagram of RbI-SmI
2
Binary System and Structural Investigation of RbSm
2
I
5
and RbSmI
3
Zhao Xinhua,Wang Shihua, Jiang Shengbang
1988, 4(3): 62-69.
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The RbI-SmI
2
, binary system was studied with DTA and X-ray powder diffraction. Its phase diagram shows that it has a congruently melting compound,RbSm
2
I
5
, with a melting point 524℃; an incongru-ently melting compound, Rb
2
SmI
4
, with an inconsruently point 467℃ and two compounds, RbSmI
3
, and Rb
3
SmI
5
, being decomposed at 433℃ and 460℃, respectively. The measured structure of RbSm
2
I
5
shows that it is isomorphous with NH
4
Pb
2
Cl
5
space group P2
1
/c, a=10 . 063(3)Å, b=9.003(3)Å. c =14 . 242(5)Å,β=90.23(3)°;z = 4, MV
x
= 1 94 . 3cm
3
/mol;D=5.255g/cm
3
and D
o
=5. 334g/cm
3
(25. 0℃).The structural, investigation of RbSmI
3
shows that it belongs to the orthorhombic system with a = 15.914(6)Å, b=8.898(3)Å c =12.193(5)Å; Z=8, MV
x
=130.0cm
3
/mol, D
x
=4 . 743g/cm
3
,D
o
= 4.597g/cm
3
(25.0℃).
On the Curing Theory and Scaling Study -The Polycondenzation of A
a
-B
b
Type
Tang Auchin, Li Zesheng, Sun Chiachung, Tang Xinyi
1988, 4(3): 70-79.
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In this paper, a systematic way is proposed to treat the poly condenzation reaction with two species of monomers A and B having a-and b-functionalities, respectively. The polycondenzation reaction is considered as a whole to approach gel point which can be equivalently represented by three different kinds of forms. Furthermore, by means of a reasonable way without Stirling's approximation, the asymptopic form of the equilibrium number distribution characterized by A-B type near the gel point is obtained to reach a generalized scaling law.
Stress-Strain Properties of Polyolefine Filled with Plasma Treated Mica
Gong Xiaoyi, Xu Xi, Liu Xueshu
1988, 4(3): 80-85.
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The stretching behavior of polyolefine filled with mica was studied through an Instron tensile tester, the mica surface was treated by ethylene plasma of radio frequency. The results show that the elastic modulus of HDPE, LDPE and PS filled with mica increases linearly with volume fraction of mica(V
f
) and can be evaluated from the equation E = E
m
(1-V
f
) + AE
f
V
f
,where A is a measure of effectiveness of plasma treatment, subscripts m and f represent matrix and filler respectively. The breaking strength of LDPE and PS filled with mica decreases with V
f
at first then tending toward a limited value which is higher when the treated mica is filled. The dependence of breaking strength of filled HDPE on V
f
agrees with the generalized Nielsen's equation irrespective of plasma treating. The breaking elongation of filled PS might be enhanced by the treatment. No evidence indicating any influence of plasma treatment on breaking elongation of HDPE or LDPE filled with mica was observed.
Studies on Flavonoids (XII) --Synthesis of 7-0-(β-D-Mannopyranosyl) -Flavone and Determination of Its Configuration
Zhang Peiying, Qian Lei, Gao Congyuan, Wang Dong, Cai Mengshen
1988, 4(3): 86-89.
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Studies oh Activity Coefficients of ο -, m -, P- Xylene in Aqueous Salt Solutions(IV)
Xie Ximing, Xie Wenhui
1988, 4(3): 90-94.
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)
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Editor-in-Chief:
Jihong YU
ISSN 1005-9040
CN 22-1183/O6
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