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Table of Content
24 December 1996, Volume 12 Issue 4
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Articles
Synthesis,Proton Conductivity and High-Temperature Humidity Sensing Property of Zr(HPO
4
)
2
·H
2
O and Its Aluminium-substituted Compositions
WANG Ge, FENG Shou-hua, WANG Bo, Martha Greenblatt
1996, 12(4): 313-321.
Abstract
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)
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A series of aluminium-containing α-type hydrated zirconium hydrogen phosphates,Zr
1-x
Al
x
(H
1+x/2
PO
4
)
2
with x=0-0.06,were hydrothermally synthesized and characterizedby means of X-ray diffraction,differential thermal analysis and thermogravimetric analysis.The proton conductivity,1.2×10
-4
S·cm
-1
at 180℃ was found in Zr
0.98
Al
0.02
(H
1.01
PO
4
)
2
·H
2
O.Humidity-sensing measurements were carried out at 120℃ and 140℃ respectively.Even a limited substitution of Al for Zr can enhance both proton conductivity and humidity sensitivity.
Researches into the Proton Conductivity of Molybdovanadophosphoric Acids with Wells-Dawson Structure
WANG En-bo, LI Bai-tao, WANG Zuo-ping, ZHANG Bao-jian
1996, 12(4): 322-325.
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)
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Five kinds of molybdovanadophosphoric acids H
7
[P
2
Mo
17
VO
62
],H
8
[P
2
Mo
16
·V
2
O
62
],H
9
[P
2
Mo
15
V
3
O
62
],H
8
[P
2
Mo
14
V
4
O
61
(H
2
O)]and H
9
[P
2
Mo
13
V
5
O
61
(H
2
O)]have been synthesized.Their protop conductivities(C) have been measured.The effects of three main factors (frequency,hydration numbers,temperature)on the conductivity have been investigated.In some degree,heteropoly compounds with different structures give a different conductivity.
Studies on the Stability of Four-membered Ring Chelates (Ⅳ)──Sulphur Coordinated Xanthate Complexes
ZUO Ben-cheng, YANG Yue-hui, ZHANG Xiao-ling, ZHU Hong-tao
1996, 12(4): 326-331.
Abstract
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)
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Fifteen M(S
2
COR)
n
complexes were prepared.According to the data provided by IR,UV-Vis absorption spectrometry and X-ray diffraction,this paper covers the relationship between molecular structures of xanthate complexes and their absorption spectra and a criterion of chelate stability is also proposed.The stability mechanism of xanthate chelates and related rules were investigated.
Studies on Rare Earth Complexes with Open-chain Crown Ethers(Ⅶ)──Preparation,Characterization and Structure of Rare Earth Complexes with N,N'-Diethyltriglycollic Dianilide
GAN Xin-min, LIANG Zhi-jian, LU Tong-bu, TANG Ning, TAN Min-yu, YU Kai-bei
1996, 12(4): 332-339.
Abstract
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)
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Complexes[Ln(L)(Cl
2
]Cl·3H
2
O (Ln =La, Pr, Nd,Sm,Eu,Gd,Dy,Er and Lu)and[Lu(L)(H
2
O)(NO
3
)
2
]NO
3
(L=N,N'-diethyltriglycollic dianilide)have been prepared in the nonaqueous medium,the new complexes of which have been characterized by means of elemental analysis,conductivity measurements,IRspectra,
1
H NMR spectra and TG-DTA techniques.In all the complexes,the organic ligand showed tetradentate behaviour.The structure analysis of [Lu(L)(H
2
O)(NO
3
)
2
]NO
3
showed that the lutetiurn atom is nine-coordinated by one tetradentate ligand , two bidentate nitrate groups and one water molecule with the following mean bond lengths:Lu—O(etheric),0.2396;Lu—O(carbonyl),0.2245;Lu—O(nitrate),0.2397;Lu—O(water),0.2296 nm.
Permselectivity of 4-Aminophenol,Paracetanol and Phenacetin on the Self-Assembled
n
-Alkanethiol Monolayer Modified Gold Electrode
Li Jing-hong, LIU Zhi-ming, DONG Shao-jun, WANG Er-kang
1996, 12(4): 340-347.
Abstract
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)
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The gold electrodes coated by n-alkanethiol with various chain lengths were used to study the permeability of uric acid,ascorbic acid,4-aminophenol,paracetanol and phenacetin by means of linear sweep voltammetry.The results show that the optimum chain length is n=10.The improvements in the selectivity and the stability of the amperometric detection of these compounds in a flow stream were obtained by n-alkanethiol self assembled monolayers modified electrodes based on their differences in the hydrophobicity and the permeability.
Determination of Trace Amounts of Cobalt and Copper by High Performance Liquid Chromatography with Indigo Carmine Chemiluminescence Detection
ZHANG Xin-xiang, CHENG Jie-ke, ZENG Yun-e
1996, 12(4): 348-353.
Abstract
(
)
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A post-column reaction chemiluminescence detection method in ion chromatography is described in this paper.The chemiluminescence system was indigo cramine-hydrogen peroxide. The chemiluminescence reaction conditions and the separation conditions of Co and Cu in chromatography were presented.The detection limits were 1.0 and 2.0×10
-8
g/mL for Co and Cu respectively.
A Highly Stereoselective Synthesis of 2-Carbomethoxy-3-aryl-4-carboethoxy-5-methyl-
cis
-2,3-dihydrofurans
DING Wei-yu, CHEN Ya-li, ZHANG Yi, YAO Yuan
1996, 12(4): 354-359.
Abstract
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)
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Carbomethoxymethylenetriphenylar reacts with ethyl 2-acetyl-3-arylacrylates to afford 2-carbomethoxy-3-aryl-4-carboethoxy-5-methyl-2, 3-dihydrofuran via Michael addition in high to excellent yields with high stereoselectivity.
Syntheses and Herbicidal Activity of New Pyrimidinyl(triazinyl)oxy Substituted Carboxylic Derivatives
LI Zheng-ming, LIAO Yun, WANG Ling-xiu, YANG Zhao
1996, 12(4): 360-367.
Abstract
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)
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13 New compounds were synthesized,which belong to 3 types of pyrimidinyl(triazinyl)oxy substituted carboxylic derivatives respectively.In bioassay,the effects of the structural factors on the herbicidal activity were investigated,in which the stereochemistry has a strong influence on the activity.
Ab initio
Studies on the Reaction of M
+
+CH
4
→M
+
CH
2
+H
2
(M=Sc,Y,La)
ZHU Rong-shun, DAI Shushan, HUANG Jian-hua, YE Song
1996, 12(4): 368-373.
Abstract
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)
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The present paper covers the reactions of M
+
+CH
4
→M
+
CH
2
+H
2
(M=Sc,Y,La)investigated theoretically using ab initio MO methods and reaction channels onthe singlet potential energy surfaces (PESs) examined and discusses the reactionmechanism. The results indicate that the formation of M
+
CH
2
is primarily via a sin-glet H—M
+
—CH
3
intermediate,followed by a four-center elimination of H
2
,all ofthese reactions have negative activation energies and the trend of reactivity is La
+
>Sc
+
>Y
+
.
Regeneration of Q-State PbS Particles in Langmuir-Blodgett Films
WU Yu-qing, XU Wei-qing, ZHAO Bing, TAO Yan-chun, WU Ying, LI Bo-fu
1996, 12(4): 374-377.
Abstract
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)
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The regeneration procedure of Q-state PbSparticles in lead arachidate(PbAr)Langmuir-Blodgett films have been studied by means of UV-vis absorption, FT-IR spectra and quartz crystal microbalance(QCM) measurements.The results showed that the mole fraction of PbS particles in LB films was increased by immersing PbS containing ArH LBfilms in a Pb
2+
buffer solution,followed by being reexposed to H
2
S gas.
An SCF-MS-Xα Study of the Electronic Structures of Binuclear and Trinuclear Gold(Ⅰ)Compounds
GUO Chun-xiao, CHAN Chi-keung, CHE Chi-ming
1996, 12(4): 378-389.
Abstract
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)
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The SCF-Xα-SWmolecular orbital calculations were carried out on the modelcompounds of binuclear and trinuclear gold(Ⅰ)using starting potential of Au atom and the Watson sphere.The energy level order of the frontier orbital of a binuclear gold model compound is in agreement with the experimental result.The calculated ionization potential of the binuclear model compound is consistent well with the photoelectron spectrum of Au (Me)(PMe
3
).The metal-metal interactions are discussed.The calculated electronic absorption spectra of binuclear and trinuclear gold(Ⅰ)are basically in agreement with experimental results.
Synthesis and Diffuse Reflectance Spectrum of Open-framework Cobalt Phosphate DAF-2 From Alcoholic System
YU Ji-hong, CHEN Jie-sheng, XU Ru-ren
1996, 12(4): 390-392.
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)
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Preparation and
183
W NMR Investigation of Iridium-containing Dawson Derivative
LIU Hui-zhang, YUE Bin, LI Ming-xing, CHEN Zhi-jiang, JIN Song-lin, XIE Gao-yang
1996, 12(4): 393-396.
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)
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Phase Transfer Research for Heteropolyanions Containing Cr(Ⅲ),Mn(Ⅳ),Co(Ⅱ),Zn(Ⅱ)
ZHANG Shu-yun, HUANG Ru-dan, YU Xin-wu, LI Baitao, WANG En-bo
1996, 12(4): 397-400.
Abstract
(
)
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Detection of Combustible Gases by Semiconductor Sensors──Rapid Separation of Hydrogen Sulphide with β,β'-oxydipropionitrile
YANG Yan-ming, WANG Xiao-ru, YANG Peng-yuan, CAI Lu-xin
1996, 12(4): 401-406.
Abstract
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)
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Editor-in-Chief:
Jihong YU
ISSN 1005-9040
CN 22-1183/O6
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