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中文
Table of Content
24 February 1992, Volume 13 Issue 2
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Articles
Studies on the Complexes of Rare Earth with Organic Ligands Containing Sulphur Atoms (Ⅷ)——Synthesis and Properties of Poly nuclear Complexes of Rare Earth Acetates with Nickel Glycinemethanedithioate
TANG Ning, CAN Xin-min, ZHANG Wei-guang, SUN Fu-yan, TAN Min-yu, JIANG Zhi-cheng
1992, 13(2): 141-144.
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The new polynuclear complexes of rare earth acetates with nickel gly-cinemethanedithioate were synthesized in the aqueous alcohol solution and characterized by elemental analysis, solubility, infrared spectra, X-ray photoelectron spectroscopy and
1
H NMRThe results show that the composition of the complexes are RENi(Gc)
2
Ac·H
2
O(RE = La-Gd, except Ce, Pm; Gc=glycinemethanedithioate) and RE
2
[Ni(Gc)
2
]
3
·xH
2
O(RE = Tb-Lu, Y; x = 4,8,10).
Studies on the Ageing Mechanism for the Directing Agent of Zeolite L
LI Shou-gui, LI Xi-kai, XU Ru-ren
1992, 13(2): 145-148.
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The ageing mechanism for the directing agent of zeolite Lwas studied by means of NMRand Laser-Raman spectroscopyThe experimental results show that after mixing the sources of alumina and silica the polymerization between aluminate and silicate anions is very rapid and at the same time the silicate anions of high degree of condensation are depolymerizedThe controlling step of the ageing reaction for the directing agent of zeolite Lis directional polymerization between aluminosilicate oligomers or between aluminosilicate and silicate oligomers.
Magnetic Properties and Electronic Structures of Dinuclear Copper Complexes of Pyrazole-3,5-bis(N-alkylformamides)
FU De-gang, WANG Guo-xiong, TANG Wen-xia
1992, 13(2): 149-153.
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Three analogous compounds of dinuclear copper complexes with bridged pyrazole molecules were synthesizedThe ESRspectrum of [((Pz)-3, 5-(CONMe)
2
Cu)
2
(H
2
O)(NO
3
)](NO
3
) powder was used to estimate the values of g
∥
and g
⊥
Then the experimental data of variable temperature susceptibility were fitted to the Bleaney-Bowers equation and the results show that the magnetic properties of the three compounds are all strongly antiferromagneticSemiempirical MOmethod was used to analyze their magnetic exchange paths.
Synthesis, Characterization and Reaction of N-Substituted Iminodiacetatoplatinum Complexes
YANG Zhi-yong, YANG Zhen-yun, HU Jie-han, DING Dao-yuan
1992, 13(2): 154-156.
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A series of water-soluble N-substituted iminodiacetato diamine platinum complexes were synthesized and characterized by IRand
13
C NMRThe results show that iminodiacetate coordinates towards platinum through nitrogen and one of the two carboxyl groupsThe conductivity data indicate the complexes are relatively stable in aqueous solutionHPLCwas used to study the complexation of Guanosine with Pt complexes and the kinetic results give that the reaction rate is cis-platin>carboplatin>iminodiacetatoplatinum.
Studies on the Synthesis and Bonding Specificity of Rare Earth (Ⅲ) Complexes with Naphthyloxyacetic acid
CAO Jin-rong, WANG Ze-min, ZHU Fu-sen, WANG Ting
1992, 13(2): 157-159.
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Seven new solid complexes of rare earth (Ⅲ) with naphthyloxyacetate ion with a general formula of Ln(NOA)
3
·xH
2
O(Ln = La
3+
, Nd
3+
, Sm
3+
, Gd
3+
, Tb
3+
, Dy
3+
, x = 2; Ln = Y
3+
, x=1; NOA = C
10
H
7
OCH
2
COO
-
) were synthesized in aqueous solutionThe electronic spectra of complexes were observedThe molar conductance data show that the complexes do not ionize in DMFIRspectra and
1
H NMRspectra or XPSmeasurement indicate that the rare earth (Ⅲ) ions are coordinated with the carboxylate ions in Ln(NOA)
3
·xH
2
Ocomplexes, and these coordinate bonds are not purely ionic ie., but have some covalent character.
Preparation of Discretely Hanging Aqueous Drop Liquid/Liquid Interface Electrolytic Cell with Four Electrodes
YU Ba-zhang, LIU Xu-hui, LI Pei-biao, ZHAO Zao-fan
1992, 13(2): 160-162.
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A new hanging aqueous drop electrolytic cell has been constructed which could provide a microdisc(0025 mm
2
) or a spherical(3～20 mm
2
) liquid/liquid interfaceThe drops could be renewed easily by a microsyringe and stabilized for about 1 hThe voltammetric results of the te-traethylammonium ionic transfer across the water/1,2-dichloroethane interface show the cell is suitable for the electrochemical studies at liquid/liquid interface.
Determination of Strontium by Micro-Sampling Acetylene Air Flame Atomic Absorption Spectrometry in the Presence of Sulfosalicylic Acid
WANG Jin-cheng, ZHENG Yan-sheng
1992, 13(2): 163-166.
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The present paper covers the influence of ten types of surfactants on absorption signal of strontium in acetylene air flameThe absorption signal of strontium was increased by 50% in the presence of sulfosalicylic acidAt the same time it can reduce and eliminate the interference of foreign ionsThe determination of strontium by micro-sampling flame atomic absorption spectrometry with 0.5% sulfosalicylic acid as a matrix modifier was proposedThe method can be applied to the determination of strontium in wild cabbage with the satisfactory result.
The Repeatability of A. C. Oscillopolarogram
ZHENG Jian-bin, BI Shu-ping, GAO Hong(H. Kao), BU Hai-zhi, ZHAO Shou-xiao, CHEN Xian-yao, GUO Qing-dong
1992, 13(2): 167-170.
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A better circuit of acoscillopolarography is reportedThe circuit consisting of integrated computative amplifiers was used to study the repeatability of acoscillopolarogram in the case of experimental parameters exactly controlled and carefully recordedThe experimental results show that the repeatability of acoscillopolarogram is good,and it is possible to apply acoscillopolarogram to the qualitative identitication of organic substances and organic drugs.
Simultaneous Determination of Copper and Cobalt by Using Partial Least Squares and pH Gradients Technique in FIA
LI Hua-chang, MAN Rui-lin, ZHAO Xin-na
1992, 13(2): 171-174.
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The present paper covers the simultaneous determination of copper and cobalt by pHgradient technique with PARas the chromogenicreagentPartial least squares (PLS) was used for calibration and prediction, and satisfactory results were achievedCompared with principal component regression (PCR) and multi-linear regression (MLR), the result of PLSis better.
Studies on Determination of Trace Lead by Metastable Energy Transfer Emission Spectroscopy
YU Ai-min, FAN Fu-liang, JIN Qin-han
1992, 13(2): 175-178.
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The determination of trace lead with metastable energy transfer emission spectrometry is describedThe active nitrogen is produced in a microwave discharge SurfatronThe sample solution was introduced with an electrothermal vaporization systemThe experimental parameters affecting the determination of lead were examinedThe detection limit of lead line at 283.3 nm is 0.12 ngThe method has been applied to the analysis practical samples and the result is satisfactoryThe mechanism for the metastable energy transfer of active nitrogen induction by Surfatron was studied and discussed.
Application of Oscillo-indicating Technique to Kinetic Analysis (Ⅲ)——Determination of Copper and Iodine by Catalytic Method with Oscillo-biamperometry
HUANG Lan, GAO Hong(H. Kao)
1992, 13(2): 179-180.
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This paper reports the application of oscillo-indicating technique to kinetic analysisCu (Ⅱ) and I
-
are determined by oxidation of Na
2
S
2
O
3
with Fe(Ⅲ), which is catalyzed by Cu(Ⅱ) and by oxidation of As(Ⅲ) with Ce(Ⅳ), which is catalyzed by I
-
, respectivelyThe detective limit reaches 2× 10
-7
mol/Lfor Cu(Ⅱ) and 2× 10
-8
mol/Lfor I
-
This method shows advantages of sensitivity, convenience and economy.
Studies on Determination of Trace Amitriptyline with Nafion-Modified Electrode
LENG Zong-zhou, HU Xiao-ya, JIN Li-tong
1992, 13(2): 181-183.
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Amitriptyline is an electroinactive cationic drugThis paper describes the method for the determination of trace amitriptyline with .Nafion-modified glassy crabon electrode, and discusses its reaction mechanismThe peak current of dopamine is decreased when amitriptyline is added to an electrolyte solution containing electroactive dopamineThere is a good linear relationship between the extent of the decrease in the peak current and the logarithmic concentration of amitriptyline in the range of 2.5×10
-7
～4.0×10
-6
mol/LThe detection limit of the method is 1×10
-7
mol/LThe recovery is 95.3～106.0%, and the C.Vis 3.6%(n= 10).
Studies on Transport of Lead(Ⅱ), Zinc(Ⅱ) and Copper (Ⅱ) in Dithizone-Mediated Emulsion Liquid Membrane System
LI Ke-an, WANG Yan, FENG Jian-zhang, TONG Shen-yang
1992, 13(2): 184-186.
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The transport of lead(Ⅱ), zinc(Ⅱ) and copper(Ⅱ) in dithizone-mediated emulsion liquid membrane system was studiedThe transporting behavior of lead(Ⅱ) in the liquid membrane system is reported in detailBecause of the selectivity of dithizonethe separating of lead (Ⅱ) from zinc(Ⅱ), copper (Ⅱ) from zinc(Ⅱ) can be completed by using this liquid membrane system.
Synthesis of Bis(1-Acetyl-4-Aroylthiosemicarbazides) and Their Derivatives
FENG Xiao-ming, CHEN Rong, YANG Wei-dong, ZHANG Zi-yi
1992, 13(2): 187-190.
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A series of new bis(1-acetyl-4-aroylthiosemicarbazides) Ⅱ were synthesized by condensation of aroylisothiocyanates with succinylhydrazine Ⅰ in acetonitrileSome bis(3-methenyl-4-aroyl-l,2,4-triazoline-5-thiones) Ⅲ were obtained in good yields (42.7%～96.2%) through the cyclization of the compounds Ⅱ with 1 mol/L K
2
CO
3
solutionThe structures of compounds Ⅱ and Ⅲ were characterized by elemental analysis, IR,
1
H NMR and MS. Antibacterial activity tests of these compounds against BSubtills and EColi show that compounds Ⅱ
d-h
, Ⅲ
d-h
, are the most effective species.
Studies on N-Isopropyl-S-Propyl-N'-Substituent-N'-Benzenesulfonyl Phosphorothlodiamidoates
LAI Peng-xiang, WANG Hui-lin, CHEN Ru-yu, LIU An-xi, XU Jian-hua
1992, 13(2): 191-194.
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Twenty new N-isopropyl-S-propyl-N'-substitutent-N '-benzene sulfonyl phospho-rothiodiamidoates Ⅰ,Ⅱ were synthesized; a cyclo phosphorodiamidoates (Ⅲ) formed as the byproduct during the reaction; their structures were confirmed by
1
H NMR, elemental analysis or MS, the preliminary bioassay shows that these new compounds have a remarkable insecticidal ac-tivitives.
Research on the Oxidation of Adrenaline —— Research on the Formation and Further Oxidation of Adrenochrome
ZHANG Yi-bao, DAI Jian-bo, JIANG Dong-qing, ZANG Fa-yi, GU Zhuo-ying, ZANG Ya-ru, ZHAO Xue-zhuang
1992, 13(2): 195-199.
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Using the ultra-violet absorption spectrometry in connection with the computer simulation, the oxidation reaction kinetics of adrenaline and adrenochrome formed with H
2
O
2
in Cu (Ⅱ) existing as a catalyst has been studiedThe change of reaction rates as regard to the formation and oxidation of adrenochrome with the change of the initial concentrations of adrenaline, Cu (Ⅱ) and H
2
O
2
has been examined, tooFor this reaction, there may be two consecutive steps-Adrenaline→Adrenochrome→other productsThe kinetic laws of these two steps are 05order and first order for adrenline and for adrenochrome, respectively.
The Synthesis of Crown Ethers (ⅩⅨ)——Synthesis of Dihydroxy Crown Ethers Derivatives
WANG Yu-ting, HUANG Zai-fu, SHI Jian-peng, LIN Yuan
1992, 13(2): 200-203.
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The dihydroxy crown ehters (Ⅰ,Ⅱ) were treated with 3-bromo-acetic acid, 3-bro-mo-propionic acid and chloroacetyl chloride respectively to give the corresponding dicarboxylic acids(3,4,5,6) and chloroacetate (1,2)In addition, two new dihydroxy crown ethers (Ⅲ ,Ⅳ) were prepared by the reaction of 1, 1'-(o-phenyl)-bis-(2,3-epoxypropyl)ether with 2,2'-diphe-nolBy treating Ⅲ and Ⅳ with bromo-acetic acid the corresponding dicarboxylic acids(7, 8) were obtainedThe structures of the ten new compounds were determined by elemental analysis, IR,
1
H NMR, and MS.
Studies of Caged Bicyclic Phosphates(Ⅴ)——Synthesis of 1-Oxo-1-Phospha-2,6,7-Trioxabicyclo[2,2,2]-4-Substituted Carbonyl Octane
LI Yu-gui, LI Jian-min, REN Hai-lan, CHEN Li
1992, 13(2): 204-208.
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Caged bicyclic phosphates would be a new type of pesticides because of their unusual mode of bioaction Also they would be widely used as fire-proofing agents, resin-stabilizers and oil-adductsAs a part of our continuing investigation, other thirteen new derivatives of bicyclic phosphate 4a-n were synthesized by the reaction of 1-oxo-1-phospha-2, 6,7-trioxabicyclo[2,2,2]-4-chlorocarbonyl octane 3 with mercaptans, ethanolamine, ethylene amine, and heterocyclic compoundsAll the compounds were confirmed by elemental analysis, IR and
1
H NMR Through studying the spectra of compound 4
j
, we infered its possible structureThe MSspectra of some compounds were discussedIt is indicated that higher thioesters have the same bi-rear-rangement as usual estersThe preliminary biological tests show that compound 4
j
has a bactericidal activity.
AlkyI Perfluoroacyloxyl Nitroxides ——EPR Studies on SET Reactions Between Perfluorodiacyl Peroxides and Aliphatic Amines
ZHAO Cheng-xue, QU Yan-ling, PENG Yi-yuan
1992, 13(2): 209-213.
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Perfluorodiacyl peroxides, (RFCO
2
)
2
[R
2
= n-C
3
F
7
, n-C
7
F
15
and H(CF
2
)
4
], oxidize secondary aliphatic amines into bis-alkyl nitroxides, RN (O
·
)R, which are stable in F113 (CClF
2
-CCl
2
F) solutions at roon temperatureIn one-electron oxidation reactions of the primary amines, RNH
2
(R = primary, secondary, as well as tertiary, such as t-butyl) with (RFCO
2
)
2
under the similar conditions, alkyl perfluoroacyloxyl nitroxides RN(O
·
)OCOR
F
, are always formed and detected by EPRIn the case of t-butyl amine, four more nitroxides of quite different life times, RN(O
·
)R, RN(O
·
)H, RN(O
·
)RFand RN(O
·
)R
F′
(R
F′
=R
F
-CF
2
), are observedOur EPRand product studies have revealed the dependence of the reaction patterns on the nature of the Rgroups, of the one-electron oxidation of the primary amines.
The Determination of Equilibrium Constants of Liposoluble Derivatives of Vitamin C and Nitroxides in Micelles
LIU You-cheng, HAN Zheng-xu, LIU Zhong-li
1992, 13(2): 214-216.
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In this paper the determination of equilibrium constants between piperidine nitroxides and vitamin Cand its derivatives in SDSand CTABmicelles is reportedIt was found that the magnitude of binding constants of the substrate with micelles is related not only to the lipophilici-ty of the substrate but also, under certain circumstances, to the electrostatic interaction between the substrate and the micellesThese results provide the rationale for the discussion on relevant kinetic studies in micellar systems.
Studies on the Valence State of Tb Ion in Eu
1-x
Tb
x
Ba
2
Cu
3
O
7-δ
LI Li-ping, WEI Quan, WANG Yi-feng, LIU Hong-jian, HUANG Chang-lie, WANG Chun-lei, LI Fan, SU Wen-hui
1992, 13(2): 217-220.
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In this paper, the Tb
4d
photoelectron spectra in compounds of BaTbO
3
, Tb
4
O
7
and TbFeO
3
were measured, and the characteristic levels of Tb
3+
and Tb
4+
were found to be 149.45 and 156.20 eVrespectivelyThe relationship between the intensity ratio (I) of the higher binding energy peak to the lower one and the content of Tb
4+
/Tb(z) is obtained for the first time, I= -0.98z
2
+2.15z(0≤z≤1), which can be used to determine the valence state of Tb ion in the "123" phase of Eu
1-x
Tb
x
Ba
2
Cu
3
O
7-δ
By normal sintering method at atmosphere and high temperature, the pure "123" phase Can not be obtained, and it is also difficult to form Eu
1-x
Tb
x
Ba
2
Cu
3
O
7-δ
samples containing pure Tb
3+
In the "123" phase of Eu
1-x
Tb
x
Ba
2
Cu
3
O
7-δ
, the Tb ions are in a mixing valence state of Tb
3+
and Tb
4+
, and when x = 0.3, Tb
4+
/Tb=0.61 The O
2p
hole number in the Cu(2)-O(2) plane is decreased because of doping Tb
4+
, and this may be one of the reasons of destroying the superconductivity.
The Variation of the Acid/Base Properties of Polymer Surface in Diverse Environments
CHEN Ming-hua, SHEN Jian, RUI Li, YANG Cheng, HUANG Yuan-fu
1992, 13(2): 221-223.
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In this paper, by using the method for measuring contact angles assisted by analysing the surface component with XPS, the variation of the acid/base properties for a copolymer (MMA-Co-4Vp) surface formed under various conditions or preconditioned in different media are investigatedMeanwhile, the regularity and the reason of the variation are also investigated.
Interfacial Chemistry and Kinetics-Controlled Reaction Mechanism of Organo-Phosphoric Acid Mixed Extraction Systems
YU Jing-fen, JI Chen
1992, 13(2): 224-226.
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The interfacial chemistry for D2EHPA(Di(2-ethyl-hexyl) phosphoric acid)-M
1
PAor M
2
PA(two monophosphoric acid extractants with a long-chain)-Al
3+
and D2EHPA-MEHPA (mono(2-cthyl hexyl)phosphoric acid)-Al
3+
mixed extraction systems was studiedIt was found that, compared with individual extraction system alone, the mixed extraction systems show a particular advantage improvement in the interfacial characteristics of the systemsThe extraction kinetics and interfacial chemistry study indiate that the process of aluminium extraction by micella mixed extraction system(D2EHPA-M
1
PA) is controlled by the chemical reaction in combination with diffusion, while the controlling reaction occurred inside the micella phase.
Spectroelectrochemical Studies of Enzymes (Ⅰ)——Electrochemical Properties of Horseradish Peroxidase
WU Bao-zhang, WU Hui-huang, ZHOU Shao-min
1992, 13(2): 227-230.
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The redox processes of horseradish peroxidase (HRP) and its compounds were investigated by the thin-layer spectroelectrochemical techniqueIt is shown that the direct electron transfer of the enzyme HRPon the solid electrodes can be carried out and the electrode reaction is the oxidation-state transformation of the central metal ion in prosthetic group heme rather than the reduction of disulfide group in HRPmoleculeThe standard redox potential of HRP(Fe
3+
/ Fe
2+
) couple and electrochemical kinetic parameters were measured, and the electrochemical properties of HRP compound Iwere also discussed.
Prediction of Self-diffusion Coefficients of Molecules in Liquids
CHEN Liu-ping, HAN Shi-jun
1992, 13(2): 231-234.
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On the basis of the layer structure model of liquid, this paper presents an equation for predicting the self-diffusion coefficients of molecules in liquidsThe equation has been tested with 24 liquids in a wide temperature range, with an average deviation of 38% The values of the configuration parameter ξ which varies with the variation of temperatures and different substances were analyzedThis is of great importance for understanding the microstructure of the liquid and the mechanism of the diffusion processes, and for expounding the rationality of the layer structure model.
Conductivity and CO Methanation Activity of LaNiO
3
SHEN Yue-nian, HU Rui-sheng, LIU Xin-hua, HUANG Wen-de, SHENG Shi-shan
1992, 13(2): 235-237.
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In this paper, the single phase of polycrystal perovskite-type oxide, LaNiO
3
, which was prepared by decomposition of nitrates at 800℃, was characterized by X-ray diffractionThe resistivity of LaNiO
3
was measuredIt was found that the resistivity of LaNiO
3
was lower than that of the mixed oxides of La and Ni, but higher than that of metal nickelIt was suggested that LaNiO
3
is a semi-metalThe activity order for catalysing COmethanation is metal nickel> LaNiO
3
>NiO, which corresponds to that of their conductivities and their localized degree of d electrons in nickel atoms or ions.
Kinetic Studies on the Stripping of Uranyl Nitrate in TBP-HNO
3
System
ZHOU Zu-ming, YU Shao-ning, ZHAN Yong-zu
1992, 13(2): 238-241.
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The kinetics of the stripping of UO
2
(NO
3
)
2
in tri-n-butyl phosphate(TBP)-cyclohex-ane with nitric acid solution has been investigated by using constant-interface cell and single drop techniqueUnder the conditions of the constant-interface cell method, the rate of stripping of uranium (VI) increased steadily with the stirring speed and was nearly independent of temperatureThe rate equation was R = k
1
[U]
(o)
[TBP]
(o)
-1.17
[HNO
3
]
-1.70
The rate of stripping might be controlled by the diffusion process of complex UO
2
(NO
3
)
2
·2TBP from the organic, phase to the interfaceIn the case of single drop method, the rate of stripping of uranium (VI) increased with increasing temperature and the apparent activation energy was found to be 278 kJ/molThe rate equation was R = k
2
[U]
(o)
[TBP]
0
(o)
in 3 mol/L HNO
3
. It is suggested that the rate-controlling step might be the dissociation reaction of the complex UO
2
(NO
3
)
2
·2TBP at the interface.
The Correlation of Molecular Structure and Retention Index with the Change of Partial Molar Free Energy(AAAAG) of Pyridine Derivatives ——A New Method of Predicting Retention Index
GONG Jian, GONG Ping
1992, 13(2): 242-245.
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In this paper, we measured the change of partial molar free energy of various pyridine derivatives (△G'or △G function) and its difference (δ(△G')) on capillary column coated with OV-101 and OV-17 The result indicates that the same substituent in different positions of hete-rocyclic ring provides different energiesCalculated by this method, the △G values and the retention index of the unknown are in good agreement with the experimental values, and this calculating method is of greatly practical significance.
Studies on Mechanism of MeOH Decomposition over MgO Catalyst
QIAN Zai-hu, GUO Can-xiong, Naito Shuichi, Tamaru Kenzi
1992, 13(2): 246-248.
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Mechanism of MeOHdecomposition over MgOcatalyst was studied with IRspectra and
13
C isotopic techniquesIt is found that MeOH forms formate ions over MgO at 300℃ ,and then decomposes to CO and H
2
. The decomposition of formate ions becomes the rate controlling step in MeOH decomposition over MgO.
Preparation and Characterization of Heteropoly-Tungstosilicate Dimers
WANG Zhan-wen, WU Nai-jun, FANG Jing-li
1992, 13(2): 249-251.
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Heteropoly anion dimers K
12
(SiMW
11
O
39
)
2
O·29H
2
O(abreviated to (SiMW
11
)
2
O, M = Fe
Ⅲ
, Cr
Ⅲ
, Al
Ⅲ
) were prepared, and characterized by element analysis, IRand UVThe binding energies of M
2p
in anions were determined by XPS The results show that M
2p
binding energies in (SiMWu)
2
O are 0.7～0.9 e Vlower than those in SiMW
11
From the M
2p
binding energies, IRand UV, it is deduced that two heteropoly anions in the dimers are connected by M-O-M, in which 2p orbits of oxo-bridged oxygen may be overlapped with 3d orbits of metal M
Ⅲ
to form dπ-pπ-dπ bondsThe magnetic susceptibility of Fe and Cr in (SiFeW
11
)
2
O and (SiCrW
11
)
2
O are obviously lower than those in SiFeW
11
and SiCrW
11
This means that there is an antimagnetic enchange of d electrons between two M
Ⅲ
through the bridged oxygen.
A New Method for Judging the Phase States of Liquid Crystalline Polymers
ZHU Zhen, WU He-rong, LI Shi-Jin
1992, 13(2): 252-253.
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The phase states of thermotropic liquid crystalline polymers (LCPs) cooled from isotropic melt were analyzed on the basis of thermodynamics and kineticsThe thermal entropy scheme of LCPs on heating and cooling was establishedAnd a new method for judging the phase states of LCPs was proposedThe method was applied to a series of polyesters, and the phase states of the polyesters cooled from isotropic melt were obtained.
Spectroelectrochemistry of Zn(Ⅱ) Tetranitrophthalocyanine Complex
LIU Wei, XU Yi-ming, DING Zi-qing
1992, 13(2): 254-255.
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The electrochemistry of the title complex was studied in DMFWith the use of an optically transparent electrode, the electronic spectra of five different oxidation states were reportedThe redox mechanism and the species on the electrode were also discussed.
Synthesis of Bridge Chain Heptamethine Cyanine Dyes and Their Photo-Properties
YAO Zu-guang, FANG Xi, ZHU Zheng-hua, YE Lin, YANG Xiang-chun
1992, 13(2): 256-258.
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Five heptamethine cyanine dyes containing a diphenylamino group at the meso position in their bridge chain were synthesisedTheir absorption spectra and fluorescence emission spectra were determinedThe lasing properties of these dyes, including the tuning range, the center laser wavelength, and the conversion efficiency were examined with the pump source of the frequency-doubled YAGlaser(532 nm).
The Effect of Promotor Sm
2
O
3
on the Alumina-Supported Nickel Methanation Catalysts
SHENG Yin, MA Fu-tai
1992, 13(2): 259-261.
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In this paper, the effects of adding Sm
2
O
3
on the alumina-supported nickel methana-tion catalysts were investigated by XRD, TEM, XPS and TPSRtechniquesIt was found that the addition of Sm
2
O
3
leads to significant increases both in activities and stabilities, which are more obvious for the catalyst sample prepared by stepwise impregnationThe effects are primarily attributed to the fined and well-distributed crystallite obtained by means of Sm
2
O
3
adding XPS results indicate that Ni
2P
3/2
binding energies for NiO-Sm
2
O
3
/Al
2
O
3
are 1 eVlower than that for NiO/Al
2
O
3
. The interaction of Sm
2
O
3
and Ni can improve the activation absorption of carbon oxide.
A New Kind of "Duckweed" Structure Monolayer and Its Langmuir-Blodgett Films
SHEN Jia-cong, ZHANG Xi, ZHANG Chun-xin, CHA Xiao, ZHAO Xiao-guang, ZHOU En-le
1992, 13(2): 262-265.
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Anew kind of amphiphilic polymer composed of a hydrophobic St-DVB microgel core and several hydrophilic polymethyacrylic acid chains was synthesized via radical initiation polymerization and graftThe behavour of the monolayers was studied by the surface pressrue-area curves and the Y-type of the multilayers of the amphiphilic graft polymer is first built by LBtechniqueIts layer structure was confirmed by X-ray diffraction and TEM, and the thermal stability was discussed.
A Study of Liquid Crystalline Copolymers with Azoxybenzene Mesogens in the Main Chain
LI Zi-fa, ZHANG Zi-yong, WANG Lei, ZHOU Qi-feng
1992, 13(2): 266-269.
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A series of liquid crystalline copolymers with azoxybenzene mesogens were synthesized from 4,4'-dihydroazoxybenzene and 1,10-decamethylene glycol with different weight ratio by the solution polycondensation with an diacid dichlorideBy changing the mesogen content in the copolymer molecules, the phase transformation temperature of the copolymers could be regulated while their liquid crystalline properties were not sacrificed in the range of the selected monomer ratio.
Synthesis of Ligand Exchange Chromatographic Supports with Polyacrylamide Matrix and Its Application to the Separation of Amino Acids
YAN Hu-sheng, CHENG Xiao-hui, HE Bing-lin
1992, 13(2): 270-273.
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The present paper reports the synthesis of chelate resins with hydrophilic polyacry-lamide matrix and ligands which form pentacyclic chelates with cupric ionsThe resins coordinated with Cu
2+
were used as the ligand exchange chromatographic supports for the separation of neutral amino acidsThe chromatographic behaviour was compared with those on the columns packed with other two types of chelate resins in Cu
2+
formSome of the resins synthesized in this paper have the best separation coefficientsThe effect of the chromatographic conditions on the separation was studiedThe mechanism of the separation is discussed.
A Study of Morphology and Properties of HDPE/Zinc-Neutralized Sulfonated EPDM Blends
ZENG Xiang-sheng, LI Hui-lin, XU Xi
1992, 13(2): 274-277.
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The compatibility of zinc-neutralized sulfonated EPDM(Zn-SEPDM) and its effect on crystallizing behavior of high density polyethylene (HOPE) as well as the morphology of the blend were studied via WAXD, DSC, TEM, SEM, a capillary rheometer and mechanical property testsThe results show that the addition of Zn-SEPDM makes both the melting point and the crystallizing temperature of HOPE decreaseAs Zn-SEPDM content exceeded 20%, Zn-SEPDM in the blend became a continuous phase and an abrupt change in impact strength occurred therefromOwing to the incorporation of ionic groups into EPDM, the strong interactions between the chains make the impact strength of HDPE incredibly increased without sacrificing its tensile strength so much.
The Graft Copolymerization on Polymer Surface Initiated by Plasma Irradiation
MA Yu-guang, YANG Mei-lin, WANG Ling-chun, MAO Kun-yuan, SHEN Jia-cong, JIN Yong-ri
1992, 13(2): 278-280.
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A large number of free radicals are produced on the surface of PEto be irradiated by plasma, the ESRmeasurement for this kind of radicals in vacuum showed a five -line spectrum, which can be assigned to the free radical -CH
2
CH
2
·The radical translate to a peroxide free radical as it contacts with air, and to a PMMA free radical as it contacts with monomer MMA The results show that the free radical on the surface of PEto be irradiated by plasma can initiate the graft copolymerization of monomer MMA The graft amount measured by IRspectra increases with postpolymerization time, and reaches as highly as 10% (weight ratio)The stability of the PMMA free radicals, and the dependence of the graft amount on postpolymerization time indicate the graft chain has activity and the free radical in the chain end does not terminate.
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