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Table of Content
24 February 2004, Volume 20 Issue 1
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Articles
Synthesis and Characterizaion of a New Inorganic-organic Sulfate Compound——Crystal Structure of [Ni(H
2
O)
6
][H
2
N(C
2
H
4
)
2
NH
2
](SO
4
)
2
MENG He, XING Yan, FU Yun-long, SHI Zhan, PANG Wen-qin
2004, 20(1): 1-5.
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[Ni(H
2
O)
6
][H
2
N(C
2
H
4
)
2
NH
2
](SO
4
)
2
is an inorganic-organic compound with a new open framework synthesized by hydrothermal method, and characterized by means of single-crystal diffraction and spectroscopic data. The compound crystallized in a monoclinic space group P2
1
/n with a=1.29089(2) nm, b=1.06301(3) nm, c=1.33202(4) nm, β=114.0870(10)°, V=1.67127(8) nm
3
, Z=4, and was solved by using the direct method and the least-squares refinement converged at R=0.0214[I>2σ(I)]. The structure consists of isolated Ni(H
2
O)
6
octahedra and SO
4
tetrahedra, with both of them hydrogen-bonded to piperazine cations.
Studies on Model Interaction of Keggin-type Polyoxometalates with Nucleic Acid
PENG Jun, LI Wen-zhuo, ZHAO Xian-ling, HAN Zhan-gang, HUANG Bai-qu
2004, 20(1): 6-9.
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Keggin anions behave differently from each other when they react with nucleic acids. The molybdenum series exhibits oxidative cleavage activity towards AMP and DNA. The mechanism of AMP damage and DNA cleavage caused by the molybdenum series is mainly oxidation and the oxidation sites are on the ribose parts other than on the adenine parts, while the hydrolysis probably makes significant contributions to the cleavage of DNA and to the damage of AMP caused by the tungsten series.
Hydrothermal Synthesis and Characterization of a Novel Two-dimensional Framework Materials Constructed from Polyoxometalate and Coordination Groups: [H
2
Mo
5.5
V
10.5
O
40
(PO
4
)][Cu(en)
2
]
4
·7H
2
O
CUI Xiao-bing, ZHENG Shou-tian, SUN Yan-qiong, YANG Guo-yu
2004, 20(1): 10-14.
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A novel compound [H
2
Mo
5.5
V
10.5
O
40
(PO
4
)][Cu(en)
2
]
4
·7H
2
O(1) was synthesized from V
2
O
5
, MoO
3
, CuCl
2
·2H
2
O, en, H
3
PO4 and H
2
O in an aqueous solution via the hydrothermal method and characterized by means of single-crystal X-ray diffraction, elemental analyses, IR, EPR spectra and thermal analyses. C
16
H
80
Cu
4
Mo
5.5
N
16
O
51
PV
10.5
crystallized in a triclinic system, the space group is P1 with M=2660.63, a=1.283590(10) nm, b=1.289910(10) nm, c=1.387870(10) nm, V=1.80942(2) nm
3
, Z=2, D
x
=4.883 g/cm
3
, F(000)=2599, μ=6.956 mm
-1
, (Δ/σ)=0.000, S=1.089. The crystal structure was solved by the direct methods with the final R=0.0752 and wR=0.1988 for 6311 observed reflections with I≥2σ(I). The X-ray crystallography reveals that compound 1 is a novel two-dimensional framework material constructed from the mixed Mo/V polyoxometalate and coordination groups.
Assembly and Characterization of Rare-earth-containing Polyoxometalate [Eu(P
2
Mo
17
O
61
)
2
]
17-
and Poly(allylamine hydrochloride) Multilayer Films
JIANG Min, ZHANG Hong, WANG En-bo, KANG Zhen-hui, LIAN Suo-yuan, XU Lin, WU Ai-guo, LI Zhuang
2004, 20(1): 15-19.
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The ultrathin multilayer films of rare-earth-containing polyoxometalate cluster K
17
[Eu(P
2
Mo
17
O
61
)
2
](EuPMo) and poly(allylamine hydrochloride)(PAH) have been prepared by the Layer-by-Layer(LbL) self-assembly method. The photoluminescent behavior of the films investigated at room temperature shows the Eu
3+
characteristic emission pattern of
5
D
0
→
7
F
J
(J=1-4). The occurrence of the photoluminescent activity confirms the potential of creating luminescent multilayer films with polyoxometalates(POMs).
Synthesis and Liquid Crystal Properties of Transition Metal Complexes of Meso-tetra(4-
n
-myristyloxyphenyl) porphyrin
LIU Wei, SHI Yu-hua, SHI Tong-shun
2004, 20(1): 20-23.
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Transition metal complexes of meso-tetra(4-myristyloxyphenyl)porphyrin TMPPM'[M'=Mn, Fe, Co, Ni, Cu, Zn; TMPP=mesotetra(4-myristyloxyphenyl)porphyrin] have been synthesized and characterized by means of elemental analyses, UV-Vis spectra, infrared photoacoustic spectra,
1
H NMR spectra, molar conductance and differential scanning calorimetry(DSC). The ligand and the Zn complex show liquid crystalline behavior. According to the DSC thermogram of the Zn complex, it exhibits a lower phase transition temperature -7.453 ℃ and a wide mesophase temperature span, 77 ℃.
Hydrothermal Synthesis and Crystal Structure of a Microporous Gallophosphate with 12-Membered Ring Channels: Ga
9
(PO
4
)
12
(H
3
TREN)(H
2
TREN)
3
·xH
2
O
CHEN Xiao-bo, LI Yi, LI Guang-hua, DAI Zhi-min, FU Wen-sheng, SHI Zhan, ZHANG Dong, XU Yao-hua, FENG Shou-hua
2004, 20(1): 24-28.
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An open-framework gallophosphate, Ga
9
(PO
4
)
12
(H
3
TREN)(H
2
TREN)
3
·xH
2
O was hydrothermally synthesized at 453 K with tris(2-aminoethyl) amine(TREN) as the organic template and characterized by single-crystal X-ray diffraction. Ga
9
(PO
4
)
12
(H
3
TREN)(H
2
TREN)
3
·xH
2
O·xH
2
O crystallized in a cubic space group
I
43m, with a=1.68552(3) nm and Z=2. The structure contains 12-membered ring channels and supercages of 1.434 nm in diameter, and is an analogue of Al
9
(PO
4
)
12
(C
24
H
91
N
16
)·17H
2
O. Template-TREN in the supercage was different from triethylenetetraamine(TETA) used in the initial reaction mixture due to the construction transformation. The TETAs transformed into the TRENs due to the low interaction energy between the template and framework. We verified it via energy calculation and liquid state NMR.
Investigation of Adsorption Rates of Pb, Cd, Cu, Co and Ni to Fresh-water Surface Coatings Developed in Nanhu Lake
DONG De-ming, ZHANG Jing-jing, LI Yu, ZHANG Jun-zhi, HUA Xiu-yi, YANG Fan
2004, 20(1): 29-31.
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The adsorption kinetics of five heavy metals onto the natural surface coatings, which were collected in the Nanhu Lake in Changchun, Jilin Province, China, were investigated for the purpose of giving some explanations for the mechanisms of heavy metal adsorption onto the surface coatings with initial metal ions of 5 μmol/L. The results show that firstly, the adsorption of heavy metals onto the surface coatings follows the first order kinetics; secondly, the double-constant rate equation is suitable to describing the adsorption of heavy metals selected onto the natural aquatic surface coatings, following the order K
Cu
>K
Pb
>K
Co
>K
Ni
>K
Cd
; thirdly, there is a significant correlation between the adsorption rate and the physical and chemical characteristics of heavy metals, such as E0,
Δf
H
0
m
, and
Δf
G
0
m
based on the linear regression analysis.
Evaluation and Prediction of Joint Toxicity of Aniline and Its Derivatives to
Photobacterium Phosphoreum
YUAN Xing, SU Li-min, SONG Li-li
2004, 20(1): 32-35.
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The single toxicity of aniline and its derivatives and the joint toxicity of the binary mixtures of aniline and each of its derivatives with the toxic unit ratios of 1∶1, 1∶4, 4∶1 to photobacterium phosphoreum were determined, respectively. The toxic unit and the additive index were used to evaluate the joint toxicity. The result shows that the joint toxicity of each of the binary mixtures of aniline and each of its derivatives is mainly simple addition of the toxicities of the two compounds. On this basis, the QSAR equation that was built from the single toxicity of aniline was used to predict the toxicity of the derivatives of aniline in the mixtures. Good agreement between the predicted and experimental values was found with R
2
=0.921.
Studies on Complexation of ATMP, PBTCA, PAA and PMAAA with Ca
2+
in Aqueous Solutions
WEN Rui-mei, DENG Shou-quan, ZHU Zhi-liang, FAN Wei, ZHANG Ya-feng
2004, 20(1): 36-39.
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By means of acid-base potentiometric titration and the advanced BEST computer program developed by Martell et al., the deprotonation constants of four inhibitors[Aminotrimethylenephosphoinic acid(ATMP), 2-phosphino-tutane-1,2,4-tricarboxylic acid(PBTCA), polyacrylic acid(PAA, M
w
＝2000), poly(maleic, acrylic) acid(PMAAA, M
w
＝3000)], and the stability constants of the complexes of these inhibitors with Ca
2+
have been determined. And the distribution curves of ATMP at different pH values in aqueous solutions have also been given out. The result of this study can be applied to explaining the inhibition mechanism.
The First Total Synthesis of 16-Hydroxygeranylgeraniol
PENG Li-zeng, MEI Tian-sheng, ZHANG Tao, ZHANG Feng-zhi, LI Yu-lin
2004, 20(1): 40-41.
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The facile synthesis of 16-hydroxygeranylgeraniol(1), a naturally existing alicyclic diterpene, by alkylation reaction of allylic iodide(3) with phenyl sulfone(4), is described.
An Explosive Organic/Inorganic Hybrid: Synthesis and Thermal Property of Octa(2,4-dinitrophenyl) silsesquioxane
CHEN Hong-Ji
2004, 20(1): 42-45.
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)
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Octaphenylsilsesquioxane(OPhS) was prepared by a modifying method and a new core-shell nanocomposite, octa(2,4-dinitrophenyl)silsesquioxane, [(R
2
PhSiO
1.5
)
8
, R=-NO
2
, ODNPhS], was synthesized by nitration of OPhS in a mixed acid solution of nitric and sulfuric acids at about 60 ℃. Their molecular structures were determined by DRIFTS,
1
H NMR,
13
C NMR spectra analysis. The thermal analysis shows that ODNPhS is an explosive that detonates at about 420 ℃.
Ionic Liquid Solvent Based on Cyclic Guanidinium Cation for Nucleophilic Displacement Reactions
LIN Ying-jie, QIU Zhi-ming, DUAN Hai-feng, LI Sheng-hai, ZHANG Suo-bo
2004, 20(1): 46-49.
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The nucleophilic displacement reaction of n-bromooctane and potassium iodide in ionic liquid based on cyclic guanidinium cation(2) was investigated. The kinetic reasult shows that the rate of the reaction is enhanced in ionic liquid (2). The same reaction in [bmim][PF6](1)(where bmim=1-butyl-3-methylimidazolium) was also studied. It was found that as a reaction medium ionic liquid (2) is better than (1) for nucelophilic displacement reactions.
Directed Evolution of
L
-Aspartase by Mobility of Domains
GOU Xiao-jun, LI Shuang, KONG Xiang-duo, LIU Wei, SUN Yan-hong, ZHANG Jin
2004, 20(1): 50-54.
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To enhance the relative movement of domains, we inserted a random sequence of fifteen-peptide into the three domains of L-aspartase. By means of directed screening, the three isoforms of monomeric, dimmeric and tetrameric enzymes were obtained. Compared to the wild-type tetrameric L-asparease, these mutants remained 19.7%, 42.3%, and 92% of the enzyme activity, respectively. Moreover, the examination of enzyme properties revealed that their kcat and KM changed in varying degrees, and the optimum pH shifted towards acidic pH, while the dependence of the activity of enzyme on Mg
2+
concentration and thermostability increased. Therefore this strategy provides a novel approach to directed evolution of enzymes.
Construction of Hybrid Enzyme from HEC-SOD and Cu,Zn-SOD
GOU Xiao-jun, ZHANG Zhong-hua, LI Shuang, KONG Xiang-duo, SUN Yan-hong, LIU Wei, ZHAGN Jin
2004, 20(1): 55-59.
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)
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Human extracellular superoxide dismutase(hEC-SOD) is a secreted tetrameric protein involved in the protection of a human body from oxygen free radicals. Its three-dimensional structure has not been confirmed. hEC-SOD couldn′t be expressed in E.coli. We constructed a hybrid enzyme, which comprises the N-terminal and C-terminal domains from hEC-SOD, fused it to human Cu,Zn-SOD. The hybrid enzyme is expressed successfully in E.coli. Further, we analyzed the expression of hEC-SOD in E.coli by mRNA differential displaying.
Purification and Characterization of Cold-active α-Amylase Excreted by A Strain of Marine Cold-adaptive
Penicillia
WANG Tian-hong, ZHANG Gang, HOU Yun-hua
2004, 20(1): 60-64.
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The filamentous fungi from the Huanghai sea sludge were screened according to their ability to produce cold-active α-amylase. The strain with the highest amylase activity was identified as Penicillium species. The α-amylase purified by ammonium sulphate precipitation and column chromatography on DEAE-sepharose and sephadex G-100 shows a molecular weight of about 55000 and a pI of 4.38. The enzyme is stable in a pH range of 5.5-8.0 and has a maximum activity at pH 6.0. Compared with the α-amylase from mesophiles and thermophiles, the cold-active enzyme shows a high enzyme activity at lower temperatures and a high sensitivity at temperatures higher than 50 ℃. The optimal temperature is 40 ℃ and the activity decreases dramatically at temperatures above 50 ℃. Ca
2+
shows a significant effect on maintaining the structure and the activity of the enzyme. EDTA and Cu
2+
are its inhibitors. The products from the hydrolysis of soluble starch with the cold-active enzyme are maltose and other oligosaccharides.
Formation Enthalpy Calculation of Oxygen Vacancy Defect in Doped Lithium Niobate Crystals
QIANG Liang-sheng, LI Yao, TANG Dong-yan, XU Chong-quan, WEI Yong-de
2004, 20(1): 65-67.
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The relationship between temperature and oxygen vacancy concentration is deduced in this paper. Based on the data of thermal weight-loss experiment, the formation enthalpies of congruent and several doped LN crystals have been calculated. It was found that the formation enthalpy of oxygen vacancies can be decreased evidently by doping valence-changeable ions. The experimental results were discussed and a new reduction process of the photorefractive LN crystal at a relatively low temperature was proposed, and the reduced crystals showed a good effect in practical use.
Preparation, Characterization and Catalytic Properties of S
2
O
8
2-
/ZrO
2
Supported by Tungsten Carbide
XUE Hua-xin, CHEN Jian-min
2004, 20(1): 68-72.
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A WC-supported S
2
O
8
2-
(PSZ) catalyst was prepared and characterized by means of XRD, BET, FTIR and XPS. The isomerization of n-pentane over the catalyst was investigated as well. The results show that the skeletal isomerization and the crack of n-pentane proceed simultaneously on WC-supported S
2
O
8
2-
/ZrO
2
catalyst. The addition of tungsten carbide showed a significant enhancement in the activity and stability of the catalyst for n-pentane isomerization. The catalyst showed evidently a better activity than S
2
O
8
2-
/ZrO
2
supported by Pt and WO
3
. The results can be interpreted by the existence of the tungsten oxycarbide compound(WC
x
O
y
) with carbidic, oxide and acidic sites.
Kinetics and Mechanism of Dechlorination of o-Chlorophenol by Nanoscale Pd/Fe
WEI Jian-jun, XU Xin-hua, LIU Yong
2004, 20(1): 73-76.
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Nanoscale Pd/Fe bimetallic particles were synthesized with an efficient method to dechlorinate o-chlorophenol. The nanoscale Pd/Fe particles were determined by transmission electron microscopy and BET specific surface area analysis. Most of the particles are in the size range of 20-100 nm. The BET specific surface area of synthesized nanoscale Pd/Fe particles is 12.4 m
2
/g. In contrast, a commercially available fine iron powder(<100 mesh) has a specific surface area of 0.49 m
2
/g. Batch studies demonstrated that the nanoscale particles can effectively dechlorinate o-chlorophenol. The dechlorination reaction takes place on the surface of synthesized nanoscale Pd/Fe bimetallic particles in a pseudo-first order reaction. The surface-area-normalized rate coefficients(k
SA
) are comparable to those reported in the literature for chlorinated ethenes. The observed reaction rate constants(k
obs
) are dominated by the mass fraction of Pd and the mass concentration of the nanoscale Pd/Fe particles.
Syntheses and Application of All-lithium Salts of Heteropolyacid as Electrolyte of Lithium-ion Battery
CHEN Ya-guang, WANG Cun-guo, ZHANG Xi-yan, XIE De-min, WANG Rong-shun
2004, 20(1): 77-80.
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The all-lithium salts of heteropoly acid Li
x
XM
12
O
40
(HPA-Li)(X=P, Si; M=Mo, W) were obtained via ion exchange and characterized by means of IR and UV spectroscopies, TG and elemental analyses. The conductivity of the electrolytic solution consisting of Li
3
PW
12
O
40
and PC/DME mixing solvent(1/2.5, volume ratio) is up to 7.2×10
-2
S/cm, being higher than that of LiClO
4
as the electrolyte. The all-lithium salts were used as electrolytes in secondary lithium-ion batteries. The discharge capacity of the PAS/Li batteries with Li
3
PW
12
O
40
electrolyte solutions reaches to 148 (mA·h)/g and the cyclic life is up to 380 times, much better than those of commercialized products with LiClO
4
and LiAsF6 as electrolytes.
Studies on Reaction Mechanism Between Sparfloxacin and Bovine Serum Albumin
GUO Ming, ZOU Jian-wei, YI Ping-gui, SHANG Zhi-cai, HU Gui-xiang, YU Qing-sen
2004, 20(1): 81-87.
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The binding of sparfloxacin and bovine serum albumin(BSA) in aqueous solution was studied by means of fluorescence and absorbance spectra, and the interactions influenced by Fe
3+
and Cu
2+
were explored. Based on the Scatchard′s site binding model and fluorescence quenching, practical formulas for a small molecule ligand attaching to a bio-macromolecule are proposed. The binding parameters were measured according to the suggested models, and the binding distance, the transfer efficiency of energy between sparfloxacin and BSA were obtained in view of the Frster theory of non-radiation energy transfer. The effect of sparfloxacin on the conformation of BSA was analyzed by means of synchronous fluorescence spectroscopy.
Quantitative Structure-activity Relationships for Anaerobic Biodegradation of Substituted Azobenzenes
ZHANG Xiao-yi, ZHU Huai-wu, LUO Shi-xia, WANG Zheng-wu, XIAO Han
2004, 20(1): 88-91.
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The degradation rates of the azo-bonds of a series of substituted azobenzenes caused by anaerobic sludge digestion were determined by measuring the biggest change of the absorption peak area of the UV-Vis spectra of the anaerobic sludge system before and after degradation. The electronic structure of the molecules was calculated by using the quantum chemistry semiempirical method AM1. The research on the correlation between the biodegradability of the azo-bond and the molecular structure descriptors has led to the following results. (1) There is an obvious relationship between the degradation rate D and the difference Δqπ in π-charge density of the azo-bond. (2) The different substituents in the molecules result in a wave pattern of π-charge distribution and the increasing of the flowability of π-electron. A good flowability of the π-charge favors the reduction between electron contributing azo groups. (3) The effect of the substituents on the π-electron system depends on the electromerization of the substituents in combination with the conjugated systems.
An Investigation of Structure Transition in Sodium Dodecyl Trioxyethylene Sulfate/
n
-Butanol/
n
-Octane/Water System by Dielectric Relaxation Spectroscopy Method
MU Jian-hai, ZHAO Kong-shuang, WEI Su-xiang, LI Ying, LI Gan-zuo
2004, 20(1): 92-98.
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The phase diagram of the quaternary system of sodium dodecyl trioxyethylene sulfate(SDES)/n-butanol/n-octane/water was obtained at (30.0±0.1) ℃. There exists a clear, isotropic, and low-viscosity L phase, which can be divided into W/O, bi-continuous(B.C.) and O/W microemulsions by conductivity measurement results. Dielectric Relaxation Spectroscopy(DRS) measurements, including permittivity, conductivity, relaxation strength, characteristic relaxation time, dielectric parameters, phase parameters, etc., were applied to investigating the microstructures of the system mentioned above. For the samples with a fixed SDES/n-butanol mass ratio of 4/6 including 20%(mass fraction) of n-octane, DRS indicated a structure transition from a W/O to an O/W via a B.C. microemulsion with the increase of the water content. For the samples with a fixed (SDES/20%n-octane)/H
2
O mass ratio of 5/5, DRS presented that there only exists a onefold structure of a W/O microemulsion as the (n-butanol/20%n-octane) content increases. The results obtained from DRS are in good agreement with those from the phase diagram.
OH…O Out-of-Plane Bending Band [γ(OH)] and Its Overtone Band of Dimethylol Propionic Acid(DMPA)
REN Zhi-yong, MA Jian-ming, WU Hai-ping, MA De-zhu
2004, 20(1): 99-102.
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In the present paper are reported the OH…O out-of-plane bending band[γ(OH)] between 900-950 cm
-1
of dimethylol propionic acid(DMPA), its dependence upon temperature and its overtone band investigated via FTIR spectroscopy. It has been found based on the crystal structure that the band [γ(OH)] may not certainly be the characteristic band of carboxylic dimers, it can also result from another H-bond formed between carboxylic carbonyl and the primary hydroxyl. In addition, the band [γ(OH)] is very sensitive to temperature change but its overtone band can only appear at a low temperature.
Electrochemical Behavior of Mitoxantrone and Its Determination at a Pt/C Implanted Modified Microelectrode
QIAN Yong-gui, SUN Zi-jie, HU Jing-bo, LU Yi-qiang, LI Qi-long
2004, 20(1): 103-107.
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In a 0.02 mol/L Na
2
HPO
4
-KH
2
PO
4
(PBS) buffer solution(pH=6.82), the electrochemical behavior of mitoxantrone was studied by linear-sweep voltammetry and cyclic voltammetry at a Pt/C ion implantation modified microelectrode. A sensitive reduction peak was observed. The peak potential was -0.72 V(vs.SCE), the peak current was proportional to the concentration of mitoxantrone within the ranges of 7.0×10
-8
-9.0×10
-7
mol/L and 1.0×10
-6
-2.4×10
-5
mol/L, with a detection limit of 4.0×10
-8
mol/L. The linear correlation coefficients were 0.9994 and 0.9992, respectively. This method has been applied to the direct determination of mitoxantrone in simulated urine. The recoveries were in the range from 96.2% to 105.9%. The reduction process was a quasi-reversible one with adsorptive characteristics at the Pt/C microelectrode. The electrode reaction rate constant ks and the electron transfer coefficient α of the system were determined to be 4.5 and 0.65 s
-1
, respectively. The experiments showed that Pt element had surely been implanted into the surface of the carbon fiber, and the atomic Pt improved the electrocatalytic activity. The Pt/C microelectrode had a good stability and reproducibility.
Analysis on Band Gaps of MCM-41 Type of Materials
HAN Pei-de, LIANG Jian, XU Bing-she, LIU Xu-guang, PENG Lian-mao
2004, 20(1): 108-110.
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The concept and analysis method of photonic crystals and band gaps are introduced into one-dimensional(1D) ordered mesoporous materials. MCM-41 type of materials are treated theoretically as photonic crystals. The formation of band gaps is exhibited and confirmed by a calculation of transfer matrix technique. PBG was found around 9-42 nm in soft X-ray region. The photonic band-gap was predicted to be dependent on incident direction, pore size and lattice constant. The mesoporous materials with different pore sizes and different lattice constants have different band-gap widths.
Dynamically Photocrosslinking of Polypropylene/EPDM Blends as a Thermoplastic Elastomer
WANG Wei-zhi, WU Qiang-hua, QU Bao-jun
2004, 20(1): 111-113.
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The mechanical properties and the crystal morphological structures of the dynamically photocrosslinked polypropylene(PP)/ethylene-propylene-diene terpolymer(EPDM) blends have been studied by means of mechanical tests, wide-angle X-ray diffraction(WAXD), and differential scanning calorimetry(DSC). The dynamically photocrosslinking of the PP/EPDM blends can improve the mechanical properties considerably, especially the notched Izod impact strength at low temperatures. The data obtained from the mechanical tests show that the notched Izod impact strength of the dynamically photocrosslinked sample with 30% EPDM at -20 ℃ is about six times that of the uncrosslinked sample with the same EPDM component. The results from the gel content, the results of WAXD, and the DSC measurements reveal the enhanced mechanism of the impact strength for the dynamically photocrosslinked PP/EPDM blends as follows: (1) There exists the crosslinking of the EPDM phase in the photocrosslinked PP/EPDM blends; (2) The β-type crystal structure of PP is formed and the content of α-type crystal decreases with increasing the EPDM component; (3) The graft copolymer of PP-g-EPDM is formed at the interface between the PP and EPDM components. All the above changes of the crystal morphological structures are favorable for increasing the compatibility and enhancing the toughness of the PP/EPDM blends at low temperatures.
Photoluminescence and Electroluminescence Properties of 2,5-Bis[2,2′-bis(5-phenyl)-1,3,4-oxadiazole] Thiophene(T-OXD)and T-OXD/Poly(9-vinylcarbazole) Blends
ZHANG Zhi-ming, MA Yu-guang, LI Guo-wen, SHEN Jia-cong
2004, 20(1): 114-117.
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The photoluminescence(PL) and the electroluminescence(EL) properties of a novel organic compound, 2,5-bis(2,2′-bis(5-phenyl)-1,3,4-oxadiazole(T-OXD), were studied in chloroform and in a solid thin film. The PL and the EL properties of T-OXD/poly(9-vinylcarbazole)(PVK) blends were also studied, which contained various contents of T-OXD. The PL maximum emission peaks of T-OXD/PVK blends show gradual bathochromtic-shift with the increase of the T-OXD content. The EL spectra of T-OXD/PVK devices are similar to their PL spectra, and all the EL maximum emission peaks show bathochromtic-shift compared with the corresponding PL spectra, which is ascribed to the formation of electroplex. The turn-on voltages for ITO/T-OXD:PVK/Al devices decreased from 13.5 V of the device cotaining 0.1% T-OXD(mass fraction) to 5 V of the device containing 5% T-OXD, which suggests that T-OXD improves the energy level match between T-OXD and PVK and enhances the emission efficiency. The experimental results indicate that T-OXD can be used as a good electron transporting material.
Syntheses and Photo-electronic Properties of Lanthanide Acetylacetonate Benzoporphyrins
QI Ming-hui, LIU Guo-fa, SHI Tong-shun, XU Jin-jie, WANG De-jun
2004, 20(1): 118-120.
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A New Method for Preparation and Characterization of Lipo-alkaloid
WANG Yong, XU Qing-xuan, SONG Feng-rui, LIU Zhi-qiang, LIU Shu-ying
2004, 20(1): 121-123.
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A simple route for the preparation of lipo-alkaloid is presented. When aconitine or one of its analogues is heated with a fatty acid for 20 min at 100 ℃ in water, the C8 acetyl group of aconitine is displaced by a long chain fatty acyl group. The structures of the products were characterized by electrospray ionization tandem mass spectrometry.
Synthesis and Biological Activity of N-Dichloroacetyl-3-methyl-2-n-propyl-1-oxa-4-aza-spiro-4,5-decane
FU Ying, YE Fei
2004, 20(1): 124-126.
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