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Table of Content
24 August 2002, Volume 18 Issue 3
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Articles
A New Orthorhombic Phase of ZrW
1.6
Mo
0.4
O
8
at Ambient Pressure
ZHAO Xin-hua, WANG Qi, MA Hui
2002, 18(3): 233-236.
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Nanocrystallite δ′-ZrW
1.6
Mo
0.4
O
8
was prepared in the precursor route synthesis. The characterization by means of powder X-ray diffraction (XRD) and selected area electron diffraction (SAED) showed it crystallized in a orthorhombic crystal system with a=0.896 9(7) nm, b=0.701 1(8) nm, c=0.596(1) nm. The possible space group is Pnnm (58) or Pnn2 (34). The compound crystallizes in a metastable phase during the synthesis process depending on temperature and crystallization time.
Synthesis and Structural Determination of Binuclear Nine-Coordinate K
4
[Y
2
(Httha)
2
]·14H
2
O
WANG Jun, ZHANG Xiang-dong, MA Rui
2002, 18(3): 237-241.
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A Y
3+
complex with triethylenetetraaminehexaacetic acid was prepared and its composition and structure were determined as K
4
[Y
2
(Httha)
2
]·14H
2
O by elemental analysis and single-crystal X-ray four circle diffraction analysis. In the binuclear complex, the two YN
3
O
6
parts all form nine-coordinate monocapped square anti prismatic structures. There are a lot of water molecules in the unit cell which form hydrogen bonds.
Studies on the Surface Properties of MCM-41
HE Jing, DUAN Xue, EVANS D. G., LI Cheng-yue
2002, 18(3): 242-245.
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MCM-41 materials with a well-ordered long-range structure, a large pore size and a high surface area have been synthesized. Their surface properties including the number and the nature of the surface hydroxyl groups and surface hydrophobicity/hydrophilicity have been investigated by means of 29Si MAS NMR and FT-IR spectra and TPD of probe molecules. The results clearly show that the surface of MCM-41 has an abundance of acidic silanol groups, and that the hydrophobicity/hydrophilicity can be modified by the introduction of Al and transition metals Ti, Cr, Ni and Fe into it.
Effect of Glucose-lowering of Heteropolytungstogermanate β-K
6
H[GeW
9
V
3
O
40
]·9H
2
O
LIU Jing-fu, LIU Ju-tao, MA Jian-fang, CHEN Ya-guang, LI Cai
2002, 18(3): 246-248.
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Preliminary tests in rats have shown that the title complex is an efficient insulin mimic, which may be the first example of polyoxomatalates possessing insulin-mimetic activity.
Crystal Structure of a Novel Supramolecule Made Up of Bis(μ
2
-aqua)aqua(3-carboxy acrylate) monosodium(Ⅰ)
YUAN Ji-xin, HU Mao-lin, CHEN Di-mei, CHEN Li-chun
2002, 18(3): 249-251.
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The title compound, bis(μ
2
-aqua)(aqua)(3-carboxy acrylate) monosodium(Ⅰ), was synthesized in an ethanol-water solution and its crystal structure was determined by means of X-ray diffraction. The crystal is triclinic, space group P1 with the cell parameters a=0.592 4(2) nm, b=0.635 7(3) nm, c=1.117 7(6) nm, α=104.18°, β=91.53°, γ=100.19°, V=0.400 6(3) nm
3
, Z=2, the final R value is 0.033 5. The supramolecule is made up of coordination chains, which are further extended into a three-dimensional network via the hydrogen bonding interactions.
Hydrothermal Synthesis and Structure of [CH
3
NH
3
]
2
[(V
Ⅳ
O)
2
(V
Ⅴ
O
4
)
2
]:A New Layered Mixed-valence Vanadium Oxide Incorporated with Organic Cations
ZHANG Hong, LI Yang-guang, LAN Yang, WANG Xiu-li, Duan Li-ying, WANG En-bo, HU Chang-wen, YAO Yuan-gen, CHEN Jiu-tong, QIN Ye-yan
2002, 18(3): 252-254.
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A new layered mixed-valence vanadium oxide, [CH
3
NH
3
]
2
[(V
Ⅳ
O)
2
(V
Ⅴ
O
4
)
2
], which contains interlamellar organic cations was prepared under hydrothermal conditions and its single-crystal structure was determined. It crystallizes in a triclinic system with space group P1, a=0.625 59(8) nm, b=0.639 84(9) nm, c=0.747 19(10) nm, α=78.718(2)°, β=80.099(2)°, γ=77.100(2). The compound contains mixed-valence V
4+
/V
5+
vanadium oxide layers constructed from VO
4
tetrahedra, pairs of edge-sharing VO
5
square pyramid and methylamine with protonated organic amines occupying the interlayer space.
Preparation of c-Axis Oriented LiNb
1-x
Ta
x
O
3
Films on Si(111) Substrates by a Modified Sol-gel Process
QIANG Liang-sheng, FU Hong-gang
2002, 18(3): 255-257.
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In this work, we succeeded in the preparation of LiNb
1-x
Ta
x
O
3
films on Si(111) substrates by means of sol-gel process, and the usual sol-gel process for the preparation of LiNbO
3
and LiTaO
3
films on Si substrates was improved by adding a 33% aqueous solution of CH
3
CH
2
OH to the mixed sols of LiNb(OCH
2
CH
3
)
6
and LiTa(OCH
2
CH
3
)
6
. The crystallization behavior of LiNb
1-x
Ta
x
O
3
films on Si(111) substrates has been studied. Highly c-axis oriented LiNb
1-x
Ta
x
O
3
films have been obtained within the tantalum composition range of 0<x<0.33. Some factors such as the hydrogen termination of the silicon surface, the RTP annealing process that provides the unidirectional heat flow and the preheating temperature are discussed to analyze the crystallization of the c-axis oriented films.
QSAR Studies on the Toxicity of Nitrobenzenes to Population Growth of
Tetrahymena Pyriformis
Berger S., XU Jing-bo, JING Ti-song, Pauli W.
2002, 18(3): 258-261.
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The IGC
50
(50% inhibitory growth concentration) values of 27 nitrobenzenes were determined for the population growth endpoint of Tetrahymena pyriformis. The toxicity order of the observed compounds was found to be as follows: dinitro compounds>mononitro compounds, dichloronitrobenzenes>monochloronitrobenzenes, meta-substituted nitrobenzenes>ortho-/para-substituted nitrobenzenes(NT, NPh, NAnis) except for the dinitrobenzenes and nitroanilines(DNB, NAn). Quantitative structure activity relationships(QSARs) were developed with the logarithm of the reciprocal of IGC
50
[lg(IGC
50
)
-1
] in mole liter as dependent variable and six molecular descriptors lgP,
1
X
Ⅴ
, I,
1
K
a
, ∑σ
-
and E
LUMO
as independent variables. Via multiple regression analysis, one best equation was obtained:lg(IGC
50
)
-1
＝3.029+0.860∑σ
-
+0.341In＝27, r＝0.924, r
2
=0.854, s=0.265, f=70.44, Pr>f=0.000 1The equation was used to estimate IGC
50
for five analogues.
Anodic-Cathodic Electrocatalytic Degradation of Phenol with Oxygen Sparged in the Presence of Iron(Ⅱ)
ZHOU Ming-hua, WU Zu-cheng, XUAN Xiao-dong
2002, 18(3): 262-266.
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Under oxygen sparged, the synergetic effects of both anodic-cathodic electrocatalysis(ACE) and ferrous ion catalyzed anodic-cathodic electrocatalysis(FeACE) on phenol degradation were observed in an undivided cell composed of a β-PbO
2
anode modified with fluorine resin and a nickel-chromium-titanium alloy net cathode. Oxygen sparging rate, ferrous concentration, and current significantly affect phenol destruction. The phenol was removed by 10%-13% increasingly under FeACE vs. ACE, and by 12%-15% under ACE vs. anodic electrocatalysis(AE). The phenol destruction was due to the formation of hydroxyl oxidant on the surface of lead oxide at the anode and the reduction of oxygen at the cathode.
Studies on Interaction Between Gallocyanine and DNA
ZHANG Gui-zhu, LU Ji-xin, WANG Yue-mei, HE Xi-wen
2002, 18(3): 267-269.
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The interaction of Gallocyanine(Gal) with DNA was studied by using UV spectra and circular dichroism(CD) spectrum methods. Gal and DNA strongly interacted on each other in acid solutions. The intrinsic binding constant(K) and the binding numbers(C
DNA
/C
gal
) of Gal and DNA are 2.25×10
4
mol
-1
and 2.5, respectively. The influence of pH on the interaction of Gal and DNA was also studied.
Anomalous Emission And Carrier Effect of Fresh Porous Silicon
ZOU Bing-suo, WU Zhen-yu, CAO Li, DAI Jian-hua, XIE Si-shen, WANG Jian-ping, Mostafa A. El-Sayed
2002, 18(3): 270-273.
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The emission and Fourier transformation infrared spectra of freshly prepared porous silicon(PS) and the silicon wafer were examined. Increasing temperature generally led to a decrease in the emission intensities of the PS samples, however, the freshly prepared sample showed an unusually large and sudden increase in its emission intensity at the specific temperature at which the hydrogen ion conductivity in the silicon wafer increased. The O-H vibrations of the silicon wafer also showed a sudden decrease at the same temperature. These results are consistent with the assumption that the luminescence of fresh PS comes from the carrier-bound exciton in its confined nanostructure.
Analysis of Effective Composition of
Hippophae Rhamnoides L.
JIN Xiang-jun, LUO Xu-yang, WANG Ying, LIU Zai-qun, ZHANG Jing-wen, SUN Yun-xiu
2002, 18(3): 274-276.
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The vitamin E, proteins, amino-acids, sugar, trace elements and fatty acids in the oil of Hippophae Rhamnoides L. seeds were quantitatively analyzed. Several methods for analyzing vitamin E were compared with each other and the content of gossypol in the oil was first determined.
Synthesis of Trihydrocarbyltin Chloride Containing Silicon and Crystal Structure of (p-Cl-C
6
H
4
Me
2
SiCH
2
)
3
SnCl
ZHONG Gui-yun, LIU Hua, XIE Qing-lan
2002, 18(3): 277-279.
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A series of trihydrocarbyltin chlorides containing silicon was synthesized. The acaricidal activity was determined and the structure-activity relationship was tried to be found out with the hydrophobic parameter.
Preparation and Spectral Characterization of 3-Benzyl-6-aryl-1,2,4-triazolo[3,4-b][1,3,4]thiadiazoles
ZHANG Li-xue, ZHANG An-jiang, CHEN Guang, CHEN Fei-yu, JIANG Yi-ping, ZHANG Zi-yi
2002, 18(3): 280-283.
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3-Benzyl-4-amino-5-mercapto-1,2,4-triazole reacted with aromatic acids in the presence of phosphorus oxychloride, yielding a series of new compounds, i.e., 3-benzyl-6-aryl-1,2,4-triazolo[3,4-b][1,3,4]thiadiazoles, each of which has an active methylene at 3-position. The structures of all the title compounds were confirmed by elementary analysis, IR,
1
H NMR and
13
C NMR spectra.
Studies on Synthesis and Biological Activities of Novel Triazole Compounds Containing 1,3-Dioxolane
XU Liangz-hong, ZHANG Shu-sheng, LI Hui-jing, JIAO Kui
2002, 18(3): 284-286.
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Nine title compounds were synthesized. Their strucures were identified by means of IR, EA,
1
H NMR and MS. The results from the primary biological test show that all the compounds have some activitiies of fungicide and plant growth regulator. When R group is 2,4-Cl
2
C
6
H
3
, compound 2 or compound 4 shows better biological activities.
Antioxidative Effect of Schiff Bases with o-Hydroxybenzylidene Groupon Free Radical Induced Hemolysis of Human Red Blood Cell
LUO Xu-yang, ZHAO Jian-zhang, LIN Ying-jie, LIU Zai-qun
2002, 18(3): 287-289.
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The hemolysis of human red blood cells was initiated by a water-soluble free radical initiator, 2,2′-azobis-(2-amidinopropane hydrochloride)(AAPH), at 37 ℃ in phosphate buffered saline(pH=7.4). The respective addition of 1-[N-(o-hydroxybenzylidene)amino]tetradecane(TDCA), 1,2-di[N-(o-hydroxybenzylidene)amino]cyclohexane(DACH), 4-[N-(o-hydroxybenzylidene)amino]benzoic acid(PABA), 4-nitro[N-(o-hydroxybenzylidene)]aniline(APNA) or N-(o-hydroxybenzylidene)aniline(APA) can all prolong the inhibition period of hemolysis, indicating that the above Schiff bases play an antioxidative role in free radical induced hemolysis. It can be concluded that Schiff base with an alkyl group or a conjugated system in the molecule protect red blood cells against free radical induced hemolysis efficiently. This information may be useful for antioxidant drug design.
Cloning of Promoter of Chinese Bean GRP 1.8 Gene and Characterization of Its Function in Transgenic Tobacco Plants
LU Hai, JIANG Xiang-ning, LI Feng-lan, ZENG Qing-yin, LIU Wei, GOU Xiao-jun
2002, 18(3): 290-293.
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In order to learn the expression pattern of GRP1.8(glycine-rich-protein) gene promoter in transgenic plants and to explore its potential application in plant genetic engineering for vascular-specific expression of interested genes, GRP 1.8 promoter was amplified by PCR from Chinese bean genomic DNA. The intermediate vector was constructed by inserting vascular-specific expression promoter of GRP 1.8 gene in vector pBI 101. The regenerated tobacco plants obtained were analyzed by PCR to select the putative transgenic plants. The histochemical localization of GUS(β-D-glucosidase) activity indicates that as for that of GRP 1.8 promoter we can confer the vascular-specific expression of GUS gene.
Directed Evolution of Human Cu,Zn-SOD Under Artificial Oxidant Pressures
GOU Xiao-jun, LI Chun-lei, KONG Xiang-duo, ZHU Shi-zhen, ZHANG Hong-ying, WANG Xiao-ping, ZHANG Jin, LIU Tian-yun
2002, 18(3): 294-298.
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Cu,Zn-SOD is a highly conserved enzyme and the controversy about its evolutionary possibility in the near future has been lively. In order to further our understanding of the future fate of human Cu,Zn-SOD, we adopted a strategy relating to the directed evolution to study how the mutants of human Cu,Zn-SOD respond to different oxidative stress. After five rounds of screening, we found a mutant that can survive under harsh pressures and DNA sequencing proves that it shows a mutation responsible for the phenomenon. However, under natural pressure, our screening comes to nothing. Then we may draw the following conclusions: the evolution of biological macromolecules in some respect depends on their surroundings and if they are too familiar with a certain environment, they may embody evolutionary inertia.
Preparation and Anti-oxidative Effects of Corn Peptides
XU Li, ZHANG Xue-zhong, GUO Yi, REN Qiao, WU Xiao-xia
2002, 18(3): 299-302.
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Corn peptides(CP) were prepared from zein via proteolysis by means of a type of alkaline protease, Alcalase, at 50 ℃ and pH 8.0. The anti-oxidative activity of the hydrolysate was examined. It was found that the anti-oxidative activity reached the maximum at the fourth hour of the hydrolysis and then decreased. The effect of the enzyme dosage on the solubility of corn protein, the dependence of hydrolysis time on the degree of the hydrolysis(DH) and molecular weight distribution were examined respectively. 30% DH was controlled on the basis of anti-oxidative activity. The hydrolysate was fractionated on a Sephadex G-15 column. The anti-oxidative activities were examined for all the fractions. The main fraction for anti-oxidative activity was collected and characterized by the methods of amino acid analysis, the measurement of average chain length and etc.. The main M
W
distribution of the main fraction was 300-600 Daltons. The anti-oxidative properties of the small peptides in vitro were studied. It was found that they could inhibit the auto-oxidation of pyrogallol and the oxidation of hemoglobin. The hemolysis degree of erythrocyte caused by hydroxyl free radicals was decreased greatly, indicating a protective effect of the anti-oxidative peptides on the cell membrane damage of erythrocyte.
Biosynthesis of Unsaturated Fatty Acids
via Mortierella Isabellina
Cultivated in a Medium Containing Butanol
XIAN Mo, YAN Ji-chang, CHENG Tie-xin, KANG Yi-jian, LI Wen-xing, BI Ying-li, ZHEN Kai-ji
2002, 18(3): 303-306.
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Mortierella isabellina was found to accumulate large amounts of unsaturated fatty acids when it was grown in a medium containing butanol(5 g/L) and yeast extract(10 g/L) and cultivated at 25 ℃ for 5 d during which additional feeding butanol of 2 g/L was fed after being cultivated for 48 h. The resultant mycelial lipids accounted for 40.1% of the dry mycelia, while about 34% of butanol in the medium was converted. The mycelial lipids contained four kinds of unsaturated fatty acids, i.e., palmitoleic(4.9%), oleic(54.1%), linoleic(10.4%) and linolenic(5.4%) acids. Those accounted for 74.8% of the total fatty acids. The effects of the culture conditions, such as cultivation temperature, initial pH of the medium and additional feeding butanol in the course of cultivation, on the production of mycelial lipids by M. isabellina were studied.
Hydrogenation of Olefins Catalyzed by Highly Active Titanocene/NaH or n-BuLi Catalyst Systems
SUN Qi, SUN Ren-an
2002, 18(3): 307-310.
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The effects of the substituents on the cyclopentadienyl ring and the reducing agents on the catalytic activity and the stability of titanocene/NaH or n-BuLi systems for the hydrogenation of olefins were investigated. For the catalyst systems composed of titanocene/NaH or n-BuLi, the nature and the number of the substituents on the cyclopentadienyl ring control the catalytic behavior of those two systems. The effect of the reducing agent on the catalytic activity is relatively small. In addition, the characters of the hydrogenation of various olefins catalyzed respectively by Cp
2
TiCl
2
/NaH or n-BuLi systems were compared.
Direct Immobilization of Phosphine-Rhodium Complex on MCM-41 for Propene Hydroformylation
CAI Yang, LI Zhi-hua, YANG Yi-quan, YUAN You-zhu
2002, 18(3): 311-315.
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MCM-41 molecular sieve supported Rh-PPH
3
catalysts were prepared by the in-situ assembling of the metal complex from smaller moieties of Rh(acac)(CO)
2
and ligand of PPH
3
. The resulted guest/host materials(Rh-PPH
3
/MCM-41) were characterized by X-ray powder diffraction, FTIR and
31
P(
1
H) NMR, and served as catalysts for propene hydroformylation. The results showed negligible change in MCM-41 framework after propene hydroformylation at 393 K. Higher hydroformylation activities were obtained on Rh-PPH
3
/MCM-41 catalysts compared to that on Rh-PPH
3
/SiO
2
.
Determination of Trace Thiocyanate by a Chitosan-Modified Glassy Carbon Electrode
LU Guang-han, YAO Xin, ZHOU Xiang-chun, ZHAN Tong, LONG De-wu
2002, 18(3): 316-320.
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A chitosan-modified glassy carbon electrode(CMGCE) was employed for the determination of thiocyanate. The measurement was carried out by means of anodic stripping voltammetry. The effects of several experimental parameters, such as pH, the amount of modifier, deposition potential and deposition time were studied for analytical application, respectively. A liner response was obtained in the concentration range of 3.5×10
-8
-9.3×10
-7
g/mL of SCN
-
. The detection limit was found to be 1.9×10
-8
g/mL. The method was satisfactorily used to detect SCN
-
in saliva.
The Influence of Temperature on Ethene Diffusion in H[Al]ZSM-5 Studied by Molecular Dynamics
FAN Jian-fen, XIA Qi-ying, GONG Xue-dong, XIAO He-ming
2002, 18(3): 321-324.
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Molecular dynamics(MD) simulation of ethene diffusion in the lattice of H[Al]ZSM-5 was performed at the temperature ranging from 300 K to 700 K. The calculated diffusion coefficients increase with the temperature from 2.60×10
-9
m
2
/s at 300 K to 12.78×10
-9
m
2
/s at 700 K. The Arrhenius plot gives an activation energy of 6.31 kJ/mol. The anisotropy of the diffusion process was examined.
Multifunctional Langmuir-Blodgett film of an Amphiphilic Benziminazole Styryl Dye
ZHENG Jie, LI Fu-you, HUANG Chun-hui, YU An-Chi, ZHAO Xin-Sheng
2002, 18(3): 325-329.
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An amphiphilic benziminazole styryl dye, 2-(4-dihexadecylaminostyryl)benziminazolium TCNQ-(DBTCNQ), was synthesized and successfully transferred onto the substrates by Langmuir-Blodgett(LB) technique. H-aggregates were formed on the substrates. Its monolayer second-order susceptibility[χ
zzz
(2)
=109 p/mV) was determined with a polarized laser beam(Nd∶YAG, λ=1.064 μm). The photoelectrochemistry of the dye LB monolayer films was investigated in a traditional three-electrode cell. The quantum efficiency of photoelectric conversion is 1.08% under favorable conditions [-200 mV, 0.5 mg/mL methylviologen diiodide(MV
2+
) in 0.5 mol/L KCl electrolyte solution]. The experimental data indicate that the LB film exhibits multifunctional properties.
Synthesis of Nicotinic Acid by Potassium Dichromate Oxidation
TIAN Mei, ZHANG Heng-bin, CAO Xue-jing
2002, 18(3): 330-333.
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Nicotinic acid was synthesized from 3-methylpyridine with potassium dichromate as the oxidant. The reaction conditions, the product separation and analysis were studied. The results indicate that under the certain reaction conditions, the yield of nicotinic acid can reach 67.4%, the conversion can reach 99.7% and the selectivity can be as high as 99.8%. The final product has a high purity.
Nanocrystalline Ni(OH)
2
Preparation by Electrolysis in an Aqueous Solution of Nickel Nitrate
ZHANG Heng-bin, LI Xue-yin, CAO Xue-jing, LI Shu-jia
2002, 18(3): 334-336.
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Nanocrystalline Ni(OH)
2
was prepared by cathode deposition in an aqueous solution of nickel nitrate. The structure and the morphology were characterized by means of XRD and TEM. The electrode performances were examined with the materials as a positive electrode in a Ni-MH cell.
Preparation of Porous ZrO
2
and Study on Its Properties
ZHAO Chun, YANG Shao-feng, SONG Li-zhu, XU Hui-fang, YANG Hua, JIANG Fu-ming, WANG Zi-chen, NIU Zhong-guo
2002, 18(3): 337-340.
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The porous zirconia powder with a high surface area was synthesized by means of the ion exchange method from surfactant CTMAB. The highest surface area of the resulted zirconia reached 340 m
2
/g having been calcined at 500 ℃ for 2 h. The influence of preparing conditions on the surface area was investigated. The results show that the amount of the surfactant and the aging time were two main factors affecting the surface area of zirconia. The IR analysis indicated that the large surface area was related to the cations of the surfactant which incorporated into hydrous zirconia by ion exchange.
Oxygen Atom Exchange Mechanism in Reaction of OH Radical with AsO
CHI Yu-juan, YU Hai-tao, FU Hong-gang, HUANG Xu-ri, LI Ze-sheng, SUN Chia-chung
2002, 18(3): 341-344.
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Oxygen atom exchange reaction mechanism in the reaction of OH radicals with AsO was investigated by means of the density functional theory (DFT) with 6-311++G(3df,3pd) and 6-311++G(d,p) basis sets. The calculated results suggest that the reaction between OH and AsO should make the oxygen atoms exchange rapidly because the barrier to isomerization is significantly less than the HO-AsO bond dissociation energy.
A Novel Method for Synthesizing 4,4′-Bis(hydroxymethyl)-2,2′-bipyridine
SU Zhong-min, CHEN Li-hua, WU Li-xin, XU Hong-bin, ZHU Dong-xia, WANG Rong-shun
2002, 18(3): 345-347.
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There are several paths for synthesizing 4,4′-bis(hydroxymethyl)-2,2′-bipyridine, but most of them need strict experimental conditions that are not easy to be overcome. We designed a simple way to prepare this product via the oxidation of 4,4′-bismethyl-2,2′-bipyridine, followed by esterification and reduction. The yield increases and the reaction conditions become genial in contrast to those of other methods. The molecular structure of the final product was confirmed by means of elemental analysis, IR,
1
H NMR and MS spectra.
Substituent Effects on the Hydrogen Bonding Between Phenolate and HF, H
2
O and NH
3
FANG Ying, LIU Lei, GUO Qing-xiang
2002, 18(3): 348-353.
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B3LYP/6-31+g(d) calculations were performed on the hydrogen bonded complexes between substituted phenolates and HF, H
2
O as well as NH
3
. It was found that some properties of the non-covalent complexes, including the interaction energies, donor-acceptor (host-guest) distances, bond lengths, and vibration frequencies, could show well-defined substituent effects. Thus, from the substituent studies we can not only understand the mechanism of a particular non-covalent interaction better, but also easily predict the interaction energies and structures of a particular non-covalent complex, which might otherwise be very hard or resource-consuming to be known. This means that substituent effect is indeed a useful tool to be used in supramolecular chemistry and therefore, many valuable studies remain to be carried out.
Photopolymerization of Dendritic Acrylated Aromatic/Aliphatic Polyesters and Properties of Their Cured Films
XU Gang, LIANG Hong-bo, SHI Wen-fang, BAO Jin-wen
2002, 18(3): 354-357.
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The radiative curable dendritic acrylated aromatic/aliphatic polyesters based on pentaerythritol, 1,2,4-benzenetricaboxylic anhydride and epoxy propane modified with acryloyl chloride were synthesized via a divergent procedure, and their photopolymerization kinetics was studied by photo-differential scanning calorimetry. The mechanical properties and the morphology of the fracture surface of the cured dendritic polyester films were investigated by means of dynamic mechanical thermal analysis and scanning electron microscopy, respectively.
Microstructure Analysis of Nylon 66 by WAXD and SAXS
ZHANG Qing-xin, FU Peng-peng, ZHANG Hong-fang, MO Zhi-shen
2002, 18(3): 358-363.
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The analysis of the small angle X-ray scattering(SAXS) data was based upon particle characteristic function, one-dimensional electron-density correlation function and particle distribution function. The microstructure of nylon 66 with different degrees of crystallinity was studied by means of X-ray scattering method. The radius of gyration R
g
, the Porod radius R
p
, the thickness of crystalline region L
c
, the thickness of non-crystalline region L
a
, the thickness of interphase region d
tr
, the long period L, the semiaxises of particles(a, a, b), the distribution of the particle sizes and the scattering invariant were calculated. The results indicate that there was a significant interphase region between the crystalline region and the non-crystalline region, and its content(W
t,x
) should not be neglected in comparison with that of crystalline region W
c,x
. The morphology of nylon 66 prepared by isothermal crystallization at a high temperature was mainly a lamellar structure, while the spherical crystals dominated in the quenched sample. The size of the particles in the quenched sample was smaller than that of those in the isothermally crystallized sample, and the distribution of the particle sizes in the isothermally crystallized sample was wider.
Effects of Heat Treatment on the Crystallization Behavior of Poly(3-alkylthiophenes)
QIAO Xiu-ying, WANG Xian-hong, NA Tian-hai, MO Zhi-shen
2002, 18(3): 364-366.
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Molecular Modeling of the Chain Structures of Polybenzoxazines
LIU Xin, GU Yi
2002, 18(3): 367-369.
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The structures and properties of benzoxazines were investigated by virtue of molecular modeling at a molecular level. By means of Cerius software(version 4.0) supplied by Molecular Simulations Inc., the molecular mechanics and the molecular dynamics were performed under a PCFF force field. Five kinds of the polymeric chains of benzoxazines were created by using polymer builder and energy minimization. The relaxation process was conducted with both energy minimization and molecular dynamics.
Letters
Synthesis and Structural Characterization of a Novel Sphere Compound of Mo
8
V
2
O
28
·7H
2
O
WANG Li, YE Ling, WANG En-bo, WANG Shu-tao, LU Ying, YUAN Mei, HOU Yu
2002, 18(3): 370-371.
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Research Notes
Halodemetallation of (
Z
)-1-[2-(Triarylstannyl)vinyl]-cyclooctanol and Correlation of Proton Chemical Shift with Electronegativity
REN Yu-jie, YU Li-mei, YANG Xue-feng, CHEN Hui-lin, BAI Ri-xia
2002, 18(3): 372-374.
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)
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