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Table of Content
24 January 1993, Volume 9 Issue 1
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Articles
Synthesis of Large Pore Molecular Sieve VPI-5 by Using Various Organic Amines
YAO Shang-qing, TIAN Wen-tong, QIU Shi-lun, PANG Wen-qin
1993, 9(1): 1-5.
Abstract
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The molecular sieve VPI-5 was synthesized by using various organic amines (DEA, Di-PA, DBA, DPenA, TBA, DEOAand TEOA) as the structure-directing agent. The use of DPAenlarged the range of the crystallization temperature from 110℃ to 190℃ in the synthesis of VPI-5, while the use of TEOAchanged the composition of the reactants in a broad variety. Diamines are the typical amines in the synthesis of VPI-5. Among them DBAand DPAare the most favorite structure-directing agents for the synthesis of VPI-5 molecular sieve.
Syntheses and Structure of Potassium α-and β-Trivanadoenneatungstogermanates
CHEN Ya-guang, QU Lun-yu, PENG Jun, YU Ming
1993, 9(1): 6-12.
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Potassium α-and β-trivanadoenneatungstogermanates were prepared and characterized by means of elemental analysis, IR,
51
V and
183
W NMRspectra and polarography. The single crystal structure of a-isomer was determined. The final Ris 0.083. The results show that two prepared heteropoly anions have Keggin structure, and a-isomer belongs to A-type and has stronger oxidizing ability than β-isomer.
Determination of Standard Molar Enthalpies of Formation for "White Powdery Tungstic Acid" and for Dodecatungstophosphoric Acid by Solution Calorimetry
WANG Ai-ming, CAI Xian-e, ZHU Jing, Gu Yi-dong
1993, 9(1): 13-17.
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"White powdery tungstic acid" has been used for preparing various types of tungsten-containing compounds due to its high reactivity. The present paper covers the standard molar enthalpies of formation, △H
f
0
of three tungsten- containing acids. The values found for "white powdery tungstic acid" WO
3
·1.68H
2
O, "yellow tungstic acid" WO
3
·1.20H
2
O and dodecatungstophosphoric acid H
3
(PW
12
O
40
)·25H
2
O at 298.15K were-(1312±1), -(1192±1) and -(18150±13) kJmol
-1
, respectively.
Separation and Determination of Cobalt, Rhodium, Nickel and Iridium with 2-(6-Methyl-2-Benzothiazolylazo)-5-Diethylamino Phenol by HPLC
LIU Qi-ping, ZHANG Hua-shan, CHENG Jie-ke
1993, 9(1): 18-23.
Abstract
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The synthesis and spectrophotometric properties of 2-(6-methyl-2-benzothiazolylazo)-5-diethylamino phenol (MBTAE), and the use of it as a precolumn derivatizing reagent to separate Co(Ⅱ), Ni(Ⅱ), Rh(Ⅲ) and Ir( Ⅳ) complexes by HPLCare discussed. When the mobile phase consists of methanol/water(90/10Ⅴ/Ⅴ), acetate buffer with pH 4.0 and 5×10
-5
mol/L EDTAsolution, the four complexes Can be separated within
9
min on ODScolumn. The detection limits (20 μLsample size) are 0.059 ppb, 0.062 ppb, 0.053 ppb and 0. 049 ppb for Co(Ⅱ), Rh(Ⅲ), Ni(Ⅱ) and lr(Ⅳ) respectively at a signal-to-noise ratio of 3.
The Evaluation of Two-Dimensional Madelung Constant For NaCl Crystal Structure
HUANG Ke-zhi, HUANG Qing
1993, 9(1): 24-27.
Abstract
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The following documentation is an evaluation of the two-dimensional Madelung constant for the NaCl structure. The infinite series for the structure is formulted as (1993-01-5.png) The first term in the formula converges to 41n2. The series after K =2 in the second term is put together with the third term and a constant -4/√2 is left. The combination of the third term and the series after K=2 in the second term is assumed to be 8 Sn. The converging series Sn can be solved on a computer. The seven significant figures of the two-dimensional Madelung constant for the NaCl structure is then determined as 1. 615558.
Studies on Enantioselective Effect of Chiral Titanate Reagents on the Synthesis of Substituted Benzhydrols
WANG Ji-tao, FAN Xiu-ju, FENG Xiao, LI Yue-ming
1993, 9(1): 28-34.
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Chiral titanate reagents were prepared for inducing asymmetric syntheses of substituted benzhydrols from Grignard reagents and aldehydes. The solvents, reaction temperature and exchange of reactants by crossing experiments were investigated. Favorable attack of the nucleophile upon the aromatic aldehydes' prochiral face was proposed, the absolute configurations of the synthesized benzhydrols were suggested, and a preliminary reaction mechanism was described.
Alkaloid and Isoflavonoid Constituents of Thermopsis Licentiana
JIA Zhong-jian, LIU Zi-min, JIANG De-qiang, SONG Guang-ze
1993, 9(1): 35-39.
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From the whole plant of Thermopsis Licentiana(Leguminoseae), one new compound, 13-β-hydroxylthermopsine, along with eight known compounds, N-methylcytisine, ther-mopsine, daidzein, trifolirhizin, daidzin, genistin, daidzein-4', 7-diglucoside and genistein-4', 7-diglucoside were isolated and identified on the basis of chemical and spectral data.
Studies on Silicon-Containing Fragrance Raw Materials(Ⅲ)——The Addition of
5
-Trimethylsilylcyclohex-3-enone with Grignard Reagent
TANG Shi-xiong, XUE Jie-you, DUAN Mao-sheng, CAO Yu-rong, ZHI Jin-fang, WANG Xiao-Ian
1993, 9(1): 40-44.
Abstract
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The present paper narrates the addition of 5-trimethylsilylcyclohex-3-enone to Grig-nard reagent to give 1-substituted 5-trimethylsilylcyclohex-3-enol in a good yield. The stereochemistry of the addition reaction and their products are discussed.
The Wave Function with Symplectic Symmetry and Its Application
JIANG Xiao-qin, GUO Jin-liang, LI Ze-sheng, LI Bo-fu, SUN Chia-chung
1993, 9(1): 45-48.
Abstract
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The antisymmetrized geminal power (AGP) and sequential product of geminals(SPG) functions, the basis functions with symplectic symmetry, are linearly combined to calculate the ground state of the LiHmolecule. The calculation results show that the AGPor SPGfunction gives the same ground state results as the linear combination.
Electrochemical Behavior and Redox Switch Properties of [Zn(dmit)
2
]
2-
HAN Ming-yong, BAI Yu-bai, LI Tie-jin, ZHANG Dong
1993, 9(1): 49-52.
Abstract
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The redox behavior of [Zn(dmit)
2
]
2-
and its electrodeposited film were investigated by cyclic voltammetry, and the Ⅰ-Ⅴ properties of the electrodeposited film were measured. The results show that [Zn(dmit)
2
]
2-
possesses good redox switch properties which exhibit good repeatability. It could be considered as a new material for molecular switch and memory.
Studies on the Surface Interaction Between MoO
3
and ZSM-11 Zeolite
DONG Yu-lin, LIU Jing, YANG Kong-zhang
1993, 9(1): 53-58.
Abstract
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Aseries of Mo-containing ZSM-11 zeolite catalysts has been prepared by calcining mixtures of MoO
3
and ZSM-11 zeolite, and studied by using X-ray diffraction and infrared spectroscopy. It has been found that MoO
3
can be well dispersed on ZSM-11 zeolite as a surface molybdenum species, and mostly within the zeolite cavities. With increasing the amount of dispersed MoO
3
, the zeolite framework is destroyed, and the crystallinity of the zeolite decreases. It seems that this perturbation is due to the strong interaction between dispersed MoO
3
and zeolite framework.
Ab Initio Studies on Eight Electronic States of the BH
2
Radical
GU Jian-ping, WANG Zhi-xiang, HUANG Ming-bao
1993, 9(1): 59-64.
Abstract
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The present paper covers ab initio UHFcalculations with a d, p-polarized basis set performed for eight electronic states of BH
2
and the equilibrium geometries, electronic term values Tc and vibrational frequencies of the five stable states X
2
A
1
,
2
B
1
,
2
B
2
, 2
2
A
1
and
2
A
2
. On the basis of the UHFresults, the states 2
2
B
2
.
2
B
1
and 3
2
A
1
are predicted to be unstable. The MP
2
/6-31G
**
calculations were performed for the X
2
A
1
and
2
B
1
, states, and the calculated equilibrium geometries, Tc value and vibrational frequencies are similar to the UHFresults. The MP
2
/6-31G
**
studies on the reaction BH
2
→BH + H for the X
2
A
1
and
2
B
1
states were carried out and the HB-Hbond energies of these two states were calculated.
Quantum Topological Studies on the Molecular Complexes-CO
2
-NCH and CO
2
-OH
2
LI Qing-ming, FU Xiao-yuan, ZHANG Jing-chang, CAO Wei-liang
1993, 9(1): 65-69.
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Topological properties of charge distribution for the title complexes and their constituent are analyzed by using ab initio calculations at 3-21Gbasis set. The results obtained are compared with those originated from ab initio and energy decomposition method. It has been determined that the title molecular complexes are T-shaped. The characteristics of the bonds and the changes originated from the formation of the complexes are discussed.
Radiation Damage of Crystal Polyesters
ZHANG Yi-qu, JI Dan-liang, LI Zhi-zhong, CHEN Xin-fang, TANG Ao-qing, LUO Yun-xia, Yang Hong, JIANG Bing-zheng
1993, 9(1): 70-73.
Abstract
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The change of crystal structures in polyethylene terephthalate (PET) and polyhexa methylene terephthalate (PHT) irradiated by γ-ray were investigated by using the methods of WAXDand SAXS. It was found that irradiation caused the crystal parameters of PETand PHTto lengthen, and the cell to expand; and at the same time, the long period and the thickness of lamellae were unchanged. These results indicate that the radiation damage of crystal polyesters causes the increase of lacunaries within the crystal polyester.
A Novel Complex of Pyridinium Polystyrylsulfonate with Fluoboric Acid as a Catalyst for Acetalization of Benzaldehyde with n-Butanol
HUANG Wen-qiang, LUO Jia-zhong, MEN Ai-ju, PAN Tong-tong, HE Bing-lin
1993, 9(1): 74-78.
Abstract
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Anew complex (1) was prepared by mixing pyridinium polystyrylsulfonate resin and aqueous fluoboric acid, followed by being dehydrated. 1 can be used as an acidic catalyst for the acetalization of benzaldehyde with n-butanol with a highly catalytic activity. The characterization and reusability of 1 are discussed.
Investigation on Feeding Back Current Reciprocal Oscillographic Chronopotentiometric New Techniques
ZHU Jun-jie, ZHENG Jian-bin, SHEN Lan, GAO Hong, BU Hai-zhi
1993, 9(1): 79-81.
Abstract
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Preparation and Intramolecular Electron Transfer of A Covalently Linked Zinc Porphyrin-Methyl Viologen (MV
2+
) Complex
WANG Qing-min, SUN Mei-rong, SHI Tong-shun, CAO Xi-zhang, TAO Jian zhong
1993, 9(1): 82-84.
Abstract
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)
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A New Indicator Reaction and Its Application-Catalytic Determination of Ultratrace Amounts of Rhodium with Linear Sweep Voltammetry
WANG Li-sheng, JIANG Zhi-liang
1993, 9(1): 85-90.
Abstract
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)
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Facile Syntheses and Desulfonylation of α-Alkyl- β-disulfones
WANG Ya-pin, HUANG Xian
1993, 9(1): 91-94.
Abstract
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)
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)
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Editor-in-Chief:
Jihong YU
ISSN 1005-9040
CN 22-1183/O6
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