中国化学快报

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A New Reagent for the Reduction of N-Arylsulfonylimines

Met Hua ZHANG, Jian Guo SHAO, Shen Yong JIANG, Juan JIANG, Qi ZHONG

中国化学快报. 1998, 9(12): 1073-1074.

摘要 ( )

可视化

N-arylsulfonyimines were reduced easily to the corresponding N-arylsulfonylamines with potassium selenated borohydride (KBH₂Se₃) under reflux in formamide.

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O-phosphorylation of Oligopeptides with Phosphoramidite

Yan Met LI, Yu Fen ZHAO, Herbert WALDMANN

中国化学快报. 1998, 9(12): 1075-1078.

摘要 ( )

可视化

Phosphopeptides were synthesized with bis-alkyloxy-N,N-dialkylphosphoramidite followed by oxidation. Many hydroxyl groups in oligopeptides can be O-phosphorylated in one step.

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Total Synthesis of 3 (R)-Panaxynol

Guang Rong ZHENG, Wei LU, Haji, A. AISA, Jun Chao CAI

中国化学快报. 1998, 9(12): 1079-1080.

摘要 ( )

可视化

The first stereoselective total synthesis of 3 (R)-panaxynol 1 has been achieved by utilizing the Cadiot-Chodkiczwicz reaction, through coupling of 3 (R)-(t-butyldiphenylsilyloxy)-l-penten-4-yne with l-bromo-alkyne compound.

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Helioal Structure and Optical Activity of Two New Derivatives of R-(+)-1,1'-Binaphthyl-2,2'-diol

Ji Jun HUANG, Feng XUE, Bing DENG, Thomas C. W. MAK

中国化学快报. 1998, 9(12): 1081-1084.

摘要 ( )

可视化

Correlation between the helical structure and optical activity of two derivatives of R-(+)-1,1'-binaphthyl-2,2'-diol was derived from a study of their optical rotations, CD curves and X-ray crystal structures.

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Study on the Inclusion Complex of C₆₀ and Calix [8] arene Tetraphenyl Ether

Zai Hong CHEN, Jun LIN, Nan Feng ZHENG, Hut ZHANG

中国化学快报. 1998, 9(12): 1085-1086.

摘要 ( )

可视化

The inclusion complex of C_(x) with p-tert-butyl calix [8] arene tetraphenyl ether was prepared. The stoichiometry and association constant K_ass of this inclusion complex were determined.

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Scavenging Effect of Perylenequinone Hydroxyls on Free Radicals:A Theoretical Study

Hong Yu ZHANG

中国化学快报. 1998, 9(12): 1087-1090.

摘要 ( )

可视化

The semiempirical method AM1 was used to calculate △HOF values of perylenequinone (PQ), and △HOF was used as a theoretical parameter to predict the scavenging ability of PQ hydroxyls. Owing to strong intramolecular hydrogen bonds and the electron-attracting property of the keto-function, hydroxyls of PQ were so weak in scavenging free radicals that the its effect was negligible in photodynamic therapy. However, when PQ was substituted with strong electron-donating groups, its scavenging activity was enhanced markedly.

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Study on the Regulation of Diorganogermanium Compounds on the Maillard Reaction of Histidine and Glycine by Fluorescence Spectrum

Ji CHEN, Gen Xiang MA, Xiao Jing LI, Shu Gong ZHANG, De Qian LI

中国化学快报. 1998, 9(12): 1091-1092.

摘要 ( )

可视化

The suppression of diorganogermanium compounds on the Mai Hard reaction of histidine (His) and glycine (Gly) with glucose has been determined by fluorescence spectrum under physiological conditions. The title compounds show inhibition for the fluorescence intensity (FI) of glycosylated amino acids stronger than Ge-132.

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A New Trinortriterpenoid from Cleome chrysantha

Ye Gao CHEN, Guo Wei QIN, Arafa I. HAMED, Nasra EL-EMARY, Kung Kai CHEUNG, Kin Fai CHENG

中国化学快报. 1998, 9(12): 1093-1094.

摘要 ( )

可视化

A new trinortriterpenoid, 1-epibrachycarpone, was isolated from the aerial parts of Cleome chrysantha. Its structure was elucidated by spectral and X-ray crystallographic studies.

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Studies on the Chemical Constituents of Lysimachia capillipes Hemsl

Chen XIE, Li Zhen XU, Bao Hua ZHAO, Shi Lin YANG

中国化学快报. 1998, 9(12): 1095-1096.

摘要 ( )

可视化

Eight compounds were isolated from the ethanolic extracts of Lysimachia capillipes Hemsl. They were identified as capilliplactone 1,capillipnin 2,β-daucosterol 3,succinic acid 4, quercetin 5, 3',4',5,5',7-pentahydroxyflavone 6,quercetin-3-O-β-D-glucopyranoside 7 and kaempferol 8 on the basis of chemical and spectral methods. Among them, 1 and 2 were new, their structures were established as all-cis-5-deoxy-pentonic acid-y-lactone and 1,2,4,5-tetrahydroxy-3-n-pentyIbenzen-2,4-di-0-β-D-glucopyranoside through their spectral data (¹HNMR, ¹³CNMR, DEPT, ¹H-¹H COSY, H¹-¹³C COSY, HMBC etc).

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Two New Sesquiterpenes from Atractylodes macrocehpala

Qi Feng ZHANG, Shi De LUO, Hut Yin WANG

中国化学快报. 1998, 9(12): 1097-1100.

摘要 ( )

可视化

Two new sesquiterpenes:beishulenolide A 1 and peroxiatractylenolide Ⅲ 2 were isolated from Atractylodes macrocepkala Koids (compositae).Their structures were elucidated on the basis of spectral evidence, especially 2D-NMR methods and chemical conversion.

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Taxoids from the Needles of Taxus×media Hicksii

Yong Li GAO, Jin Yun ZHOU, Di An SUN, Qi Cheng FANG, Nan WU, Yang LU, Qi Tai ZHENG

中国化学快报. 1998, 9(12): 1101-1104.

摘要 ( )

可视化

A new taxane diterpenoid, named 7-deacetoxy taxinine J, together with ten known compounds were isolated from the needles of Taxus×media Hicksii. The structures of all compounds were elucidated and identified by spectroscopic methods. The structure of 7-deacetoxy taxinine J was further confirmed by X-ray crystallographic analysis. The structure of the known compound, taxinine E, was also revised.

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Mitoxantrone Determination by 1,5-order Differential Stripping Voltammetry

Man Dong GUO, Yun Long FU

中国化学快报. 1998, 9(12): 1105-1108.

摘要 ( )

可视化

A rapid and sensitive 1.5 order adsorptive stripping voltammetric method for determination of trace mitoxantrone (MXT) is described. The accumulation behavior of MXT on a mercury film microelectrode was studied and the possibility of carrying out 1.5 order differential adsorptive stripping analysis using mercury-coated carbon fiber microelectrode was demonstrated. Optimal conditions for 1.5 order differential voltammetry monitoring are described. The stripping peak current is linearly proportional to the concentration of MAT in the range of 1.0×10^-6mol/L-1.0×10^-9 and detection limit is 1.5×10^-10mol/L. The relative standard deviation (RSD) is 3.0% at 5.0×10^-1 (n=8). MXT can be determined directly in biological samples at physiological levels without any separation procedure.

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Fabrication of Chemically-Modified Electrode Containing 1:12 Phosphomolybdic Anions by Sol-Gel Technique and Its Electrocatalytic Reduction of BrO₃^- Anions

Wen Bo SONG, Chang Qing SUN

中国化学快报. 1998, 9(12): 1109-1112.

摘要 ( )

可视化

A novel chemically-modified electrode containing 1:12 phosphomolybdic anions was achieved on the surface of platinum electrode by the sol-gel technique. The electrode exhibits a high catalytic activity towards the electroreduction of BrO₃^- anions.

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Hydrothermal Synthesis and Characterization of a Novel Low Temperature Phase K₄InTi₄O₁₁ (OH)·5H₂O

Wen Jun ZHENG, Yi Hua XU, Wen Qin PANG, Guang Yao MENG

中国化学快报. 1998, 9(12): 1113-1114.

摘要 ( )

可视化

A novel low temperature phase K₄InTi₄O₁₁ (OH)·5H₂0 was prepared by the hydrothermal method. The product was characterized by XRD, SEM, TG, DTA and ICP. The results indicated that the product crystallizes in a cubic system with a cell parameter a=0.7868 nm. Moreover, it ecomposes to an amorphous phase after calcining at 340℃.

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Assessment of Defects and Collapsed Sites in Self-Assembled Alkanethiol Monolayer on Gold by Cyclic Voltammetry and A.C.Impedance

Peng DIAO, Dian Lu JIANG, Xiao Li CUI, Deng Ping GU, Ru Ting TONG, Bing ZHONG

中国化学快报. 1998, 9(12): 1115-1118.

摘要 ( )

可视化

Self-assembly of octadecyl mercaptan on gold was investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Results of CV experiments show that there are no structural defects exposed directly to the redox couple in solution, but EIS experiments indicate that collapsed sites exist in the monolayer. A method to estimate the degree of disorder in the Au/thiol monolayer surface is proposed by using admittance plane plot.

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The Aggregation Kinetics of Colloidal Particles of Basic Yttrium Carbonate

Hui WANG, Ju ZUO, Shi Yi GUO, Ying Li AN, Zun Sheng CAI, Yin Ming PAN, Xue Zhuang ZHAO

中国化学快报. 1998, 9(12): 1119-1122.

摘要 ( )

可视化

The aggregation kinetics of basic yttrium carbonate particles in aqueous solution have been studied using dynamic light-scattering techniques. In 1.00 mol/l NaCl solution fast diffusion-limited aggregation behavior was observed with an increase in aggregate size over time described by a power law. The aggregates are characterized by a fractal dimension D=1.82. Smoluchowski and fractal theories were used to characterize the aggregation mechanism and to obtain the aggregation rate constant.

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Thermodynamics of the Dissociation of Carbonic Acid in Mixed Solvent.4. The System of NaHCO₃-Na₂CO₃-NaCl-Ethanol-Water

Jia Zhen YANG, Dian Zhen LU, Mei HE, Li GUO

中国化学快报. 1998, 9(12): 1123-1124.

摘要 ( )

可视化

The determination of the second dissociation constant of carbonic acid in 5, 15 and 25 mass % ethanol-water mixed solvents has been made by emf method at 278.15 to 318.15K.The solute-solvent interaction was discussed.

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Synthesis, Structure and Non-linear Optical Properties of Iron Mercury Tetrathiocyanate

Yun Xing YAN, Qi FANG, Wen Tao YU, Yu Peng TIAN, Duo Rong YUAN, Xin Qiang WANG, Fan Qing MENG, Zhi Gang CAI, Ling Zhi ZHANG

中国化学快报. 1998, 9(12): 1125-1128.

摘要 ( )

可视化

Iron Mercury Tetrathiocyanate (FeHg(SCN)₄) has been synthesized and its structure has been determined. It belongs to the tetragonal system, 14 space group. The Hg-S-C≡N-Fe bridge leads to the formation of an infinite three dimensional network. Irradiated by a 1.064 nm Nd:YAG laser beam, FeHg (SCN)₄ showed a 0.532 nm second harmonic intensity which is 0.6 times as that of organic nonlinear optical crystal urea.

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In-Situ Synthesis of Terbium Complex with Salicylic Acid in Silica Matrix by a Two-Step Sol-Gel Process

Lian She FU, Hong Jie ZHANG, Shu Bin WANG, Qing Guo MENG, Kui Yue YANG, Jia Zuan NI

中国化学快报. 1998, 9(12): 1129-1132.

摘要 ( )

可视化

A process for in situ synthesis of terbium complex with salicylic acid by a two-step sol-gel method in silica matrix has been proposed. The luminescence properties of the silica gels codoped with terbium and salicylic acid have also been discussed with respect to that of the gel doped with terbium and that of pure terbium complex with salicylic acid.

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The Nature of Bonding in IrC

Xiao Guang XIE, Xian Jun BI, Huai CAO, Shu Shan Dai

中国化学快报. 1998, 9(12): 1133-1136.

摘要 ( )

可视化

The nature of bonding in the title compound has been studied by using CASSCF and FOCI techniques. The ground state of IrC has been found to be ²△ arising primarily from:..1б²2б²1π⁴1δ³3б² configuration, which forms a triple bond between Ir and C atoms (one б; two π). The lowest quartet state is ⁴Φ state which has the configuration:..1б²2б²1π⁴2δ¹3б¹ and lies higher than the ground state by 1.25eV. The molecular constants of the ground state calculated at CASSCF level by using Morse's mode are:Re=1.6904Å, De=4.86eV, We=l139 cm^-1, and B₀=0.5219cm^-1 comparable with the spectrum values (Re=1.6858?, De=6.44 eV, We=1051cm^-1 and B₀=0.5251cm^-1).

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¹¹B and ⁷Li NMR Investigations of the Oxysulfide Glasses in Li₂S-B₂O₃ (-LiBr) Systems

Hat Chun GAO, Chan Gmin SUN, Zi Rong LI, Yan HUO

中国化学快报. 1998, 9(12): 1137-1140.

摘要 ( )

可视化

The fraction of 4-coordinated borons and motional narrowing of lithium ion for oxysulfide glasses in the Li₂S-B₂0₃(-LiBr) systems are measured by the ¹¹B and ⁷Li NMR technique. The structrural modifications resulted from the modifier Li₂S and dopant LiBr components and their effects on ionic conduction are discussed.

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A Novel Pentadecanuclear Neodymium Cluster:Synthesis and Structure of [Nd₁₅(μ₄-tyr) ₁₀ (μ₃-OH) ₂₀ (μ₂-OH) ₄ (OH) ₁₀ (μ₂-H₂O)-(H₂O) ₁₀] [Na (ClO₄)₂]·61H₂O

Rui Yao WANG, Zhe Ming WANG, Song GAO, Tian Zhu JIN, Zhi Da CHEN, Chun Hua YAN, Guang Xian XU, Cun Heng HE

中国化学快报. 1998, 9(12): 1141-1144.

摘要 ( )

可视化

The title complex was synthesized by dissolving tyrosine (tyr) in an aqueous solution of Nd (C10₄)₃ at NpH5, and its crystal structure was determined by X-ray diffraction methods. The complex is a novel pentadecanuclear with the 15 Nd³⁺ ions connected by μ₃-OH^- ions. The tyrosine ligands are all in their anionic form, and each coordinates to the neodymium ions via the nitrogen atom of the amino group and the two carboxyl oxygen atoms. The molecule a barrel structure.

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1998年, 第9卷, 第12期　刊出日期：1998-12-20

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1998年, 第9卷, 第12期 刊出日期：1998-12-20

1998年, 第9卷, 第12期　刊出日期：1998-12-20