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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Chemical Society
Journal Basic Information
Journal DOI :
Korean Chemical Society
Editor in Chief :
Byeong Moon Kim
Volume & Issues
Volume 34, Issue 6 - Nov 1990
Volume 34, Issue 5 - Sep 1990
Volume 34, Issue 4 - Jul 1990
Volume 34, Issue 3 - May 1990
Volume 34, Issue 2 - Mar 1990
Volume 34, Issue 1 - Jan 1990
Selecting the target year
A Kinetic Study of the Substitution of
-Disketone in Bis(
Hwang, Gyu Tak ; Kim, Jeong Seong ; Sin, Han Cheol ; Kim, In Hwan ; Kim, Gi Tae ;
Journal of the Korean Chemical Society, volume 34, issue 4, 1990, Pages 319~324
Kinetic of substitution of dibenzoylmethanate (dbm) for one acetylacetonate (acac) in VO (acac)
have been studied in various solvents by spectrophotometry. Under the condition [VO (acac)
] 》[Hdbm], the rate law for the substitution reaction is expressed as, rate = k
] [Hdbm] / (1 ＋ K[VO(acac)
]) where K = [VO (acac)
dbmH] / [VO(acac)
][Hdbm] and the rate constant k
corresponds to that of proton transfer from coordinated Hdbm to leaving acac- in VO(acac)
Solubilities of Solids in Supercritical Fluids (Ⅰ)
Kim, Jeong Rim ; Gyeong, Jin Beom ;
Journal of the Korean Chemical Society, volume 34, issue 4, 1990, Pages 325~330
The solubilities of caffeine in supercritical ammonia were measured at various temperatures and pressures to represent the relationship between the solubility and the density of ammonia at desired temperature and pressure by means of a simple equation. Using the equation, the interaction virial coefficient between ammonia and caffeine has been determined to give the parameters of Lennard-Jones potential function for the system. Furthermore, there are comparisons and discussions of the interaction virial coefficients and Lennard-Jones potential functions determined by the same techniques from the solubility data of naphthalene in supercritical ammonia and of caffeine and naphthalene in supercritical carbon dioxide from existing data sources others.
The MO Study about Interaction of cis-Diamminedichloroplatinum (cis-DDP) Complexes with DNA base, 1-Methylcytosine, for Development of Anti-Tumor Drugs
Kim, Ui Rak ; Kim, Sang Hae ; Edward A. Boudreaux ;
Journal of the Korean Chemical Society, volume 34, issue 4, 1990, Pages 331~339
It has been studied that relations between electronic structure and anti-tumor activity by variation of amine group in cis-diamminedichloroplatinum (Ⅱ) complexes. We were also interested in these Pt (Ⅱ) complexes interaction with 1-methylcytosine of DNA base and the electronic structure of these complexes in order to understand the mechanism of the metal-nucleobases interaction. The results showed that net charge of center metal in Pt complexes effect anti-tumor activity. The mechanisgm of the bonding between metal and ligands largely based on charge transfer from ligand to metal atom. Furthermore, the established molecular orbitals showed that metal 6p-orbitals played an important role in the bonding scheme for the interactions between platinum (Ⅱ) complexes and 1-methylcytosine. We also found that the stronger Pt-N3 bonding strength became, the better anti-tumor agents were.
Effect of High Pressure on Voltammetric Parameters of Bilirubin
Bae, Jun Ung ; Lee, Heung Rak ; Kim, Gyeong Ho ; Park, Tae Myeong ;
Journal of the Korean Chemical Society, volume 34, issue 4, 1990, Pages 340~344
The pressure effect of voltammetric parameters for the oxidation of Bilirubin in 0.1 M TEAP-DMSO solution at micro Pt electrode has been investigated. With increasing the pressure from 1 to 1,800 bars, the peak potential of oxidation wave shifted to the more positive potential. The peak current becomes considerably smaller with increasing the pressure. The oxidation currents of Bilirubin was found to be diffusion controlled over all pressure ranges. The reversibility of oxidation step did not change with increasing pressure. The linear relationships were observed over all pressure ranges (1-1,800 bars).
Optical Resolution of DABS-Amino Acids with Mobile Chiral Chelate Addition
Lee, Seon Haeng ; O, Dae Seop ; Byeon, Seong Gu ;
Journal of the Korean Chemical Society, volume 34, issue 4, 1990, Pages 345~351
Optical isomers of DABS-amino acids have been separated in a reversed phae high performance liquid chromatography by adding Cu (Ⅱ)-L-Proline chelate to the mobile phase. The retention behaviors for the DABS-amino acids are discussed in terms of pH of the mobile phase and the concentrations of acetonitrile, Cu (Ⅱ) complex, and buffer. The selectivity of the optical isomers of DABS-amino acids increases with the pH of the mobile, and the concentration of the chelate, but decreases with concentration of the oganic modifier. The concentration of buffer does not affect the optical separation selectivity. A separation mechanism is illustrated by cis and trans formation based on the steric effect of the ligand exchange reaction between DABS-amino acids and the copper chelate.
Trace Analysis as TBDMS Derivatives of Organic Acids in Aqueous Samples
Kim, Gyeong Rye ; Kim, Jeong Han ; Park, Hyeong Guk ;
Journal of the Korean Chemical Society, volume 34, issue 4, 1990, Pages 352~359
An effecient gas chromatographic method is described to be used routinely for the rapid profiling and identification of biochemically important organic acids. It involves the solid-phase extraction of organic acids from aqueous samples using Chromosorb P as the solid sorbent and diethyl ether as the eluting solvent, with subsequent triethylamine treatment. The resulting triethylammonium salts of acids were directly converted to volatile tert-butyldimethylsiyl derivatives, which were simultaneously analyzed by two capillary columns of different polarity, DB-5 and DB-1701, under the identical temperature programming condition. The retention index (RI) and area ratio (AR) values of each peak measured on DB-5 and DB-1701 enabled rapid identification of acids by computer RI library search and AR comparison. The application of the present method to the organic acid profiling of various complex samples is demonstrated.
Catalytic Properties of Borosilicate in Methanol Conversion
Lee, Gye Su ; Jo, Min Su ; Jeong, Byeong Gu ; Seo, Gon ;
Journal of the Korean Chemical Society, volume 34, issue 4, 1990, Pages 360~369
Borosilicate, HZSM-5 zeolite and iron-substituted borosilicate and HZSM-5 zeolite were prepared and their catalytic properties in methanol conversion were studied. The effects of strength and amount of acid site determined from TPD spectra of ammonia on the product distribution was examined. Selectivity to propylene was high over borosilicate with small amount of strong acid site, but selectivity to aromatic compound was high over HZSM-5 zeolite with large amount of the strong acid site. The participation of weak acid site on the conversion did not confirmed, and the product distribution could be explained in terms of the amount of the strong acid site. Although the amount of the weak acid site was increased by substitution of iron, there was no meaningful change in the product distribution.
A Study on the Synthesis of Aluminium Nitride
Park, O Gyun ; Choe, Sang Uk ; Lee, Hui Cheol ;
Journal of the Korean Chemical Society, volume 34, issue 4, 1990, Pages 370~376
Synthesis of aluminium nitride has been studied by using the starting materials such as-alumina which was prepared at the lowest temperature from AlO(OH), anhydrous aluminium chloride and metallic aluminium powders. For the synthesis of aluminium nitride, the reaction temperature was carefully controlled and the reaction conditions were determined and discussed with the results. Reaction of metallic aluminium powder and nitrogen gas was taken place at relatively low temperature. The reaction parameters were determined kinetically.
Transport Characteristics of Alcohol Solutes through Copolymer Hydrogel Membranes Containing Poly(2-Hydroxyethylmethacrylate)
Park, Yu Mi ; Kim, Eun Sik ; Seong, Yong Gil ;
Journal of the Korean Chemical Society, volume 34, issue 4, 1990, Pages 377~383
Three kinds of hydrogel membranes were prepared by the copolymerization of 2-hydroxyethylmethacrylate (HEMA) with acrylamide, N, N-dimethylamide and methylmethacrylate in the presence of solvent and crosslinker respectively. The equilibrium water content, relative permeability and partition coefficient of the membranes for alcohol solutes were measured. It has been found that the permeation of organic solute occurs through the water-filled regions in the hydrogel membrane, and that the gpermeability coefficient of organic solute depends on the molecular size. But the permeability of organic solute was controlled by the interaction of solute-membrane at the low water content. By the partition data, it has been shown that the partition of solute is only controlled by hydrophobic interaction between solute and membrane. The diffusion coefficient data were interpreted on the basis of water-solute interaction. It has been found that the diffusion of organic solute is determined by the free volume of water in the membrane, and that hardly depends on polarity-polarizability and hydrogen bonding ability between water and solute.
A New Route to 5-Hydroxy-4-methylheptan-3-one
Kim, Jeong Han ; O, Won Taek ; Gang, Seok Gu ;
Journal of the Korean Chemical Society, volume 34, issue 4, 1990, Pages 384~386