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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
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Volume & Issues
Volume 12, Issue 4 - Dec 1968
Volume 12, Issue 3 - Sep 1968
Volume 12, Issue 2 - Jun 1968
Volume 12, Issue 1 - Mar 1968
Selecting the target year
Stability of Metal Chelates of 7-Nitroso-8-Hydroxyquinoline-5-Sulfonate
Choe, Gyu-Won ; Lee, Dong-Hyung ; Oh, Joon-Suk ; Lee, Kwang-Woo ;
Journal of the Korean Chemical Society, volume 12, issue 3, 1968, Pages 81~84
Stabilities of chelates of 7-nitroso-8-hydroxyquinoline-5-sulfonate have been determined for divalent transition metal ions, Mn(Ⅱ), Fe(Ⅱ), Co(Ⅱ), Ni(Ⅱ), Cu(Ⅱ), and Zn(Ⅱ) by means of the Calvin-Bjerrum technique. Comparison of these stability constants with those obtained for 8-hydroxyquinoline, and 8-hydroxyquinoline-5-sulfonate shows that the observed differences are essentially the results of the lower basicity of the sulfonated group and different metal-ligand bond. The divalent metal chelate stability sequence is not in agreement with the reported metal orders for other chelating agents. The stabilities were found to follow the order Mn(Ⅱ) < Fe(Ⅱ)
Co(Ⅱ) > Ni(Ⅱ) < Cu(Ⅱ) > Zn(Ⅱ).
Some Considerations on Cyclopentadiene by the Extended Huckel Method
Pack, Byung-Kak ;
Journal of the Korean Chemical Society, volume 12, issue 3, 1968, Pages 85~88
The resonance parameter value between the saturated carbon and unsaturated carbon atom in cyclopentadiene has been evaluated. And then cyclopentadiene has been investigated on the correlations between it's electronic structures and reactivities by means of the extended Huckel method proposed by R. Hoffmann.
A Theoretical Consideration on the Reactivities of the Prophin and Phthalocyanine Nucleus by the Simple Huckel Method
Pack, Byung-Kak ; Hong, Young-Suk ;
Journal of the Korean Chemical Society, volume 12, issue 3, 1968, Pages 89~92
A theoretical study was made on the energies of
electrons and the reactivity of each atom of porphin nucleus and phthalocyanine nucleus in the ground states. The energy of each
orbital, the superdelocalizabilities and the bond orders have been calculated by the simple Huckel method. With respect of these two compounds, results of the calculations have shown that the energy differences between highest occupied orbitals and lowest vacant orbitals are relatively less than those of other common organic compounds. This suggests that these two compounds will be easily excited. Then, by superdelocalizabilities and bond orders, the reactivities of electrophilic, nucleophilic and radical reactions and bond strenghs have been respectively considered.
Studies on the Molybdenum Complexes
Oh, Sang-Oh ;
Journal of the Korean Chemical Society, volume 12, issue 3, 1968, Pages 93~98
A series of Molybdenum thiocyanate complex has been prepared as new compound:
, where Py = Pyridine. Properties and configuration of the complexes were studied by chemical and physical method.
Syntheses of Metallic Monoazo Complexes
Hahn, Chi-Sun ; Park, Dae-Chul ; Nam-Goong, Ha-Il ; Kang, Yong-Ik ;
Journal of the Korean Chemical Society, volume 12, issue 3, 1968, Pages 99~105
Some ortho-hydroxy monoazo-compounds have been synthesized and these were metallized with transition elements. Chromium trioxide, cupric acetate and cobalt acetate were used for the metallization. The following facts have been found in this investigation: (1) water is the best solvent, when compared to various organic solvents, for the metallization, (2) the optimum pH for the metallizing mixture ranges from 4.5 to 5.5, (3) the solubility of these metallic monoazo-compounds in water depends mainly on the composition of the complexes and to some extent on the presence of sulfonic acid groups in the molecules, and (4) metallized compounds having two ortho-hydroxy groups per molecule have stronger binding characteristics.
The Kinetics and Mechanism of Nucleophilic Addition of Mercaptan to a
-Nitrostyrene in Acidic Media (I)
Park, Ok-Hyun ;
Journal of the Korean Chemical Society, volume 12, issue 3, 1968, Pages 106~113
The rate-constants of the nucleophilic addition reaction of n-butylmercaptan to 3,4-methylenedioxy-
-nitrostyrene were determined at various acidic pH and a rate equation which can be applied over wide pH range was obtained. From this equation, one may conclude that this reaction is started by addition of mercaptan molecule below pH 3, while above pH 6, the overall rate of addition is almost only depend upon the concentration of nitrostyrene and the mercaptide ion. At pH 3∼6, the complex mechanism of this addition reaction can also be fully explained by the rate equation.
Dehydropolycondensation of Aminopenols under the Catalytic Action of Metallic Chelate Compounds (I) Effects of the Solvents and Characteristics of the Oligomers Obtained
Choi, Kyu-Suck ;
Journal of the Korean Chemical Society, volume 12, issue 3, 1968, Pages 114~120
Fe-EDTA complex, which is easily formed when Fe salt and EDTA.2Na are mixed in the aqueous medium, is found to be a very effective catalyst in the dehydropolycondensation of aminophenols. In the dehydropolycondensation of aminophenols, the catalyst, Fe(Ⅲ)-EDTA complex (higher oxidation state) is reduced to less stable Fe(Ⅱ)-EDTA complex (lower oxidation state), and the latter is easily oxidized by air to the original higher oxidation state complex, therefore the catalytic action of Fe-EDTA complex is found to be recycled effectively. Under the catalytic action of the above mentioned complex, p-aminophenol is polymerized in the aqueous medium to form the oligomers of p-aminophenol, which the degree of polymerization to be 5 or more. The oligomers formed contain partly quinone nucleus as well as amino and hydroxyl groups. In this study, the effects of the solvents and characteristics of the oligomers are discussed. These types of polymerizations catalyzed by the metallic chelate compounds are considered to be very closely related to the reactions in the living matters.
Dehydropolycondensation of Aminophenols under the Catalytic Action of Metallic Chelate Compounds (II) Effects of the Ligands, Structures of the Mixed Complexes, and Side Reactions
Choi, Kyu-Suck ;
Journal of the Korean Chemical Society, volume 12, issue 3, 1968, Pages 121~127
In the oligomerization of p-aminophenol under the catalytic action of the metallic complexes, the effects of the ligands are studied. When the initial velocity of
uptake at pH 8 using Fe(Ⅲ) as the central metal and N-hydroxylethylethylenediaminetriacetic acid (HEDTA), ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), 1,2-cyclohexanediaminetetraacetic acid(CyDTA) as the ligands respectively are compared, the velocities are as the following order: HEDTA > EDTA > DTPA > CyDTA. Further when the effect of the ligands, nitrilotriacetic acid (NTA), HEDTA, EDTA, and DTPA, on the yields of oligomers are compared, the result shows as the following order: NTA > HEDTA > EDTA > DTPA. These are nearly reverse order of the stability constants of the complexes. In order to determine the composition of the mixed complexes at the initial step, the method of continuous variation is used, and it is found that the composition ratio of Fe-EDTA complex to monomer in the mixed complexes is one at pH 5-8 range. It is also found that at pH 9 or in the more alkaline range, side reactions occur to form water soluble dimer of quinone type and the catalytic action of the metallic complex markedly decreases on account of the hydrolysis of the central metal by the
Dehydropolycondensation of Aminophenols under the Catalytic Acition of Metallic Chelate Compounds (Ⅲ) Reactions of the Isomers, Reaction Mechanisms, and the Structures of the Oligomers
Choi, Kyu-Suck ;
Journal of the Korean Chemical Society, volume 12, issue 3, 1968, Pages 128~137
In the oligomerization of p-aminophenol by the catalytic action of Fe-EDTA complex in the aqueous medium, the mixed complex intermediate, Fe-EDTA-M type, is considered to be formed, from which active radicals of the monomer are produced. In this system, polymerization is presumed to proceed as follows: Free radical formation
Coupling, and so on. In this study, the form of the monomer and coordination state in the mixed complex, the catalytic action of Fe-EDTA the complex, the reaction mechanism, and the structure of the oligomers are discussed.
Thin Layer Chromatography에 依한 糖의 分離
Byeon, Hyeong-Jik ; Kim, Jae-Rok ;
Journal of the Korean Chemical Society, volume 12, issue 3, 1968, Pages 138~138