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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Chemical Society
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Journal DOI :
Korean Chemical Society
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Volume & Issues
Volume 13, Issue 4 - Dec 1969
Volume 13, Issue 3 - Sep 1969
Volume 13, Issue 2 - Jun 1969
Volume 13, Issue 1 - Mar 1969
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The Effect of Temperature on the Critical Micelle Concentration of Hexadecyl Trimethyl Ammonium Bromide
Kun Moo Lee ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 1~4
Temperature effect on the critical micelle concentration of hexadecyl trimetyl ammonium bromide over the range of
has been investigated by the method of electrical conductivity. The values obtained have been formulated as a power series in T. Several thermodynamic parameters have been calculated for the temparature range examined and their values have been discussed in the light of current theories on the participation of solvent in micelle formation.
Thermodynamics of Metal Chelate Formation of 8-Hydroxyquinoline-5-Sulfonic Acid
Kun Moo LEE ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 5~8
Acid dissociation constants and chelate stability constants of 8-hydroxyquinoline-5-sulfonic acid have been determined for divalent metal ions. Co (Ⅱ), Ni (Ⅱ) and Zn (Ⅱ) by means of the Calvin-Bjerrum technique at the various temperatures. The standard free energy changes for the reactions at
were calculated, and the corresponding values of
applying over this temperature range are reported. The results are interpreted on the basis of current theories of metal chelate formation in aqueous solution.
Partial Molal Volumes of Anilinium Chloride in Methanol-Water Mixtures
SANG-KI YOON ; IKCHOON LEE ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 9~12
Partial molal volumes of anilinium chloride in several methanol-water mixtures have been determined at
. The maximum in limiting slopes and the minimum in partial molal volumes at 0.4 mole fraction have been interpreted as the result of maximum electrostriction of the solvent with the minimum free volume.
Studies on Corrosion Inhibitors
Kae Soo Lee ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 13~15
This investigation is to make comparative evaluation of the corrosion inhibiting effects of quinoline, oxine and 7-nitroso 8-hydroxy quinoline (7NHQ). In case of quinoline, and oxine, since the N atom in them functions as cation, the process involved is assumed to be cathode control. On the other hand 7-NHQ was found to form a stable chelate compound with
ion in acidic solution and shows as anode control predominantly. After plotting polarization curves, Tafel parameters were calculated in each solution involving the inhibitors, at the same time corrosion inhibiting effects were separately measured and compared from data of both corrosion current and analytical method.
STUDIES ON METAL CUPFERRATE COMPLEXES IN MIXED SOLVENTS
SI-JOONG KIM ; YOON CHANG-JU ; CHANG IN-SOON ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 16~24
Absorption Spectra and the Structure of Metalized Monoazo Complexes
CHI SUN HAHN ; DAE CHUL PARK ; KOOK JIN BAE ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 25~28
UV absorption spectra of some metalized monoazo complexes have been measured, and the structure of the complexes is discussed based on the spectra. A compressed octahedron is proposed as the geometrical structure of the complexes.
Inorganic polymers of metal (Ⅱ) ions with Schiff's Base of quinizarin-ethylenediamine
Joon Suk Oh ; Won Suk Kwak ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 29~36
lnorganic polymers, which are composed of metal (Ⅱ) ions and Schiff's Base of quinizarin-ethylenediamine, have been prepared. In order to find out proper conditions for the reaction, some investigations have been carried out to test the effect of pH, kind of solvent and the state of reagent. As a result, the highest yield occurred near pH 7 and it was found that there were not great difference in the kind of solvent and the state of reagent we had used. Most of the polymers are seemed not to be those we have attempted to prepare. They are found to be coordination polymers which have rather low molecular weight.
Cation Exchange Behavior of Molybdenum (Ⅵ) and Tungsten (Ⅵ)
Kee Won Cha ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 37~40
The separation and species of
at the various PH value have been studied by the method of cation exchange chromatography. Elution curves of
have been made with a 5 cm column of the resin,
(100-200 mesh), using solutions of various PH value as eluent. Complete separation of
was obtained in each PH of 10% EtOH. According to the evaluation of peak position and number of peaks of elution curves, it is likely to exist cationic species of
Die Bestimmung von Spurenelementen in Naurlichen Wassern durch Rontgenfluoreszenzspektrometrie nach Konzentration durch Verdampfen (Ⅰ)
Yung Kyu Park ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 41~44
Eine neuentwickelte Methode zur Herstellung von Me
praparaten wird fur die Bestmmung der Spurenelemente in Wasser Rontgenfluroreszspektrometrie angewendet. Supuren von Kupfer, Blei, Zink, Nickel, Kobalt und Eisen werden aus großen Mengen von naturlichem Wasser durch Verdampfen konzentriert. Aus der konzentrierten Losung werden die Spurenelemente durch Einleitung von Schwefelwasserstoff bei pH 8 unter Zusatz von Aluminiumsulfat-Trager ausgefallt. Die Niederschlage der Metallsulfide werden durch Membranfilter filtriert, mit Gelatine fixiert und ihre Absolutmengen durch Rontgenfloreszenzanalyze bestimmt. Kupfer, Blei, Zink, Nickel, Kobalt und Eisen werden bei einer Konzentration von 2.5 bis 50.0 p.p.b. mit einer relativen Standardabweichung 14.0% gemesser.
Die Bestimmung von Spurenelementen in Naturlichen Wassern durch Rontgenfluoreszenzspektrometrie nach Kontinuierlicher Dithizonextraktion mit Hilfe der Pulsationskolone (Ⅱ)
Yung Kyu Park ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 45~48
Spuren von Blei und Zink werden aus großen Wassermengen mit benzolischer Dithizonlosung in einer Pulsationskolonne durch kontinuirliche Flussig-Elussig-Extraktion angereichert. Nach der Extraktion wird das Benzoly-peroxid oxydiert und die Spurenelemente durch verdunnte Salzsaure zuruckextrahiert. Die angereicherten Metalle werden durch Einleiten von Schwefelwasserstoff aus der Losung bei pH 8 unter Zusatz von Aluminium Trager ausgefallt. Die Niederschlage der Metallsufide werden durch Membranfilter filtriert, mit Gelatine fixiert und ihre Absolutmengen durch Rontgenfluoreszenzanalyse bestimmt. Blei wird bei einer Konzentration von 2.5 bis 100 p.p.b. mit einer relativen Standardabwechung von 9.0% und Zink bei einer Konzentration von 2.5-100 p.p.b. mit einer relativen Standardabwechung von 10.3% gemesssen.
The X-Ray Fluorescent Spectrographic Analysis of Silicate Minerals
Chan Kuk Kim ; Ki Nam Sang ; Hwang Am Kim ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 49~55
X-ray Fluorescence Spectrographic method has been applied for the rapid determination of main components, such as
, CaO, MgO and
in Silicate Minerals. In this method, Boric Acid was used as a binder after fusion with Lithium Tetraborate in the briquet-making process. The Lithium Flubride, Ammonium di-Hydrogen Phosphate and Ethylene Diamine d-Tartrate crystals were used with Scintillation counter and Gas Flow counter as the detectors. Several influences on this method were discussed, including the particle size of samples and reducing of the matrix effects by dilution with Boric Acid and addition of Lanthanum Oxide with the diluent. In order to test the reproducibility of this method described above, the determination of the same kind of samples were carried out repeatedly, and the results obtained were presented in the table. Calibration curves for each element were presented, and the application of the method was tested with International Rock Standard T-Ⅰ. All the results obtained by X-Ray Fluorescence Spectrographic method were compared with the results by conventional chemical method.
Studies on the Characteristics of Humic Acid and its Utilizations. (II) Characteristics of humic acid (Molecular weight, molecular and rational formula. Structure)
Won Taik Kim ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 56~61
By the chemical procedure and infra-red spectroscopy, the characteristics of humic acid were studied. The results were as follows: 1. Molecular weight. 5,200. 2. Molecular formula.
. 3. Rational formula. 4. Confirmation of the accurate structure of humic acid is beyond us nowadays. The structure is speculated that it may be a kind of condensed polymer of many benzene kerns in which above mentioned various functional groups are attached. Also some part of the large quantities of oxygen would be furan type carbonyl and aliphatic ethereal forms.
Studies on the Characteristics of Humic Acid and its Utilizations. (Ⅲ) Utilizations of Humic Acid (Nitrohumates)
Won Taik Kim ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 62~67
The adaptabilities of various nitrohumates (-K, -Na and
salt) as a soil conditioner and a raw material for soluble phosphatic fertilizer were studied. 1. Nitrohumates (especially
salt) protect the soil from fissures and control the phosphoric acid adsorptive functions of soils considerably. 2. Most effective nitrohumic acids as a soil conditioner were prepared with 15%
solution composed of five times of original humic acids (by weight) at
for 2 hrs under continuous stirring. 3. When 50% (by weight) of
-nitrohumate were added to apatites in water and boiled for 2 hrs, maximum 26% of
(apatite contains 37% of
) were changed into water soluble forms.
Reaction of Organic Halogen Compounds with Potassium Fluoride. (Ⅲ) Fluorination of Aromatic vic-dihalides
You Sun Kim ; Ki Soo Kim ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 68~74
Flourination of Ethyl,
-phenyl propionate, Ethyl
-phenyl propionate, Ethyl
-(p-chloro-phenyl) propionate, and dibromostyrene by potassium fluoride were investigated in presence of dimethyl formamide, diethylene glycol, and diethylene glycol monomethyl-ether. The reactivity of these organic halogen esters and hydrocarbons towards potassium fluoride was checked further by means of radioactive fluorine-18. tracer. Generally, the reaction gave monofluoride together with dehalogenated olefin. The formation of olefine was increased when the reaction was done at high reaction temperature in presence of diethylene glycol, whereas the lower reaction temperature in presence of diethyleneglycol monomethyl ether favored the formation of mono fluoride in a good yield. The procedures and methods of the identification of monofluorides were described and the feasibility of this reaction of fluorine containing ester including the F-18 labelled compounds was discussed.
Studies on Tropolones (Ⅰ) The Synthesis of 4-Ethyltropolone from Cyclopentadiene and Its Spectroscopic Characteristics
Jae Hu Shim ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 75~82
4-Ethyltropolone has been prepared in three steps from cyclopentadiene by a dichloroketene process, and at the same time, a comparison has also been made with the case of tropolone synthesis. In the addition reaction of dichloroketene to cyclopentadiene as well as to ethylcyclopentadiene, and also in the separation of cycloadducts from reaction mixture, the best results were given by prevention of the reactants from dimerization. Under these condition, the yields of cycloadducts were around 70% for both. Tropolone and 4-ethyltropolone were obtained in the yield of 51% and 32%, respectively, by hydrolysis of cycloadducts with potassium acetate in aqueous acetic acid. These results revealed that the steric effect of ethylgroup was more sensitive to the hydrolysis than to the cycloaddition reaction. A comparison of UV, IR and NMR spectroscopic results of 4-ethyltropolone with those of tropolone was also made together with a brief discussion of the tropolone ring system and ethylgroup effect.
Studies on Tropolones (Ⅱ)
-Methyltropolone Synthesis and Its
Jae Hu Shim ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 83~88
By the three-step synthesis of alkyltropolone from five-membered cyclopentadiene, as described in Part Ⅰ, methyltropolone has been prepared. From the hydrolysis product of dichloroketene-methylcyclopentadiene cycloadduct,
-methyltropolone (Ⅱ) were separated, with the first predominating, by means of repeated fractional recrystallization and fractional vacuum sublimation. The total yield of these methyltropolones in the hydrolysis step was about 40%. Comparison of this result with those obtained in part Ⅰ revealed the following order as the relative readiness of their preparation: tropolone > methyltropolone > ethyltropolone. The reason for formation of the isomeric (Ⅱ) was discussed by an interpretation of NMR spectrum of cycloadduct in the unsaturation and methylgroup region.
Studies on Tropolones (Ⅲ) Structures and Reaction Mechanisms of the Adducts of Dichloroketene and Cyclopentadienes
Jae Hu Shim ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 89~95
The structural investigations on the adducts, formed from dichloroketene with cyclopentadiene, methyl and ethylcyclopentadiene, have been carried out by means of infrared and nuclear magnetic resonance spectroscopy and also by their chemical behaviors. It was confirmed by this study that the adducts were formed by 1, 2-cycloaddition reaction and had the fundamental structure of bicyclo [3. 2. 0]-7,7-dichloro-2-heptene-6-one. These results were well agreed with the hypothesis that a diradical intermediate was formed as the first step in 1, 2-cycloaddition. The reaction mechanism for the process in which tropolones were formed from these adducts was also discussed.
Sugar Constituents of Jalapin from Sweet Potato Tubers
SU RAE LEE ; KOO HEUNG CHUNG ; HO SIK KIM ;
Journal of the Korean Chemical Society, volume 13, issue 1, 1969, Pages 96~101
Jalapin purified from the tubers of the sweet potato (Ipomoea batatas) was deacylated and subjected to structural elucidation. Complete and degraded acid hydrolyses indicated the presence of L-rhamnose, D-fucose and D-glucose in the molar ratio of 1: 1: 1 and in the increasing order of acid-stability. While two moles of periodate were consumed per mole of the product, D-glucose survived in the oxidation. The following structure was, therefore, proposed tentatively for the deacylated jalapin: L-