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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Chemical Society
Journal Basic Information
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
Selecting the target year
A Study on the Catalytic Oxidation Reaction of Carbon Monoxide with Nickel Oxide
Jae Shi Choi ; Keu Hong Kim ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 241~247
The catalytic reaction between carbon monoxide and oxygen was investigated with the various nickel oxide catalysts at different partial pressures of carbon monoxide and oxygen and at reaction temperatures in the region of 120
. The reaction has the highest rate with the nickel oxide catalyst which is sintered at low temperature. A reaction mechanism to explain the data is derived. From the Arrhenius equation, the activation energies in the region of experimental temperatures are found to be from 5.49 to 9.15 kcal/mole. The concentration of excess oxygen in the nickel oxide seems to vary according to the sintering temperatures and periods and is the controlling factor in determining the type of kinetics followed by the catalytic reaction.
Daytime and Nighttime Photochemical Reactions of the Pure Oxygen System
Kwnag Sik Yun ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 249~261
Studies of photochemical reactions of the pure oxygen atmosphere are made using reaction rate constants and atmospheric data available in the latest literature. The daytime and nighttime variations in atomic oxygen and ozone are computed, based on three different conditions: 1) photochemical equilibrium, 2) direct integrations of the rate equations with modifications and approximation to the equations, and 3) by numerical integrations. The departure from the photochemical equilibrium concentrations during day and nighttime are discussed by comparing the results obtaind from the three conditions.
A New Approach to Significant Liquid Structure for Chemical Kinetics in Liquid Phase
Hyungsuk Park ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 263~272
Determination of Reactivities by Molecular Orbital Theory (I) Theoretical Treatment on the Photochemical Reaction of Benzene and Maleic Anhydride
Myung-Hwan Whangbo ; Ikchoon Lee ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 273~280
The MO's of maleic anhydride are calculated using the parameter values,
= 0.8, and
. With these MO's the interaction energies of the photochemical reaction of maleic anhydride (MA) with benzene are calculated using intermolecular orbital theory. It is shown that there are cases where the interaction energy includes a constant term and this term takes a great role in the photochemical interaction energy, and that with the calculated interaction energies the reaction mechanism is quite well explained. And it is proved that the photochemical reaction is possible for the second addition step of MA to benzene, and that the MA-benzene adduct should have the well-known stereochemical structure.
Determination of Nucleophilic Reactivity by PMO Method (I) Kinetic Studies on the Chloride Exchange Reactions of Arylmethylchlorides in Dry Acetone
Bon-su Lee ; Ikchoon Lee ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 281~287
Rate constans for the chloride exchange of some arylmethylchloride in dry acetone have been determined, and activation parameters have been evaluated. The reactivities of substates are explained with perturbational molecular orbital (PMO) method and HSAB principle. It was found that carbon-chlorine resonance integral at the transition state is a out 67% of
, the carbon-carbon resonance integral.
The Kinetics and Mechanism of Nucleophilic Addition of Ethylmercaptan to Ethylcinnamate
KI-SUNG KWON ; TAE-RIN KIM ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 289~296
The rate constants for the addition reaction of ethylmercaptan to ethylcinnamate has been measured by iodometry and for the proposed reaction mechanism a rate equation which can be applied over wide pH range was derived. From this rate equation, one may conclude that the reaction is started by addition of ethylmercaptan molecule below pH 3. However, above pH 7, this addition reaction is proceeded by the ethylmercaptide ion. At pH 3-7, the complex addition reaction mechanism can also be revealed by this rate equation
Extrathermodynamic Relationships for the Nucleophilic Addition Reaction of Mercaptan to a Carbon Double Bond
OK-HYUN PARK ; TAE-SUP UHN ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 297~302
The activation parameters for the nucleophilic addition reactions of n-propyl-, n-butyl-, n-amyl-and n-hexyl-mercaptan to 3, 4-methylene-dioxy-
-nitrostyrene were determined at pH 5.8 and pH 2.0, and also the isokinetic temperature of the reactions at pH 5.8 was obtained numerically 262
K, and at pH 2.0, 17.1
K. From the values obtained above, the fact that the mercaptan having the longer carbon chain has the greater nucleophilicity of it in the addition reactions has been discussed by the extrathermodynamic analysis of
Polarographic Study of Nitrosophenylhydroxylamine
Jung-Eui Hwang ; Chong-Jae Chung ; Moo-Young Son ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 303~307
The ammonium salt of Nitrosophenylhydroxylamine "called cupferron", is a well-known analytical reagent, which precipitates a great number of metal ions in acid medium. The electrode reduction velocities of cupferron at droping mercury electrode in various supporting electrolytes were measured by Delahay method. The free energy of activation and transfer coefficient for a given electrode reaction are computed from the corresponding current-voltage curve. The number of electrons involved in the rate determining step of the reduction of cupferron is calculated for solutions of various pH.
Study on the Coordination Polymers of Metal (II) Ions with 2,5-Diamine 1,4-Dihydroxybenzene
Joon Suk Oh ; Kyun Ok Cho ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 309~312
A series of metal ion-2, 5-diamine 1, 4-dihydroxybenzene polymers containing copper(II), nickel(II) or cobalt (II) have been prepared. The structure was postulated on the basis of elementary analysis of polymers. It was found that copper polymer is most likely the coordination polymers by X-ray powder pattern studies. The thermal stability of the polymers was also studied by a simple method, utilizing a thermogravimetric balance. The order of thermal stabilities is Cu(II) > Ni(II) > Co(II). The polymers start to decompose at a relatively low temperature.
A Simple EDTA Titration Method for the Determination of Lead in Monazite
Chul Lee ; Won Ji Cho ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 313~316
In this paper a simple and rapid method is described for the determination of lead in monazite. A monazite sample was dissolved with hot concentrated sulfuric acid and diluted to 200 ml with distilled water. Lead is quatitatively separated by coprecipitating with strontium. Lead-strontium sulfate is dissolved in 3N NaOH soluion. An excess Zn-EDTA is added. The remaining zinc ion is titrated with standard 0.01 M EDTA solution using xylenol orange as indicator at pH 5 in the presence of KCN and acetyl acetone as masking agents.
Studies on the Isopolytungstic Acid and Isopolytungstates
Bong-Kul Kim ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 317~324
Isopolytungstic acid and it's salts, which are formed in sodium tungstate solutions, when acidified with perchloric acid, have been investigated by cryoscopic method. The results obtained are summarized as follows; It was not possible to measure the molecular weight of sodium isopolytungstates which are salthydrates, by means of cryoscopic method. Regardless of the concentration of solution, paratungstate and acid hexatungstate are formed at
ratio of 1.15 and 1.50. It has been shown that isopolytungstic acid and it's salts are also formed at
ratio of 1.30 and 1.90 and in highly concentrated solutions at 1.40 and 1.65.
The Darkening Effect of Phytosterylferulate on the Rice Bran Oil
Jum Sik Kim ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 325~332
An attempt has been made to investigate the nature of the characteristic darkening reaction occurring in the rice bran oil during the storage. Several pigments were separated by using column and thin layer chromatography of the pigments was made in the light of the knowledge of absorption spectral behavior. The presence of trace amount of iron and phytosteryl esters of ferulic acid (3-methoxy-4-hydroxy-cinnamic acid) was found to be responsible for the development of the characteristic color in rice bran oil. The model reactions with the ferulate, iron and fatty acids could be suggested the mechanism.
Synthesis and Study of the Chemical Properties of 1,4-Bisdiazo-2-butene
Hak-Ki Lee ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 333~339
Synthesis and chemical properties of 1,4-bisdiazo-2-butene have been studied. 1,4-Bisdiazo-2-butene which was very unstable produced in protic solvents 1,3-butadiene and one unidentified substance instead of ring compounds. The reaction in aprotic solvents remains for further investigations.
Studies on the Strained Ring Compound System (I) The Base-Induced Pyrolysis of 2-Butenedial Distosylhydrazone
Hak-Ki Lee ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 341~346
The synthesis and pyrolysis of trans-2-butenedial ditosylhydrazone with sodium methoxide in aprotic solvents have been studied to investigate the products of pyrolysis. The pyrolysis of dry lithium salt of tosylhydrazone also has been made, one of its products was acetylene which might come from a certain strained ring compound.
Studies on the Strained Ring Compound System (II) The Formation of Tetrahedrane in the Pyrolysis of 2-Butenedial Ditosylhydrazone
Hak-Ki Lee ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 347~353
trans-1, 4-Dideutero-2-butenedial ditosylhydrazone has been synthesized to investigate the path of the acetylene formation in the pyrolysis of the dry lithium salt. Mass spectra showed that three isotope isomers of acetylene which might come from the strained ring compound, tricyclo[1, 1, 0,
Ancestral Remnants in the Deoxyribonucleic Acid from Pseudomonas
J. De Ley ; In Won Park ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 355~364
Cross-hybridizations between DNA of two pseudomonads and a xanthomonad suggested that the three DNA types had a considerable section in common. The existence of this common part was proved by hybridization of preselected DNA, i.e. DNA resulting from a previous hybridization between any one set of two DNA types, with the third type. It was thus shown that about 50% of the DNA of the three organisms was similar. This common part was isolated in pure state and its % (G+C) was found to be indentical to the overall base composition of the native DNA. The evolutionary drift in % (G+C) could thus not be detected. The total molecular weight of the chromosornal DNA/bacterial nucleoid was determined to be 2.4
daltons. It can therefore be estimated that the common putida-fluorescenspelargonii DNA part consists of some 2,000 cistrons. P. putida and P. fluorescens share an additional 1,300 cistrons, and all xanthomonads share at least an additional 1,000 cistrons.
Graftpolymerization of Methacrylamide onto Silk
Jyong Sup Shim ; Young Duk Kim ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 365~371
Studies on Copolymerization of Acrolein with Styrene, Methyl methacrylate and Vinyl acetate
Jyong Sup Shim ; Young-Sung Jun ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 373~377
In order to determine the monomer reactivity ratio in copolymerization of acrolein, the copolymerization of acrolein with styrene, methyl methacrylate and vinyl acetate respectively was studied. The Q and e value of acrolein in each copolymerization were also calculated from those of monomer reactivity ratios, but the calculated values were slightly different from each other. The Q and e of acrolein for the system of acrolein-styrene copolymerization were Q = O.64 and e = O.62 respectively. Relations among the Q and e value, the composition and structure of copolymers and the mean sequence length in copolymerization were also discussed for acrolein copolymers.
Synthesis and Photosensitivities of Polyethylene Maleate and Epoxy Resin Cinnamate
Jyong Sup Shim ; Hong Soo Park ; Sung Il Hong ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 379~386
Polyethylene maleate (PEM) and epoxy resin cinnamate (BEC) were prepared to investigate their photosensitivity. Various samples coated on glass plate were exposed to light under various conditions and steeped in the same solvent as used for coating, and then the yield of residual film (W/
) was calculated. The yield (W/
), which was closely related to the sensitivity of the film, was affected by the degree of polymerization of the film, light source, sensitizers land their concentration. In polymer homologs, the sensitivity depended upon degree of polymerization. Most effective sensitizers for PEM and BEC among those used here were benzanthrone and 2,6-dichloro-4-nitroaniline.
Copolymerization of Phenyl Acetylene with Styrene
Hyung Chick Pyun ; Jaerok Kim ; Woong-Moo Lee ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 387~393
Gamma-ray induced copolymerization of phenyl acetylene with styrene is compared with that of the Ziegler catalyzed. The reactivity of styrene is greater than that of phenyl acetylene in the gamma-ray induced polymerization but much less than that of phenyl acetylene in the Ziegler catalyzed. The resulting copolymer is identified by means of DTA and spectrophotometry. Further, the liquid scintillation counting of styrene-
clarified the relative composition of the copolymers.
On the Relation Between the Crystallite Diameters and the Physical Properties of Soft and Hard Carbons by Heat Treatment Temperature
Ju Seong Lee ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 395~399
On the soft carbon made from petroleum coke, it was found that the graphitization began at around 2,000
and crystallite diameters were almost saturated at 2,400
., and that the molecular planes were difficult to arrange into an ideal graphite lattice in spite of the saturation of crystallinity by heat treatment temperature. On the hard carbon made from cross-linked thermosetting plastics, phenol-formaldehyde filler and phenol-benzaldehyde binder, it was very difficult to rotate the molecular planes into a regular directional arrangement and into a consecutive order corresponding to the large graphite crystals. In addition to the above mentioned crystallinity, it was also determined in relation to electric conductivity, resistivity, hardness and apparent density of carbons.
Investigation of the Water Quality in the Naktong River Basin(I)
Won Kyu Park ; Yung Kyu Park ; Jong Duck Suh ;
Journal of the Korean Chemical Society, volume 13, issue 4, 1969, Pages 401~407
The results of water analysis for 10 stations in the main Naktong and 11 stations in the tributaries from March to December 1968 are as follows: The water quality of the Naktong River Basin is generally the frist class of water, especially the tributaries, Hwang river, Nam river, Milyang river, Naesongchun, Hoechun, Wichun and Panbyunchun were dissolved in less than 100 mg/l as the amount of the total ion of the main component. In comparison with river discharge, the amount of the total ion of the main component is decreased in June and July, because of the river discharge is increased in those periods. According to the measurement of the conductivity and the hardness, the better water quality is distinguished by the following order: lower part of river (Namji), middle part of river (Waegwan), upper part of river (Yean). The conductivity of Kumho river, Tongchon is higher than the middle part of the main river and Nam river, Chongam is smaller than lower part of the main rivller. The variation of the amount of the total ion of main component in the basin is mainly effected by
. The relationship between
mg/l .The main river was much contaminated by Kumho river and C.O.D. at Gang-chung, Kumho river in June was recorder over the standard about 7 times.