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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 27, Issue 6 - Dec 1983
Volume 27, Issue 5 - Oct 1983
Volume 27, Issue 4 - Aug 1983
Volume 27, Issue 3 - Jun 1983
Volume 27, Issue 2 - Apr 1983
Volume 27, Issue 1 - Feb 1983
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The Effects of the cis and trans Configurations of Ligands on the Calculated Dipole Moments for
Sangwoon Ahn ; Eu Suh Park ; Chang Jin Choi ;
Journal of the Korean Chemical Society, volume 27, issue 2, 1983, Pages 83~94
The effects of cis and trans configurations of ligands for
type complexes [M(II) = Co(III), Ni(II) and Cu(II)] on the calculated dipole moments have been investigated, adpoting the eigenvectors of EHT calculation. The calculated dipole moments for cis complexes are higher than those of trans complexes. The calculated dipole moments for the octahedral trans
type complex fall in the range of experimental values. However the calculated dipole moments for cis
type complexes fall in the range of the experimental values. These results predicts the trans structure for
type complexes. Those structures are in agreement with the experimental one (Three bidentate (O-N) ligands in
type complexes coordinate to the metal ion and two tridentate (O-N-N) ligands in [Ni(II)O2N4] type complexes coordinate to Ni(II) ion).
Solvolysis of Benzoyl Cyanide
Jeong Wha Kim ; Ikchoon Lee ; Se Chul Sohn ; Tae Sup Uhm ;
Journal of the Korean Chemical Society, volume 27, issue 2, 1983, Pages 95~101
The pseudo-first order rate constants have been obtained for the solvolysis of benzoyl cyanide in various aqueous solvent mixtures and ethanol-trifluoroethanol mixtures at 1, 5, 10, 15 and
. Values of n in the Kivinen polt, m values of Grunwald-Winstein polt,
values of Leffler relationship and values of m and l in the extended Grunwald-Winstein polt have been calculated and studied the transition state variation caused by solvent changes using the More O'Ferrall polt and quantum mechanical approach. It has been shown that the reaction proceed via the associative
mechanism, using the transition state parameters and quantum mechanical model approach.
The Effect of Pressure and Temperature on the Benzene-Iodine Charge Transfer Complex in n-Hexane
Oh Cheun Kwun ; Jeong Rim Kim ;
Journal of the Korean Chemical Society, volume 27, issue 2, 1983, Pages 102~110
The effect of pressure and temperature on the stabilities of the benzene-iodine charge transfer complex have been investigated through ultraviolet spectrophotometric measurements in n-hexane. The stabilities of the complexes were measured at temperatures of 25, 40 and
up to 1600 bars. The equilibrium constant of the complex formation was increased with pressure and decreased with temperature raising. The absorption coefficient was increased with both pressure and temperature. Changes of volume, enthalpy, free energy and entropy for the formation of complexes were obtained from the equilibrium constants. The red-shift at a higher pressure, the blue-shift at a higher temperature and the relation between pressure and oscillator strength were discussed by means of thermodynamic functions.
A Study on the Tungstate-Sensing Electrodes
Gwon-Shik Ihn ; Jung-hwa Lee ; R. P. Buck ;
Journal of the Korean Chemical Society, volume 27, issue 2, 1983, Pages 111~116
electrodes have been prepared and evaluated for sensitivity to tungstate. The 51.71 : 16.64 : 31.65(w/w%) composition is superior in terms of potentiometric response, stability, rapidity of response and reproducibility. Testing was done over the concentration range
buffer at pH 8.00 with constant ionic strength. The quality of response is similar to that of corresponding phosphate-sensing electrode. Many common ions interfere.
Carbon-13 and Vanadium-51 Nuclear Magnetic Resonance Studies of Vanadium(v)-Aminopolycarboxylic Acids (Ⅰ)
Man-Ho Lee ; Tae-Sub O ;
Journal of the Korean Chemical Society, volume 27, issue 2, 1983, Pages 117~126
NMR spectroscopy have been used to study the solution structures of the vanadium (v) complexes formed by ethylenediaminetetraacetic acid (EDTA), trans-cyclohexanediaminetetraacetic acid (CDTA), 1,2-propylenediaminetetraacetic acid (PDTA), ethylenediaminediacetic acid (EDDA), 2-hydroxyethylethylenediaminetriacetic acid (HEDTA), diethylenetriaminepentacetic acid (DPTA), and nitrilotriacetic acid (NTA). All of the complexes probably have octahedral structures containiing cis-
core. The coordination of hydroxylethyl group is found to be less favored than that of acetate group. EDDA forms two isomers,
-cis. PDTA also forms two structural isomers due to the methyl group in the ligand.
Selective Disproportionation of Toluene over Various Cation-exchanged ZSM-5 Catalysts
Jong Shin Yoo ; Byoung Joon Ahn ; Hakze Chon ;
Journal of the Korean Chemical Society, volume 27, issue 2, 1983, Pages 127~132
The catalytic activity of ZSM-5 catalyst for the disproportionation of toluene is dependent on the type of cation exchanged, the degree of ion-exchange and the reaction temperature. The activity increases in the order of alkaline-, alkali earth-, hydrogen, and rare-earth-exchanged ZSM-5 and decreases with increasing degree of cation exchange. Among the ion-exchanged ZSM-5 catalyst, only Cs-ZSM-5 shows predominant selectivity for p-xylene. The selectivity increases with increasing degree of
-exchange and decreasing reaction temperature. This phenomenon is interpreted in terms of shape selectivity arising from the partial blocking of channel intersections by large cesium ions.
Kinetic Studies of the Hydrolysis of 1-Arylpyrrole Imine
Hak-Soo Lyu ; Hee-Ju Chae ;
Journal of the Korean Chemical Society, volume 27, issue 2, 1983, Pages 133~141
The kinetics of the acid-catalyzed hydrolysis of a series of 1-aryl-2-pyrrylideneaniline (3) have been studied in 20% MeOH solution using UV spectrophotometer. Substituents in 3 showed a relatively small effect, with hydrolysis facilitated by electron withdrawing group. By obtaing linear plots of
constants, it was able to show that substituents had a considerable contribution to the aromaticity of pyrrole compounds. The small positive
values were consistent with the rate-determining addition of water to the protonated schiff base in the buffer solution of pH 4 to 8, whereas the addition of water to the free imine seemed to be the rate-determining in the solution of acidities greater than pH 8.
Reaction of Thianthrene Cation Radical Perchlorate with Cumene Hydroperoxides
Jongheon Shin ; Kyongtae Kim ;
Journal of the Korean Chemical Society, volume 27, issue 2, 1983, Pages 142~149
Reaction of thianthrene cation radical perchlorate (1) with cumene (4), p-chlorocumene (2), and p-nitrocumene (3) hydroperoxides in acetonitrile at room temperature afforded, inter alia, thianthrene as a common product and 5-(4'-hydroxyphenyl) thianthrenium perchlorate (5) for 4, 5-(5'-chloro-2'-hydroxyphenyl) thianthrenium perchlorate (7) and 5-acetonylthianthrenium perchlorate (6) for 2 and 6 for 3, respectively. Stoichiometry of these reactions showed that 2 moles of 1 gave rise to 1mole of thianthrene and 1 mole of thianthrenium salt (or salts). Nucleophilic reactivity to 1 was found to be in the order of phenol > > p-chlorophenol
acetone > > p-nitrophenol. Apart from acid-catalyzed heterolytic decomposition of hydroperoxides, small amount of homolytic decomposition products were found from 3 and 4.
Absorption Spectra on Enol Forms of Oxodipyrromethenes and Bilirubin IX-
Yong-Tae Park ; Joon-Kju Park ; Myung-Sub Song ;
Journal of the Korean Chemical Society, volume 27, issue 2, 1983, Pages 150~156
Solvent shift effect on absorption spectra of oxodipyrromethenes and bilirubin IX-
were studied. In methanol or acetic acid the oxodipyrromethenes exist as flat conjugated conformations and in strong acid medium as enol forms of oxodipyrromethenes and bilirubin. The visible absorption bands of bilirubin IX-
and the model compounds, oxodipyrrinethenes, are assigned as
transition due to their large molar absorption coefficients and to the fact that the more alkyl-substituted one absorbs at rather longer wavelengths than less alkyl-substituted one. A weak blue shift of bilirubin IX-
in polar solvent is probably attribute to disruption of intramolecular hydrogen bond.
The Synthesis of Carbamoylsulfenyl Chloride and its Derivatives
Surk Sik Moon ; Dong Young Oh ;
Journal of the Korean Chemical Society, volume 27, issue 2, 1983, Pages 157~164
N-Methylidene-2,6-diethylaniline (III) was prepared by the reaction of 2,6-diethylaniline (II) with an excess paraformaldehyde. The protons of N=
in the compound III exhibited a second order NMR spectrum. The compound III reacted with bifunctional chlorocarbonylsulfenyl chloride(IV) to give N-(chloromethyl)-N-(2,6-diethylphenyl)-carbamoylsulfenyl chloride(V). The reaction of the compound V with various alcohols resulted in the formation of Alkyl N-(chloromethyl)-N-(2,6-diethylphenyl)-carbamoylsulfenate esters(VI
XVI) in 71
95% yields. The compound VI
XVI decomposed gradually, but the thermal rearrangement of S-O bonding to S=O bonding was not found. The nucleophilic attack of an excess alcohol to the compound Ⅴ was made on both divalent sulfur and
-carbon of N-chloromethyl group. The corresponding substituted products(XVII, XVIII) had considerable stability.