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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 22, Issue 6 - Dec 1978
Volume 22, Issue 5 - Oct 1978
Volume 22, Issue 4 - Aug 1978
Volume 22, Issue 3 - Jun 1978
Volume 22, Issue 2 - Apr 1978
Volume 22, Issue 1 - Feb 1978
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Calculation of the Dipole Moments for Simple Molecules by the Expansion Method for Spherical Harmonics
Ahn Sang Woon ; Park, Byeong Bin ;
Journal of the Korean Chemical Society, volume 22, issue 6, 1978, Pages 357~364
The dipole moments for
, HF, CO, HCHO, HCN, PO,
molecules are calculated, using the method for evaluation of the dipole moment matrix elements by the expansion method for spherical harmonics. The calculated dipole moments in this work are closer to the experimental values than those of the other work.
An Electrochemical and Optical Study on the Corrosion and Passivation of Metals. An Electrochemical and Optical Study on the Passivation Film of Electrolytic Iron
Park Byung So ; Paik Woon-Kie ; Yeo, In Hyeong ;
Journal of the Korean Chemical Society, volume 22, issue 6, 1978, Pages 365~369
Ellipsometric and reflectance measurements were made on an iron surface in a cathodically reduced state and in an anodically passivated state. From the differences in the optical parameters (
, and reflectance) between the reduced (film-free) and passivated (film-covered) states the thickness and optical constants of the surface film were determined. In the passive state at -400 mV vs. SCE in borate-boric acid buffer solution the anodic film had a thickness of about 11
and optical constants of
= 2.8 - 0.8 i. This value indicates a substantial electronic conductivity of the anodic film.
Oxidation Reactions of Carbon Monoxide on NiO and Mn
Choo Kwang Yul ; Boo Bong Hyun ; Chang Sei Hun Se Heon ;
Journal of the Korean Chemical Society, volume 22, issue 6, 1978, Pages 370~379
The specific rate constants for the oxidation reactions of carbon monoxide on a unit catalytic surface area were measured. The catalysts used were NiO made from
, and Mn
made from Mn
. At low pressure the reaction rate was found to be of second order and the activation energies were 12 kcal/mole (on NiO made from Ni
, 17 kcal/mole (on NiO made from Ni
) and 18 kcal/mole (on Mn
). Plausible reaction mechanisms were proposed from the experimentally determined reaction orders.
Adsorption of o-Xylene on Graphite and Aluce
Kim Nak Joong ; Jang Sei Hun ;
Journal of the Korean Chemical Society, volume 22, issue 6, 1978, Pages 380~385
Adsorption isotherms of o-xylene on Spheron 6, a graphitized carbon black, are obtained at various temperatures using a quartz beam microbalance. BET plots are made to estimate the molecular area of o-xylene from these isotherms. On Spheron 6, the molecular area of o-xylene (m.p
) remains constant until the temperature is increased up to
, but increases abruptly between
, and then again remains constant thereafter. These results are interpreted as implying that the adsorbed o-xylene molecules are flatly localized on Spheron 6 with compact packing below
while they gain a rotational degree of freedom around the benzene ring at the higher temperature.
The Kinetics and Activation Energy for the Mutarotation or Optically Active Poly(trans-5-methyl-L-proline
Han Man Jung ;
Journal of the Korean Chemical Society, volume 22, issue 6, 1978, Pages 386~395
The rates of the forward mutarotation of poly(trans-5-methyl-L-proline) in trifluoro-ethanol and of the reverse mutarotation in trifluoroethanol-n-butanol (1:4 v/v) have been measured at a number of temperatures and polymer concentrations. It was found that both mutarotations are of first-order with respect to the polymer concentration. A modified Arrhenius equation to evalute the activation energy was derived for the reaction kinetics, in which the relation between the measured physical properties and concentration, and the order of tle reaction are uncertain. The activation energies for the forward and reverse mutarotation were found to be 32.5 and 33.5 kcal per residue mole, respectively, which are about 10 kcal per residue mole higher than the
for the mutarotation of polyproline (the resonance energy of amide bonds). The excessive quantity of the activation energy was attributed to the steric barrier between carbonyl and methyl groups during the cis-trans isomerization of amide bonds in the polymer.
Determination of Reactivities by MO Theory (ⅩⅡ). Nucleophilic Substitution Reactions of N-Acetylpiperidone
Lee Ik Choon ; Kim Shi Choon ; Lee Suk Kee ; Park Dong Whan ; Jeon Young Gu ;
Journal of the Korean Chemical Society, volume 22, issue 6, 1978, Pages 396~402
MO theoretical studies on the conformation and the acid-catalyzed nucleophilic substitution of N-acetylpyperidone were carried out by EHT, CNDO/2 and the orbital mixing analytical methods. MO calculations show that the most preferred conformation is the half-chair, cis-trans form and the protonation occurs most readily on the acetyl carbonyl oxygen. These results were interpreted in terms of conjugative, electrostatic and steric effect. From orbital mixing analysis, we found also that the reactivity of protonated carbonyl carbon is greatly enhanced due to increase in positive charge (for charge controlled reaction) of the carbonyl carbon atom. Accordingly, the acetyl cleavage will be preferred in the nucleophilic substitution (acid-catalyzed hydrolysis) to the ring cleavage.
Theoretical Study of the Hydration of Collagen
Lee Jong Myung ; Jhon Mu Shik ;
Journal of the Korean Chemical Society, volume 22, issue 6, 1978, Pages 403~411
A theoretical study of the hydration of the model compound of collagen, poly(Gly-Pro-Pro), has been carried out using empirical potential energy functions. The optimum locations and binding energies of water molecules bound to the model compound have been determined by minimizing the interaction energy. The stabilization energy due to the presence of water in the first hydration shell has been evaluated by comparing the internal interaction energies between the different groups of the model compound in its non-hydrated and hydrated states. The different energy components contributing to the overall stabilization are determined and discussed.
Trennung von Uranisotopen durch Ionenaustauscher
Kim, Dong Won ;
Journal of the Korean Chemical Society, volume 22, issue 6, 1978, Pages 412~416
Die Trennung von Uranisotopen im System HCl/Dowex 50W-X8, 200∼400 mesh wurde versucht. Mit einer 1m Kationenaustauschersaule und extrem geringen Stromungsgeschwindigkeiten konnte eine Anreicherung von Uran 234 und Uran 235 in der Losung nachgewiesen werden.
Sensitized Photoisomerization of Benzalpyrrolinones
Park, Y-T. ; D. A. Lightner ;
Journal of the Korean Chemical Society, volume 22, issue 6, 1978, Pages 417~422
Rather than undergo photooxygenation, the Z-configuration benzalpyrrolinones (Z-2, Z-4) photoisomerized to the E-configuration isomers under direct or sensitized irradiation. Rose bengal sensitized photochemical stereoisomerzation of benzalpyrrolinones (Z-2, Z-4 and E-2) with monochromatic light (at 557 nm, excitation of rose bengal only) showed that the triplet of benzalpyrrolinones was involved in the photoisomerization, since oxygen inhibited the photoisomerization.
The Initiation Mechanism in the Polymerization of Trioxane with Titanium Tetrachloride
Han Man Jung ;
Journal of the Korean Chemical Society, volume 22, issue 6, 1978, Pages 423~430
The initiation mechanism of trioxane polymerization catalyzed by Ti
in nitrobenzene was investigated. The kinetic studies revealed that the rate of polymerization was drastically decreased by the addition of a minute amount of water or methanol. A third substance as cocatalyst was not required for the polymerization. Measurements of dielectric constants gave no evidence for the zwitterionic mechanism of the polymerization. The electric conductivity measurements of polymerization system and the initiator solution showed that the initiation was started by Ti
cation, formed by a disproportionation of the initiator in nitrobenzene.
Study of the Combining Rules Using the Electron Gas Model Intermolecular Forces
Kim Yung Sik ; Lee Hee Chun ;
Journal of the Korean Chemical Society, volume 22, issue 6, 1978, Pages 431~434