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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 31, Issue 6 - Dec 1987
Volume 31, Issue 5 - Oct 1987
Volume 31, Issue 4 - Aug 1987
Volume 31, Issue 3 - Jun 1987
Volume 31, Issue 2 - Apr 1987
Volume 31, Issue 1 - Feb 1987
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Semi-Empirical MO Calculations and Infrared Spectroscopy of Hydrogen-Bonding in Alkyl Alcohols
Jong Taik Kim ; Doo Seon Park ;
Journal of the Korean Chemical Society, volume 31, issue 1, 1987, Pages 3~13
Infrared absorption spectra of alkyl alcohols in the OH stretching region were obtained from varying the concentrations of alcohols in
. The OH stretching bands were broadened and shifted to lower frequencies due to the hydrogen-bond formation. Three bands were obtained from the breakdown of these bands by the simplex method. Each band was assigned to various types of hydrogen-bonded OH groups. The electronic structures and interaction energies of dimeric and trimeric alcohols were calculated by semi-empirical MO(CNDO/2, INDO) methods. These results were in good agreement with those of deconvoluted ir spectra. The EDA(electron donor-acceptor) effect of alkyl group on hydrogen-bond formation was in the decreasing order of butyl > propyl > ethyl > methyl group. On the other hand, the experimental results were in the order : propyl > ethyl > butyl > methyl group. This seemed to be ascribed to the bulkiness of butyl alcohol.
CNDO / 2 MO Calculations for the Electronic Structure of Silicas and Zeolites Ⅰ. Adsorbed Carbon Monoxide
Jong Taik Kim ; Doo Seon Park ;
Journal of the Korean Chemical Society, volume 31, issue 1, 1987, Pages 14~24
The CNDO/2 method has been used to calculate the electronic structure of the zeolites and silicas, and to investigate the interaction of CO molecules with the OH groups or the exchanged cation in the zeolites. The interaction energies of CO molecules with OH groups in silica were ca. 12kcal/mol, the bond distance, R(O-H
C) was 2.6
. The strength of bond between CO molecules and various types of cations in the zeolites was in the following order: $H^+ < Na^+ < Li^+$, i.e., this increased with increasing electrostatic field of cations. The bond orders of CO molecules interacting with the OH groups or the cations increased but for the OH-OC type interaction. The theoretical decationization energies of exchanged cations in the zeolites decreased in the order: $H^+ > Li^+ > Na^+$. And these energies depended on the amount of charge density transfered from the skeleton to the cations in order to compensate its negative charge.
혼합용매에서의 용매화 (제 5 보) : 메탄올-아세톤 혼합용매계에서 tert-Butyl Halides와 1-Adamantyl Tosylate의 가용매 분해반응
Ikchoon Lee ; Sang-Mu La ; Byung Hoo Kong ; Bon-Su Lee ; Se Chul Sohn ;
Journal of the Korean Chemical Society, volume 31, issue 1, 1987, Pages 25~30
Solvolysis of tert-butyl halides and 1-adamantyl tosylate in methanol-acetone mixtures and solvolysis of tert-butyl bromide in methanol-chloroform mixtures have been studied. Solvent ionizing power of methanol-acetone mixtures were calculated by the Grunwald-Winstein equation and discussed the Y value variation caused by substrate changes. Y values based on 1-adamantyl tosylate is superion to others since it varies in wide range for methanol-acetone mixtures. It was found that the order of electrophilic assistance to leaving group is OTs > Cl > Br > I.
Studies on Chromatographic Behaviors of the Metal Complexes by Various Eluents
Chang Eon Oh ; Doo Cheon Yoon ;
Journal of the Korean Chemical Society, volume 31, issue 1, 1987, Pages 31~36
We examined eluting behaviors for cationic complexes with the eluting cations. Retention volumes of hydrophilic complexes when eluted by the high concentration of aqueous KCl, NaCl and $NH_4Cl solutions, have been increased in the order NH_4^+ > Na^+ > K^+$, but in the low concentration, retention volumes of hydrophilic complexes bave been increased in the order $Na^+ > NH4^+ > K^+$. On the order hand, retention volumes of hydrophobic complexes when eluted by aqueous KCl, NaCl and $NH_4Cl solutions, have been increased in the order NH_4^+ > Na^+ > K^+$ in the whole concentration range. And we examined eluting behaviors for cationic complexes with the eluting anions. Hydrophilic complexes were associated more strongly with chloride ion among halide ions. However, hydrophobic complexes were associated more strongly with iodide ion. Sulfate ion, a highly hydrated anion, was associated more strongly with hydrophilic complexes than with hydrophobic complexes.
The Effect of Pressure and Catalyst on the Rate of Solvolysis of Chloro-cobalt (Ⅲ) cation in Binary-Aqueous Mixtures (Water-methyl Alcohol, Water-Acetone, Water-Isopropyl Alcohol and Water-Ethylene Glycol)
Yu-Chul Park ; Zun-Ung Bae ; Sang-Woong Kim ;
Journal of the Korean Chemical Society, volume 31, issue 1, 1987, Pages 37~44
The rates of solvolysis of
complex have been investigated using spectrophotometric method at various pressures up to 1500 bar in several binary-aqueous mixtures(water-methyl alcohol, water-acetone, water-isopropyl alcohol and water-ethylene glycol). The activation volumes obtained from the pressure effect on rate constants were 1.13∼4.44 cm3mole-1 for methyl alcohol, 1.13∼3.59
for acetone, 0.82∼3.44
for isopropyl alcohol and 1.13∼2.68cm3mole-1 for ethylene glycol. In case of water-methyl alcohol, in addition to, the rates of solvolysis of this complex were determined in the presence of Fe(Ⅱ) ion and the activation volumes were -0.56∼1.59cm3mole
. The rates of solvolysis of this complex were analyzed by comparing with the results obtained from activation volumes and free energy cycle.
Selective Separation and Determination of Iron with Ion-Exchange Resins
Yong Soon Chung ; Dong Won Kim ; Seung Ho Kim ; Dai Woon Lee ;
Journal of the Korean Chemical Society, volume 31, issue 1, 1987, Pages 45~54
Dowex 1-X8 resin ion exchanged with calcon carboxylic acid (CCA-Dowex 1-X8) and 2-methyl-8-hydroxyquinoline(MHQ) impregnated-Amberlite XAD-4 resin (MHQ-XAD-4) were examined for the separation and preconcentration of ferric ion from the various matrices. The stabilities of these resins were investigated, and their capacities on ferric ion were also measured. The effect of pH on the adsorption of ferric ion and matrix ions, such as Al(Ⅲ) and Ca(Ⅱ), was investigated to determine the optimun pH ranges. Separation and preconcentration of iron in aluminium foil and mineral water samples were studied by elution method with these resin columns. The recovered ions by 10ml of 2F nitric acid was determined by flame atomic spectrophotometry. SP-Sephadex C-25 column was used to separate ferrous and ferric ion in mineral water by stepwise elution with ferrozine and 1 % ascorbic acid-ferrozine solution. The concentrated and separated each ion could be determined spectrophotometrically at the analytical wavelenth of Fe(Ⅱ)-ferrozine complex (562nm).
A Study of the Retention Mechanism of the Monosubstituted Benzenes in Reversed-Phase Liquid Chromatography (Ⅰ). The Elution Behavior of the Monosubstituted Benzenes
Dai Woon Lee ; Yong Wook Choi ; Hyun Joo Kim ; Yong Soon Chung ;
Journal of the Korean Chemical Society, volume 31, issue 1, 1987, Pages 55~63
The systematic investigation of the retention behaviors of 18 monosubstituted benzenes in reversed-phase liquid chromatography(RPLC) was studied in order to predict the separation possibility of their mixtures and study the contribution of substituent group to the retentions of solutes. The columns and mobile phases employed in this study were
-Bondapak phenyl columns and methanol/water, acetonitrile/water, and THF/water, respectively. The polar substituents such as phenol, aniline, acetophenone and benzonitrile have smaller capacity factor(k') values than benzene, while nonpolar ones such as alkylbenzenes and halobenzenes show larger k' value. The capacity factors of all solutes increased on both C18 bonded and phenyl bonded phases as the organic solvent content of three organic solvent-water mixtures decreased. The absolute differences in capacity factor(
') between substituent and benzene were graphically shown for the prediction of the separation of the mixture and interpretation of the elution behavior of substituent. In addition, the selectivity of solvent system for the separation of the mixture was investigated in both two columns and three mobile phases.
The Determination of Rare Earth Oxides by X-Ray Fluorescence Spectrometry Using Empirical Coefficient Method
Young Man Kim ; Beom Suk Choi ; Sun Tae Kim ; Chong Wook Lee ;
Journal of the Korean Chemical Society, volume 31, issue 1, 1987, Pages 64~70
Rare earth elements including Y and Th in the monazite were separated and determined by X-ray fluorescence spectrometry. The matrix effects among the rare earth elements were simultaneously corrected by means of empirical coefficient method. The values of the coefficients were quite dependent on the number of the standards. However, the different set of coefficients led to the same results. The analytical results corrected by the present method agreed with those by the inductively coupled plasma spectrometry.
Construction of a General Purpose Data Acquisition System
Euijin Hwang ; Hasuck Kim ;
Journal of the Korean Chemical Society, volume 31, issue 1, 1987, Pages 71~78
A simple and inexpensive digital data acquisition system for general use in chemical laboratory was constructed. Since the system has its own 12-bit 4K memory, it can be used by itself to capture the fast signals. The system can also be used with Apple Ⅱ+ microcomputer for acquisition and processing of data.
Reactions of Trimethyl-and Triphenyl-Metal(Ⅳ) Methoxide with Phenylisocyanate
Ghap-Ju Kim ; Bae Seok Seo ; Myung Jae Lee ; Sung Woo Park ; Il-Kyu Lee ;
Journal of the Korean Chemical Society, volume 31, issue 1, 1987, Pages 79~83
Trimethyl-and triphenyl-metal (IVA) methoxides were reacted with phenylisocyanate at various temperatures. Even at 100
, methyltrimethylsilyl ether, methyltriphenylsilyl ether and triphenyltin methoxide produced the cyclic dimer of phenylisocyanate, N,N'-diphenyluretidine-2,4-dione. But the other compounds produced only the cyclic trimer of phenylisocyanate, phenylisocyanurate. And above 200
, considerable amounts of diphenylcarbodiimide was formed by all the organometallic compounds. From these results, the mechanism of cyclic polymerization of phenylisocyanate by the organometal catalysts, and the correlation of substituents with the reactivity were discussed.
Chemical Synthesis of Oligodeoxyribonucleotide ; Improvement of Deoxyribonucleoside Phosphorylation and Dideoxyribonucleotide Synthesis
Sang Jik Lee ; Byung Soo Song ; Jong Dae Kim ;
Journal of the Korean Chemical Society, volume 31, issue 1, 1987, Pages 84~93
The study was done with a focus on making the optimum condition on phosphorylation of deoxyribonucleoside with o-chlorophenylphosphoroditriazole as a phosphorylating agent. The result showed that the addition of 5 volume % pyridine to the dioxane solution accelerated the rate of reaction to a great extent and turned out to nearly quantitative yields on phosphorylation. On the basis of this improvement of optimum reaction conditions, a more efficient method to synthesize all-protected dideoxyribonucleotide from N, 5-O-blocked deoxyribonucleoside was developed. The dodecamer with a Hind Ⅲ recognition site was readily synthesized from five different dimers which were prepared through the newly improved method.
Reaction of p-Bromophenacylamines with Potassium Cyanide and Ammonium Carbonate
Soon-Kyong Kwon ; Kyoung-Hee Lee ;
Journal of the Korean Chemical Society, volume 31, issue 1, 1987, Pages 94~97
In a converting reaction of
(1b) with KCN and
, to hydantoin, the expected 5-(p-bromophenyl)-5-diethylaminomethylhydantion (2a) and 5-(p-bromophenyl)-5-piperidinomethylhydantoin (2b) were not formed. Diethylaminomethyl group and piperidinomethyl group were eliminated and p,p'-dibromodiphenylhydantil (4), which might be formed through dimerization of 5-(bromophenyl)-hydantoin (3), and p-bromobenzoic acid (5), which was formed through a degradation of 5-(bromophenyl)-hydantoin, were obtained. In the case of
(1c), the expected 5-(p-bromophenyl)-5-morpholinomethylhydantoin (2c) was formed.
Synthesis and Polymerization of A New Spiro-ortho Carbonate
Kwanghyun No ; Younhee Kim ; Dongkuk Kim ;
Journal of the Korean Chemical Society, volume 31, issue 1, 1987, Pages 98~101
A new spiro-ortho carbonate containing bulky side group, 3,9-di-(9,10-dihydro-9,10-ethanoanthracenyl)-1,5,7,11-tetraoxaspiro-5,5-undecane 4 was prepared and polymerized with BF3
etherate as initiator. Densities of monomer and polymer were measured using dilatometer and it was demonstrated that the bicyclic monomer 4 underwent expansion on polymerization.
Characteristics of Transparent and Conducting Tin Oxide Film
Chang Sup Ji ; Tak Jin Moon ; In Hoon Choi ; Dok Yol Lee ;
Journal of the Korean Chemical Society, volume 31, issue 1, 1987, Pages 102~109
Some characteristics of
film which was deposited on a slide glass substrate, using dibutyl tin diacetate and oxygen, by the chemical vapor deposition were observed. The optimum condition for the preparation of the film was found to be at 420
of substrate temperature for 20 min of deposition. Important optical, electrical, and structural features of the film were examined. It was found that the typical
film on the untreated substrate was 4000
in thickness, transmitted 90% of the visible liglit, and provided 5800 ohms/
of the sheet resistance. It was also found that the surface treatments of the slide glass by acid leaching were beneficial. The film structure was found to be a mixture of polycrystalline tetragonal stannic oxide confirmed by the X-ray diffraction and to be spherical fine grains concluded by the scanning electron microscopy.
Linear Low Density Polyethylene Preparation by Titanium-Based Ziegler-Natta Catalysts
Dong-Ho Lee ; Kyung-Eun Min ; Cha-Ung Kim ;
Journal of the Korean Chemical Society, volume 31, issue 1, 1987, Pages 110~117
For the preparation of linear low density polyethylene (LLDPE), the copolymerization of ethylene and 1-butene was carried out with various catalysts of titanium alkoxidealkylaluminum compound in slurry phase. The effects of catalyst components, aging time, concentration of catalyst components, polymerization time and temperature on the catalytic activity and copolymer composition were examined. The properties of copolymer obtained were also considered with the correlation to the 1-butene contents. It has been found that the titanium tetra-n-butoxide-diethylaluminum chloride catalyst system was the most suitable for the production of LLDPE with higher catalytic activity, more 1-butene content and less soluble parts. The density, glass transition temperature, melting point and heat of fusion of copolymer were decreased with increasing 1-butene contents.
The Crystal Structure of Hemipentapotassium Hemiundecahydrogen Hexatungstoplatinate (IV) Dihydrate,
UK Lee ; Yukiyosihi Sasaki ;
Journal of the Korean Chemical Society, volume 31, issue 1, 1987, Pages 118~120