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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 36, Issue 6 - Dec 1992
Volume 36, Issue 5 - Oct 1992
Volume 36, Issue 4 - Aug 1992
Volume 36, Issue 3 - Jun 1992
Volume 36, Issue 2 - Apr 1992
Volume 36, Issue 1 - Feb 1992
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Surface Geometry of o-Diiodobenzene Adsorbed on Silver Colloid Surface
Jung Sang Suh ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 169~173
The surface geometry of o-diiodobenzene (ODIB) adsorbed on silver colloid surfaces has been studied. This molecule is standing up on 1 day old colloid surfaces, while it is lying down or standing up on 1 month old colloid surfaces. The surface geometry of ODIB is affected by the atomic scale surface roughness of colloid used. The SERS intensity of ODIB for lying down geometry is much more strong than that for standing up. This may be mainly due to that the distance from surface to the center of the molecule in lying down geometry is shorter than that in standing up.
The Effects of Charge Transfer Complex on the Reaction of Aniline and Iodine
Oh-Yun Kwon ; U-Hyon Paek ; Eung-Ryul Kim ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 174~179
Reaction of aniline and iodine in
(1 : 1), and
has been studied kinetically by using conductivity method, Pseudo first-order rate constants (
) and second-order rate constants (
/[aniline]) are dependent on the aniline concentration. Second-order rate constants obtained were increased with increasing aniline concentration. We analysed these results on the basis of formation of charge transfer complex as reaction intermediate. From the construction of react ion scheme and derivation of rate equation, we calculated equilibrium constants and activation parameters for the formation and transformation of charge transfer complex. The equilibrium constants were decreased by an increase in the dielectric constant of the solvent and the value is 1.7-3.7
. The rate of transformation are markedly affected by the solvent polarity.
is about 14.2kJ/mol, and
is large negative value of -243J/mol K.
The Effect of Pressure on the Reaction of p-Substituted Benzoyl Chlorides with Pyridine
Young Cheul Kim ; Jin Burm Kyong ; Se Kyong Kim ; Deog Ja Koo ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 180~184
Kinetic studies for the reaction of pyridine with substituted benzoyl chlorides were conducted under various pressures (1-1000 bar) in acetonitrile. From rate constants, the activation parameters (
) were evaluated. Rates of these reaction increased with an increase in the pressure. The activation volume, the activation compressibility coefficient and the activation entropy were negative. From substituents effect and these results, it was found that these reactions proceed through
mechanism, but the structure of transition state was slightly changed with substituents and pressure.
Hydrogen Bonding between Thioamides and Dimethylsulfoxide (DMSO) in
Young-Lac Do ; Seon-Jin Kim ; Chang-Ju Yun ; Young-Sang Choi ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 185~190
Near-IR spectra for
+ Amide Ⅱ combination band of thioamides, and very dilute thioamide-DMSO solution in CCl4 were recorded in the temperature range of
. This combination band was resolved by the computer program into two Lorentzian-Gaussian product function which have been identified with monomeric thioamide and thioamide-DMSO 1 : 1 complex. Equilibrium constants and thermodynamic parameters for the thioamide-DMSO hydrogen bonding were elucidated by the analysis of conce ntration and temperature dependent spectra. The hydrogen bonding strength between thioacetamide (TA) and DMSO in
is stronger than that between thiopropionamide (TPA) and DMSO in CCl4. The
for the TA-DMSO and TPA-DMSO 1 : 1 complex in CCl4 were -15.3 kJ
and -14.2 kj
The Effects of Charge Transfer Complex on the Reaction of N,N-dimethylaniline and Iodine
Oh-Yun Kwon ; U-Hyon Paek ; Eung-Ryul Kim ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 191~196
Reaction of N,N-dimethylaniline(N,N-DMA) and iodine in
(1:1), and CH2Cl2 has been studied kinetically by using conductivity method. Pseudo first-order rate constants (
) and second-order rate constants (
/[N,N-DMA]) are dependent on the N,N-DMA concentration. Second-order rate constants obtained were decreased with increasing N,N-DMA concentration. We analysed these results on the basis of formation of charge transfer complex as a reaction intermediate. From the construction of reaction scheme and activation parameters for the formation and transformation of charge transfer complex. The equilibrium constants decreased when the dielectric constant of solvent was increased, and the value is 1.9
. The rate of transformation are markedly affected by the solvent polarity.
is 6.3-12.6kJ/mol, and
is large negative value of -234J/mol K.
Theoretical Studies on the Cationic Polymerization Mechanism of Cyclic Acetals
Young-Gu Cheun ; Jae-Kyung Kim ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 197~204
The cationic polymerization of cyclic acetals are investigated theoretically using the semiempirical MINDO/3, MNDO, and
, methods. The nucleophilicity and basicity of cyclic acetals can be explained by the negative charge on oxygen atom of cyclic acetals. The reactivity of propagation in the polymerization of cyclic acetals can be represented by the positive charge on
atom and the low LUMO energy of active species of cyclic acetals. The reactivity of 2-buthyl-1,3-dioxepane(2-Bu-DOP) of cyclic oxonium and opening carbenium ion form is expected computational stability of the oxonium ion by 5
7kcal/mole favoring the carbenium ion. Owing to the rapid equilibrium of these cation forms and the reaction coordinate based on calculation that the reaction coordinate based on calculation that the chain growth
mechanism will be at least as fast as that for
Studies on the Coordination of Acetamide to Rare Earth Metal Ion (Ln(II)
Sang-Won Lee ; Jeonga Yu ; Chang-Ju Yoon ; Yoo-Hyek Jun ; Young-Sang Choi ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 205~211
+ amide III combination band spectrum of acetamide (AA) was obtained in very dilute solutions of AA+lanthanide shift reagents (LSR) in carbon tetrachloride over the range of
. It was found that only 1 : 1 AA-LSR complex is formed by the interaction between carbonyl oxygen of AA and central metal ion(Ln(Ⅲ)) in LSR. The thermodynamic parameters for Ln(III)
O=C bond were determined by computer analysis of concentration and temperature dependent spectra.
for the coordination of AA to Eu
, and Pr
have been found to be -39.1, -28.4, and -25.5 kJ/mol, respectively. It has shown that this type of ion-dipole interaction is more than twice stronger compared to the dipole-dipole interaction in the amide linkage, and largely depending on the steric hindrence effect by the bulky dpm groups around central metal ion (Ln(III)) rather than the ionic potential effect of central metal ion itself.
Thermodynamic, Infrared, and Magnetic Studies on the Complexation of Gd(III) by Benzoate Anion
Young-Inn Kim ; Heung-Jae Park ; Sung-Nak Choi ; Sock-Seung Yun ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 212~217
The thermodynamic parameters for the formation of gadolinium benzoate have been determined in the ionic medium of 0.1 M
in aqueous solution. The thermodynamic results indicate that the complex is stabilized by the excess entropy effect caused by the dehydration of reacting ions. The especially high stability of Gd(III)-benzoate compared to the monodentate ligand complexes might be ascribed to the conjugation effect of the benzene ring in the benzoate ligand. IR spectra show that benzoate anion acts as a bidentate ligand toward
to form a chelate ring in solid state. Magnetic susceptibility data of the compound were also obtained and well described by Curie-Weiss law in the temperature range 80
Plant Tissue Sensor for Determination of Cytidine
Gwon Shik Ihn ; Chin Kap Chung ; Bong Weon Kim ; Young Guk Jeon ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 218~222
Rose tissue containing cytidine deaminase converts cytidine to uridine and ammonia gas. Rose tissue sensor was constructed by immobilizing 50mg of a rose petal tissue on an NH3 gas sensor and the optimum condition of the sensor for the determination of cytidine was investigated. The tissue sensor showed a linear range of
M cytidine with a slope of 53 mV/decade in 0.2 M phosphate buffer, pH 8.4 at 37
. The detection limits were
M and relative standard deviation was 3.4%. This sensor showed an excellent selectivity among various nucleosides and amino acids.
Studies on the Metal-Exchange Reaction of Tetrahedral Cu(II) Complex with Mercuric Ion and Mercury Metal
Young Tae Gong ; Sung Nak Choi ; Yoon-Bo Shim ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 223~229
Mechanistic studies on the metal-exchange reactions of sparteine copper(II) dichloride [
] with Hg(II) ion and Hg(0) metal have been carried out with the aid of Cyclic Voltammetry and UV-visible spectrophotometry. The metal exchange reaction of
with both Hg(II) ion and Hg(0) metal follows pseudo-first order kinetics. Rate constants and activation parameters of metal exchange reaction have been evaluated and reported. Experimental results indicate that the rate determining step for the exchange reaction is the cleavage of Cu(II)-N bond in the transient binuclear complex of Cu(II) and mercury(II) bound to sparteine ligand.
Correlation Between Bond Energy of Metal-Ligand and Observed Heat of Ligation of Cu(II) Complexes
Young-Dae Song ; Chen-Ho Choi ; Byung-Kak Park ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 230~237
The correlation was investigated between the observed heat of ligation and calculated bond energy for square planar and octahedral Cu(II) complexes by EHMO (Extended Huckel Molecular Orbital) method. It was found that net charge of
ion of both square planar
(X = 0, 1, 2,
4) and octahedral
complexes (X = 0, 1, 2,
6) is decreased with substituting
molecule. It was found that a good relationship exists between the observed heat of ligation and the calculated bond energy. From this fact, we can obtain a linear equation
+ 0.4718, theoretical equation.
Analysis of Chloride with the Moderate Power Helium Microwave Induced Plasma by Generating Volatile Gas Generation
Yong-Nam Park ; Heoungbin Lim ; Chang-Joon Park ; Kwang-Woo Lee ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 238~242
Traces of Chloride in aqueous solution was converted to volatile HCl or
by acids to be analyzed by the moderate power (500W) Helium Microwave Induced Plasma. Optimum conditions were obtained and the detection limit was found to be 4.3 ppm which is about ten times more sensitive compared to the direct analysis of aqueous samples. In addition to the batch type, a continuous type analysis was studied as well.
A Study on the Determination of Palladium in
Sun Tae Kim ; Kyoung Jin Min ; Young Hee Lee ; Je Ahn Park ; Beom Suk Choi ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 243~247
Inductively coupled plasma-atomic emission spectrometry was applied to determine the palladium in
employed for a gas sensor. Since
is hardly decomposed into the solution, extensive studies were devoted to the development of decomposition methods which minimize the interference effect. The matrix effects on the background level and emission intensity of the element were studied and they were compensated by using matrix matched solution.
Chloro- and Hydrido Complexes of (Pentamethylcyclopentadienyl) bis(phosphine)ruthenium
Dong-Hwan Lee ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 248~254
, 1/2DPPE, 1/2DPPB) (2a
2f) have been synthesized by the reaction of
(1) with excessive phosphine in ethanol. The reaction of complexes
in ethanol gave the corresponding hydride complexes
, 1/2 DPPE, 1/2DPPB) (3a
3e). Chloride complexes (2a
2f) and hydride complexes (3a
3e) were isolated as crystals, which were characterized by IR,
, and elemental analysis.
Spectrophotometric Determination of Traces of Phosphorus in Semiconductor-grade Trichlorosilane
Dong Kwon Kim ; Myoung Wan Han ; Hee Young Kim ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 255~260
A procedure for spectrophotometric determination of traces of phosphorus(P) in high-purity trichlorosilane(TCS) is proposed using an adsorptive separation.
, which is a dominant P impurity within TCS, is first oxidized by oxygen to a stable form as
is selected as an adsorbent which forms a thermally stable complex with
in TCS and can be well dissolved in aqueous ethanol solution. The proposed adsorptive separation method is free from the formation of silica gel and gas bubbles during the colorimetric analysis of TCS. The method reveals that the P concentration in a semiconductor-grade TCS is 5.32
within the standard deviation of
17%. On the other hand, the P concentration of the purified TCS which is separated from the
complex is reduced to be less than 0.15
, showing the efficient applicability of
to the wet chemical analysis. The proposed method is also tested to verify the effectiveness of other well-known adsorbents.
Electrochemical Propertics and Oxidation Reaction of Hydrazobenzene by Oxygen Adducted Tetradentate Schiff Base Cobalt(II)(3MeOSED) Activated Catalyst in Aprotic Solvents(I)
Ki-Hyung Chjo ; Yong-Kook Choi ; Sang-Bock Kim ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 261~272
Tetradentate Schiff base Cobalt(II)(3MeOSED)
complexe was synthesized and allowed to react with dry oxygen to form oxygen adducts of Cobalt(III) complexes such as
-peroxo type [Co(III)(3MeOSED)(DMF)]
in DMF and DMSO or superoxo type [Co(III)(3MeOSED)(Py)]
in pyridine. The oxygen adducted complex was investigated by cyclic voltammetry and DPP method with glassy carbon electrode in 0.1M TEAP-DMF (-DMSO,-Py) as supporting electrolyte solution. As a result the reduction reaction process occurred to four steps including prewave Of
in 1 : 1 oxygen adducted superoxo type [Co(III)(3MeOSED)(Py)]
complex and three steps not including prewave of
in 1 : 2 oxygen adducted
-peroxo type [Co(III)-(3MeOSED)(DMF)]
. A superoxo type [Co(III)(3MeOSED)(L)]
was generated with oxygen in methanol. Selectively oxidized hydrazobenzene
to trans-azobenzene(t-AB) and the rate constant k for oxidation reaction of the following equation is
+ Co (II)(3MeOSED)
Development of a New Analytical Instrument with Glow Discharge System and Studies on the Direct Solid Analysis Method
Jeoung Hwa Park ; Hyo Jin Kim ; Jin Chun Woo ; Chang Joon Park ; Dae Won Moon ; Kwang Woo Lee ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 273~281
A new sputtering chamber, as Atomsource, for atomic absorption measurements was designed and built to have maximum ground state atoms in view and minimum emission. The high velocity gas jets not only change the visual and electrical characteristics of the discharge, but also increase the amount of material atomized, as is apparent from the craters that are produced in the sample where the jets strike the surface. The use of gas jets in a sputtering cell makes this a direct sampling method practical for atomic absorption spectrometry. The factors influencing absorption sensitivity and reproducibility have been investigated for the newly developed atomizer.
Synthesis and Antimicrobial Activity of Polyacryloyl- and Polymethacryloylcephradine
Kim, Sun-Il ; Cha, Wol-Suk ; Na, Jae-Woon ; Kim, Young-Ho ; Ko, Ok-Hyun ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 282~286
The reaction of N-hydroxysuccinimide with polyacrylic acid and polymethacrylic acid gave poly(N-acryloxysuccinimide)and poly(N-methacryloxysuccinimide), whose reaction with cephradine provided polyacryloylcephradine and polymethacryloylcephradine. The activities of these polymeric drugs were investigated in terms of minimum inhibitory concentration by the common twofold dilution technique. Polyacryloylcephradine revealed excellent antibacterial activity against Staphylococcus aureus ATCC 25923, Staphylococcus aureus FDA 209P, Bacillus subtilis ATCC 6633, Bacillus licheniformis ATCC 14580, Escherishia coli BE 1186 and Salmonella typhimurium TV 119. Polymethacryloylcephradine revealed excellent Staphylococcus aureus ATCC 25923, Staphylococcus aureus FDA 209P, Bacillus subtilis ATCC 6633, Escherichia coli Be 1186 and Salmonella typhimurium TV 119.
Solvent Effects on the Nucleophilc Addition (I) Effect of Solvent Polarity on the Nucleophilic Addition of Amine to Phenylvinylketone
Gap-Cheol Shin ; Tae-Rin Kim ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 287~292
The rate constants of the nucleophilic addition reaction of amines (piperidine and diethylamine) to phenylvinylketone in various solvents have been determined by UV spectrophotometry at
. On the basis of the high sensitivity of the rate to the polarity of the medium, it may be concluded that the reaction intermediate has zwitterionic character. The effect of the solvents on the rate of the bimolecular nucleophilic addition reaction is described well by the Kirkwood equation: The transition state of the reaction has a cyclic structure formed through an intramolecular hydrogen bond. The addition reaction of primary and secondary amines to phenylvinylketone in all solvents take place considerably faster than that of tertiary amine and this results also can be explained by the intermediate products in the reaction have a cyclic structure formed through an intramolecular hydrogen bond for the primary and secondary amines but not for the tertiary amine.
Studies on the Synthesis and Antibacterial Activity of New
Tae Heung Song ; Young Ho Kim ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 293~300
The synthesis of a series of 7-[(Z)-2-(2-aminothiazol-4-yl)-2-oxyiminoacetamido]-3-(4,6-diamino-1-alkyl-1,3,5-triazinium-2-yl)thiomethyl-3-cephem-4-carboxylates is described. Variations of an oxyimino moiety in the 7-side chain and quaternary ammonium moiety in the 3-side chain were examined and structure-activity relationship was studied. The 4,6-diamino-1-methyl-1,3,5-triazinium-2-yl derivative of the 7-
-methoxyimino series of cephalospoins, particularly 7-[(Z)-2-(2-aminothiazol-4-yl)-2-(methoxyimino)acetamido]-3-(4,6-diamino-1-methyl-1,3,5-triazinium-2-yl)thiomethyl-3-cephem-4-carboxylate(C-1), exhibited broad antibacterial activity against Gram-positive and Gram-negative bacteria including Pseudomonas aeruginosa.
The Facile Synthesis of Pyrrolidinobenzenes from Adipaldehyde and Phenylenediamine using
Sang Chul Shim ; Byung Won Woo ; Chil Hoon Doh ; Dong Yup Lee ; Young Zoo Youn ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 301~304
, combined with adipaldehyde is very efficient for the selective transformation of an amino group into a perhydroazepine ring. Phenylenediamines react with adipaldehyde in the presence of
at room temperature under the atmospheric pressure of carbon monoxide to give the corresponding perhydroazepines in moderate yields. In these reactions, the molar ratio of 1.0 : 1.0 : 1.0 of the ferrate-adipaldehyde-phenylenediamine system gave one perhydroazepine ring, and the case of 1.0 : 2.0 : 1.0 gave two perhydroazepine rings, selectively.
Reaction of Cobalt Doubledecker Sandwich Complexes with Oximes for Synthesizing Cobalt Oxime Sandwich Complex
Won-Sik Lee ; Hyuk Lee ; Sang-In Byun ; Young-Bae Park ; Kwang Lee ; Jae-Kook Uhm ; Young-Woo Kwak ; Tae-Jeong Kim ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 305~310
-Cyclopentadienyl)bis(ethylene)cobalt (Jonas reagent), (
-cyclopentadienyl)di(carbonyl)cobalt, and bis(
-cyclopentadienyl)cobalt (cobaltocene) were reacted with oximes, respectively, under various conditions for synthesizing cobalt oxime sandwich complex. Jonas reagent and a dienemonooxime, 2,4-hexadienealdoxime underwent the reaction. This produced unexpected compound, (
-cyclopentadienyl)(2,4-hexadienenitrile)cobalt [VII]. The compound [VII] was identified by NMR, mass spectrometer, IR and elemental analyzer etc.
Reactions of 3-Alkylidene-2,4-pentanediones with Arylhydrazines
Se Young Lee ; Seung Hoi Kim ; Youn Young Lee ; Yang Mo Goo ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 311~317
Reaction of 3-alkylidene-2,4-pentanediones(1) with arylhydrazines in methanol afforded 4-acetyl-(2), 4-(1-methoxyalkyl)-(3), or 4-vinylpyrazole derivatives(4). 3-(2,2,2-Trichloroethylidene)-2,4-pentanedione(9) reacted with arylhydrazines to give 4-acetyl-1-aryl-3-methylpyrazoles(11). Possible mechanisms for these reactions were proposed.
Synthetic Studies on the Nucleophilic Addition of 1-Methyl-5-mercapto-1,2,3,4-tetrazole to Vinylsulfilimines
Tae-Rin Kim ; So-Young Lee ; Sang-Yong Pyun ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 318~323
Following seven new nucleophilic adducts of sulfilimine compounds were prepared by the addition of 1-methyl-5-mercapto-1,2,3,4-tetrazole to vinylsulfilimine derivatives; S-Phenyl-S-2-(1-methyl-1,2,3,4-tetrazole-5-thio)-ethyl-N-p-tosylsulfilimine, S-p-tolyl-S-2-(1-methyl-1,2,3,4-tetrazole-5-thio)-ethyl-N-p-tosylsulfilimine, S-m-tolyl-S-2-(1-methyl-1,2,3,4-tetrazole-5-thio)-ethyl-N-p-tosylsulfilimine, S-p-chlorophenyl-S-2-(1-methyl-1,2,3,4-tetrazole-5-thio)-ethyl-N-p-tosylsulfilimine, S-p-bromophenyl-S-2-(1-methyl-1,2,3,4-tetrazole-5-thio)-ethyl-N-p-tosylsulfilimine, S-p-methoxyphenyl-S-2-(1-methyl-1,2,3,4-tetrazole-5-thio)-ethyl-N-p-tosylsulfilimine and S-p-nitrophenyl-S-2-(1-methyl-1,2,3,4-tetrazole-5-thio)-ethyl-N-p-tosylsulfilimine. The structures of these adducts were confirmed by elemental analyses, MP, UV, IR-and NMR-Spectra.
Conformational Analysis of Cyclodextrins and Their Methylated Analogs
Hee-Sook Choi ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 324~328
NMR chemical shifts and coupling constants for
-cyclodextrins in neutral aqueous media were assigned based on the 470MHz spectra. In order to obtain accurate chemical shifts and coupling constants the experimental spectra were analyzed with the Raccoon spin simulation program. The rotamer distribution around the
bond of the cyclodextrins evaluated from the coupling constants of
. In our calculation of the
-cycliodextrin showed that gg conformers were most favorable form and tg conformers were least favorable form. It is very interesting to note the changes in
coupling constants of permethylated
-cyclodextrins from unmodified one. The gg conformers were more increased than unmodified one and instead of tg conformers gt conformers were least favorable one upon methylation.
Ultrasonic Measurement in Bovine Serum Albumin Solution
Jong-Rim Bae ; Seung Hyun Chang ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 329~334
Ultrasonic absorption was measured in bovine serum albumin (BSA) aqueous solution (50 g/l) in the frequency range from 100 kHz to 1600 MHz at neutral pH. Three experimental techniques were used to cover the wide frequency range : plano-concave resonator, conventional Bragg reflection, and high-resolution Bragg reflection methods. The absorption spectrum at neutral pH fitted the relaxation curve well using the distribution function of a mirror image of Davidson-Cole function. The relaxaition behavior was interpreted in terms of various degree of hydration of BSA molecules.
Modified Purines as Mechanistic Probes of Substrates Oxidation by Xanthine Oxidase
Chang-Hee Lee ; In-Sup Han ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 335~337
Separation and Determination of Scandium by Di-(2-Ethylhexyl)-phosphate as an Extractant in EtOH Media
Ki-Won Cha ; Eui-Sik Jeong ;
Journal of the Korean Chemical Society, volume 36, issue 2, 1992, Pages 338~341