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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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Korean Chemical Society
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Volume & Issues
Volume 41, Issue 12 - Dec 1997
Volume 41, Issue 11 - Nov 1997
Volume 41, Issue 10 - Oct 1997
Volume 41, Issue 9 - Sep 1997
Volume 41, Issue 8 - Aug 1997
Volume 41, Issue 7 - Jul 1997
Volume 41, Issue 6 - Jun 1997
Volume 41, Issue 5 - May 1997
Volume 41, Issue 4 - Apr 1997
Volume 41, Issue 3 - Mar 1997
Volume 41, Issue 1 - Feb 1997
Volume 41, Issue 2 - Feb 1997
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Study on the Surface Reactions of Graphite Electrodes by Anodic Polarization
오한준 ; 김인기 ; 이종호 ; 이영훈 ;
Journal of the Korean Chemical Society, volume 41, issue 1, 1997, Pages 1~11
Electrode surface reaction on three carbon materials(glassy carbon, synthesized graphite, graphite foil) in 0.5 M K2SO4 electrolyte is investigated by impedance spectroscopy during anodic polarization. The double layer capacitance of the graphite foil electrode is relatively higher than that of other two materials. The change of capacitance parameter C due to chemical adsorption on glassy carbon and synthesized graphite(PVDF graphite) is observed in 0.5 M K2SO4 solution at anodic polarization. In general, the faradic impedance on glassy carbon depends on anodic polarization, and the change of impedance parameter on graphite foil at anodic polarization is not remarkable, because this reaction is controlled by field transport.
Acid and Nucleophile-Catalyzed Hydrolysis of Sulfinamides
이종팔 ; 엄태섭 ;
Journal of the Korean Chemical Society, volume 41, issue 1, 1997, Pages 11~39
We have been kinetically studied on acid and nucleophile catalysis for hydrolysis of sulfinamides at 25℃ in aqueous solution at the ionic strength of 0.1 M with NaClO4 by spectrophotometrically. The substrates which the leaving group aniline has electron donating group were shown a breakdown of pH-rate profile at near pH 3 as well as the substrate having electron donating group at benzenesulfinyl group. The break is ascribed to a change in the rate determining step of the reaction involving a hypervalent intermediate. However, the substrates which have the leaving group with electron withdrawing group were not observed a breakdown of pH-rate profile at pH 3. Catalysis of halide ion was observed in the hydrolysis of sulfinamides. The nucleophile reactivity observed was in the order of Br- > Cl-, but also found to depend upon the acid concentration of solution. From the Hammett's reaction constant ρ values which were obtained by effect of substituent of sulfinamides, we expect that the reaction mechanism may proceed via sulfonium cation.
Effect of n-Butanol on the Mixed Micellar Properties of Sodium Dodecylsulfate(SDS) with Sodium Dodecylbenzenesulfonate(DBS)
Journal of the Korean Chemical Society, volume 41, issue 1, 1997, Pages 12~17
The critical micelle concentrations(CMC*) and the counterion binding constants(B) in a micellar state of the mixed surfactant systems of sodium dodecylsulfate(SDS) with sodium dodecylbenzenesulfonate(DBS) at 25℃ in pure water and in aqueous solutions of n-butanol were determined as a function of α1 (the overall mole fraction of SDS) by the use of electric conductivity method. Various thermodynamic parameters(Xi, γi, Ci, aiM, β, ΔHmix and ΔGm0 for the micellization of SDS/DBS mixtures were calculated and analyzed by means of the equations derived from the nonideal mixed micelle model. The effect of n-butanol on the mixed micellization of SDS/DBS mixtures have been measured and analyzed by comparing the values of the thermodynamic parameters in pure water with those in aqueous solutions of n-butanol(0.1 M, 0.2 M, and 0.3 M).
A Prediction of the Abnormal Behavior in the Viscosity of Liquid Water Near 4℃
김원수 ; 최동식 ;
Journal of the Korean Chemical Society, volume 41, issue 1, 1997, Pages 12~52
Separation of Pd(II) Ion Using the Polymerized
Mixed Donor Macrocycle
김정 ; 김정훈 ; 김시중 ;
Journal of the Korean Chemical Society, volume 41, issue 1, 1997, Pages 15~33
N2O2-donor macrocycle based polymer, poly(1,12-diaza-3,4: 9,10-dibenzo-5,8-dioxacyclopentadec-1,12-ylene-2,7-dilydroxyoctamethylene: poly-NTOE) was synthesized to separate of Pd2+ ion by column chromatography. Binding constants between the poly-NTOE and metal ions were measured in order to identify the selectivity of the poly-NTOE for metal ions such as Na+, Ca2+, Cu2+ and Pd2+ ion. The poly-NTOE stationary phase exibited stronger affinity for Pd2+ ion in comparison with other metal ions. This affinity was continued to 2.0 M HCl. Chromatograms for the mixtures of metal ions were obtained using 1.0 M HCl aqueous solution as eluent. Pd2+ ion was separated selectively. Separation efficiency was investigated in view of the column length and amount of stationary phase. Better efficiency was obtained by increasing column length.
The Hydrophobicity of Hydroxybenzoate ester in Reversed Phase High Performance Liquid Chromatography
유은아 ; 정소영 ;
Journal of the Korean Chemical Society, volume 41, issue 1, 1997, Pages 18~25
Hydrophobic effect as an important role of retention mechanism has been examined through composition change in mobile phase(60∼80%) using two kinds of modifier(MeOH, ACN) over the temperature ranging from 5℃ to 55℃ in RP-HPLC. By observing retention behavior, it can be seen that the hydrophobicity index φ0 is more characteristic and reasonable when compared with the another hydrophobicity index, logkw' or S index.
The Spectroscopic Studies on the Interaction between Organic Dye and Cyclodextrins in Aqueous Solution
최호섭 ; 정갑상 ; 김흥두 ;
Journal of the Korean Chemical Society, volume 41, issue 1, 1997, Pages 22~57
Kinetic Studies on Nucleophilic Substitution Reaction of Phenacyl Halides with Pyridines in MeOH-MeCN Mixtures
구인선 ; 양기열 ; 박종근 ; 이익춘 ;
Journal of the Korean Chemical Society, volume 41, issue 1, 1997, Pages 22~46
Kinetic studies on nucleophilic substitution reaction of phenacyl bromide and phenacyl chloride with pyridines were conducted at 25℃ and 35℃ in methanol-acetonitrile solvents mixtures. It was shown that the reaction proceeds via an SN2 reaction mechanism based on the transition state parameters, ΔH≠ and ΔS≠ and Bro nsted β values. Quantum mechanical model predicted a product-like transition state, where bond-formation is much more progressed than bond breaking, upon changing the leaving group to that with a better leaving ability.
Determination of Traces of meso-2,3-Dimercaptosuccinic Acid by Differential Pulse Cathodic Stripping Voltammetry
구희진 ; 권영순 ;
Journal of the Korean Chemical Society, volume 41, issue 1, 1997, Pages 26~32
Cyclic voltammogram of meso-2,3-dimercaptosuccinic acid(DMSA) has two redox peaks. The potential difference between the two peaks is very small(Ep1=-0.64 V; Ep2=-0.68 V). In the absence of Cu(Ⅱ), the cathodic peak is more effective for trace analysis of DMSA, while the mono thiol compound is more effective in the presence of Cu(Ⅱ). The present study also describes the differential pulse cathodic stripping voltammetric method for the determination of DMSA. The followings were optimum condition for the study: 0.015 M borate buffer solution(pH 10.0); an accumulation potential of -0.2V(vs. Ag/AgCl); accumulation time of 120 sec; scan rate of 5 mV/sec. The detection limit of trace analysis shows 3.6 × 10-9 M of DMSA at the optimum condition.