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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Chemical Society
Journal Basic Information
Journal DOI :
Korean Chemical Society
Editor in Chief :
Byeong Moon Kim
Volume & Issues
Volume 50, Issue 6 - Dec 2006
Volume 50, Issue 5 - Oct 2006
Volume 50, Issue 4 - Aug 2006
Volume 50, Issue 3 - Jun 2006
Volume 50, Issue 2 - Apr 2006
Volume 50, Issue 1 - Feb 2006
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Ab Initio Study of Vibrational Spectra of p-tert-Butylcalixaryl Ester Complexed with Alkali Metal Cation
Choe, Jong-In ; Kim, Gwang-Ho ;
Journal of the Korean Chemical Society, volume 50, issue 1, 2006, Pages 7~13
DOI : 10.5012/jkcs.2006.50.1.007
infrared(IR) absorption spectra were calculated for the ethyl ester of p-tert-butylcalixarene (1) in the cone conformer and its alkali-metal-ion complex. The vibrational spectra were obtained by restricted Hartree-Fock (RHF) calculations with the 6-31G basis set. The characteristic vibrational frequencies of various C-O and C=O stretching motions of the complexes show that the structure of 1+K+ complex is almost of C4v symmetry compared to 1+Na+ (C2v) analogue. The theoretical results for the host molecule 1 and complex (1+Na+) were compared with the experimental results, and the calculated vibrational frequencies agree well with the features of the experimental spectra.
Study on High Degree of Efficiency Chemical Reactor for Air Purification Using the Glow Discharge
Kim, Gi-Ho ; Bu, Min-Ho ; Lee, Sang-Cheon ;
Journal of the Korean Chemical Society, volume 50, issue 1, 2006, Pages 14~22
DOI : 10.5012/jkcs.2006.50.1.014
the basic model of chemical reactor using glow discharge, we used cathode discharge cell with vacant cavity in the middle. Currently glow discharge is widely studied as a radiation source or atomization device in atomic spectroscopy and remarkable technological achievements are made through the graft with other analysis devices such as microanalysis and steel analysis.1 Additionally, as the characteristics of basic glow discharge and radiation have been reviewed many times, those results could be used in this experiment.2-3 In 1993, an article regarding the treatment of poisonous gas in the air using low temperature plasma was published. According to this article, if DC Glow Discharge is used under continuous atmospheric flow, poisonous gases such as SO2 and NO can be removed.4 Based on those findings, we designed highly efficient reactor where stable air plasma is composed and all air flow pass the negative glow area passing through the tube. It was observed that the cathode tube type glow discharge developed in this study would be economical, easy to use and could be used as radiation source as well.
Preconcentration and Extraction of Copper on Activated Carbon Using 4-Amino-2, 3-dimethyl-1-phenyl-3-pyrazoline or 4-(4-methoxybenzylidenimin) thiophenole
Ghaedi, Mehrorang ; Ahmadi, Farshid ; Karimi, Hajir ; Gharaghani, Shiva ;
Journal of the Korean Chemical Society, volume 50, issue 1, 2006, Pages 23~31
DOI : 10.5012/jkcs.2006.50.1.023
carbon modified methods were used for the preconcentration and determination of copper in some real samples using the flame atomic absorption spectrometry. The copper ions was adsorbed quantitatively on the activated carbon due to their complexation with 4- amino-2, 3-dimethyl-1-phenyl-3-pyrazoline (ADMPP) or 4-(4- methoxybenzylidenimin) thiophenole (MBITP). The adsorbed copper on solid phase was eluted quantitatively using small amount of nitric acid. The influence of important parameters including pH, amount of carrier, flow rate, amount of activated carbon and type and concentration of eluting agent for obtaining maximum recovery were investigated. The methods based on ADMPP and MBITP at optimum conditions is linear over concentration range of 0.05-1.5 g mL-1 and 0.05-1.2 g mL-1 of copper with correlation coefficient of 0.9997 and 0.9994 and both detection limit of 1.4 ng mL-1, respectively. The preconcentration leads to enrichment factor of 310 and break through volume of 1550 mL for both ligands. The method has a good tolerance limit of interfering ion and a selectivity that has been successfully applied for the determination of copper content in real sample such as tap, spring, river and waste water.
Spectroelectrochemical Study for Thin Film of Gold Nanoparticles
Seo, Seong S. ; Chambers, James Q. ;
Journal of the Korean Chemical Society, volume 50, issue 1, 2006, Pages 32~36
DOI : 10.5012/jkcs.2006.50.1.032
films of gold nanoparticles were formed on indium tin oxide (ITO) by an electrodeposition method from an aminosilicate stabilized gold colloid solution. The thin films were examined by cyclic voltammetry (CV), scanning electron microscopy (SEM), UV-visible, and energy dispersive X-ray spectroscopy (EDXS). The surface coverage of gold nanoparticles on the thin film was estimated to 1.2 nanomole/cm2. An anthraquinone-2, 6-disulfonic acid, disodium salt (AQDS) self-assembled layer was generated by immersing gold thin film into 1mM of AQDS in 0.1M HClO4 solution for over 20 hours. As a result, a new absorbance peak from the multi-layers (AQDS/thin film of gold /ITO) was obtained about at 690 nm. Also, the surface plasmon absorption of multi-layers was measured by UV-Visible spectrometer along with chronoamperometry by applying the various potentials from +0.5V to -0.5V. The maximum surface plasmon absorption band at 550 nm was decreased by applying negative potentials. The change of absorbance was correlated with the surface coverage of the AQDS indicating the pseudo-capacity surface state of the AQDS layer was coupled to the energy level of the plasmonband by applied negative potentials.
Analysis of Androgen Receptor Gene by Capillary Gel Eelectrophoresis
Kim, Yong-Seong ; Baek, Seung-Gwon ; Gang, Chung-Mu ; Gang, Dae-Cheon ; Lee, Su-Man ; Choe, Byeong-Ok ; Jeong, Gi-Hwa ; Choe, Gyu-Seong ;
Journal of the Korean Chemical Society, volume 50, issue 1, 2006, Pages 37~45
DOI : 10.5012/jkcs.2006.50.1.037
gel electrophoresis (CGE) with poly(ethylene oxide) has been applied to the measurement of CAG repeat number in Androgen receptor (AR) gene related to male infertility. Non-linear regression analysis was performed using the standard X174 RF/Hae III, 100bp step ladder DNA in order to investigate the exact number of CAG repeat. For 79 Korean infertile males and 89 controls, CAG repeats at exon 1 in AR gene was compared and analyzed by CGE. It turned out that CAG repeat numbers were 24.972.6 range, 17-29) for the infertile male, and 23.992.4 range, 18-29) for the control, respectively. P value (0.018) was less then 0.05, meaning that the result was statistically meaningful.
Kinetic Investigation of Olefin Oxidation by Al(III)-Porphyrin Complexes
Na, Hun-Gil ; Han, Man-So ;
Journal of the Korean Chemical Society, volume 50, issue 1, 2006, Pages 46~52
DOI : 10.5012/jkcs.2006.50.1.046
studies of olefin oxidation using Al(III)-porphyrin complexes as catalyst are investigated in CH2Cl2, in which NaClO is used as terminal oxidant. Porphyrins are TPP(5,10,15,20-Tetraphenylporphyrin) and (p-X)TPP(X=CH3O, CH3, F, Cl). Olefins are styrene and (p-X)styrene (X=CH3O, CH3, Cl, Br). The values of Km and Vmax are calculated from the Michaelis-Menten equation. According to the substituents of substrate and catalyst, kinetic parameters will be measured. Investigating the correlation between the Michaelis-Menten rate parameters and the substituent constants, we were able to analyze the influence on the changes of catalytic activity or the rate determining step during the process of the formation and the dissociation of the M-oxo-olefin.
Syntheses of FAPO-5 Molecular Sieves with Microwave Irradiation and Their Characterization
Jang, Jong-San ; Lee, Jin-Ho ; Jeong, Seong-Hwa ; Hwang, Jin-Su ;
Journal of the Korean Chemical Society, volume 50, issue 1, 2006, Pages 53~59
DOI : 10.5012/jkcs.2006.50.1.053
.FAPO-5 molecular sieves were synthesized starting from the same reactant gel at 170 oC using microwave irradiation technique and conventional hydrothermal reaction. The FAPO-5 molecular sieves were characterized by several techniques such as SEM, FTIR, UV/Vis, and ESR. Moreover, the oxidation of styrene over FAPO-5s was carried out, and compared to check the oxidation and epoxidation ability of the two FAPO-5s. FAPO-5 can be obtained easily by microwave irradiation within 15 min at 170oC, whereas FAPO-5 synthesis is completed in 6 h by conventional electric heating, confirming the acceleration about 20 times by microwave technique. There are no appreciable differences between two FAPO-5s in surface area and coordination state of iron. The FAPO-5 synthesized by microwave irradiation shows higher epoxide selectivity in the styrene epoxidation, which may be explained by the higher hydrophobicity of the catalyst.
Synthesis of Cubic Cu2O from Organic-Inorganic Hybrid
Heo, Yeong-Deok ; Song, Ha-Cheol ; Guk, Won-Geun ;
Journal of the Korean Chemical Society, volume 50, issue 1, 2006, Pages 60~64
DOI : 10.5012/jkcs.2006.50.1.060
has been synthesized using the layered organic-inorganic hybrids, Cu2(OH)3(CH3COO)·H2O as a precursor. Cubic Cu2O is synthesized by reducing Cu2(OH)3(CH3COO)·H2O with glucose in water at 75oC. The effects of precursor and glucose are investigated. The structure of Cu2(OH)3(CH3COO)·H2O plays an important role in preparing the uniform size of Cu2O.
A Research of Secondary School Chemistry Major Teachers’ Perceptions on the Drying Phenomenon of Frozen Wash
Baek, Seong-Hye ; Kim, Hyeon-Hui ; Yang, Gi-Chang ; Kim, Dong-Uk ;
Journal of the Korean Chemical Society, volume 50, issue 1, 2006, Pages 65~78
DOI : 10.5012/jkcs.2006.50.1.065
study identified secondary school chemistry major teachers' perceptions of sublimation related to the drying phenomenon of frozen wash and representation of the phenomenon on phase diagram. The subjects were 53 teachers for the questionnaire developed for this study, and interviews. The two professors who majored physical chemistry and one professor who majored analytical chemistry at teacher's college were interviewed for teacher educators' perceptions of sublimation. The results showed that forty one teachers among fifty three teachers thought that the drying phenomenon was sublimation. The most teachers who thought that the phenomenon was sublimation responded as a reason that solid state changes to gas state. The teachers who thought that the phenomenon was not sublimation responded as a reason that the 1 atm of air pressure was not the condition of sublimation. Seventeen teachers thought that the drying phenomenon of frozen wash could be represented on phase diagram, but thirty four teachers thought that it could not. But most teachers confused the scientific representation of the phenomenon, and felt difficulties to teach the contents to students.
The Patterns and the Characteristics of Students’ Interactive Argumentation in the Small-group Discussions
Journal of the Korean Chemical Society, volume 50, issue 1, 2006, Pages 79~88
DOI : 10.5012/jkcs.2006.50.1.079
study was to explore the patterns and the characteristics of students' interactive argumentation in the middle school science classes. The data were collected by observing and audiotaping the small-group discussions and the transcribed data were analyzed through the lens of Toulmin's argument frame. As the results, the three argumentation patterns, which could be combined different ideas with or without their warrants, were presented. In the first pattern, the argumentation including the claim and its warrant without any different ideas, the students argumentation did not have any conflict with each other in the discussions. In the second, the argumentation of different ideas without their warrants, the different ideas did not affect the claim. In the last, the argumentation of different ideas with their warrants, the students elaborated the claim through collaborative argumentation in search for the warrant. To understand and improve student discussions in the science classrooms, conclusion and implications were discussed based on the results.
DFT Studies on the Copper(I) Complexes of DNA Bases
Lee, Gap-Yong ;
Journal of the Korean Chemical Society, volume 50, issue 1, 2006, Pages 89~93
DOI : 10.5012/jkcs.2006.50.1.089