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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 51, Issue 6 - Dec 2007
Volume 51, Issue 5 - Oct 2007
Volume 51, Issue 4 - Aug 2007
Volume 51, Issue 3 - Jun 2007
Volume 51, Issue 2 - Apr 2007
Volume 51, Issue 1 - Feb 2007
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Hydrodynamic and Chloride Ion Effects on Corrosion of Cobalt in Bicarbonate Buffer Solution
Kim, Youn-Kyoo ; Chon, Jung-Kyoon ;
Journal of the Korean Chemical Society, volume 51, issue 6, 2007, Pages 479~486
DOI : 10.5012/jkcs.2007.51.6.479
Research Using Energy Landscape
Kim, Hack-Jin ;
Journal of the Korean Chemical Society, volume 51, issue 6, 2007, Pages 487~498
DOI : 10.5012/jkcs.2007.51.6.487
Energy landscape is a theoretical tool used for the study of systems where cooperative processes occur such as liquid, glass, clusters, and protein. Theoretical and experimental researches related to energy landscape are introduced in this review.
Nickel Complexes Having (N-C-N) Tridentate Ligands
Lee, Dong-Hwan ; Park, Soon-Heum ;
Journal of the Korean Chemical Society, volume 51, issue 6, 2007, Pages 499~505
DOI : 10.5012/jkcs.2007.51.6.499
Monomeric complexes of nickel(II) having terdentate bis(imino)aryl ligands (N,C,N-pincer) are reported. New complexes (2,6-(ArN=CH)2C6H3)NiBr (Ar=2,6-dimethylphenyl (1), 2,6-diisopropylphenyl (2)) have been synthesized through oxidative addition of 1,3-(ArN=CH)2C6H3Br (bis(N-Ar)-2-bromoisophthalaldimine: Ar=Ph-2,6-Me2, Ph-2,6-iPr2) to Ni(COD)2 (COD=1,5-cyclooctadiene), in high yields. The development of a synthetic route to ligands and nickel complexes is outlined. The complexes were characterized by IR, 1H-NMR and elemental analysis. Full characterization of complexes 1 and 2 is discussed. An investigation into the catalytic activity of the complexes in ethylene polymerization was performed, resulting in no formation of polyethylenes but producing a small amount of oily oligomers. Preliminary results indicate that the pincer complexes were found to be inactive as catalysts in ethylene polymerization.
Synthesis, characterization and spectral studies of various newer long chain aliphatic acid (2-hydroxy benzylidene and 1H-indol-3-ylmethylene) hydrazides as mosquito para-pheromones
Awasthi, Suman ; Rishishwar, Poonam ; Rao, Ambati N. ; Ganesan, Kumaran ; Malhotra, Ramesh Chandra ;
Journal of the Korean Chemical Society, volume 51, issue 6, 2007, Pages 506~512
DOI : 10.5012/jkcs.2007.51.6.506
Various long chain aliphatic acid hydrazides react with aromatic and heterocyclic aldehydes in alcoholic medium in refluxing conditions to give corresponding 2-hydroxy benzylidene and 1H-indol-3-ylmethylene hydrazides, a newer class of mosquito para-pheromones. We describe here synthesis of various novel long chain aliphatic acid (2- hydroxy benzylidene and 1H-indol-3-ylmethylene) hydrazides by conventional as well as microwave irradiation techniques. The structures of these compounds have been confirmed by spectroscopic techniques (FTIR, NMR & MS). Some of the interesting features of the electron impact mass spectral fragmentation pattern of these compounds have also been discussed.
Water-Soluble Distyrylbenzene Fluorophore and Fluorescence Behavior in a Polymeric Vesicle
Nayak, Rati Ranjan ; Woo, Han-Young ;
Journal of the Korean Chemical Society, volume 51, issue 6, 2007, Pages 513~519
DOI : 10.5012/jkcs.2007.51.6.513
A vesicle forming polymer, poly(sodium acrylamidoundecanoate) (PSAU) and a water-soluble distyrylbenzene- based fluorophore, TPADSB-C were synthesized and characterized by using UV-vis and photoluminescence (PL) spectroscopy. An inter-chain vesicle formation of PSAU was observed at ~0.01 g/L from N-phenyl naphthylamine fluorescence measurement with changing PSAU concentration in water. Above critical aggregation concentration of PSAU, optical properties of TPADSB-C were investigated to study the microenvironment modulation through dye incorporation in the polymeric vesicle. The emission of TPADSB-C in the presence of PSAU vesicles was blue-shifted and the PL quantum efficiency was increased to 90% due to the microenvironment (e.g. polarity) change in aqueous solution. This study shows that the polymeric vesicle containing molecular fluorophores has a great potential as an efficient, stable and biocompatible labeling tag in biological cell imaging.
Easy-to-execute 'One-pot' Synthesis of 1,2,4,5-Tetrazines Catalyzed by Activated Fly Ash
Gopalakrishnan, M. ; Thanusu, J. ; Kanagarajan, V. ;
Journal of the Korean Chemical Society, volume 51, issue 6, 2007, Pages 520~525
DOI : 10.5012/jkcs.2007.51.6.520
Three-component coupling of thiourea/urea, various structurally diverse aromatic aldehydes and ammonium acetate is catalyzed by activated fly ash in dry media under microwave irradiation to give 6-aryl-1,2,4,5-tetrazinan- 3-thiones/ones in good yields. The structure of 6-aryl-1,2,4,5-tetrazinan-3-thiones/ones have been elucidated on the basis of their melting points, elemental analysis, MS, IR, 1H NMR, D2O exchange, 13C NMR and two dimensional NMR spectral studies including Homonuclear Correlation (HOMOCOR) and Heteronuclear Single Quantum Correlation (HSQC) spectra.
Synthesis and Supramolecular Assembly of Ru(II)-Terpyridine Complexes linked with β-Cyclodextrin or Adamantyl Group
Park, Dae-Rim ; Chung, Yong-Chae ; Choi, Kyung-Ho ; Kim, Hyung-Jin ;
Journal of the Korean Chemical Society, volume 51, issue 6, 2007, Pages 526~535
DOI : 10.5012/jkcs.2007.51.6.526
Ru(II)-terpyridine complexes (8, 9, 11) linked with adamantyl or β-cyclodextrin moieties were synthesized and characterized based on their 1H and 13C NMR spectra as well as MS spectra. Ru(II)-terpyridine complexes (8, 11) linked with adamantyl moiety were readily dissolved in aqueous solution via encapsulation by β-cyclodextrin when they were mixed with an equimolar amount of β-cyclodextrin. In the similar way, the adamantane guest of the Ru(II)-terpyridine complexes (8, 11) were encapsulated by β-cyclodextrin moiety of the ruthenium complex 9 to afford supramolecular assemblies in aqueous environment. Formation of assemblies was corroborated by 1H NMR spectroscopy.
Molecular Genetic Analysis of Behcet's Disease in Korean
Park, Sang-Bum ; Nam, Youn-Hyoung ; Park, Su-Min ; Lee, Sang-Hyun ; Ahn, Young-Chang ; Cho, Min-Ho ; Kim, Jong-Gyu ; Choi, Jae-Gu ; Kim, Seong-Kyu ; Jang, Won-Cheoul ;
Journal of the Korean Chemical Society, volume 51, issue 6, 2007, Pages 536~542
DOI : 10.5012/jkcs.2007.51.6.536
Behcet's disease (BD) is a chronic inflammatory disorder, involving several organs. Inflammation in the disease is thought to be mediated by cytokines derived from T-helper type 1 (Th1) lymphocytes. Although the exact pathogenesis for BD is not completely understood, it has been suggested that the disease is triggered in genetically susceptible individuals by environmental factors, such as microbial agents. It is noted that multiple genes, including MHC (major histocompatibility complex) and non-MHC genes, are implicated in the pathogenesis of BD. This study tries to determine whether HLA-B51, IL-18, SLC11A1 and TNF-α polymorphisms are associated with susceptibility to Behcet's disease in Koreans. As a results, HLA-B51 was a genetic factor with the strongest association with BD. But it is still uncertain whether this HLA molecule is directly involved in the pathogenesis of BD. Although the IL-18 gene polymorphisms were not associated with a susceptibility to BD in the Korean population, the patients carrying the GG genotype at position 137 had a higher risk of developing the ocular lesions. This study suggests that the allele 3 and the genotype allele 3 / allele 3 of 5'-promoter (GT)n polymorphism in the SLC11A1 gene may have a protective effect for the development of BD in the Korean population. There were no evidences for genetic association conferred by the TNF-α gene with respect to susceptibility to BD.
Analysis of the GCK and HNF-1α Gene Polymorphism in Korean Type 2 Diabetic Patients by PCR-DHPLC
Nam, Youn-Hyoung ; Park, Dae-Yong ; Park, Sang-Bum ; An, Young-Chang ; Lee, Sang-Hyun ; Cho, Min-Ho ; Park, Su-Min ; Jang, Won-Cheoul ;
Journal of the Korean Chemical Society, volume 51, issue 6, 2007, Pages 543~548
DOI : 10.5012/jkcs.2007.51.6.543
Maturity-onset diabetes of the young (MODY) is a genetically heterogeneous subtype of Type 2 diabetes characterized (non-insulin-dependent) by early onset, usually before 25 years of age, autosomal dominant inheritance and a primary defect in insulin secretion. Mutations in the glucokinase (GCK) and hepatocyte nuclear factor (HNF)-1α genes are the major causes of monogenic forms of Type 2 diabetes mellitus. Therefore it is need to study relation with these polymorphisms by diverse analysis methods. The promotor and coding regions inclusive intron exon boundaries of the GCK, HNF-1α genes were examined by PCR-DHPLC (Polymerase Chain Reaction - Denaturing High Performance Liquid Chromatography) and direct sequencing. We extracted DNA from 11 patients and 20 normals. Then we confirmed a single-nucleotide polymorphism using PCR-DHPLC. As results, we identified one mutation (R135G) in GCK gene and two mutations (I27L, S487N) in HNF-1a and at the same time detected mutation in intron 8.
Analysis of Cognitive Acceleration Effects in Implementing the Thinking Science Program to Secondary School Students by Delayed Test
Lee, Sang-Kwon ; Choi, Byung-Soon ; Shin, Ae-Kyung ; Ree, Jong-Baik ; Paek, Myeong-Hwa ;
Journal of the Korean Chemical Society, volume 51, issue 6, 2007, Pages 549~559
DOI : 10.5012/jkcs.2007.51.6.549
The purpose of this study was to investigate cognitive acceleration effect of the experimental group over three years compared with the control group through the ‘Thinking Science' program in the middle school students. The ‘Thinking Science' program was implemented to 168 students in 7th grade over a period of two years. After implementation of the ‘Thinking Science' program, the improvement of formal thinking ability of the students was almost twice examined with SRT VII as the post-test and the delayed test. It was shown that by the end of the implementation period the experimental group had achieved a significantly greater gain score in levels of cognitive development than had the control group. In the subsequent year during which there was no further implementation, the experimental group continued to develop at the same rate as the control group. However, it is clear that much more experimental students in mature concrete operational stage shifted to formal operational stage in delayed test. The results were also analyzed by gender, and cognitive levels of the students. In the post-test, the ratio of girls that shifted to formal operation stage in the experimental group increased as compared with the ratio of boys, while, in the delayed test cognitive level of boys was more effective than that of girls.
Studies of the Concept and Terminology of Heavy Metals Described in the Chemistry I Textbook
Moon, Kyung-Ah ; Chae, Hee-K. ;
Journal of the Korean Chemical Society, volume 51, issue 6, 2007, Pages 560~568
DOI : 10.5012/jkcs.2007.51.6.560
The aim of this study is to investigate the terminology of chemically unclear ‘heavy metals' which were expressed in the Korean secondary science textbook in terms of the definition, the type and the meaning. Initial results showed that six of ‘Chemistry I' textbooks among these texts defined a heavy metal with the density and described it as a metal which is hazardous and continuously accumulated in the human body. Specifically, cadmium, lead and mercury were presented as examples of the hazardous metal in all of the eight textbooks but non-metals such as arsenic and absolutely essential metals including chrome, manganese, iron, cobalt, nickel and copper were also given in the texts. Most of the texts described the hazardousness and toxicity of the metal too simple to understand the mechanism of its intoxication despite considering all of the factors including its oxidation state, residual amount and reactivity with biomolecules of the human body. Such an ambiguous definition and explanation may excluded in the textbook because the chemically undefined chemical vocabulary leads students to cause an alternative conception of the heavy metal, which means that the metal could be identical with toxins.
The Effect of Grouping by Communication Apprehension Level in Paired Think-Aloud Problem Solving for Middle School Chemistry
Kang, Hun-Sik ; Lee, Jeong-Soon ; Kim, Kyung-Sun ; Jeon, Kyung-Moon ; Noh, Tae-Hee ;
Journal of the Korean Chemical Society, volume 51, issue 6, 2007, Pages 569~576
DOI : 10.5012/jkcs.2007.51.6.569
In this study, the effect of grouping by communication apprehension level in paired think-aloud problem solving was examined. Three classes of 9th graders (N=99) were randomly assigned to a control group, homogeneous group or heterogeneous group based on the test scores of their communication apprehension. After the instructions concerning ‘writing balanced chemical equation', ‘the law of conservation of mass', and ‘the law of definite proportions' for 7 class hours, students' chemistry problem solving ability and the perception to the paired think-aloud problem solving were examined. Two-way ANOVA results revealed that there was an interactive effect in the score of chemistry problem solving ability test. In simple effect test for the students of low communication apprehension, the scores of the heterogeneous group were found to be significantly higher than those of the control group. However, the students in homogeneous group had relatively positive perceptions to the paired think-aloud problem solving.
Misunderstanding and Understanding of the Phase Diagram for Water: Water Evaporation and Ice Sublimation in the Atmosphere
Park, Jong-Yoon ;
Journal of the Korean Chemical Society, volume 51, issue 6, 2007, Pages 577~584
DOI : 10.5012/jkcs.2007.51.6.577
The purpose of this study is to suggest how to use the phase diagram for water to explain the evaporation and sublimation in the atmospheric condition. In principle, the phase diagram for water represents a one component system so it cannot be applied to the water contact with the air. When the liquid or solid phase of water exists in the air, always water vapor also exists in the air. In this case, we cannot present this state as a single point on the phase diagram because the pressure of the liquid or solid is different from that of the vapor in the air. However, since the saturation vapor pressure of liquid or solid is altered by negligible amount due to the presence of air, the evaporation and sublimation in the atmospheric condition can be explained using the vapor pressure line and sublimation line on the phase diagram.
The Synthesis of Coenzyme Qn Derivatives
Choi, Won-Sik ; Eo, Jin-Yong ; Nam, Seok-Woo ; Kim, Jae-Hoon ; Lee, Young-Haeng ;
Journal of the Korean Chemical Society, volume 51, issue 6, 2007, Pages 585~590
DOI : 10.5012/jkcs.2007.51.6.585
Solvent-free Synthesis, X-ray Structure Analysis and Electrochemical Properties of Ferrocenylchalcone containing Naphtalenyl Group
Son, Kyung-In ; Noh, Dong-Youn ;
Journal of the Korean Chemical Society, volume 51, issue 6, 2007, Pages 591~594
DOI : 10.5012/jkcs.2007.51.6.591
Hydrothermal Synthesis and Crystal Structure of [Co(phen)
Koo, Bon-Kweon ; Kim, Jung-Sook ; Lim, Woo-Taik ;
Journal of the Korean Chemical Society, volume 51, issue 6, 2007, Pages 595~599
DOI : 10.5012/jkcs.2007.51.6.595