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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 57, Issue 6 - Dec 2013
Volume 57, Issue 5 - Oct 2013
Volume 57, Issue 4 - Aug 2013
Volume 57, Issue 3 - Jun 2013
Volume 57, Issue 2 - Apr 2013
Volume 57, Issue 1 - Feb 2013
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Corrosion and Passivation of Nickel Rotating Disk Electrode in Borate Buffer Solution
Kim, Younkyoo ;
Journal of the Korean Chemical Society, volume 57, issue 5, 2013, Pages 533~539
DOI : 10.5012/jkcs.2013.57.5.533
The electrochemical corrosion and passivation of Ni rotating disk electrod in borate buffer solution was studied with potentiodynamic and electrochemical impedance spectroscopy. The mechanisms of both the active dissolution and passivation of nickel and the hydrogen evolution in reduction reaction were hypothetically established while utilizing the Tafel slope, impedance data, the rotation speed of Ni-RDE and the pH dependence of corrosion potential and current. Based on the EIS data, an equivalent circuit was suggested. In addition, carefully measured were the electrochemical parameters for specific anodic dissolution regions. It can be concluded from the data collected that the
oxide film, which is primarily formed by passivation, is converted to NiO by dehydration under the influence of an electrical field.
The Effect of Nonrandom Distribution of Molecules on the Equation of State for Gases
Jung, Hae-Young ;
Journal of the Korean Chemical Society, volume 57, issue 5, 2013, Pages 540~546
DOI : 10.5012/jkcs.2013.57.5.540
Using the free volume of van der Waals equation, Carnahan-Starling equation for hard spheres, Wilson equation for nonrandom mixing of solution, NRTL equation and our equation, several new equations of states for pure gases are derived. Using these equations, compressibility factors for pure gases are calculated and compared with Nelson-Obert generalized compressibility factor charts. The equation of states using the concept of molecular nonrandom distribution gave better results than those of molecular random distribution. This shows that the molecular nonrandom distribution makes considerable effect on the equation of states.
Fabrication and Characterization Nano Porous Anodic ZrO
Membranes by Two-Step Anodizing
Seo, Eui-Young ; Choi, Se-Kyeong ; Shin, Ik-Soo ; Kang, Wee-Kyung ;
Journal of the Korean Chemical Society, volume 57, issue 5, 2013, Pages 547~553
DOI : 10.5012/jkcs.2013.57.5.547
Zirconium oxide (
) nano porous membranes were fabricated by electrochemical two-step anodization with an electropolished zirconium substrate in inorganic water-based and organic electrolyte systems containing small amounts of fluoride. Using two-step anodization and organic electrolytes, highly regular and ordered nanotubular
oxide layers can be compared with aqueous electrolytes. The morphology and size of the nano porous layers were characterized by FE-SEM (field emission scanning electron microscopy), XRD (X-ray diffraction), and EDS (energy dispersive spectroscopy). Luminescence properties were investigated by photoluminescence measurements.
Computational Studies of the β-D Glucopyranose Structure
Yang, Ji-Hyun ; Kim, Jinah ; Lee, Sangmin ; Ahn, Ik-Sung ; Mhin, ByungJin ;
Journal of the Korean Chemical Society, volume 57, issue 5, 2013, Pages 554~559
DOI : 10.5012/jkcs.2013.57.5.554
In this study, we have investigated potential energy of
-D-glucopyranose in vacuum and implicit water condition. By Comparing two conditions we find that how solvation energy influence
-D-glucopyranose structure. We use AMBER package program and GLYCAM_06 force field. Solvation model was used for the generalized Born model with Hawkins, Cramer, Truhlar has been proposed. We conclude that difference of contour map of two conditions is caused by solvation effect by reducing hydrogen bonding interaction.
Synthesis, Characterization and Spectrophotometric Studies of Seven Novel Antibacterial Hydrophilic Iron(II) Schiff Base Amino Acid Complexes
Shaker, Ali M. ; Nassr, Lobna A.E. ; Adam, Mohamed S.S. ; Mohamed, Ibrahim M.A. ;
Journal of the Korean Chemical Society, volume 57, issue 5, 2013, Pages 560~567
DOI : 10.5012/jkcs.2013.57.5.560
A series of new Iron(II) Schiff base amino acid complexes derived from the condensation of amino acid and sodium 2-hydroxybenzaldehyde-5-sulfonate have been synthesized. The complexes were characterized by elemental, electronic, IR spectral analyses and conductance measurements. The stability and solubility of the prepared complexes were determined. Two spectral methods used to determine the stoichiometry of the prepared complexes which exhibited divalent tridentate coordination and formed chelates of octahedral structures. The antibacterial activity of the prepared complexes has been tested against Bacillus cereus, Pseudomonas aeruginosa and Micrococcus bacteria. The effect of HCl on investigated complexes studied spectrophotometrically.
Determination of Ultra Trace Levels of Copper in Whole Blood by Adsorptive Stripping Voltammetry
Attar, Tarik ; Harek, Yahia ; Larabi, Lahcen ;
Journal of the Korean Chemical Society, volume 57, issue 5, 2013, Pages 568~573
DOI : 10.5012/jkcs.2013.57.5.568
A selective and sensitive method for simultaneous determination of copper in blood by adsorptive differential pulse cathodic stripping voltammetry is presented. The procedure involves an adsorptive accumulation of Cu(II)-ETSC (4- ethyl-3-thiosemicarbazide) on a hanging mercury drop electrode, followed by a stripping voltammetry measurement of reduction current of adsorbed complex at about -715 mV. The optimum conditions for the analysis of copper (II) ion are : pH 10.3, concentration of 4-ethyl-3-thiosemicarbazide
M and an accumulation potential of -100 mV. The peak current is proportional to the concentration of copper over the range 0.003-125 ng/mL with a detection limit of 0.001 ng/mL and an accumulation time of 60 s. Moreover, with the use of the proposed method, there is a considerable improvement in the detection limit, the linear dynamic range and the deposition time, compared with the methods of adsorptive stripping voltammetry for the determination of copper. The developed method was validated by analysis of whole blood certified reference materials.
Synthesis, Characterization, DFT Modeling and Antimicrobial Studies on the Ti(IV), Y(III) and Ce(IV) Ofloxacin Solid Complexes
Sadeek, Sadeek A. ; Zordok, Wael A. ; El-Shwiniy, Walaa H. ;
Journal of the Korean Chemical Society, volume 57, issue 5, 2013, Pages 574~590
DOI : 10.5012/jkcs.2013.57.5.574
A new solid complexes of Ti(IV), Y(III) and Ce(IV) have been synthesized with ofloxacin. The formulae and structure of the complexes have been proposed in the light of analytical, spectral (
NMR, IR and UV-Visible), magnetic, molar conductivities and thermal studies. The complexes are soluble in DMSO-
and DMF. The measured molar conductance values indicate that, the three complexes are electrolyte in nature. The results support the formation of the complexes and indicated that ofloxacin reacts as a bidentate ligand chelate to the metal ion through the pyridone oxygen and one carboxylato oxygen. The kinetic parameters of thermogravimetric and its differential have been evaluated by using Coats Redfern (CR) and Horowitz-Metzeger (HM) methods. The thermodynamic data reflect the thermal stability for all complexes. The metal- ligand binding of the Ti(IV), Y(III) and Ce(IV) complexes is predicted using density funcational theory at the B3LYP-CEP-31G level of theory and total energy, dipole moment estimation of different Ti(IV), Y(III) and Ce(IV) ofloxacin structures. The biological activities of the ofloxacin, inorganic salts and their metal complexes were assayed against different bacterial species.
Design, Synthesis and Catalytic Property of L-Proline Derivatives as Organocatalysts for Direct Aldol Reaction
Wang, Lei ; Tang, Ruiren ; Yang, Hua ;
Journal of the Korean Chemical Society, volume 57, issue 5, 2013, Pages 591~598
DOI : 10.5012/jkcs.2013.57.5.591
A series of chiral prolinamide compounds with pyridine-2, 6-dicarboxylic acid moieties derived from L-proline have been designed and synthesized, their catalytic properties for direct asymmetric aldol reactions were also studied in this article. These catalysts gave the aldol product in high yield (87%) and high enantioselectivity, up to 85%, of the anti-structure at room temperature but gave disappointing results at a lower temperature or when additive was added. Conditions, including solvents, temperature and additives were screened for the reactions. Moreover, the influence of presence of water on yield and stereoselectivity was also discussed.
Solvent-Free Synthesis of Some1-Acetyl Pyrazoles
Thirunarayanan, Ganesamoorthy ; Sekar, Krishnamoorthy Guna ;
Journal of the Korean Chemical Society, volume 57, issue 5, 2013, Pages 599~605
DOI : 10.5012/jkcs.2013.57.5.599
Some N-acetyl pyrazoles including 1-(3-(3,4-dichlorophenyl)-5-(substituted phenyl)-4,5-dihydro-
-pyrazole- 1-yl) ethanones have been synthesised by solvent free cyclization cum acetylation of chalcones like substituted styryl 3,4- dichlorophenyl ketones using hydrazine hydrate and acetic anhydride in presence of catalytic amount of fly-ash:
catalyst. The yield of these N-acetyl pyrazole derivatives are more than 75%. The synthesised N-acetyl pyrazoline derivatives were characterized by their physical constants and spectral data.
Oxidative Cyclisation Based One-Pot Synthesis of 3-Substituted[1,2,4]triazolo[4,3-b]pyridazines Using Me
Ruso, Jayaraman Sembian ; Nagappan, Rajendiran ; Kumaran, Rajendran Senthil ;
Journal of the Korean Chemical Society, volume 57, issue 5, 2013, Pages 606~611
DOI : 10.5012/jkcs.2013.57.5.606
A facile one-pot syhthesis of 3-substituted triazolopyridazine and thieno-triazolopyridazine derivatives is described. This protocol involves the preparation of heteroaryl hydrazone from the aldehyde and pyridazinohydrazine derivative followed by subjecting the intermediate directly to oxidative cyclization to assemble the desired 1,2,4-triazloe moiety by employing the mixture of Me4NBr and oxone. This condition is efficient and is able to tolerate wide range of functional groups.
Synthesis of New Pyrazolo[5,1-c]triazine, Triazolo[5,1-c]triazine, Triazino[4,3-b]indazole and Benzimidazo[2,1-c]triazine Derivatives Incorporating Chromen-2-one Moiety
Khalil, Mohamed A. ; Sayed, Samia M. ; Raslan, Mohamed A. ;
Journal of the Korean Chemical Society, volume 57, issue 5, 2013, Pages 612~617
DOI : 10.5012/jkcs.2013.57.5.612
The versatile, hitherto unreported 3-(4-(2-phenyldiazenyl)-2-oxo-2H-chromen-3-yl)-3-oxopropanenitrile 3 was prepared by two convenient routes: either by the reaction of ethyl 4-(2-phenyldiazenyl)-2-oxo-2H-chromen-3-carboxylate 2 with acetonitrile in the presence of sodium hydride or by treatment of 4-(2-phenyldiazenyl)-3-(2-bromoacetyl)-2H-chromen-2- one 5 with potassium cyanide. Reaction of 3 with heterocyclic diazonium salts 6, 7, 14 and 17 furnished the corresponding hydrazones 8, 9, 15 and 18. The latter hydrazones underwent intramolecular cyclization into the corresponding pyrazolo[5,1- c]-1,2,4-triazine 10, 1,2,4-triazolo[5,1-c]-1,2,4-triazine 11, 1,2,4-triazino[4,3-b]indazole 16 and imidazo[2,1-c]-1,2,4-triazine 19 derivatives, respectively upon refluxing in pyridine.
Controll over the Au@Ag Core-shell Nanoparticle 2D Patterns via Diblock Copolymer Inverse Micelle Templates and Investigation of the Surface Plasmon Based Optical Property
Yoon, Min Ji ; Kim, Jihyeon ; Jang, Yoon Hee ; Lee, Ji-Eun ; Chung, Kyungwha ; Quan, Li Na ; Kim, Dong Ha ;
Journal of the Korean Chemical Society, volume 57, issue 5, 2013, Pages 618~624
DOI : 10.5012/jkcs.2013.57.5.618
We demonstrated unique inter- and intra-plasmonic coupling effects in bimetallic Au@Ag core-shell NP arrays which are regularly or randomly arranged on self-assembled block copolymer (BCP) inverse micelle monolayers. Polyvinylpyrrolidone (PVP)-stabilized Au@Ag core-shell NP arrays in regular or disordered configuration were incorporated and assembled on reconstructed PS-b-P4VP inverse micelle templates through two types of processes. The intensively enhanced LSPR coupling properties of individual and assembled Au@Ag NPs were evaluated by UV-visible spectroscopy in terms of the type of ligand stabilizer, coupling between Au and Ag, thickness of Ag shell, and type of array configuration. Finally, Au@Ag core-shell NP arrays were employed as active substrates for surface enhanced Raman spectroscopy (SERS) and a significantly enhanced signal enhancement was observed in accordance with the coupling intensity of Au@Ag NPs patterns.
Polycyclotriphosphazene Derivative Grafted and NanometerY
Doped SPEEK Composite Membrane for DMFC
Li, Xia ; Guo, Qiang ; Zhang, Tianjiao ; Qian, Junzhi ; Tan, Xiaolin ;
Journal of the Korean Chemical Society, volume 57, issue 5, 2013, Pages 625~633
DOI : 10.5012/jkcs.2013.57.5.625
A type of polycyclotriphosphazene derivative (PCTPD), hexasulfanilic acid polycyclotriphosphazene (HSACP) and HSACP grafting SPEEK, sulfonated poly[2-(petachloropolycyclotriphosphazene-oxy)] etheretherketone (SPPSACPEEK) were synthesized, which were characterized by FTIR and
NMR. Then three types of composite membranes such as HSACP grafting SPEEK, HSACP blending SPEEK, and nano
doping and HSACP grafting SPEEK, respectively, were continuously prepared by solution-casting method. Comparing to SPEEK membranes with different amount of HSACP grafted or blended, grafting 15 wt% HSACP and doping 10 wt% nano
SPEEK membrane conducted outstanding overall behavior of proton conductivity reaching
which was merely junior to SPEEK with 15 wt% HSACP grafted, methanol permeability coefficient getting
, swelling degree of 20.9% and solid residue of 98.98% which was superior to all specimen.
Preparation of Gold Coated Liposomes for CT Contrast Medium
Wee, Tae In ; Jeon, Ye Won ; Cho, Young Jae ; Cho, Sung Keun ; Ha, Jeung ; Lee, Jeong Won ; Cho, Sun Hang ; Han, Hee Dong ; Shin, Byung Cheol ;
Journal of the Korean Chemical Society, volume 57, issue 5, 2013, Pages 634~639
DOI : 10.5012/jkcs.2013.57.5.634
The use of medical imaging has been increased for diagnosis of cancer or vessel disease. Among the medical imaging, computed tomography (CT) is one of the popular methods, however, which should need administration of contrast medium. Therefore, we developed gold coated liposomes (GCL) as a contrast medium. To coat gold on the liposomal surface, positive charged liposomes was prepared and then negative
can coat on the liposomal surface by electronic interaction. The size of GCL was
nm and surface charge was
mV, respectively. The morphology of GCL was confirmed by electron microscopy (SEM) and transmission electron microscopy (TEM). The coating efficiency of gold was 18%. Chemical procedure for gold coating on liposomal surface was not toxic for cell cytotoxicity by MTT assay. Finally, we demonstrated attractive CT image for GCL. Taken together, the GCL would be useful for various vessel related disease as a contrast medium.
Analysis of the Level of Cognitive Demands about Concepts of the Changes of State and Kinetic Theory on 'Science 1' Textbooks in Junior High School (III)
Park, Jieun ; Park, Yesul ; Kang, Soonhee ;
Journal of the Korean Chemical Society, volume 57, issue 5, 2013, Pages 640~655
DOI : 10.5012/jkcs.2013.57.5.640
The purpose of this study is to analyze the cognitive demands level of the description about 'changes of state' and 'kinetic theory' on the 'science 1' textbooks by the 2007 revised curriculum. The three types of curriculum analysis taxonomy have been used to analyze the cognitive demands level of those contents on the 6 kinds of 'science 1' textbooks. The most higher level of cognitive demands about the concepts have been discussed here due to the focus of the concepts. The first, the cognitive demand level about 'three states of substances' depending on the motion of their particles in 6 textbooks is a early formal operational stage because of using by the application of kinetic theory. The second, the cognitive demand level about 'diffusion' and 'evaporation' is a early formal operational stage, because the particles move around faster so they can change their position. The third, the cognitive level of the pressure and volume in a gas is a early formal operational stage because of explaining only phenomena in simple correspondence with formal model of kinetic theory. And simple functional relationships beyond linear on the graph of the volume and pressure of gas, the volume and temperature of gas is also a early formal operational stage. The fourth, the cognitive level of the energy of heat by a change of the state is also a early formal operational stage because kinetic theory picture accepted as providing explanation by the change of the state. And functional relationships beyond linear on the graph of the explanation of boiling point of water in water is also a early formal operational stage.