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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 56, Issue 6 - Dec 2012
Volume 56, Issue 5 - Oct 2012
Volume 56, Issue 4 - Aug 2012
Volume 56, Issue 3 - Jun 2012
Volume 56, Issue 2 - Apr 2012
Volume 56, Issue 1 - Feb 2012
Selecting the target year
Isentropic Compressibility for Binary Mixtures of Propylene Carbonate with Benzene and Substituted Benzene
Wankhede, D.S. ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 7~13
DOI : 10.5012/jkcs.2012.56.1.007
Ultrasonic velocities (u) for binary mixtures of propylene carbonate (PC) (1) with benzene and substituted benzenes (2) viz. benzene, ethylbenzene, o-xylene and p-xylene have been measured at 288.15-308.15 K over the entire range of composition. The experimental values of ultrasonic velocities (u) have been utilized to calculate isentropic compressibility (
), intermolecular free length (
), acoustic impedance (Z).
Density Functional Theory Study of Competitive Reaction Pathways of Ti
with Fluorinated Acetone in the Gas Phase
Hong, Ki-Ryong ; Kim, Tae-Kyu ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 14~19
DOI : 10.5012/jkcs.2012.56.1.014
We investigate the doublet and quartet potential energy surfaces associated with the gas-phase reaction between
for two plausible reaction pathways,
formation pathways by using the density functional theory (DFT) method. The molecular structures of intermediates and transition states involved in these reaction pathways are optimized at the DFT level by using the PBE0 functional. All transition states are identified by using the intrinsic reaction coordinate (IRC) method, and the resulting reaction coordinates describe how
as products. On the basis of presented results, we propose the most favorable reaction pathway in the reaction between
Study of Dynamics of Allyl Chloride-2-Butanone Binary System Using Time Domain Reflectometry
Sudake, Y.S. ; Kamble, S.P. ; Patil, S.S. ; Khirade, P.W. ; Mehrotra, S.C. ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 20~27
DOI : 10.5012/jkcs.2012.56.1.020
Complex permittivity spectra of Allyl Chloride (AC), 2-Butanone (2-BU) and their binary mixtures over the entire range of concentration were obtained using the Time Domain Reflectometry (TDR) technique in microwave frequency range at various temperatures. Static dielectric constant and relaxation time are obtained from complex permittivity spectra. Density (
) and refractive index (
) are also measured. These parameters are used to determine excess dielectric constant, excess inverse relaxation time, excess molar volume, excess molar refraction, polarity, Bruggeman factor and thermodynamic parameters viz. enthalpy of activation and entropy of activation. The values of static dielectric constant and relaxation time increases while density and refractive index decreases with the percentage of 2-Butanone in Allyl Chloride increases. Excess parameters were fitted to a Redlich-Kister equation.
Kinetics and Mechanism of Ruthenium(III) Catalyzed Oxidation of Butanone and Uncatalyzed Oxidation of Cychlohexanone by Cerium(IV) in Acid Sulphate Medium
Sharma, Priyamvada ; Hemkar, Shalini ; Khandelwal, C.L. ; Sharma, P.D. ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 28~33
DOI : 10.5012/jkcs.2012.56.1.028
The kinetics of ruthenium(III) chloride catalyzed oxidation of butanone and uncatalyzed oxidation of cyclohexanone by cerium(IV) in sulphuric acid medium have been studied. The kinetic rate law(I) in case of butanone conforms to the proposed mechanism.
(1). However, oxidation of cyclohexanone in absence of catalyst accounts for the rate eqn. (2).
(2) Kinetics and activation parameters have been evaluated conventionally. Kinetically preferred mode of reaction is via ketonic and not the enolic forms.
Carbon Nanotubes Doped with Nitrogen, Pyridine-like Nitrogen Defects, and Transition Metal Atoms
Mananghaya, Michael R. ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 34~46
DOI : 10.5012/jkcs.2012.56.1.034
Dopants and defects can be introduced as well as the intercalation of metals into single wall carbon nanotubes (SWCNTs) to modify their electronic and magnetic properties, thus significantly widening their application areas. Through spinpolarized density functional theory (DFT) calculations, we have systemically studied the following: (i) (10,0) and (5,5) SWCNT doped with nitrogen (
), (ii) (10,0) and (5,5) SWCNT with pyridine-like defects (3NV-
), and (iii) chemical functionalization of (10,0) and (5,5) 3NV-
with 12 different transition metals (TMs) (Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Pd, and Pt). Attention was done in searching for the most stable configurations, deformation, calculating the formation energies, and exploring the effects of the doping concentration of nitrogen and pyridine-like nitrogenated defects on the electronic properties of the nanotubes. Also, calculating the corresponding binding energies and effects of chemical functionalization of TMs on the electronic and magnetic properties of the nanotubes has been made. We found out that the electronic properties of SWCNT can be effectively modified in various ways, which are strongly dependent not only on the concentration of the adsorbed nitrogen but also to the configuration of the adsorbed nitrogen impurities, the pyridine-like nitrogenated defects, and the TMs absorbed; due to the strong interaction between the d orbitals of TMs and the p orbitals of N atoms, the binding strengths of TMs with the two 3NV-
are significantly enhanced when compared to the pure SWCNTs.
Growth Kinetics and Electronic Properties of Passive Film of Zinc in Borate Buffer Solution
Chung, Se-Jin ; Kim, Youn-Kyoo ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 47~53
DOI : 10.5012/jkcs.2012.56.1.047
We have investigated the growth kinetics and electronic properties of passive film of zinc in borate buffer solution. The oxide film formed in passivation process of zinc has showed the electronic properties of n-type semiconductor based on the Mott-Schottky equation. And it was found out that the oxide film consisted ZnO and
was composed of deep and shallow donors.
Synthesis and Characterization of Derivatives of Dibutyl Sn(IV)-Ti(IV)-μ-Oxoisopropoxide with Schiff Bases
Kumar, Rajesh ; Sharma, H.K. ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 54~57
DOI : 10.5012/jkcs.2012.56.1.054
New Schiff base derivatives of organoheterobimetallic-
have been synthesized by the thermal condensation
-oxoisopropoxide compound with Schiff bases in different molar ratios (1:1-1:4) yielded the compounds of the type
(where n is 1-4 and SB=Schiff base anion) respectively. The
-oxoisopropoxide derivatives have been characterized by elemental, spectral analysis (IR,
NMR) and molecular weight measurement The studies reveal that the derivative compounds show monomeric nature. Further these are found less susceptible to hydrolysis as compared to parent compound and may prove excellent precursors for the mixed metal oxides.
Solvent Extraction of Platinum (IV) with 4-(4-Ethoxybenzylideneamino)-5-methyl-4H-1,2,4-triazole-3-thiol (EBIMTT) from Hydrochloric Acid Media
Shaikh, Uzma parveen K. ; Dhokte, Aashish O. ; Lande, Machhindra K. ; Arbad, Balasaheb R. ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 58~61
DOI : 10.5012/jkcs.2012.56.1.058
The solvent extraction of platinum (IV) metal from hydrochloric acid media using 4-(4-ethoxybenzylideneamino)-5-methyl-4H-1,2,4-triazole-3-thiol (EBIMTT) in chloroform was studied as a function of several variables, such as reagent, acid and metal ion concentration, effect of various diluents, and diverse ions. The proposed method was further applied for the separation of platinum (IV) from binary mixtures, synthetic mixtures, alloys and commercially available samples.
Synthesis and Characterization of Homo Binuclear Macrocyclic Complexes of UO
(VI), Th(IV), ZrO(IV) and VO(IV) with Schiff-Bases Derived from Ethylene diamine/Orthophenylene Diamine, Benzilmonohydrazone and Acetyl Acetone
Mohapatra, R.K. ; Ghosh, S. ; Naik, P. ; Mishra, S.K. ; Mahapatra, A. ; Dash, D.C. ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 62~67
DOI : 10.5012/jkcs.2012.56.1.062
A series of homo binuclear complexs of the type
, L=1,5,6,9,12,15,16,20 octaaza-7,813,14-tetraphenyl-2,4,17,19-tetramethyl-1,4,6,8,12,14,16,19-docosaoctene (OTTDO) or L'=10:11;21:22-dibenzo-1,5,6,9,12,15,16,20-octaaza-7,813,14-tetraphenyl-2,4,17,19-tetramethyl-1,4,6,8,12,14,16,19-docosaoctene (DOTTOT), n=4 for
m=1,2,3 respectively, have been synthesized in template method from ethylenediamine/orthophenylene diamine, benzil monohydrazone and acetyl acetone and characterized on the basis of elemental analysis, thermal analysis, molar conductivity, magnetic moment, electronic, infrared,
-NMR studies. The results indicate that the VO(IV) ion is penta co-ordinated yielding paramagnetic complexes;
, ZrO(IV) ions are hexa co-ordinated where as Th(IV) ion is octa co-ordinated yielding diamagnetic complexes of above composition. The fungi toxicity of the ZrO(IV) and VO(IV) complexes against some fungal pathogen has been studied.
Synthesis and Biological Evaluation of Novel Isopropyl 2-thiazolopyrimidine-6-carboxylate Derivatives
Kotaiah, Y. ; Krishna, N. Hari ; Raju, K. Naga ; Rao, C.V. ; Jonnalagadda, S.B. ; Maddila, Suresh ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 68~73
DOI : 10.5012/jkcs.2012.56.1.068
In the present study, we have synthesized novel Isopropyl 2-(4-substitutedbenzylidene)-5-methyl-3-oxo-7-phenyl-3,7-dihydro-2H-thiazolo[3,2-a]-pyrimidine-6-carboxylate derivatives (6a-j). Elemental analysis, IR,
NMR and mass spectral data elucidated structure of newly synthesized compounds. The newly synthesized compounds were screened for antiinflammatory and anti microbial studies. Their biological activity data of the 10 compounds indicates that two compounds posses potent anti-inflammatory and five have antimicrobial activities.
Quick Access to Bis(indolyl)methanes: T3P as a Novel Catalyst System
Prasanna, T.S.R. ; Raju, K. Mohana ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 74~77
DOI : 10.5012/jkcs.2012.56.1.074
A new catalytic system has been developed in the synthesis of bis(indolyl)methanes using cyclic phosphonic acid anhydride(T3P). Short reaction time, simplicity of isolation, safe catalyst and high yields of product are the features.
New Synthesis of Perhydrotriazolotriazoles Catalyzed by TiCl
under Ambient Conditions
Safari, J. ; Gandomi-Ravandi, S. ; Ghotbinejad, M. ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 78~81
DOI : 10.5012/jkcs.2012.56.1.078
Aromatic 2,3-diazabuta-1,3-dienes in glacial acetic acid with isothiocyanate in the presence of catalyst
at room temperature produced via criss-cross cycloaddition reactions the corresponding perhydro[1,2,4]triazolo[1,2-a][1,2,4] triazole-1,5-dithiones in relatively high yields and short reaction time.
Synthesis, Tautomeric Structure, Dyeing Characteristics, and Antimicrobial Activity of Novel 4-(2-Arylazophenyl)-3-(2-hydroxyphenyl)-1-phenyl-2-pyrazolin-5-ones
Metwally, M.A. ; Bondock, S.A. ; El-Desouky, S.I. ; Abdou, M.M. ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 82~91
DOI : 10.5012/jkcs.2012.56.1.082
Novel azopyrazolin-5-one dyes 4a-f were synthesized by the regioselective reaction of phenylhydrazine with 2,3,4-chromantrione-3-arylhydrazones 2a-f. The acid dissociation constants
for the series prepared were determined and correlated by the Hammett equation. The results of such correlation together with the spectral data indicated that the studied compounds exist predominantly in the hydrazone keto structure, (D) as the Z-configuration. The dyes were applied to polyester fabrics, affording orange-yellow shades and assessments of their dyeing performance are considered. Further, the compounds 4a-f were screened for their antimicrobial activity against various microorganisms.
Photo-Assisted Sondegradation of Hydrogels in the Presence of TiO
Ebrahimi, Rajabali ; Tarhandeh, Giti ; Rafiey, Saeed ; Narjabadi, Mahsa ; Khani, Hamed ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 92~101
DOI : 10.5012/jkcs.2012.56.1.092
The degradation of one of the commercially important hydrogel based on acrylic acid and acryl amide, (acrylic acid-co-acryl amide) hydrogels, by means of ultrasound irradiation and its combination with heterogeneous (
) was investigated. 24 kHz of ultrasound irradiation was provided by a sonicator, while an ultraviolet source of 16 W was used for UV irradiation. The extent of sonolytic degradation increased with increasing ultrasound power (in the range 30-80 W).
sonophotocatalysis led to complete (acrylic acid-co-acryl amide) hydrogels degradation with increasing catalyst loading, while, the presence of
in the dark generally had little effect on degradation. Therefore, emphasis was totally on the sonolytic and sonophotocatalytic degradation of hydrogels and a synergy effect was calculated for combined degradation procedures (Ultrasound and Ultraviolet) in the presence of
sonophotocatalysis was always faster than the respective individual processes due to the enhanced formation of reactive radicals as well as the possible ultrasound-induced increase of the active surface area of the catalyst. A kinetics model based on viscosity data was used for estimation of degradation rate constants at different conditions and a negative order for the dependence of the reaction rate on total molar concentration of (acrylic acid-co-acryl amide) hydrogels solution within the degradation process was suggested.
Preparation and Application of ITO Hollow Spheres
Im, Jung-Sup ; Hwang, Byung-Woo ; Jung, Dong-Woon ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 102~107
DOI : 10.5012/jkcs.2012.56.1.102
Hollow ITO powders were prepared by using polystyrene powders as a template. The specific gravity of the prepared hollow ITO powders was less than half compared with that of normal ITO spheres. As a result, the mismatch between the specific gravity of ITO and that of polymer solution was reduced. When the prepared hollow ITO powders and the polymer solutions are mixed, some portion of the hollow particles were collapsed and generated lots of small fragments. Thousands of the broken fragments from hollow ITO powders caused the increased contact area between particles and finally resulted in the higher electrical conductivity for the coating solution made of the prepared hollow ITO powders and the polymer solution.
Efficient Photocatalytic Degradation of Salicylic Acid by Bactericidal ZnO
Karunakaran, Chockalingam ; Naufal, Binu ; Gomathisankar, Paramasivan ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 108~114
DOI : 10.5012/jkcs.2012.56.1.108
Salicylic acid degrades at different rates under UV-A light on
, ZnO, CuO,
nanocrystals and all the oxides exhibit sustainable photocatalysis. While ZnO-photocatalysis displays Langmuir-Hinshelwood kinetics the others follow first order on [salicylic acid]. The degradation on all the oxides enhance with illumination intensity. Dissolved oxygen is essential for the photodegradation. ZnO is the most efficient photocatalyst to degrade salicylic acid. Besides serving as the effective photocatalyst to degrade salicylic acid it also acts as a bactericide and inactivates E.coli even in absence of direct light.
Elementary and Secondary School Teachers' Perceptions on Inter-Disciplinary Science Education(IV)
Bang, Dam-I ; Kang, Soon-Hee ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 115~127
DOI : 10.5012/jkcs.2012.56.1.115
This is a survey research which investigated perceptions of 85 elementary and secondary school science teachers on inter-disciplinary teaching in general. It is expected that the results of this survey will help to find out the necessity, the appropriate time, the proper approach and the obstacles of inter-disciplinary education. Results indicated that 49.5% of the teachers were aware of inter-disciplinary teaching and 61.2% of the teachers agreed with the necessity of implementing inter-disciplinary strategy. However, considering difficulties in objective assessment and burdens of college entrance exam preparation, they responded that inter-disciplinary teaching could be more appropriate and feasible to be implemented for lower graders at elementary schools than secondary school students. Of the answers to the integrated approaches, 57.6% of teachers chose the theme-based approach, and 16.5% chose the problem-based approach. When they chose the theme-based approach, they stated the reason of educational readiness. On the other hand, when they chose the problem-based approach, they stated the reason of educational obligation which assumes that a problem solving needs inter-disciplinary approach. The teachers also selected 'lack of knowledge on other subjects' and 'lack of time to prepare teaching materials' as major predicaments in implementing inter-disciplinary approach. This suggests that there needs a clear and specific teaching strategy along with a guidance to teaching materials for inter-disciplinary teaching.
The Level of Secondary School Science Teachers' PCK on Density and the Characteristics of Eight Aspects of CoRe by the Level of PCK
Kwak, Sang-Won ; Choi, Byung-Soon ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 128~136
DOI : 10.5012/jkcs.2012.56.1.128
The purposes of this study were to evaluate the level of PCK which middle school science teachers have on the concept of density and to analyze the characteristics of science teachers' content representation on the concept of density by their PCK level. For that purpose, 20 science teachers were selected and asked to answer the questionnaire on the eight aspects of CoRe. Results of this study indicated that the science teachers' PCK levels were low in general and evaluated as below average. The differences among the characteristics of science teachers' content representation by their PCK level were high in seven aspects of CoRe but the one aspect of the understanding of learner's preconception. These differences were analyzed and the patterns shown by the science teachers in eight aspects of CoRe were drawn in this study. It was also found that the characteristics drawn in eight aspects of content representation shown by the teachers whose PCK level was medium were close to those whose PCK level was low rather than high in most aspects of CoRe.
Analysis of Students' and Teachers' Questions Posted on Chemistry Q&A Board in a Chemistry Education Homepage
Han, Jae-Young ; Ji, Youn-Jung ; Lee, Jae-Youn ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 137~143
DOI : 10.5012/jkcs.2012.56.1.137
This study analyzed the questions posted on the chemistry Q&A board by students and teachers in a chemistry education homepage, in order to understand the difficulties in learning and teaching chemistry. The different tendencies were found in the contents and the motivations of questions by students and teachers. In Chemistry I, students raised many questions in the 'Water' unit, while teachers raised many ones in the 'Chemical compound in our life' unit. In Chemistry II, students asked many questions in the 'Gas, liquid, solid' unit, while teachers did in 'Chemical reaction and energy' unit. Students' motivations of questioning were 'Explanation of unclear concept', and 'Problem solving', while teachers' motivations were 'Searching information', and 'Question in experiment'. The Q&A board provided a field in exchanging informations needed in learning and teaching chemistry. Educational implications were discussed on the use of Q&A board in chemistry education.
The Teachers' and Students' Perceptions on Lectures and Experiments of Law of Definite Proportion in Middle School Science Classes
Han, Gam-Bong ; Min, Hee-Jung ; Paik, Seoung-Hey ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 144~158
DOI : 10.5012/jkcs.2012.56.1.144
In this study, science teachers' and students' perceptions were searched on lectures and experiment of law of definite proportion in middle school science classes. For this study, the three teachers' lessons were observed and recorded, following interviews related to teachers' perceptions on the lessons and experiments. Also, We analyzed students' science scores, cognitive levels, science attitude, experimental reports, etc. According to the results, the three teachers had different focuses in the lectures. Chemistry teachers accentuated calculation of proportions and application rather than basic conceptions. But the students could not understand basic conceptions properly. The teachers spend long time to explain experimental procedures by assuming a low performance level of students in experimental classes. And the teachers had negative perceptions about error of results. The students could not understand the experiment results well, tried to manipulate data artificially, and had negative perceptions about error of results like the teachers. We suggested that these problems might be solved by changing teachers' perceptions on school science lectures and experiments.
Fabrication of Nano-Grain SnO
-ZnO Composite Electrodes and Their Photovoltaic Properties for Dye-Sensitized Solar Sell
Lee, Jung-Hoon ; Moon, Soo-Yeon ; Shin, Yu-Ju ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 159~163
DOI : 10.5012/jkcs.2012.56.1.159
Micellar Catalysis on 1,10-Phenanthroline Promoted Chromic Acid Oxidation of Propanol in Aqueous Media
Ghosh, Sumanta K. ; Saha, Rumpa ; Mukherjee, Kakali ; Ghosh, Aniruddha ; Bhattacharyya, Subhendu Sekhar ; Saha, Bidyut ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 164~168
DOI : 10.5012/jkcs.2012.56.1.164
Study on Changes in the Physical Properties of Hydrogel Lens Depending on Ethylene Glycol Dimathacrylate
Kim, Dong-Hyun ; Kim, Tae-Hun ; Sung, A-Young ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 169~174
DOI : 10.5012/jkcs.2012.56.1.169
Chemoselectivity and Regioselectivity in Palladium Catalyzed Aromatic Cyanation of 1-Bromo-4-fluorobenzene and 4-Chlorobenzaldehyde
Shim, Young-Ji ; Lee, Ho-Jin ; Kim, Hun-Choul ; Park, Soon-Heum ;
Journal of the Korean Chemical Society, volume 56, issue 1, 2012, Pages 175~179
DOI : 10.5012/jkcs.2012.56.1.175