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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 58, Issue 6 - Dec 2014
Volume 58, Issue 5 - Oct 2014
Volume 58, Issue 4 - Aug 2014
Volume 58, Issue 3 - Jun 2014
Volume 58, Issue 2 - Apr 2014
Volume 58, Issue 1 - Feb 2014
Selecting the target year
Growth Kinetics and Electronic Properties of Passive Film of Nickel in Borate Buffer Solution
Kim, Younkyoo ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 9~16
DOI : 10.5012/jkcs.2014.58.1.9
In a borate buffer solution, the growth kinetics and the electronic properties of passive film on nickel were investigated, using the potentiodynamic method, chronoamperometry, and single- or multi-frequency electrochemical impedance spectroscopy. The oxide film formed during the passivation process of nickel has showed the electronic properties of p-type semiconductor, which follow from the Mott-Schottky equation. It was found out that the passive film (
) of Ni formed in the low electrode potential changes to NiO and NiO(OH) while the electrode potential increases.
Spectral and Mechanistic Investigation of Oxidative Decarboxylation of Phenylsulfinylacetic Acid by Cr(VI)
Subramaniam, Perumal ; Selvi, Natesan Thamil ; Devi, Soundarapandian Sugirtha ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 17~24
DOI : 10.5012/jkcs.2014.58.1.17
The oxidative decarboxylation of phenylsulfinylacetic acid (PSAA) by Cr(VI) in 20% acetonitrile -80% water (v/v) medium follows overall second order kinetics, first order each with respect to [PSAA] and [Cr(VI)] at constant [
] and ionic strength. The reaction is acid catalysed, the order with respect to [
] is unity and the active oxidizing species is found to be
. The reaction mechanism involves the rate determining nucleophilic attack of sulfur atom of PSAA on chromium of
forming a sulfonium ion intermediate. The intermediate then undergoes
-cleavage leading to the liberation of
. The product of the reaction is found to be methyl phenyl sulfone. The operation of substituent effect shows that PSAA containing electron-releasing groups in the meta- and para-positions accelerate the reaction rate while electron withdrawing groups retard the rate. An excellent correlation is found to exist between log
constants with a negative value of reaction constant. The
value decreases with increase in temperature evidencing the high reactivity and low selectivity in the case of substituted PSAAs.
Aqueous Extract of Coriander Seeds as Green Corrosion Inhibitor for 304 Stainless Steel in Hydrochloric Acid Solutions
Fouda, Abd El-Aziz. S. ; Rashwan, Salah M. ; Abo-Mosallam, Hytham A. ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 25~32
DOI : 10.5012/jkcs.2014.58.1.25
Corrosion inhibition of 304 stainless steel (SS) in 1 M HCl by aqueous extract of coriander seeds was studied using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Values of inhibition efficiency obtained are dependent upon the concentration of extract and temperature. Generally, inhibition was found to increase with inhibitor concentration, but decrease with temperature. Physical adsorption mechanism has been proposed for the inhibition with Langmuir adsorption isotherm obeyed. Values of activation energy of the inhibited corrosion reaction of 304 SS are greater than the value obtained for the blank. Thermodynamic consideration reveals that adsorption of aqueous extract of coriander seeds 304 SS surface is spontaneous.
Synthesis and in Vitro Antimicrobial Evaluation of Benzothiazole Incorporated Thiazolidin-4-ones Derivatives
Agarwal, Shikha ; Agarwal, Dinesh Kumar ; Gautam, Naveen ; Agarwal, Kshamta ; Gautam, Dinesh Chandra ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 33~38
DOI : 10.5012/jkcs.2014.58.1.33
In the course of work on new pharmacologically active antimicrobial agents, we have reported the synthesis of a new class of structurally novel derivatives, incorporating two bioactive structures, a benzothiazole and thiazolidin-4-one, to yield a class of compounds having interesting antimicrobial properties. The antimicrobial properties of the synthesized compounds were investigated against bacteria (Staphylococcus aureus and Escherchia coli) and fungi (Candida albicans and Aspergillus niger) using serial plate dilution method. The structure of the synthesized compounds have been established by elemental analysis and spectroscopic data.
A Direct Transformation of Aryl Aldehydes to Benzyl Iodides Via Reductive Iodination
Ruso, Jayaraman Sembian ; Rajendiran, Nagappan ; Kumaran, Rajendran Senthil ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 39~43
DOI : 10.5012/jkcs.2014.58.1.39
A facile transformation of aryl aldehydes to benzyl iodides through one-pot reductive iodination is reported. This protocol displays remarkable functional group tolerance and the title compound was obtained in good to excellent yield.
Synthesis of 1,2,3,4-Tetrahydroquinolines Using AlCl
in Aqua Mediated
Behbahani, Farahnaz K. ; Ziaei, Parisa ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 44~48
DOI : 10.5012/jkcs.2014.58.1.44
Catalytic performance of Lewis acids have been investigated in the synthesis of 1,2,3,4-tetrahydroquinolines via cyclocondensation reaction of aniline derivatives with cyclic enol ethers such as 3,4-dihydro-2H-pyran and 2,3-dihydrofuran. The catalytic activity of various of these catalysts in different solvents was compared with other classical catalysts such as KSF clay (1.5 g),
(3 mol%), PANI-
(5 mol%), 4-npa (25 mol%) and Cellulose-
Synthesis of Novel Pyrazolines of Medicinal Interest
Gol, Ravindra M. ; Khokhani, Kamlesh M. ; Khatri, Taslimahemad T. ; Bhatt, Jyotindra J. ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 49~56
DOI : 10.5012/jkcs.2014.58.1.49
Different pyrazoline derivatives (6a-h and 7a-h) were synthesized by cyclization of substituted chalcones with hydrazine hydrate in acidic as well as basic conditions. Both the reactions were performed under conventional heating and microwave irradiation and percentage yields were compared. All the reactions were accelerated in acidic and basic conditions under microwave irradiation, with higher yields. All the synthesized compounds were characterized by their spectral study (IR, MS,
NMR) and were tested for their antibacterial and antifungal activity. The compounds 6g and 7g exhibited significant activity against S. aureu, 7g against E. faecalis, 6b and 7b against E. coli and 6b, 6c, 7b, 7c against S. typhi. The compounds 6d and 7d exhibited significant activity against C. albicans and 6c against M. luteus. Rest of the synthesized compounds showed moderate to poor activity against tested species with compared to standard.
Synthesis and Biological Activities of Novel Arylazopyrazolones Substituted with Thiazolyhydrazone
Shah, Purvesh J. ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 57~61
DOI : 10.5012/jkcs.2014.58.1.57
The 4-(1H)-benzotriazoyl methyl amino benzoate 3 was prepared by Mannich reaction of benzotriazole 1, ethyl-paminobenzoate 2 and formaldehyde. The prepared compound 3 then react with hydrazine hydrate results in the 4-(1H)-benzotriazoyl methyl amino benzoyl hydrazide 4. This compound on condensation with pre-prepared different ethyl 2-(2-(4-(4-substituted phenyl)thiazol-2-yl)hydrazono)-3-oxobutanoates 6a-d, furnished 1-(4-((1H-benzo[d] [1,2,3] triazol-1-yl)methyl amino) benzoyl)-4-(2-(4-(4-substituted phenyl)thiazol-2-yl) hydrazono)-3-methyl-1H-pyrazol-5(4H)-one 7a-d. All the compounds 7a-d was characterized by spectral studies. The compounds showed significant antimicrobial activity against various bacteria and fungi.
Synthesis and Biological Activity of (2-Substituted-4-methylthiazol-5-yl) (4-substituted piperazin-1-yl)methanone Derivatives
Mhaske, Pravin C. ; Shelke, Shivaji H. ; Raundal, Hemant N. ; Jadhav, Rahul P. ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 62~67
DOI : 10.5012/jkcs.2014.58.1.62
In the present study a novel series of (2-substituted-4-methylthiazol-5-yl)(4-substituted piperazin-1-yl)methanone derivatives were synthesized by reaction of 2-substituted-4-methylthiazole-5-carboxylic acid with N-substituted benzyl piperazine by using 1-ethyl-3-[3-(dimethylamino)propyl]carbodiimide hydrochloride (EDCl) and 1-hydroxybenzotriazole (HOBt) in DMF. All the newly synthesized compounds were characterized by spectral methods. The title compounds were screened for in vitro antibacterial activity. Most of the compounds show moderate to good antimicrobial activity.
Treatment of Oily Wastewater with WPO and CWO
Han, Mei ; Chen, Yihui ; He, Fang ; Yu, Li ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 68~71
DOI : 10.5012/jkcs.2014.58.1.68
Petroleum refining unavoidably generates large volumes of oily wastewater. The environmentally acceptable disposal of oily wastewater is a current challenge to the petroleum industry. Nowadays, more attentions have been focused on the treatment techniques of oily wastewater. Oily wastewater contained highly concentrated and toxic organic compounds. Wet peroxide oxidation (WPO) and catalytic wet oxidation (CWO) were applied to eliminate pollutants to examine the feasibility of the WPO/CWO of oily wastewater. The results indicated that more than 80% chemical oxygen demand (COD) removal from oily wastewater was achieved with CWO. Homogenous catalyst,
and NaOH showed effective removal for pollutants in oily wastewater. Greater than 90% COD removal was achieved with WPO. It was concluded that WPO was a far more effective process for oily wastewater.
Regioselective Nitration of Inactive 4,4-Dibromobiphenyl with Nitrogen Dioxide and Molecular Oxygen over Zeolites: An Efficient Preparation of 4,4'-Dibromo-2-nitrobiphenyl
Wang, Wei ; Peng, Xinhua ; Chen, Nan ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 72~75
DOI : 10.5012/jkcs.2014.58.1.72
In the presence of zeolites, 4,4'-dibromobiphenyl could be region-selectively nitrated by the action of nitrogen dioxide and molecular oxygen. The ratio of 4,4'-dibromo-2-nitrobiphenyl to 4,4'-dibromo-3-nitrobiphenyl could reach 14 in a high yield of 90%. Zeolites could be easily regenerated by heating and reused four times to give the results similar to those obtained with fresh catalyst. Compared with the classic nitration method, no nitric acid and sulfuric acid were used, which suggested that the method was an environmentally economic process.
Petroleum Refinery Effluents Treatment by Advanced Oxidation Process with Methanol
Shoucheng, Wen ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 76~79
DOI : 10.5012/jkcs.2014.58.1.76
Petroleum refinery effluents are waste originating from industries primarily engaged in refining crude oil. It is a very complex compound of various oily wastes, water, heavy metals and so on. Conventional processes are unable to effectively remove the chemical oxygen demand (COD) of petroleum refinery effluents. Supercritical water oxidation (SCWO) was proposed to treat petroleum refinery effluents. In this paper, methanol was used to investigate co-oxidative effect of methanol on petroleum refinery effluents treatment. The results indicated that supercritical water oxidation is an effective process for petroleum refinery effluents treatment. Adding methanol caused an increase in COD removal. When reaction temperature is
, residence time is 20 min, OE is 0.5 and initial COD is 40000 mg/L, and COD removal increases 8.5%.
Optimizing Oily Wastewater Treatment Via Wet Peroxide Oxidation Using Response Surface Methodology
Shi, Jianzhong ; Wang, Xiuqing ; Wang, Xiaoyin ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 80~84
DOI : 10.5012/jkcs.2014.58.1.80
The process of petroleum involves in a large amount of oily wastewater that contains high levels of chemical oxygen demand (COD) and toxic compounds. So they must be treated before their discharge into the receptor medium. In this paper, wet peroxide oxidation (WPO) was adopted to treat the oily wastewater. Central composite design, an experimental design for response surface methodology (RSM), was used to create a set of 31 experimental runs needed for optimizing of the operating conditions. Quadratic regression models with estimated coefficients were developed to describe the COD removals. The experimental results show that WPO could effectively reduce COD by 96.8% at the optimum conditions of temperature
excess (HE) 0.8, the initial concentration of oily wastewater 3855 mg/L and reaction time 9 min. RSM could be effectively adopted to optimize the operating multifactors in complex WPO process.
Inhibiting Effect of Nicotinic Acid Hydrazide on Corrosion of Aluminum and Mild Steel in Acidic Medium
Bhat, J. Ishwara ; Alva, Vijaya D.P. ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 85~91
DOI : 10.5012/jkcs.2014.58.1.85
The corrosion behavior of aluminum and mild steel in hydrochloric acid medium was studied using a nicotinic acid hydrazide as inhibitor by potentiodynamic polarization, electrochemical impedance spectroscopy technique and gravimetric methods. The effects of inhibitor concentration and temperature were investigated. The experimental results suggested, nicotinic acid hydrazide is a good corrosion inhibitor for both aluminum and mild steel in hydrochloric acid medium and the inhibition efficiency increased with increase in the inhibitor concentration. The polarization studies revealed that nicotinic acid hydrazide exhibits mixed type of inhibition. The inhibition was assumed to occur via adsorption of the inhibitor molecules on the aluminum and mild steel surface and inhibits corrosion by blocking the reaction sites on the surface of aluminum.
Stimuli-Sensitive Poly(NIPA-co-APA) Hydrogels for the Controlled Release of Keterolac Tromethamine
Kim, Yonghyun ; Babu, V. Ramesh ; Rao, K.S.V. Krishna ; Lim, Jae-Min ; Thangadurai, T. Daniel ; Lee, Yong-Ill ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 92~99
DOI : 10.5012/jkcs.2014.58.1.92
The pH sensitive hydrogels composed of N-isopropylacrylamide (NIPA) and acryloyl phenylalanine (APA) were prepared by redox polymerization using N,N'-methylenebisacrylamide (MBA) as a crosslinker. Anti-inflammatory and analgesic agent, Keterolac Tromethamine (KT), was loaded successfully into poly(NIPA-co-APA) copolymeric hydrogels by swelling equilibrium method. To understand the nature of drug in the polymeric matrix, the newly synthesized drug loaded poly(NIPA-co-APA) copolymeric hydrogels were characterized by using differential scanning calorimetry (DSC) and X-ray diffraction (XRD) techniques. The scanning electron microscopy (SEM) technique result indicates the spherical smooth surface of the hydrogels. The drug (KT) releasing nature of the poly(NIPA-co-APA) hydrogels was studied in pH 1.2 and 7.4. Effects of drug loading, crosslinking agent, pH and the ionic strength of the external medium on swelling of hydrogels were also investigated.
Synthesis and Characterization of Superparamagnetic Fe
Kulkarni, Sachnin A. ; Sawadh, P.S. ; Palei, Prakash K. ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 100~104
DOI : 10.5012/jkcs.2014.58.1.100
Magnetite nanoparticles were prepared by co-precipitation method and then silica was coated onto the surface of
by hydrolysis of TEOS. The silica coated magnetite nanoparticles were characterized for its structural, microstructural, optical, vibrational and magnetic properties by X-ray diffraction analysis, Scanning electron microscopy, UV-visible spectroscopy, Infrared spectroscopy and Vibration sample magnetometer, respectively. XRD study confirmed the presence of
on the surface of magnetite nanoparticles. SEM study indicated that with increase in TEOS content the particles become bigger and mono-disperse. It was also found that the silica coating prevents magnetic particles from aggregation and imparts excellent stability.
A Case Study on the Influence of Science Education Courses on Pre-service Chemistry Teachers' View of Learning
Koh, Eun-Jung ; Choi, Byung-Soon ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 105~117
DOI : 10.5012/jkcs.2014.58.1.105
The purpose of this study was to analyze pre-service chemistry teachers' view of learning focused on the influence of science education courses that pre-service chemistry teachers had learned. Three pre-service chemistry teachers were selected for this study. Documents related to science education courses, survey data about their view of learning and interview data were collected, transcribed and analyzed. According to this study, pre-service chemistry teachers had changed, modified, maintained and strengthened their view of learning while they took the science education courses. Pre-service teacher K and P had changed their traditional view to the constructive view and then had modified their view by adding the reality. And pre-service teacher H had modified his constructive view with some traditional view. All Pre-service teachers had modified their own view of learning because of the science education course that emphasized the real field situation. As discussed above, science education courses focused on the applying the theory to real teaching situation gave the opportunity to modify pre-service teachers' own view of learning. It implied that the science education courses learned in the teachers college have to include contents based on real teaching situation and pre-service teachers' reflective thinking processes for establishing their view of learning and customized teaching activities.
The Formation Process of Nature-Study in U.S. and Its Implication for Science Education
Park, Jongseok ; Park, Sangmin ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 118~125
DOI : 10.5012/jkcs.2014.58.1.118
This study purposes to historical approach the formation process of Nature-Study, and to re-evaluate its definition and direction at present. The idea of Nature-Study originated from Campanella, Ratke and Comenius, who emphasized real things. The idea developed through Object Lessons of Sheldon, the Natural History of Agassiz, and Progressivism of Parker. They acted as the main contributors who evolved the idea of Nature-Study and its core fields that involve: 'studying with real things' in Object Lessons which brought the methodical aspects to the idea, 'studying with nature' from Natural History that enhanced the content characteristics and 'learner-centered education' from Progressivism, which impacted the philosophical aspects. Straight (a fellow student of Agassiz) was a teacher for Sheldon Oswego normal school and Parker's Cook County normal school, who synthesized the fields together and paved the way for the formation of Nature-Study. Jackman of Cook Country normal school established Nature-Study as a school curriculum and Bailey and Comstock of Cornell University formed the American Nature-Study Society and as a result, Nature-Study started to gain popularity. However, many educators increasingly rejected Nature-Study as a unifying topic, and preferred the use of textbooks rather than firsthand experiences. This hindered the nature-study movement and it declined since the 1920s. But today, the Nature-study idea can play a huge role in developing science education, inclusive education centered nature, self-initiated retrieval, sympathy with nature and character building of students.
Analysis and Identification of Students' Threshold Concepts in High School Chemistry
Park, Eun Jung ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 126~129
DOI : 10.5012/jkcs.2014.58.1.126
Concerning the difficulty of learning science and reduced interest in science, the authors of this study searched for potential threshold concepts which are portals or gateways in the field of science (particularly chemistry). The nature of these concepts and how to overcome their troublesomeness were further questioned. For this study, 239 high school students completed chemistry II provided information about what difficult concepts and potential threshold concepts in high school chemistry are and how they affect learning chemistry. In particular, the mastery experience of the threshold concepts was explored in detail. Two, "mole and atomic structure" were selected as threshold concepts in chemistry. Not only as important but also as threshold, this study emphasized the importance of the two concepts in terms of features characterizing them as threshold concepts. In particular, the features objectify subjective experiences of students and provide information describing the scientific meaning and distinctive nature of threshold concepts in science. Along with the data from teachers, this study shows the integrative feature as key criteria for students to make meaningful understanding of the two threshold concepts.
Functionalization of 4,5-Dichloropyridazin-3(2H)-one
Sung, Gi Hyeon ; Kim, Bo Ram ; Ryu, Ki Eun ; Yoon, Yong-Jin ;
Journal of the Korean Chemical Society, volume 58, issue 1, 2014, Pages 140~144
DOI : 10.5012/jkcs.2014.58.1.140