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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Bulletin of the Korean Chemical Society
Journal Basic Information
Journal DOI :
Korean Chemical Society
Editor in Chief :
Byeong Moon Kim
Volume & Issues
Volume 28, Issue 12 - Dec 2007
Volume 28, Issue 11 - Nov 2007
Volume 28, Issue 10 - Oct 2007
Volume 28, Issue 9 - Sep 2007
Volume 28, Issue 8 - Aug 2007
Volume 28, Issue 7 - Jul 2007
Volume 28, Issue 6 - Jun 2007
Volume 28, Issue 5 - May 2007
Volume 28, Issue 4 - Apr 2007
Volume 28, Issue 3 - Mar 2007
Volume 28, Issue 2 - Feb 2007
Volume 28, Issue 1 - Jan 2007
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Two Functional Domains of Human Heat Shock Factor 1 Have Different Effects on Its DNA-binding Activity through Redox Changes
Lu, Ming ; Kim, Hee-Eun ; Li, Chun-Ri ; Hwang, Yun-Jeong ; Kim, Sol ; Kwak, Im-Jung ; Lee, Yun-Ju ; Kim, So-Sun ; Kang, Shin-Won ; Park, Nam-Gyu ; Kim, Dong-Kyoo ; Kang, Ho-Sung ; Park, Jang-Su ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1455~1456
DOI : 10.5012/bkcs.2007.28.9.1455
Fabrication of Diameter-tunable Well-aligned ZnO Nanorod Arrays via a Sonochemical Route
Jung, Seung-Ho ; Oh, Eu-Gene ; Lee, Kun-Hong ; Jeong, Soo-Hwan ; Yang, Yo-Sep ; Park, Chan-Gyung ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1457~1462
DOI : 10.5012/bkcs.2007.28.9.1457
A simple and facile sonochemical route was described for the fabrication of diameter-controlled ZnO nanorod arrays on Si wafers. The diameter of ZnO nanorods was controlled by the concentration of zinc cations and hydroxyl anions in aqueous precursor solution. At high concentration of the precursor solution, thick ZnO nanorod arrays were formed. On the contrary, thin ZnO nanorod arrays were formed at low concentration of the precursor solution. The average diameter of ZnO nanorods varies from 40 to 200 nm. ZnO nanorod arrays with sharp tip were also fabricated by the step-by-step decrease in precursor solution concentration. The crystal structure and optical characteristics of ZnO nanorods were investigated by transmission electron microscopy, X-ray diffraction, and photoluminescence spectroscopy. Growth mechanism of ZnO nanorod arrays was also proposed.
Synthesis of ZrTiO
Films by Composition-Combinatorial Approach through Surface Sol-Gel Method and Their Dielectric Properties
Kim, Chy-Hyung ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1463~1466
DOI : 10.5012/bkcs.2007.28.9.1463
Single phases of multi-component oxides films, ZrTiO4 and Ta2Zr6O17, could be synthesized by using the combinatorial approach through surface sol-gel route, coating the appropriate mole ratio of 100 mM zirconium butoxide, tantalum butoxide and titanium butoxide precursors on Pt/Ti/SiO2/Si (100) substrate, following pyrolysis at 450 oC, and annealing them at 770 oC. Both the films and bulks of ZrTiO4 and Ta2Zr6O17 showed very stable dielectric properties in temperature range, ?140 to 60 oC, and frequency range, 100 Hz to 1 MHz, promising their applications in wide range of temperatures and frequencies. The dielectric constants of the films were lower and a little more dependent on frequency than those of the bulks. The reduction of dielectric property in the film was mainly due to the interfacial effects that worked as series and parallel-connected capacitances toward the substantial film capacitance.
Single-Step Solid-State Synthesis of CeMgAl
Park, Byoung-Kyu ; Lee, Seoung-Soo ; Kang, Jun-Kun ; Byeon, Song-Ho ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1467~1471
DOI : 10.5012/bkcs.2007.28.9.1467
The green-emitting CeMgAl11O19:Tb (CMAT) phosphor has been prepared at 1200 °C by the simple solid-state reaction using AlF3 as a self-flux. This preparation temperature is much lower than those (1500-1700 °C) for conventional solid-state reaction and spray pyrolysis method. In particular, the complete process to produce high-quality phosphor particles was carried out through the single-step heat treatment of the mixture of corresponding oxide-type metal sources. An addition of AlF3 as a self-flux significantly decreased the crystallization temperature of CMAT with plate-like shape. The particle morphology could be controlled from plate-like to spherical by using H3BO3 as an additional flux. Thus, an optimal morphology and luminescence characteristics of CMAT were achieved when both AlF3 and H3BO3 fluxes were simultaneously used. Compared with conventional solid-state process, which is accompanied by the calcination step(s), and other alternative liquid solution techniques such as sol-gel method and spray pyrolysis, no use of active precursors and liquid media that are harmful to the environment is a distinctive advantage for the industrial purpose.
Artificial Neural Network Prediction of Normalized Polarity Parameter for Various Solvents with Diverse Chemical Structures
Habibi-Yangjeh, Aziz ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1472~1476
DOI : 10.5012/bkcs.2007.28.9.1472
Artificial neural networks (ANNs) are successfully developed for the modeling and prediction of normalized polarity parameter (ETN) of 216 various solvents with diverse chemical structures using a quantitative-structure property relationship. ANN with architecture 5-9-1 is generated using five molecular descriptors appearing in the multi-parameter linear regression (MLR) model. The most positive charge of a hydrogen atom (q+), total charge in molecule (qt), molecular volume of solvent (Vm), dipole moment (μ) and polarizability term (πI) are input descriptors and its output is ETN. It is found that properly selected and trained neural network with 192 solvents could fairly represent the dependence of normalized polarity parameter on molecular descriptors. For evaluation of the predictive power of the generated ANN, an optimized network is applied for prediction of the ETN values of 24 solvents in the prediction set, which are not used in the optimization procedure. Correlation coefficient (R) and root mean square error (RMSE) of 0.903 and 0.0887 for prediction set by MLR model should be compared with the values of 0.985 and 0.0375 by ANN model. These improvements are due to the fact that the ETN of solvents shows non-linear correlations with the molecular descriptors.
Prediction Partial Molar Heat Capacity at Infinite Dilution for Aqueous Solutions of Various Polar Aromatic Compounds over a Wide Range of Conditions Using Artificial Neural Networks
Habibi-Yangjeh, Aziz ; Esmailian, Mahdi ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1477~1484
DOI : 10.5012/bkcs.2007.28.9.1477
Artificial neural networks (ANNs), for a first time, were successfully developed for the prediction partial molar heat capacity of aqueous solutions at infinite dilution for various polar aromatic compounds over wide range of temperatures (303.55-623.20 K) and pressures (0.1-30.2 MPa). Two three-layered feed forward ANNs with back-propagation of error were generated using three (the heat capacity in T = 303.55 K and P = 0.1 MPa, temperature and pressure) and six parameters (four theoretical descriptors, temperature and pressure) as inputs and its output is partial molar heat capacity at infinite dilution. It was found that properly selected and trained neural networks could fairly represent dependence of the heat capacity on the molecular descriptors, temperature and pressure. Mean percentage deviations (MPD) for prediction set by the models are 4.755 and 4.642, respectively.
Photodissociation Dynamics of Cyanamide at 212 nm
Kwon, Chan-Ho ; Lee, Ji-Hye ; Kim, Hong-Lae ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1485~1488
DOI : 10.5012/bkcs.2007.28.9.1485
Photodissociation dynamics of cyanamide (NH2CN) at 212 nm has been investigated by measuring rotationally resolved laser induced fluorescence spectra of CN fragments exclusively produced in the ground electronic state. From the spectra, rotational population distributions of CN as well as translational energy releases in the products were obtained. The measured average rotational energies of CN were 12.4 ± 0.5 and 11.6 ± 0.5 kJ/ mol for v'' = 0 and v'' = 1, respectively and the center of mass average translational energy release among products was 41.8 ± 6.4 kJ/mol. The observed energy partitioning was well represented by statistical prior calculations, from which it was suggested that the dissociation takes place on the ground electronic surface after rapid internal conversion.
Bifurcation Phase Studies of Belousov-Zhabotinsky Reaction Containing Oxalic Acid and Acetone as a Mixed Organic Substrate in an Open System
Basavaraja, C. ; Huh, Do-Sung ; Park, Sung-Hyun ; Jeon, Un-Ji ; Pierson, R. ; Vishnuvardhan, T.K. ; Kulkarni, V.R. ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1489~1492
DOI : 10.5012/bkcs.2007.28.9.1489
Belousov-Zhabotinsky (BZ) reaction containing oxalic acid and acetone as a mixed organic substrate catalyzed by Ce(IV) in a flow system has been investigated. The reaction system is analyzed by varying flow rate, inflow concentrations, and temperature. Interchangeable oscillating patterns are observed in a certain range of concentrations, and above or below the condition a steady state is obtained. The increase in temperature increases the frequency and decreases the amplitude of oscillations. The apparent activation energy for the system is calculated by using the Arrhenius equation, which means that temperature has a greater effect on the reaction. Bifurcation phase diagrams for the system show the region of oscillations or steady states along with a small region of multistability. Further the behavioral trend observed in this system is discussed by mechanistic character of the system.
Synthesis and Characterization of Alkyl Methacrylate-based Microgels by Experimental Design Method
Lee, Young-Keun ; Jin, Fan-Long ; Park, Soo-Jin ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1493~1498
DOI : 10.5012/bkcs.2007.28.9.1493
In this work, alkyl methacrylate-based microgels were synthesized by an experimental design method, and their sebum absorption characteristics were investigated. The results of fractional factorial experimentation indicated that the cross-linking agent content, solvent content, and stirring speed were the main parameters in the synthesis of the microgels. The suitable synthesis conditions were determined by the response surface design method. Through a study of the monomer and solvent effects, it was confirmed that the microgel shows the highest sebum absorption ratio when t-butyl methacrylate is used as a monomer or when acetone is used as a solvent. The optimal microgel synthesis conditions for cosmetic application were determined, and the resulting microgel had a mean particle size of 4.7 μm and a sebum absorption ratio of 435%.
A Comprehensive Identification of Synaptic Vesicle Proteins in Rat Brains by cRPLC/MS-MS and 2DE/MALDI-TOF-MS
Lee, Won-Kyu ; Kim, Hye-Jung ; Min, Hye-Ki ; Kang, Un-Beom ; Lee, Cheol-Ju ; Lee, Sang-Won ; Kim, Ick-Young ; Lee, Seung-Taek ; Kwon, Oh-Seung ; Yu, Yeon-Gyu ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1499~1509
DOI : 10.5012/bkcs.2007.28.9.1499
Proteomic analyses of synaptic vesicle fraction from rat brain have been performed for the better understanding of vesicle regulation and signal transmission. Two different approaches were applied to identify proteins in synaptic vesicle fraction. First, the isolated synaptic vesicle proteins were treated with trypsin, and the resulting peptides were analyzed using a high-pressure capillary reversed phase liquid chromatography/tandem mass spectrometry (cRPLC/MS/MS). Alternatively, proteins were separated by two-dimensional gel electrophoresis (2DE) and identified by matrix-assisted laser desorption ionization mass spectrometry (MALDI-TOF/MS). Total 18 and 52 proteins were identified from cRPLC/MS-MS and 2DE-MALDI-TOF-MS analysis, respectively. Among them only 2 proteins were identified by both methods. Of the proteins identified, 70% were soluble proteins and 30% were membrane proteins. They were categorized by their functions in vesicle trafficking and biogenesis, energy metabolism, signal transduction, transport and unknown functions. Among them, 27 proteins were not previously reported as synaptic proteins. The cellular functions of unknown proteins were estimated from the analysis of domain structure, expression profile and predicted interaction partners.
Synthesis and HIV-1 Integrase Inhibitory Activities of 4-Hydroxy-5-azacoumarin 3-Carboxamides
Lee, Seung-Uk ; Park, Jang-Hyun ; Kwon, Tae-Hoon ; Yoo, Yeong-Jae ; Lee, Jae-Yeol ; Shin, Cha-Gyun ; Yoo, Kyung-Ho ; Lee, Yong-Sup ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1510~1514
DOI : 10.5012/bkcs.2007.28.9.1510
Recently, it has been reported that the inhibition of the strand transfer function of HIV-1 integrase is necessary to obtain significant antiviral activity. Accordingly, several compounds typified by aryl 1,3-diketo acids that can inhibit strand transfer reaction of HIV-1 IN have been identified. In this work, we synthesized new 4- hydroxy-5-azacoumarin-3-carbox(thio)amides (1a-h) and evaluated for the inhibition of HIV-1 IN strand transfer reaction with a brief SAR. Among synthesized, compound 1e was the most potent HIV-1 IN inhibitor with equipotent activity to that of L-708,906. Therefore, the 4-hydroxy-5-azacoumarin ring can be considered as a new scaffold in designing more potent of HIV-1 IN inhibitors for treatment of AIDS.
Facile Preparation of Copper(I) Halide-Dimethyl Sulfide Complex and Its Application
Park, Il-Hyun ; So, Myung-Sub ; Park, Koon-Ha ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1515~1518
DOI : 10.5012/bkcs.2007.28.9.1515
A preparative method of Me2SCuX (X = Cl, Br) via one-pot reaction was developed from common chemicals such as benzyl halide, DMSO, and Cu(0). In the reaction mixture small molecules such as methyl halide and dimethyl sulfide etc. were efficiently generated in situ, resulting in the formation of Me2SCuX. Oxidation of Cu(0) in reacting with both benzyl halide (starting material) and methyl halide (in situ generated product) to Cu(I) followed by complexing with dimethyl sulfide (in situ generated product) could explain the formation of Me2SCuX. In particular we found out that heterogeneous reaction of Me2SCuX and arenediazonium tetrafluoroborate in acetonitrile was so effective to afford corresponding bromoaromatics under mild conditions.
Triterpenoid Saponins from Elsholtzia bodinieri
Hu, Hao-Bin ; Zheng, Xu-Dong ; Hu, Huai-Sheng ; Jian, Yu-Feng ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1519~1522
DOI : 10.5012/bkcs.2007.28.9.1519
A new oleanane-type triterpenoid estersaponin, bodinierin C (1), along with two known saponins, mazusaponin I (2) and ciwujianoside C (3), were isolated from the water-soluble part of the root barks of Elsholtzia bodinieri. The structure of bodinierin C was characterized by spectroscopic means and chemical hydrolysis as 3β -Ocaffeoyl- 23-hydroxylechinocystic acid 28-O-α -L-rhamnopyranosyl-(1→4)-β-D-glucopyranosyl-(1→6)-β- D-glucopyranosyl ester. The known compounds were identified by comparing their spectral data with those of authentic samples or data reported in the literature. All compounds were firstly isolated from Elsholtzia bodinieri family.
Resolution of a Multi-Step Electron Transfer Reaction by Time Resolved Impedance Measurements: Sulfur Reduction in Nonaqueous Media
Park, Jin-Bum ; Chang, Byoung-Yong ; Yoo, Jung-Suk ; Hong, Sung-Young ; Park, Su-Moon ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1523~1530
DOI : 10.5012/bkcs.2007.28.9.1523
The first reduction peak of the cyclic voltammogram (CV) for sulfur reduction in dimethyl sulfoxide has been studied using time resolved Fourier transform electrochemical impedance spectroscopic (FTEIS) analysis of small potential step chronoamperometric currents. The FTEIS analysis results reveal that the impedance signals obtained during short potential steps can be resolved into electron transfer reactions of two different time constants in a high frequency region. The FTEIS method provides snap shots of impedance profiles during an earlier phase of the reaction, leading to time resolved EIS measurements. Our results obtained by the FTEIS analysis are consistent with a series of electron transfer and chemical equilibrium steps of a complex reaction, making up an ECE (electrochemical-chemical-electrochemical) mechanism postulated from the results of computer simulation.
Anion Receptors with 2-Imidazolidone Molecular Scaffold
Kim, Hyung-Il ; Kang, Jong-Min ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1531~1534
DOI : 10.5012/bkcs.2007.28.9.1531
Anion receptor based on 2-imidazolidone molecular scaffold has been synthesized. Anion binding studies carried out using 1H NMR and UV?vis spectroscopy revealed that this receptor 6 displays selectivity for the for the oxyanions such as acetate and dihydrogenphosphate ions and the affinity for the anions simply reflects the basicity of anions.
Transdermal Penetration of Synthetic Peptides and Their Penetration Enhancement Caused by Some Terpene Compounds
Ham, Seung-Wook ; Kang, Myung-Joo ; Park, Young-Mi ; Oh, Il-Young ; Kim, Bo-Gyun ; Im, Tae-Jong ; Kim, Sung-Hee ; Choi, Young-Wook ; Lee, Jae-Hwi ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1535~1538
DOI : 10.5012/bkcs.2007.28.9.1535
The work presented in this paper represents a study of the rate and extent of transdermal penetration of three synthetic hexapeptides consisting only of glycine (Gly) and phenylalanine (Phe) as the constituent amino acids and they include Phe-Gly-Gly-Gly-Gly-Gly (Pep-1), Phe-Phe-Gly-Gly-Gly-Gly (Pep-2), and Phe-Phe-Phe- Gly-Gly-Gly (Pep-3). The present study demonstrated the extent to which the peptides having a high metabolic stability were transdermally transported from the various vehicles. The results of this study appear to indicate that minor differences in the lipophilicity of the synthetic hexapeptides have a slight influence on the rate and extent of transport. In the presence of terpene permeation enhancers, together with ethanol (i.e., menthone/ EtOH, carveol/EtOH or cineole/EtOH), the peptides were more rapidly penetrated through the skin and among the terpenes tested, cineole was the most effective for all three peptides. The maximum enhancement ratio of approximately 2 was achieved by cineole in 50% ethanol solution.
Synthesis, Crystal Structure and Density Functional Calculations on 1-Phenyl-3-p-fluorophenyl-5-p-chlorophenyl-2-pyrazoline
Zhao, Pu Su ; Li, Yu Feng ; Guo, Huan Mei ; Jian, Fang Fang ; Wang, Xian ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1539~1544
DOI : 10.5012/bkcs.2007.28.9.1539
1-Phenyl-3-p-fluorophenyl-5-p-chlorophenyl-2-pyrazoline has been synthesized and characterized by elemental analysis, IR, UV-Vis and X-ray single crystal diffraction. Density functional calculations show that B3LYP/6-311G** method can reproduce the structural parameters. The electronic absorption spectra have been predicted based on the optimized structure by using 6-311G** and 6-311++G** basis sets and compared with the experimental values. The results indicate that TD-DFT method can only predict the electronic absorption spectra of the system studied here approximately. On the basis of vibrational analyses, the thermodynamic properties of the title compound at different temperatures have been calculated, revealing the correlations between ,C0p,m,S0m,H0m and temperature.
Efficient Construction of Quaternary Carbon: Stereocontrolled Synthesis of Novel Abacavir Analogue
Kim, Ai-Hong ; Hong, Joon-Hee ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1545~1548
DOI : 10.5012/bkcs.2007.28.9.1545
This paper discusses the racemic and stereoselective synthetic route for novel 4'α -methyl and 6'α -methyl analogues of abacavir. The quaternary carbon at the 4'-position of carbocyclic nucleoside was installed successfully via a Claisen rearrangement. The stereocontrolled construction of a methyl group in the 6'α - position was directed through the Felkin-Anh rule. A Bis-vinyl compound 9 was cyclized successfully using Grubbs' catalyst II to provide a carbocycle nucleus for the target compound. The synthesized compound 15 showed moderate anti-HIV activity (EC50 = 10.67 μM, MT-4 cell lines).
Ubiquitin Fusion System for Recombinant Peptide Expression and Purification: Application to the Cytoplasmic Domain of Syndecan-4
Chae, Young-Kee ; Lee, Ha-Yan ; Lee, Weon-Tae ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1549~1552
DOI : 10.5012/bkcs.2007.28.9.1549
The cytoplasmic domain of syndecan-4, a type I transmembrane heparan sulfate proteoglycan, was overexpressed as a fused form with the ubiquitin molecule in Escherichia coli, and the fusion protein was purified using immobilized metal affinity chromatography (IMAC). The cytoplasmic domain was released from its fusion partner by using yeast ubiquitin hydrolase (YUH), and subsequently purified by reverse phase chromatography. The integrity of the resulting peptide fragment was checked by MALDI-TOF and NMR spectroscopy. The yield of the peptide was 3.0-1.5 mg per liter in LB or minimal medium, respectively. The recombinant expression and purification of this domain will enable us its structural and functional studies using multidimensional NMR spectroscopy.
Synthesis of Chiral Intermediates Catalyzed by New Chiral Polymeric (Salen) Cobalt Complexes Bearing Lewis Acidic Metal Halides
Lee, Kwang-Yeon ; Kawthekar, Rahul B. ; Kim, Geon-Joong ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1553~1561
DOI : 10.5012/bkcs.2007.28.9.1553
The new type of heterometallic chiral polymer salen complexes have been synthesized and it has been found that group 13 metal salts (AlCl3, GaCl3 and InCl3) combined to cobalt salen unit played the crucial role in the asymmetric kinetic resolution of racemic epoxides. Polymeric salen catalysts showed very high reactivity and enantioselectivity for the asymmetric ring opening of terminal epoxide with diverse nucleophiles. They provide the enantiopure useful chiral intermediates such as chiral terminal epoxides and α -aryloxy alcohols in one-step process. An efficient methodology for providing very high enantioselectivity can be achieved in the synthesis of valuable chiral building blocks via our catalytic system by combination of various asymmetric ring opening reactions.
Synthesis and Physicochemical Properties of Ionic Liquids: 1-Alkenyl-2,3-dimethylimidazolium Tetrafluoroborates
Min, Gwan-Hong ; Yim, Tae-Eun ; Lee, Hyun-Yeong ; Kim, Hyo-Jin ; Mun, Jun-Young ; Kim, Sang-Mi ; Oh, Seung-M. ; Kim, Young-Gyu ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1562~1566
DOI : 10.5012/bkcs.2007.28.9.1562
1-Alkenyl-2,3-dimethylimidazolium tetrafluoroborate ionic liquids having an olefinic substituent were synthesized and characterized. Among them, [AMMIm]BF4 with an allyl group showed lower viscosity, higher ionic conductivity, and a wider electrochemical window compared with its analogue having a saturated alkyl substituent. An EDLC with [AMMIm]BF4 showed better performance than that with [PMMIm]BF4, too.
Synthesis and Properties of Pyrrolidinium and Piperidinium Bis(trifluoromethanesulfonyl)imide Ionic Liquids with Allyl Substituents
Yim, Tae-Eun ; Lee, Hyun-Yeong ; Kim, Hyo-Jin ; Mun, Jun-Young ; Kim, Sang-Mi ; Oh, Seung-M. ; Kim, Young-Gyu ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1567~1572
DOI : 10.5012/bkcs.2007.28.9.1567
New pyrrolidinium and piperidinium bis(trifluoromethanesulfonyl)imide (TFSI) ionic liquids (ILs) having allyl substituents were synthesized and characterized. All of them are liquid at room temperature and stable up to 300 oC. The pyrrolidinium-based ILs showed better conductivities and lower viscosities than the corresponding piperidinium-based ILs. Among them, 1-allyl-1-methylpyrrolidinium TFSI showed the lowest viscosity of 52 cP, the highest conductivity of 5.7 mS cm?1, and the most negative cathodic voltage window of ?3.2 V (vs. Fc/Fc+) on a platinum electrode, which are the improved results compared to the corresponding analogue having a saturated substituent, 1-methyl-1-propylpyrrolidinium TFSI.
Fluorescence Quenching of Norfloxacin by Divalent Transition Metal Cations
Park, Hyoung-Ryun ; Seo, Jung-Ja ; Shin, Sung-Chul ; Lee, Hyeong-Su ; Bark, Ki-Min ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1573~1578
DOI : 10.5012/bkcs.2007.28.9.1573
Fluorescence quenching of norfloxacin (NOR) by Cu2+, Ni2+, Co2+ and Mn2+ was studied in water. The change in the fluorescence intensity and lifetime was measured as a function of quencher concentration at various temperatures. According to the Stern-Volmer plots, the NOR was quenched both by collisions and complex formation with the same quencher. However, the static quenching had a more important effect on the emission. Large static and dynamic quenching constants support significant ion-dipole and orbital-orbital interactions between NOR and cations. The both quenching constants by Cu2+ were the largest among quenchers. Also, quenching mechanism of Cu2+ was somewhat different. The change in the absorption spectra due to the quencher provided information on static quenching. The fluorescence of NOR was relatively insensitive to both the dynamic and static quenching compared with other quinolone antibiotics. This property can be explained by the twisted intramolecular charge transfer.
An Efficient and Concise Synthesis of Biologically Interesting Natural Flemichapparin A, Flemingin A, Flemingin D, and Their Non-natural Analogues
Lee, Yong-Rok ; Xia, Likai ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1579~1584
DOI : 10.5012/bkcs.2007.28.9.1579
The efficient and concise synthesis of natural and non-natural pyranochalcones was achieved from readily available 2,4,5-trihydroxyacetophenone. The key steps in the synthetic strategy were ethylenediamine diacetate-catalyzed benzopyran formation and aldol reactions.
Synthesis and Metal Binding Properties of Anthraquinone Bridged with Coumarin
Ryu, Byung-Ju ; Cho, Eun-Jin ; Nam, Kye-Chun ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1585~1587
DOI : 10.5012/bkcs.2007.28.9.1585
Characteristic of Organic Thin Film Depending on Carbon Content by Fourier Transform Infrared Spectra and X-ray Diffraction Pattern
Oh, Teresa ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1588~1590
DOI : 10.5012/bkcs.2007.28.9.1588
Effect of Initial Carbon Sources on the Performance of a Microbial Fuel Cell Containing Environmental Microorganism Micrococcus luteus
Choi, Young-Jin ; Jung, Eun-Kyoung ; Park, Hyun-Joo ; Jung, Seun-Ho ; Kim, Sung-Hyun ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1591~1594
DOI : 10.5012/bkcs.2007.28.9.1591
Isolation of a New Phlorotannin, Fucodiphlorethol G, from a Brown Alga Ecklonia cava
Ham, Young-Min ; Baik, Jong-Seok ; Hyun, Jin-Won ; Lee, Nam-Ho ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1595~1597
DOI : 10.5012/bkcs.2007.28.9.1595
Synthesis and Peptide-binding Properties of C
Song, Eun-Ho ; Lee, Seung-Kyu ; Yoon, Seung-Soo ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1598~1600
DOI : 10.5012/bkcs.2007.28.9.1598
Synthesis of Obovatol Derivatives and Their Preliminary Evaluation as Antitumor Agents
Lee, Mi-Sung ; Yang, Jung-Eun ; Choi, Eun-Hwa ; In, Jin-Kyung ; Lee, So-Yong ; Lee, Hee-Soon ; Hong, Jin-Tae ; Lee, Hyo-Won ; Suh, Young-Ger ; Jung, Jae-Kyung ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1601~1604
DOI : 10.5012/bkcs.2007.28.9.1601
Facile Synthesis of 1,2,3,4-Tetrasubstituted Pyrroles from Baylis-Hillman Adducts
Kim, Seong-Jin ; Kim, Hoo-Sook ; Kim, Taek-Hyeon ; Kim, Jae-Nyoung ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1605~1608
DOI : 10.5012/bkcs.2007.28.9.1605
Computational Studies on the Sulfur Dioxide Absorption by Organic Lewis Bases
Shim, Jae-Goo ; Jhon, Young-H. ; Kim, Jun-Han ; Jang, Kyung-Ryong ; Kim, Ja-Heon ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1609~1612
DOI : 10.5012/bkcs.2007.28.9.1609
CD14 Acts as an Angiogenic Factor by Inducing Basic Fibroblast Growth Factor (bFGF)
Song, Mi-Na ; Cho, Sa-Yeon ;
Bulletin of the Korean Chemical Society, volume 28, issue 9, 2007, Pages 1613~1614
DOI : 10.5012/bkcs.2007.28.9.1613