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Bulletin of the Korean Chemical Society 34건

  1. [국내논문]   Oxovanadium(IV) Complexes Containing VO(ONS) Basic Core: Synthesis, Structure, and Spectroscopic Properties   피인용횟수: 3

    Jang, Yoon-Jung (Department of Chemistry, Catholic University of Daegu ) , Lee, Uk (Department of Chemistry, Pukyong National University ) , Koo, Bon-Kweon (Department of Chemistry, Catholic University of Daegu)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 72 - 76 , 2005 , 0253-2964 ,

    초록

    Some mononuclear oxovanadium(IV) complexes having the general formula [VOL(bidentate)] (1-4) of which L is tridentate ONS-donor salicylaldehyde S-methyldithiocarbazate (sal-mdtc $^{2-}$ ) or salicylaldehyde 4- phenylthiosemicarbazate (sal-phtsc $^{2-}$ ) and bidentate stands for 2,2'-bipyridyl (bpy) or 1,10-phenanthroline (phen) have been synthesized. The complexes were characterized by elemental analyses, FAB mass, UV, IR spectroscopy, and cyclic voltammetry. Two of the complexes [VO(sal-mdtc)(bpy)] (1) and [VO(sal-mdtc) (phen)] (2) were crystallographically characterized. The structures revealed that vanadium atom is octahedrally coordinated by the O, N, and S donor atoms of the tridentate ligand, the two N atoms of bidentate ligand, and the oxo atom. The oxygen donor, occupying an apical position has a trans-labilizing effect, resulting in elongation of the V-N bond. The cyclic voltammograms of the complexes exhibited one cathodic response in the range ?d1.45 $\sim$ ?f1.52 V due to the reduction of V(IV) to V(III).

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  2. [국내논문]   Heterocyclic Nonlinear Optical Chromophores Composed of Phenothiazine or Carbazole Donor and 2-Cyanomethylene-3-cyano-4,5,5-trimethyl-2,5-dihydrofuran Acceptor   피인용횟수: 12

    Cho, Min-Ju (College of Environment & Applied Chemistry, Institute of Natural Sciences, Kyung Hee University ) , Kim, Ja-Youn (College of Environment & Applied Chemistry, Institute of Natural Sciences, Kyung Hee University ) , Kim, Jae-Hong (College of Environment & Applied Chemistry, Institute of Natural Sciences, Kyung Hee University ) , Lee, Seung-Hwan (College of Environment & Applied Chemistry, Institute of Natural Sciences, Kyung Hee University ) , Dalton, Larry R. (Department of Chemistry, University of Washington ) , Choi, Dong-Hoon (College of Environment & Applied Chemistry, Institute of Natural Sciences, Kyung Hee University)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 77 - 84 , 2005 , 0253-2964 ,

    초록

    We prepared the new nonlinear optical chromophores that show fairly high microscopic nonlinearity through intramolecular charge transfer. Phenothiazine and carbazole units played an important role to contribute high electron donability and connect the resonance pathway via conjugative effect in the cyclized ring beside the aromatic ring. Theoretical calculation, electrochemical analysis, and absorption spectroscopic study gave us useful information about the energy states and microscopic nonlinearities of two serial chromophores. We compared the microscopic nonlinearities of four chromophores with the conjugation length and electron donability in the push-pull type NLO chromophores. The effect of gradient donability and lengthening the conjugation were investigated on the electronic state and microscopic nonlinearity.

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  3. [국내논문]   Hologram Quantitative Structure Activity Relationship (HQSAR) Study of Mutagen X   피인용횟수: 2

    Cho, Seung-Joo (Life Science Division, Korea Institute of Science and Technology)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 85 - 90 , 2005 , 0253-2964 ,

    초록

    MX and its analogs are synthesized and modeled by quantitative structure activity relationship (QSAR) study including comparative molecular field analysis (CoMFA). As a result, factors affecting this class of compounds have been found to be steric and electrostatic effects. Because hologram quantitative structure activity relationship (HQSAR) technique is based on the 2-dimensional descriptors, this is free of ambiguity of conformational selection and molecular alignment. In this study we tried to include all the data available from the literature, and modeled with the HQSAR technique. Among the parameters affecting fragmentation, connectivity was the most important one for the whole compounds, giving good statistics. Considering additional parameters such as bond specification only slightly improved the model. Therefore connectivity has been found to be the most appropriate to explain the mutagenicity for this class of compounds.

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  4. [국내논문]   Synthesis of O-(3-[18F]Fluoropropyl)-L-tyrosine (L-[18F]FPT) and Its Biological Evaluation in 9L Tumor Bearing Rat   피인용횟수: 3

    Moon, Byung-Seok (Laboratory of Cyclotron Application, Korea Institute of Radiological and Medical Sciences ) , Kim, Sang-Wook (Laboratory of Cyclotron Application, Korea Institute of Radiological and Medical Sciences ) , Lee, Tae-Sup (Laboratory of Cyclotron Application, Korea Institute of Radiological and Medical Sciences ) , Ahn, Soon-Hyuk (Laboratory of Cyclotron Application, Korea Institute of Radiological and Medical Sciences ) , Lee, Kyo-Chul (Laboratory of Cyclotron Application, Korea Institute of Radiological and Medical Sciences ) , An, Gwang-Il (Laboratory of Cyclotron Application, Korea Institute of Radiological and Medical Sciences ) , Yang, Seung-Dae (Laboratory of Cyclotron Application, Korea Institute of Radiological and Medical Sciences ) , Chi, Dae-Yoon (Department of Chemistry, Inha University ) , Choi, Chang-Woon (Department of Nuclear Medicine, Korea Institute of Radiological and Medical Sciences ) , Lim, Sang-Moo (Department of Nuclear Medicine, Korea Institute of Radiological and Medical Sciences ) , Chun, Kwon-Soo (Laboratory of Cyclotron Application, Korea Institute of Radiological and Medical Sciences)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 91 - 96 , 2005 , 0253-2964 ,

    초록

    O-(3-[ $^{18}$ F]Fluoropropyl)-L-tyrosine (L-[ $^{18}$ F]FPT) was synthesized by nucleophilic radiofluorination followed by acidic hydrolysis of protective groups and evaluated with 9 L tumor bearing rat. L-[ $^{18}$ F]FPT is an homologue of O-(2-[ $^{18}$ F]fluoroethyl)-L-tyrosine (L-[ $^{18}$ F]FET) which recently is studied as a tracer for tumor imaging using positron emission tomography (PET). [ $^{18}$ F]FPT was directly prepared from the precursor of O-(3-ptoluenesulfonyloxypropyl)- N-(tert-butoxycarbonyl)-L-tyrosine methyl ester. FPT-PET image was obtained at 60 min in 9 L tumor bearing rats. The radiochemical yield of [ $^{18}$ F]FPT was 0-45% (decay corrected) and the radiochemical purity was more than 95% after HPLC purification. The total time elapsed for the synthesis of [ $^{18}$ F]FPT was 100 min from EOB (End-of-bombardment). A comparison of uptake studies between [ $^{18}$ F]FPT and [ $^{18}$ F]FET was performed. In biodistribution, [ $^{18}$ F]FPT showed similar pattern with [ $^{18}$ F]FET in various tissues, but [ $^{18}$ F]FPT showed low uptake in brain. Furthermore, [ $^{18}$ F]FPT showed higher tumor-to-brain ratio than [ $^{18}$ F]FET. In conclusion, [ $^{18}$ F]FPT seems to be more useful amino acid tracer than [ $^{18}$ F]FET for brain tumors imaging with PET.

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  5. [국내논문]   Addition of α,α-Difluoroiodomethyl Ketones to Alkenes with a Copper Catalyst   피인용횟수: 1

    Kwak, Kyung-Chell (Department of Bionanochemistry and Basic Sciences Research Institute, Wonkwang University ) , Lee, Woo-Yiel (Department of Bionanochemistry and Basic Sciences Research Institute, Wonkwang University ) , Zheshan, Quan (College of Pharmacy, Yanbian University ) , Lee, Young-Hang (Department of Bionanochemistry and Basic Sciences Research Institute, Wonkwang University ) , Yun, Young-Gab (Department of Prescription, School of Oriental Medicine, Wonkwang University ) , Kwak, Gyu-Beum (Department of New Material Science, Chonbuk Natinoal University ) , Chung, Hun-Taeg (Medicinal Resources Research Center of Wonkwang University ) , Kwon, Tae-Oh (College of Life Science and Natural Resources, Wonkwang University ) , Chai, Kyu-Yun (Department of Bionanochemistry and Basic Sciences Research Institute, Wonkwang University)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 97 - 102 , 2005 , 0253-2964 ,

    초록

    The addition reactions of $\alpha$ , $\alpha$ -difluoroiodomethyl n-butyl ketone, α,α-difluoroiodomethyl cyclohexyl ketone, or $\alpha$ , $\alpha$ -difluoroiodomethyl phenyl ketone to alkenes were successfully accomplished in good yields in the presence of copper powder. The reaction was also applicable to alkenes containing a variety of functional groups such as ester, trimethylsilyl, or ether group. Acetonitrile was determined to be the best solvent in the present study and the reaction was performed at 55 ${^{\circ}C}$ for 15-22 h. This reaction provides a new, efficient and general method for the synthesis of $\alpha$ , $\alpha$ -difluoro functionalized ketones.

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  6. [국내논문]   Catalytic Mechanism for Growth of Carbon Nanotubes under CO-H2 Gas Mixture  

    Chung, Uoo-Chang (Industrial Liaison Cluster, Pusan National University ) , Kim, Yong-Hwan (School of Material Science and Engineering, Pusan National University ) , Lee, Deok-Bo (Reliability Analysis Research Center, Hanyang University ) , Jeong, Yeon-Uk (Dept. of Inorganic Materials Engineering, Kyungpook National University ) , Chung, Won-Sub (School of Material Science and Engineering, Pusan National University ) , Cho, Young-Rae (School of Material Science and Engineering, Pusan National University ) , Park, Ik-Min (School of Material Science and Engineering, Pusan National University)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 103 - 106 , 2005 , 0253-2964 ,

    초록

    In order to investigate the catalytic mechanism for the growth of carbon nanotubes (CNTs), a comprehensive study was conducted using carbon materials synthesized at 680 ${^{\circ}C}$ with a gas mixture of CO-H $_2$ after reduction at 800 ${^{\circ}C}$ by H $_2$ gas from iron oxide, and metal Pt. The resulting material was observed by scanning electron microscopy (SEM) and X-ray diffraction patterns (XRD) after a variety of reaction times. The carbon materials synthesized by metal Pt were little affected by reaction time and the sintered particles did not form CNTs. Xray analysis revealed that metal Fe was completely converted to iron carbide (Fe $_3$ C) without Fe peaks in the early stage. After 5 min, iron carbide (Fe $_3$ C) and carbon (C) phases were observed at the beginning of CNTs growth. It was found that the intensity of the carbon(C) peak gradually increased with the continuous growth of CNTs as reaction time increases. It was also found that the catalyst of growth of CNTs was metal carbide.

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  7. [국내논문]   Spontaneous Vesicle Formation in Aqueous Mixtures of Cationic Gemini Surfactant and Sodium Lauryl Ether Sulfate   피인용횟수: 1

    Cheon, Ho-Young (Department of Industrial and Engineering Chemistry, Chungbuk National University ) , Jeong, Noh-Hee (Department of Industrial and Engineering Chemistry, Chungbuk National University ) , Kim, Hong-Un (Department of Applied Chemistry, Dongyang Technical College)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 107 - 114 , 2005 , 0253-2964 ,

    초록

    Molecular aggregates of surfactant molecules consisting of one or more bilayers arranged in a hollow, closed, usually spherical geometry are termed “esicles”or “iposomes” In recent years it has been found that in certain systems the vesicular structure forms spontaneously and is long lived, and it has been suggested that these structures may in fact constitute the equilibrium state in these cases (as is true of micelles) This paper deals with the mixed CMC, vesicles, phase behavior, phase transition, geometrical structure, their formation and characterization in the aqueous solutions of mixed cationic/anionic surfactants systems. TEM micrographs revealed that the vesicles were of spherical shape and that their size was of around 180 nm. The zeta potentials are positive at CGS1-rich regions and negative at SLES-rich regions. In the region where SLES/CGS1 (6/4), the zeta potentials are very small, implying that the vesicles at this surfactant ratio may be less stable. At other surfactant ratios, the vesicles are thought to be stable, supported by large absolute values of zeta potentials and little change in UV absorbance for several months.

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  8. [국내논문]   Determination of Water Content in Ethanol by Miniaturized Near-Infrared (NIR) System   피인용횟수: 3

    Cho, Soo-Hwa (Department of Chemistry, College of Natural Sciences, Hanyang University ) , Chung, Hoe-Il (Department of Chemistry, College of Natural Sciences, Hanyang University ) , Woo, Young-Ah (College of Pharmacy, Dongduk Women's University ) , Kim, Hyo-Jin (College of Pharmacy, Dongduk Women's University)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 115 - 118 , 2005 , 0253-2964 ,

    초록

    The miniaturized NIR (Near-infrared) spectrometer has been utilized for the determination of water content (1-19% range) in ethanol that is the most popular organic solvent in pharmaceutical industries. It has many potential capabilities that can replace the conventional analyzers especially for the on-line measurement since it is compact, versatile and cost-effective. By using two dimensional (2D) correlation spectroscopy, it was preliminarily investigated to find any unforeseen spectral distortion among the spectra collected from the miniaturized spectrometer. The 2D study revealed that the spectral variation clearly followed the variation of water concentration without any spectral distortion or abnormality. PLS (Partial Least Squares) was employed to build the calibration model and the resulting prediction performance was acceptable and stable over several days. Even though the miniaturized NIR system was evaluated to fairly simple chemical matrix, the overall study demonstrates the sufficient feasibility for diverse practical and industrial applications.

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  9. [국내논문]   Ab Initio Quantum Mechanical Investigation of H2(An+1X2n)H2(A=C or Si, X=O or S, n = 1-2)]; Energetics, Molecular Structures, and Vibrational Frequencies   피인용횟수: 3

    Choi, Kun-Sik (Department of Chemistry, HanNam University ) , Kim, Hong-Young (Department of Chemistry, HanNam University ) , Kim, Seung-Joon (Department of Chemistry, HanNam University)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 119 - 126 , 2005 , 0253-2964 ,

    초록

    The geometrical parameters, vibrational frequencies, and relative energies of H $_2$ (A $_{n+1}$ X $_{2n}$ )H $_2$ (A=C or Si, X=O or S, n = 1-2) oligomers have been investigated using high level ab initio quantum mechanical techniques with large basis sets. The equilibrium geometries have been optimized at the self-consistent field (SCF), the coupled cluster with single and double excitation (CCSD), and the CCSD with connected triple excitations [CCSD(T)] levels of theory. The highest level of theory employed in this study is cc-pVTZ CCSD(T). Harmonic vibrational frequencies and IR intensities are also determined at the SCF level of theory with various basis sets and confirm that all the optimized geometries are true minima. Also zero-point vibrational energies have been considered to predict the dimerization and the relative energies.

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  10. [국내논문]   Effect of Island Size on the Packing Density in the Early Stages of Alkylsilane-Based Monolayer Self Assembly  

    Lee, Bo-H. (Department of Chemsitry, Kookmin University ) , Sung, Myung-M. (Department of Chemsitry, Kookmin University)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 127 - 130 , 2005 , 0253-2964 ,

    초록

    The early stage of the self assembly for octadecyltrichlorosilane (OTS)-based monolayers is investigated using atomic force microscopy (AFM). Height measurements using AFM prove that the island height of the monolayers gradually increases with increasing the island size, and is close to the limiting value (h = $\sim$ 25 $\AA$ ) after d = $\sim$ 600 nm in size. Since the theoretical length of a covalently bound OTS molecule is 26.2 A, the limiting value of the island height means that the islands with d ${\geq}$ 600 nm consist of close-packed, fully extended chains. The heights for the islands with d

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