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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 19, Issue 12 - Dec 1998
Volume 19, Issue 11 - Nov 1998
Volume 19, Issue 10 - Oct 1998
Volume 19, Issue 9 - Sep 1998
Volume 19, Issue 8 - Aug 1998
Volume 19, Issue 7 - Jul 1998
Volume 19, Issue 6 - Jun 1998
Volume 19, Issue 5 - May 1998
Volume 19, Issue 4 - Apr 1998
Volume 19, Issue 3 - Mar 1998
Volume 19, Issue 2 - Feb 1998
Volume 19, Issue 1 - Jan 1998
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A High-Valent Iron(IV) Oxo Porphyrin Cation Radical Complex in Olefin Epoxidation Reactions
이윤정 ; 김철 ; 김영아 ; 한소엽 ; 남원우 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1019~1019
A High-Valent Iron(IV) Oxo Porphyrin Cation Radical Complex in Olefin Epoxidation Reactions
이윤정 ; 김철 ; 김영아 ; 한소엽 ; 남원우 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1021~1023
Crystal Structure of the Pentanuclear Complex Containing
Units Linked by
김영미 ; 윤경태 ; 전무진 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1023~1024
Accurate Normal Modes Calculations of Protein Molecule by an Iterative Approach
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1025~1027
Synthesis and Biological Evaluation of C-2 Modified Taxol Analogs
김석찬 ; 문만식 ; 최관민 ; 전숙진 ; 김현경 ; 정대일 ; 이기승 ; 채기병 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1027~1028
Theoretical Study on Tetrahedral Intermediate Formation by Class A
-Lactamase: the Effects of the Oxyanion Hole and Substrate Specificity
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1029~1031
Preferential Intercalation of Organic Anions into Layered Double Hydroxide
국원권 ; 허영국 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1032~1036
Intercalation compounds of organic anions into layered double hydroxides (LDH) are synthesized by the coprecipitation route. X-ray diffraction data reveal that the intercalated terephthalate (TP), naphthalene-2,6-disulfonate (NA26), and anthraquinone-2,6-disulfonate (AQ26) are arranged with their molecular planes perpendicular to the hydroxide layer. HPLC data show that 26.2% of TP and 73.8% of AQ26 are cointercalated, whereas NA26 is not intercalated into the Zn/Al-LDH. These results indicate the possibility of a molecular recognition ability of Zn/Al-LDH. The molecular recognition ability of intercalation into Zn/Al-LDH is in the order AQ26 > TP >> NA26.
Studies on Solvent Extraction and Flotation Technique Using Metal-Dithizone Complexes(II). Determination of Trace Elements in Water Samples by Solvent Sublation
김영상 ; 최윤석 ; 최희선 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1036~1042
The preconcentration and determination of trace elements in water samples were studied by a solvent sublation utilizing dithizonate complexation. After metal dithizonates were formed, trace amounts of cadmium, cobalt, copper and lead were floated and extracted into small volume of a water-immiscible organic solvent on the surface of sample solution and determined in the solvent directly by GF-AAS. Several experimental conditions as formation condition of metal-dithizonate complexes, pH of solution, amount of dithizone, stirring time, the type and amount of surfactants, N2 bubbling rate and so on were optimized for the complete formation and effective flotation of the complexes. And also four kinds of light solvents were compared each other to extract the floated complexes, effectively. After the pH was adjusted to 4.0 with 5 M HNO3, 8.0 mL of 0.05% acetone solution of dithizone was added to 1.00 L water sample. The dithizonate complexes were flotated and extracted into the upper methyl isobutylketone (MIBK) layer by the addition of 2.0 mL 0.2% ethanolic sodium lauryl sulfate solution and with the aid of small nitrogen gas bubbles. And this solvent sublation method was applied to the analysis of real water samples and good results of more than 85% recoveries were obtained in spiked samples.
Laser-Induced Fluorescence Spectroscopy of the
Transition of Dimethyldiazirine
김택수 ; 김상규 ; Choi, Young S. ; 곽일환 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1042~1047
The fluorescence excitation (FE) spectrum of the S1-S0 (1B2-1A1) transition of dimethyldiazirine cooled in supersonic jet expansions has been obtained. Dispersed fluorescence (DF) spectra have also been taken for some prominent features of the FE spectrum. Vibrational analyses of the FE and DF spectra with the help of an ab initio molecular orbital calculation lead to some new vibrational assignments and refined fundamental frequencies.
Molecular Dynamics Simulation for Bilayers of Alkyl Thiol Molecules at Solid-Solid Interfaces
이송희 ; 김한수 ; 박형숙 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1047~1054
We present the results of molecular dynamics simulations for three different systems of bilayers of long-chain alkyl thiol [S(CH2)15CH3] molecules on an solid-solid interface using the extended collapsed atom model for the chain-molecule. It is found that there exist two possible transitions: a continuous transition characterized by a change in molecular interaction between sites of different chain molecules with increasing area per molecule and a sudden transition from an ordered lattice-like state to a liquid-like state due to the lack of interactions between sites of chain molecules on different surfaces with increasing distance between two solid surfaces. The third system displays a smooth change in probability distribution characterized by the increment of gauche structure in the near-tail part of the chain with increasing area per molecule. The analyses of energetic results and chain conformation results demonstrate the characteristic change of chain structure of each system.
Fluorescence and Laser Light Scattering Studies of Modified Poly(ethylene-co-methylacrylate0 Ionomers on the Formation of Stable Colloidal Nanoparticles in Aqueous Solution
여상인 ; 우규환 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1054~1059
Fluorescence and dynamic light scattering measurements were applied to the study of formation and structure of aggregated colloidal particles in modified poly(ethylene-co-methylacrylate) ionomers in aqueous solution. Both 8-anillino-l-naphthalene-sulfonic acid (ANS) and pyrene were used as fluorescence probe to obtain the information on the structure of particle surface and inside, respectively. Three different ionomers used in this study started to aggregate at very dilute concentration, 3-8 x 10-6 g/mL. In this study, we demonstrate that the polyethylene ionomers can form stable nanoparticles. The hydrophobic core made of the polyethylene backbone chains is stabilized by the ionic groups on the particle surface. Such a formed stable nanoparticles have a relatively narrow size distribution with an average radius in the range of 27-48 nm, depending on the kind of ionic groups. Once the stable particles are formed, the particle size distributions were nearly constant. This study shows another way to prepare surfactant-free polyethylene nanoparticles.
Synthesis of 10-Oxo-
Rho, Young S. ; Kim, Sun Y. ; 조인호 ; 강흠수 ; 유동진 ; 정채준 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1059~1063
Regiospecific total syntheses of (±)-11-deoxy-4-methoxy-10-oxo-βrhodomycinone (21a) and (±)-11-deoxy-1-methoxy-10-oxo-β-rbodomycinone (21b) are described. 2-(2-Bromoethyl)-1,3-dioxane (6) was transformed to naphthalenone 12, which was condensed with (phenylsulfonyl)-isobenzofuranone 13 to afford 7,8-dihydro-9-ethyl-6-hydroxy-4-methoxynaphthacen-5,12-dione (15). Epoxide 16 prepared from olefinic compound 15, reacted with HF/Pyr (7:3) to give 17. Dihydroxylation of 17 with t-BuOK/P(OMe)3/O2, selective cis-diol protection of mixed compounds 18 with phenylboronic acid in toluene, separation of cis-boronate 19 and trans-diol 20 by column chromatography on silica gel, and cleavage of the boronate group of 19 with 2-methylpentane-2,4-diol in acetic acid completed the construction of 21.
Rapid Energy Transfer Mechanism of F Electronic Excitation to the Vibration of Randomly Distributed
장두전 ; 아철승 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1063~1068
The nature of F electronic excitation energy transfer to OH- vibrational levels in KCl crystals is the exchange interaction, although the transfer process exhibits three temporally distinguishable components depending on the distance between excited F center and OH-. The critical distance as well as rate of the major energy transfer process in randomly distributed samples increases rapidly as OH- librational motions become active with temperature rise. The excited state character introduced into the OH- ground electronic state by perturbation is essential for the exchange interaction. The perturbation is brought about by the expanded electron cloud of excited F center for OH- associated to F center, whereas by librations and lattice vibrations perpendicular to the bond axis for isolated OH- . F excitation quenching efficiency by OH- is dependent on the variation of the critical distance rather than the rate as the rate is much faster than the normal F bleach recovery rate.
Molecular Dynamics Simulation Study on Segmental Motion in Liquid Normal Butane
이송희 ; 김한수 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1068~1072
We present results of molecular dynamic (MD) simulations for the segmental motion of liquid n-butane as the base case for a consistent study for conformational transition from one rotational isomeric state to another in long chains of liquid n-alkanes. The behavior of the hazard plots for n-butane obtained from our MD simulations are compared with that for n-butane of Brownian dynamics study. The MD results for the conformational transition of n-butane by a Poisson process form the total first passage times are different from those from the separate t-g and g-t first passage times. This poor agreement is probably due to the failure of the detailed balance between the fractions of trans and gauche. The enhancement of the transitions t-g and g-t at short time regions are also discussed.
A Functional Representation of the Potential Energy Surface of Non-Identical
Reaction: F- …
김정섭 ; 김영훈 ; 노경태 ; 이종명 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1073~1079
The potential energy surface (PES) of the non-identical SN2 reactions, F- + CH3Cl → FCH3 + Cl and (H2O)F + CH3Cl → FCH3 + Cl-(H2O), were investigated with ab initio MO calculations. The ab initio minimum energy reaction path (MERP) of the F- + CH3Cl → FCH3 + Cl- was obtained and it was expressed with an intermediate variable t. The ab initio PES was obtained near around t. Analytical potential energy function (PEF) was determined as a function of the t in order to reproduce the ab initio PES. Based on Morse-type potential energy function, a Varying Repulsive Cores Model (VRCM) was proposed for the description of the bond forming and the bond breaking which occur simultaneously during the SN2 reaction. The MERP calculated with the PEF is well agreed with the ab initio MERP and PEF could reproduce the ab initio PES well. The potential parameters for the interactions between the gas phase molecules in the reactions and water were also obtained. ST2 type model was used for the water.
Efficient One-Step Synthesis of 2-Arylfurans by Ceric Ammonium Nitrate (CAN)-Mediated Cycloaddition of 1,3-Dicarbonyl Compounds to Alkynes
이용록 ; 변명환 ; 김병소 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1080~1083
An efficient method for construction of 2-arylfiirans has been developed by ceric(IV) ammonium nitratemediated oxidative cycloaddition of cyclic and acyclic 1,3-dicarbonyl compounds to several alkynes. Reactions of 1,3-cyclohexanedione, 1,3-cyclopentanedione, and 2,4-pentanedione with several alkynes furnish 2-arylfurans in 26-75% yields. Extension of this technology to more complex 4-hydroxy-2-quinolone and 3-hydroxy-lH-phenalen-l-one with phenylacetylene also affords furoquinolinone and ftirophenalenone derivative in moderate yields. Reaction of 4-hydroxycoumarins with phenylacetylene give linear and angular furocoumarin derivatives as a mixture of regioisomer in good yields. The mechanistic pathway for the formation of 2-arylfurans has been also described.
The Comparative Study in the Oxygen Atom Transfer Reaction by Ruthenium Mono-Oxo Complexes
Seok, Won K. ; Son, Yung J. ; Moon, Sung W. ; Lee, Heung N. ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1084~1090
The oxidation of triphenylphosphine by [(tpy)(phen)RuⅣ(O)]2+ and [(bpy)(p-tert-butylpy)RuⅣ(0)]2+ (tpy is 2,2': 6',2"-terpyridine, phen is 1,10-phenanthroline, bpy is 2,2'-bipyridine, and p-tert-butylpy is para-tertbutylpyridine) in CH3CN has been studied. Experiments using 18O-labeled complex show the oxyl group transfer from [RuⅣ=O]2+ to triphenylphosphine occured quantitatively within experimental error. Kinetic data were fit to a second-order for [RuⅣ=O]2+ and [PPh3]. The initial product, [RuⅡ-OPPh3]2+, was formed as an observable intermediate and then underwent slow solvolysis. The reaction proceeded as endothermic in activation enthalpy and a decrease in activation entropy. The oxidative reactivity of four representative ruthenium mono-oxo oxidants against triphenylphosphine was compared. These systems have been utilized as electrochemical oxidative catalysts.
Acid-Catalyzed Benzidine Rearrangement of Unsymmetrical Hydrazoaromatics
박군하 ; 박문규 ; 조윤환 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1090~1094
Acid-catalyzed benzidine rearrangements of new unsymmetrical diazanes 1-3, prepared from the reduction of corresponding diazenes 4-6, were carried out in ethanolic solutions. The results are as follows; rearrangement of (3-carbomethoxyphenyl)(3-methoxyphenyl)diazane 1 gave 4,4'-diamino-2-carbomethoxy-2'-methoxybiphenyl 12 (p-benzidine type) in 71% and 10-amino-3-methoxyphenanthridin-6(5H)-one 13, 8-amino-3-methoxyphenanthridin-6(5H)-one 14 in 7.1% and 3.4%, respectively. Product 13 and 14 were formed by the condensation reaction of primarily formed o-benzidine and diphenyline type product, respectively. (5-Carbomethoxy-2-chlorophenyl)(4-methoxyphenyl)diazane 2 and (5-carbomethoxy-2-methylphenyl)(4-methoxyphenyl)diazane 3 underwent mainly disproportionations to give fission amines and corresponding diazenes in about 53% and 40% yields, respectively. The results obtained from the rearrangements of diazanes 1-3 indirectly indicated the importance of disproportionations to understand the benzidine rearrangements. The structures of benzidine rearrangement products were determined by usual NMR techniques such as DEPT, 2D H-H COSY, H-C COSY, 2D NOESY, and Gaussian function multiplication.
Crystal Structure of an Acetylene Sorption Complex of Dehydrated Fully Mn(II)-Exchanged Zeolite X
배명남 ; 김양 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1095~1099
The crystal structure of an acetylene sorption complex of dehydrated fully Mn(Ⅱ)-exchanged zeolite X, Mn46Si100Al92O384·30C2H2 (a=24.705(3) Å) has been determined by single-crystal X-ray diffraction techniques. The structure was solved and refined in the cubic space group Fd3 at 21(l) ℃. The complex was prepared by dehydration at 380 ℃ and 2 x 10-6 Torr for 2 days, followed by exposure to 300 Torr of acetylene gas for 2 h at 24 ℃. The structure was refined to the final error indices, R1=0.060 and R2=0.054 with 383 reflections for which I > 3σ(Ⅰ). In the structure, Mn2+ ions are located at two different crystallographic sites; sixteen Mn2+ ions at site I are located at the centers of the double six rings and thirty Mn2+ ions are found at site Ⅱ in the supercage, respectively. Each of these latter Mn2+ ions is recessed ca. 0.385(2) Å into the supercage from its three-oxygen plane. Thirty acetylene molecules are sorbed per unit cell. Each Mn2+ ion at site Ⅱ lies on a threefold axis in the supercage of the unit cell, close to three equivalent trigonally arranged zeolite framework oxygen atoms (Mn(Ⅱ)-O=2.135(9) Å) and symmetrically to both carbon atoms of a C2H2 molecules. At these latter distances, the Mn(Ⅱ)-C interactions are weak (Mn(Ⅱ)-C=2.70(5) Å), probably resulting from electrostatic attractions between the divalent cations and the polarizable π-electron density of the acetylene molecules.
Synthesis of (Diamine)platinum(II) and (Diamine)platinum(IV) Complexes of Isopropylidenmalonate Ligand and Their Interaction with Guanosine-
이은주 ; 전무진 ; 손윤수 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1099~1105
A series of (diamine)isopropylidenmalonatoplatinum(Ⅱ) complexes and the oxidation products, (diamine)Pt (OOC)2C=C(CH3)2(X)2, (diamine=ethylenediamine(en), 1,2-diaminopropan(dap), N-methylethylenediamine(men); X=OH, OCOCH3, OCOCF3), have been prepared, and their interaction with guanosine-5'-monophosphate (5'-GMP) have been examined by means of 1H NMR spectroscopy. The present platinum(Ⅱ) complexes have shown to interact with 5'-GMP through N7 coordination in two concecutive steps in a similar way as with cisplatin, but no interaction between the present platinum(Ⅳ) complexes and 5'-GMP was observed. However, in the presence of ascorbic acid, the platinum(Ⅳ) complexes have been found to interact with 5'-GMP with the reaction rate depending on their reduction rate.
Liquid Chromatographic Resolution of Racemic
-Amino Acid Derivatives on an Improved
-Acidic Chiral Stationary Phase Derived from (S)-Leucine
현명호 ; 이승준 ; 류재정 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1105~1109
A chiral stationary phase derived from (S)-N-(3,5-dinitrobenzoyl)leucine N-phenyl N-alkyl amide (CSP 2) was applied in separating the two enantiomers of various π-basic aromatic derivatives of leucine N-propyl amide in order to evaluate π-basic aromatic groups as an effective derivatizing group for the resolution of a-amino acids. Subsequently N-(3,5-dimethoxybenzoyl) group was found to be very effective as a π-basic aromatic derivatizing group. Based on these results, N-(3,5-dimethoxybenzoyl) derivatives of various a-amino N-propyl amides, N,N-diethyl amides and esters were resolved on the CSP derived from (S)-N-(3,5-dinitrobenzoyl) leucine N-phenyl N-alkyl amide (CSP 2) and the resolution results were compared with those on the CSP derived from (S)-N-(3,5-dinitrobenzoyl)leucine N-alkyl amide (CSP 1). The enantioselectivities exerted by CSP 2 were much greater than those exerted by CSP 1. In addition, racemic N-(3,5-dimethoxybenzoyl)-a-mino N,Ndiethyl amides were resolved much better than the corresponding N-(3,5-dimethoxybenzoyl)-a-mino N-propyl amides and esters on both CSPs. Based on these results, a chiral recognition mechanism utilizing the π-π donor-acceptor interaction and the two hydrogen bondings between the CSP and the analyte was proposed.
Anchimeric Assistance in the Rearrangement of Dichloro-3-methyl-1,4-oxathianes to 2-Chloromethy1 Dihydro-1,4-oxathiins
한호규 ; 최중권 ; 남기달 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1109~1112
An anchimeric assistance of anilide in the rearrangement of dichloro-1,4-oxathaines 1 to 2-chloromethyl dihydro-1,4-oxathiins 2 is described. The inductive effect of the carbonyl group of anilide was negligible in the rearrangement. A rate of the rearrangement depended on the basicity of anilide nitrogen. A hydrogen bonding between the anilide hydrogen and an oxygen atom of those substituents make the nitrogen less basic, resulting in the slower rearrangement.
A New Porous Carbon via an Exfoliation of n-Octylammonium Tetrachloroferrate(III)-Graphite Intercalation Complex
권채원 ; 김동훈 ; 최진호 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1113~1116
A new graphite intercalation compound (GIC), n-octylammonium tetrachlorofeffate(Ⅲ)-graphite, has been derived from well-known ferric chloride graphite intercalation compound. X-ray diffration study shows that the basal spacing of this new GIC is 20.8 Å. In order to investigate the local geometry around the iron atom in the graphite layers, X-ray absorption spectroscopy experiments were performed. The first discharge capacity of its exfoliated form is found to be 862 mAh/g, which is more than double the value of pristine graphite (384 mAh/g). Such a drastic increase implies that the exfoliated graphite is a promising electrode material.
An Efficient Synthesis of 3-Substituted Quinazolones
정용준 ; 정영식 ; 성철민 ; 박노상 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1117~1119
A Peptide-Binding Receptor with the Extended Binding Site
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1119~1121
Influence of Wax on Migration of Antiozonants in NR Vulcanizates
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1121~1124
Synthesis of Oxomolybdenum(V) Complexes with Trifunctional ONO-Donor Ligands
장윤정 ; 모성종 ; 고본권 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1124~1127
Pyrolysis of 1,2-Diethyltetrachlorodisilane
곽영우 ; 이경구 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1127~1130
Comparison of Mass Spectral Fragmentation Patterns of Isomeric N-Substitued-2-methoxycarbonyl-9-azabicyclo[4.2.1]- and [3.3.1]nonane Skeletons
함원훈 ; 오창영 ; 김기수 ; 김경래 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1131~1133
Synthesis and Anion Binding Properties of Urea Derivatized p-tert-Butylcalixarenes
남계춘 ; 김대순 ; 양용식 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1133~1136
Effect of Thiophosphatidate on in vitro Protein Phosphorylation
강병호 ; 최명운 ;
Bulletin of the Korean Chemical Society, volume 19, issue 10, 1998, Pages 1137~1140