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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 17, Issue 12 - Dec 1996
Volume 17, Issue 11 - Nov 1996
Volume 17, Issue 10 - Oct 1996
Volume 17, Issue 9 - Sep 1996
Volume 17, Issue 8 - Aug 1996
Volume 17, Issue 7 - Jul 1996
Volume 17, Issue 6 - Jun 1996
Volume 17, Issue 5 - May 1996
Volume 17, Issue 4 - Apr 1996
Volume 17, Issue 3 - Mar 1996
Volume 17, Issue 2 - Feb 1996
Volume 17, Issue 1 - Jan 1996
Selecting the target year
Remarkably Stable Oxoiron(Ⅳ) Porphyrin Complexes
신구 ; 고원배 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 667~668
Nature of the Epoxidizing Intermediates in the Epoxidation of Olefins by Hydrogen Peroxide, tert-Butyl Hydroperoxide, m-Chloroperbenzoic Acid, and Iodosylbenzene Catalyzed by Iron(Ⅲ) Porphyrin Complex
이경아 ; 남원우 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 669~671
Implication of Secondary Structure of Bradykinin in Membrane Mimic Solution Investigated by NMR Spectroscopy
서정용 ; 최병석 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 671~673
(1S,2S)-(-)-1,2-Diphenylethylenediamine; A Good Chiral Solvating Agent for the Determination of Enantiomeric Purity of Chiral Alcohols by
유성은 ; 김석인 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 673~674
Syn-Selectivity in Titanium (Ⅳ) Mediated Aldol Condensation of the Silyl Ketene Acetal of S-2-Pyridyl Thioester with Aldehydes
서귀현 ; 추동준 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 674~676
Convenient One-Pot Synthesis of Polystyrene Copolymer Containing Thiocarbamate Gruop
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 678~679
Enhancement of Initiator Efficiency in Cationic Polymerization of Isobutyl Vinyl Ether
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 679~681
Investigation of Molecular Coupling Effects on Photothermal Properties of Polar Solutions by Thermal Lens
하정현 ; 임종태 ; 최중길 ; 김용록 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 682~685
Photothermal properties depend on the characteristics of energy transfer processes in solution. In this study, a time-resolved single beam thermal lens experiment in various solvents is employed to investigate the energy coupling effects which govern the energy transfer processes. Interestingly, it is observed that the behaviour of the photothermal propagation in solution depends on the property of solution and the concentration of solute in a single beam thermal lens configuration. These characteristics lead us to consider the solute-solvent coupling effects as well as the solvent-solvent interactions.
Nanophase Iron Clusters Produced by CO₂Laser Multiphoton-Decomposition of
: Their Generation and Characterization
Lee, G. H. ; Huh, S. H. ; Jung, H. I. ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 686~688
We have produced nanophase iron clusters inside a gas cell by decomposing iron pentacarbonyls from the mixture of ~20 Torr Fe(CO)5/~3 Torr SF6 with a pulsed CO2 laser. The product displayed a black tint. Its composition was identified to be mostly iron from an inductively coupled plasma (ICP) atomic emission spectrum. The X-ray diffraction (XRD) pattern indicates a body-centered cubic structure for the cluster. A transmission electron micrograph proves that their diameter ranges between 50 and 70 Å and their average diameter is 60 Å.
Synthesis and Characterization of Schiff Base-Cu(II) Complexes Derived from 2-Hydroxy-1-Naphthaldehyde and Aliphatic Diamines
정병구 ; 임채령 ; 채희남 ; 조기형 ; 남계춘 ; 최용국 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 688~693
Tetradentate Schiff base ligands derived from 2-hydroxy-1-naphthaldehyde and aliphatic diamine have been synthesized. Cu(Ⅱ) complexes of Schiff base ligands have been synthesized from the free ligands and copper acetate. The mole ratio of ligand to copper was identified to be 1:1 by the result of elemental analysis and Cu(Ⅱ) complexes were in a four-coordinated configuration. The electrochemical redox process of Cu(Ⅱ) complexes in a DMF solution has been investigated by cyclic voltammetry, chronoamperometry, differential pulse voltammetry, and controlled potential coulometry. The redox process of Cu(Ⅱ) complexes is one electron transfer process in quasi-reversible and diffusion-controlled reaction. The electrochemical redox potentials and the kinetic parameters of Cu(Ⅱ) complexes are affected by the chelate ring of Schiff base ligands.
Steric Effect on the Molecular Hyperpolarizabilities of β-Nitrostyrene Derivatives
조봉래 ; 제종태 ; 김현수 ; 전승준 ; 송옥근 ; Wang, C. H. ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 693~695
The steric effect on the first order hyperpolarizability of the β-nitrostyrene derivatives has been investigated by comparing the β values and the dihedral angles between the aryl and nitroalkenyl groups. In general the β value increased with the electron-donating ability of the substituent. The larger β value for 3,4-dimethoxy-β-nitrostyrene than that for p-methoxy-β-nitrostyrene has been attributed to the lower charge transfer energy for the former. The most striking substituent effect was observed in the β-methyl-β-nitrostyrene derivatives. Thus the β values for 3,4-dimethoxy- and p-methoxy derivatives of the latter decreased to near zero, probably because of the large distortion from planarity caused by the steric repulsion between the β-methyl and the aryl groups. The larger β value for p-dimethylamino-β-methyl-β-nitrostyrene has been interpreted with an increased electron-donating ability of the substituent and increased co-planarity.
NMR Studies of Silicate and Borosilicate Gel to Glass Conversion
양경화 ; 우애자 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 696~699
Silicate and borosilicate gels were prepared by the sol-gel process and thermally treated in the 150-850 ℃ temperature range. Solid-state 1H MAS and 29Si CP/MAS NMR spectroscopy were used to investigate the effects of heat treatments on the silicate gel to glass conversion process. The 1H NMR isotropic chemical shifts and the relative intensities of hydrogen bonded and isolated silanol groups have been used to access the information concerning the dehydration process on the silicate gel surface. The 29Si NMR isotropic chemical shifts affected by the local silicon environment have been used to determine the degree of crosslinking, i.e. the number of siloxane bonds. These NMR results suggest that the silicate gel to glass conversion process is occurred by two stages which are dependent on the temperature; (1) the formation of particles up to 450 ℃ and (2) the formation of large particles by aggregation of each separated single particle above 450 ℃. In addition, the effects of B atom on the formation of borosiloxane bonds in borosilicates have been discussed.
Molecular Dynamics Simulation for Monolayers of Alkyl Thiol Molecules at Air-Solid Interfaces
이송희 ; 김한수 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 700~706
We present the results of molecular dynamics simulations of monolayers of long-chain alkyl thiol [S(CH2)15CH3] molecules on an air-solid interface using the extended collapsed atom model for the chain-molecule and a gold surface for the solid surface. Several molecular dynamics simulations have been performed on monolayers with areas per molecule ranging from 18.30 to 32.10 Å2/molecule. It is found that there exist three possible transitions: a continuous transition characterized by a change in molecular configuration without change in lattice structure, a sudden transition characterized by the distinct lattice defects and perfect islands, and a third transition characterized by the appearance of a random, liquid-like state. The analysis of probability distributions of the segments shows that the structure of the chain-molecules at the air-solid interface is completely different from that at the air-water interface in the view of the degree of overlap of the probability distributions of the neighbor segments. The calculated diffusion coefficients of the chain-molecules on the monolayers seem to be not directly related to any one of the three transitions. However, the large diffusion of the molecules enhanced by the increment of the area per molecule may induce the second transition.
Polypyrrole Film Studied by Three-Parameter Ellipsometry
김동래 ; 이덕환 ; 백운기 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 707~712
Growth and changes of electronically conducting polypyrrole (PPy) in the form of thin films polymerized on metal electrodes were investigated by electrochemical and in situ three-parameter ellipsometry methods at the wavelength of 632.8 nm. Although the optical equations produced multiple sets of solution, it was possible to determine a unique set of thickness and the optical constants of a film by auxiliary measurements and/or physical reasoning. The changes in the thickness and the optical properties of the polymers during polymerization and electrochemical oxidation/reduction was successfully followed by the three-parameter ellipsometric technique. The optical properties of the polymers continuously changed as the film grew. The imaginary part of the refractive index of polypyrrole seemed to be dominantly determined by the existence of an absorption band around the visible range.
Kinetics and Mechanism for the Reactions of N-Methyl-N-phenylcarbamoyl Chlorides with Benzylamines in Acetonitrile
고한중 ; 이호찬 ; 이해황 ; 이익준 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 712~715
Kinetic studies are carried out on the reactions of N-methyl-N-phenylcarbamoyl chlorides with benzylamines in acetonitrile. The selectivity parameters, ρX (=-0.6~-0.8), ρY (=1.0-1.1), and ρXY (=-0.14), suggest that the reaction proceeds by an SN2 mechanism. Kinetic isotope effects, kH/kD, involving deuterated nucleophiles (XC6H4CH2ND2) are all inverse type (<1.0), and the trends of changes in the magnitude are consistent with those expected for the observed negative sign of ρXY(=∂ρX/∂σY = ∂ρY/∂σX < 0). The relatively low activation enthalpies also support the proposed mechanism.
Stability and Electrochemical Characteristics of Polyaniline Salt Films in 1 N HCl Solution
조정환 ; 오응주 ; 요철현 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 715~719
Thin films of polyaniline (PANI) salts were in situ deposited on a Pt plate during either chemical polymerization or electrochemical polymerization. The oxidation states of the salt films were controlled by the applied DC potential. AC impedance of the Pt/PANI electrode were measured in monomer-free 1 N HCl solution in order to investigate the electrodic properties of the films at the following applied DC potentials: 0, 0.45 and 0.75 V vs. SCE. Very small differences in film conductivity according to its oxidation state were observed by analysis of the impedance spectra, the reasons of which are complicated by enriched water content in the film and possible decrease in the film thickness during the measurements. The electrochemical activity of the film/solution interface varied with its oxidation state. Stability of the film in 1 N HCl solution was also evaluated by impedance and cyclic voltammetry measurements.
Catecholalane (1,3,2-Benzodioxaluminole) as a Selective Reducing Agent
차진순 ; 장석원 ; 이지은 ; 김종미 ; 권오운 ; 이형수 ; 송한철 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 720~724
Catecholalane (1,3,2-Benzodioxaluminole, CA) prepared from catechol and aluminum hydride in tetrahydrofuran (THF) is found to be a selective reducing agent. The systematic study in order to characterize the reducing properties of the reagent under practical conditions (THF, 0 or 25 ℃, the quantitative amount of reagent to compound) has been done. The reagent reduces aldehydes, ketones, esters and acid chlorides to the corresponding alcohols, and primary amides to the corresponding amines. Especially noteworthy is that the reagent can convert both aromatic and aliphatic nitriles to the corresponding aldehydes in very high yields.
Selective Reduction of Carbonyl Compounds with B-Alkoxydiisopinocampheylborane
차진순 ; 권오운 ; 김종미 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 725~729
Reaction of carbonyl compounds with B-alkoxydiisopinocampheylborane (Ipc2BOR, R=H, Et, i-Pr, t-Bu) was investigated in detail in order to establish their usefulness as selective reducing agents. The reagents were extremely mild and reduced only aldehydes effectively under mild conditions. The reagents also reduced α,β-unsaturated aldehydes to the corresponding allylic alcohols without any detectable 1,4-reduction. Furthermore, aldehydes can be reduced in the presence of epoxides and acid chlorides. Consequently, the selective reduction of aldehyde groups in the presence of keto and all other functional groups has been realized with these reagents.
Intercalation of Primary Diamines in the Layered Perovskite Oxides,
홍영식 ; 김시중 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 730~735
The layered perovskite oxide, KSr2Nb3O10, was synthesized. The interlayer potassium cations were readily exchanged by protons in hydrochloric acid solution to give the protonation compound, HSr2Nb3O10·0.5H2O. The intercalation compounds, [NH3(CH2)nNH3]xSr2Nb3O10, were also obtained by acid-base reactions between the protonation compound and organic bases, 1,n-alkyldiamines. The interlayer distances in the intercalation compounds were linearly increased with the increase of the number of carbon (Δc/Δn=1.05 Å) in 1,n-alkyldiamines. The intercalated alkyldiammonium ions formed a paraffin-like monolayer with average tilting angle (θ) of ca. 56°. The intercalation reactions occurred stoichiometrically. The thermal decomposition process of the intercalation compounds showed distinct three steps due to the desorption of hydrated water, the decomposition of organic moiety, and the decomposition of Sr-related compounds.
Molecular Dynamics Simulation of Liquid Alkanes. Ⅰ. Thermodynamics and Structures of Normal Alkanes : n-butane to n-heptadecane
이송희 ; 이홍 ; 박형석 ; Jayendran C. Rasaiah ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 735~744
We present results of molecular dynamic (MD) simulations for the thermodynamic and structural properties of liquid n-alkanes, from n-butane to n-heptadecane, using three different models Ⅰ-Ⅲ. Two of the three classes of models are collapsed atomic models while the third class is an atomistically detailed model. Model Ⅰ is the original Ryckaert and Bellemans' collapsed atomic model [Discuss. Faraday Soc. 1978, 66, 95] and model Ⅱ is the expanded collapsed model which includes C-C bond stretching and C-C-C bond angle bending potentials in addition to Lennard-Jones and torsional potentials of model Ⅰ. In model Ⅲ all the carbon and hydrogen atoms in the monomeric units are represented explicitly for the alkane molecules. Excellent agreement of the results of our MD simulations of model Ⅰ for n-butane with those of Edberg et al.[J. Chem. Phys. 1986, 84, 6933], who used a different algorithm confirms the validity of our algorithms for MD simulations of model Ⅱ for 14 liquid n-alkanes and of models Ⅰ and Ⅲ for liquid n-butane, n-decane, and n-heptadecane. The thermodynamic and structural properties of models Ⅰ and Ⅱ are very similar to each other and the thermodynamic properties of model Ⅲ for the three n-alkanes are not much different from those of models Ⅰ and Ⅱ. However, the structural properties of model Ⅲ are very different from those of models Ⅰ and Ⅱ as observed by comparing the radial distribution functions, the average end-to-end distances and the root-mean-squared radii of gyrations.
Collision-Induced Electronic Relaxation of Thiophosgene (S₁)
김택수 ; Choi, Young S. ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 745~749
Fluorescence from the electronically excited thiophosgene (Cl2CS) in its first excited singlet state (S1) is efficiently quenched by collision. Rates of the collision-induced electronic relaxation were obtained for various vibrational levels in the S1 state by measuring the fluorescence lifetimes. We found that the relaxation process is strongly energy-dependent; the rate consistently increases by a factor of ~40 with the increase of vibrational energy from 0 to 1450 cm-1. Collision-induced intersystem crossing from the S1 to the first triplet state (T1) is attributed to the major process responsible for the electronic relaxation.
Analysis of Rotationally Cooled Vibronic Emission Spectra (
) of m-Xylyl Radical
최익순 ; 이상국 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 749~753
The rotationally cooled but electronically excited m-xylyl radical has been generated in a jet from the gas mixture of precursor m-xylene and buffer gas He by a technique of corona excited supersonic expansion. The visible vibronic emission spectra in the transition of 12A2→12B2 of m-xylyl radical in the gas phase have been recorded using a Fourier transform spectrometer. The spectra have been analyzed for the assignments of the vibrational frequencies in the electronic ground state with combination of the torsional frequencies reported previously.
Density Functional Theory Study of Vibrational Spectra of Anthracene Neutral and Radical Cation
이상연 ; 부봉현 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 754~759
Ab initio Hartree-Fock and Becke 3-Lee-Yang-Parr (B3LYP) density functional theory calculations using 6-31G* basis set were carried out to study the vibrational spectra of anthracene neutral (h10 and d10) and radical cation (h10). We report results of the fundamental vibrational frequencies obtained on the basis of the calculations. The assignments of fundamentals show a one-to-one correspondence between the observed and calculated fundamentals.
Molecular Structure and Vibrational Spectra of 9-Fluorenone Density Functional Theory Study
이상연 ; 부봉현 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 760~764
The molecular geometry and vibrational frequencies of 9-fluorenone have been calculated using the Hartree-Fock and Becke-3-Lee-Yang-Parr(B3LYP) density functional methods with 6-31G* basis set. Harmonic vibrational frequencies obtained from the B3LYP calculation show good agreement with the available experimental data. A few vibrational fundamentals are newly assigned based on the B3LYP results. The B3LYP calculation is reconfirmed to be useful in the assignment of the fundamental vibrational frequencies.
Selective Hydrogenation of 2-Cyclohexen-1-One with Ruthenium(II) and Osmium(II) Complexes
김란 ; 이원용 ; 전무진 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 765~766
Density Functional Study on Polyacetylene Cations
이보순 ; 소자영 ; 이성율 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 767~768
Development of the Sample Introduction Systems for the Analysis of the Powdered Samples in ICP-AES : Ⅰ. Preliminary Studies (ETV-ICP-AES)
이개호 ; 박순아 ; 이문펴 ; 강성식 ; 박민준 ;
Bulletin of the Korean Chemical Society, volume 17, issue 8, 1996, Pages 769~771