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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 16, Issue 12 - Dec 1995
Volume 16, Issue 11 - Nov 1995
Volume 16, Issue 10 - Oct 1995
Volume 16, Issue 9 - Sep 1995
Volume 16, Issue 8 - Aug 1995
Volume 16, Issue 7 - Jul 1995
Volume 16, Issue 6 - Jun 1995
Volume 16, Issue 5 - May 1995
Volume 16, Issue 4 - Apr 1995
Volume 16, Issue 3 - Mar 1995
Volume 16, Issue 2 - Feb 1995
Volume 16, Issue 1 - Jan 1995
Selecting the target year
Characterization of An Oxygen Species in Copper Oxide-Alumina System
한종수 ; 천학제 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 787~789
Nonnegligible Dynamical Consequences of Vibration-Pseudorotation Coupling in a Symmetric Triatomic Molecule
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 789~792
Photochemical Intramolecular Diels-Alder Reactions of 1-Substituted Cyclopentadienes by Triplex Formation
윤효정 ; 정원식 ; 장보빈 ; 채우기 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 792~793
Syntheses and Spectroscopic Characterization of Octabromotetrakis(2,6-difluorophenyl)-21-thiaporphyrin and Tetrabromotetrakis(2,6-difluorophenyl)-21,23-dithiaporphyrin
신구 ; 김정호 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 793~795
Rovibronic Spectrum of Cold Benzyl Radical
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 795~797
Photoaddition Reactions of Some Alkynes to Duroquinone and Photochemical Transformation of the Photoadducts
김성식 ; 김애란 ; 유동진 ; 심상철 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 797~799
Novel Migration of Aryl Group in 3-Trifluoro-methylpyrazolyl Aryl Ether
박경호 ; 조성윤 ; 김성수 ; 윤을건 ; 유찬모 ; 황기준 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 799~801
Dynamics of OH Photodissociation above the Threshold to O(¹D) : A Quantum Mechanical Analysis
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 801~803
Synthesis and Hydrogenation Reaction of Iridium Complexes Containing L-Methionine Methyl Ester
박영애 ; 김지향 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 803~804
Synthesis of 2-Amino-4,6-Di-O-Benzoyl-3-O-Benzyl-1,2-Dideoxy Mannojirimycin
조재익 ; 윤신숙 ; 천근호 ; Shin, Jeong E. ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 805~808
Diacetone-D-glucose was converted into 5-azido-6-O-benzoyl-3-O-benzyl-5-deoxy-1,2-O-isopropylidene-α-D-glucofuranose. After removal of isopropylidene and benzoyl protecting groups, hydrogenation performed reduction of azide and subsequent cyclization by reductive amination to give 3-O-benzyl-1-deoxy nojirimycin in high yield. The second azide group was introduced on 2-carbon by selective substitution reaction, and reduction of azide to amino group gave titled compound.
SERS on Silver Formed in Anodic Aluminum Oxide Nanotemplates
주영 ; 서정상 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 808~810
A strong SERS effect has been observed on silver surfaces which were prepared by Ag deposition in anodic aluminum oxide nanotemplates and subsequent partial removal of the oxide layers. The advantage of these surfaces for SERS studies is that the controlled size and dispersion of Ag particles can be achieved.
CARS Spectra of HCI, N₂, and C₂H₂ in the Gas Phase
백선종 ; 김중희 ; 박주연 ; 이성열 ; 김홍래 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 810~813
Coherent anti-Stokes Raman scattering (CARS) spectra of HCl, N2, and the ν1 fundamental of C2H2 have been measured in the gas phase. The measured spectra show rotational structures which originate from the Q-branch transitions. The spectra have successfully been simulated with proper selection rules, line positions, and relative intensities from room temperature Boltzmann population distributions. The vibration-rotation interaction constant α of HCl in the ground electronic state has been measured from the rotationally resolved CARS spectra which is α=0.3076 cm-1. Possibilities of optical pumping and of measuring state specific energy distributions of molecules are discussed.
Synthesis of Diamond-Like Carbon Films on a TiO₂ Substrate by DC-Discharge Plasma Enhanced Chemical Vapor Deposition
구수진 ; 김창민 ; 지종기 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 813~818
A diamond-like carbon (DLC) film was produced on a TiO2 substrate using a plasma enhance chemical vapor deposition (PECVD) method. The CH4-H2 plasma was produced by applying 400 V DC. The DLC film with the best crystalline structure was obtained when the concentration of CH4 in H2 was 0.75 percent by volume and total pressure was 40 torr. The presence of the diamond structure was confirmed by Raman spectroscopy, X-ray diffraction, and scanning electron microscopy methods. It was found that the diluting gas H2 played an important role in producing a DLC film using a PECVD method.
Electrochemistry and Electrokinetics of Prussian Blue Modified Electrodes Obtained Using Fe(III) Complex
문성배 ; 문정대 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 819~823
Thin films of two kinds of Prussian Blue (PB)-modified, using iron(Ⅲ) complex instead of conventional FeCl3, were prepared on a gold substrate and these films were able to be electrochemically reduced in potassium nitrate solution. In case of PB-modified films prepared from Fe(Ⅲ)-ethylenediamine-N,N'-diacetic acid (FeEN3+)/K3Fe(CN)6 solution, the mid-peak potential was 0.156 V in 0.1 M KNO3 and it was found that potassium ion migrates into or out of the film during the electrolysis. These films were shown to be electrochromic. These films exhibited smaller peak separation than those formed from Fe(Ⅲ)-tartaric acid (FeTA3+)/K3Fe(CN)6 system. The diffusion coefficient of Fe(CN)63-/4- redox couple, evaluated using the fabricated Au rotating disc electrode(rde) previously reported, was in good agreement with the existing data. Two experimental procedures, including the voltammetry at relatively low scan rates and the rde study, have been used in order to characterize the electrode kinetics. The electrode kinetics of some redox couples (FeEN2+-FeEN3+ and FeTA2+-FeTA3+) on both PB-modified thin films and bare Au electrode were studied using a Au rde. In all cases the rate constants of electron transfer obtained with the PB-modified film electrodes were only slightly less than those obtained for the same reaction on bare Au disc electrodes. The conductivities, as determined from the slopes of the i-V curves for a ca. 1 mm sample for dried PB-modified potassium-rich and deficient bulk samples pressed between graphite electrodes, were 6.21 × 10-7 and 2.03 × 10-7(Ω·cm)-1, respectively.
The Crystal Structure of a Sulfur Sorption Complex of the Dehydrated Partially
-Exchanged Zeolite A
염영훈 ; 송성환 ; 김양 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 823~826
The crystal structure of a sulfur sorption complex of the dehydrated partially Co2+ exchanged zeolite A (a=12.058(2) Å) has been determined by single-crystal X-ray techniques. The crystal structure was solved and refined in cubic space group Pm3m at 21(1) ℃. Ion Exchange with aqueous 0.05 M Co(NO3)2 was done by the static method. The crystal of Na4Co4-A was dehydrated at 380 ℃ and 2 × 10-6 Torr for 2 days, followed by exposure to about 100 Torr of sulfur at 330 ℃ for 72 h. Full matrix least-squares refinement converged to R1=0.084 and Rw=0.074 with 102 reflections for which I > 3σ(I). Crystallographic analysis shows that 2.8 Co2+ ions and 4 Na+ ions per unit cell occupy 6-ring sites on the threefold axes. 1.2 Co2+ ions occupy the 8-ring sites on fourfold axes. 2.8 Co2+ ions at Co(1) are recessed 0.66 Å into the large cavity and 4 Na+ ion at Na(1) are recessed 0.77 Å into the sodalite cavity from the (111) plane of O(3)'s. Approximately 16 sulfur atoms were sorbed per unit cell. Two S8 rings, each in a butterfly form, are found in the large cavity. The bond length between S and its adjacent S is 2.27(3) Å. The distance between 6-ring Co2+ ion and its adjacent sulfur is 2.53 (2) Å and that between 8-ring Co2+ ions and its adjacent sulfur is 2.72(9) Å. The angles of S-S'-S and S'-S-S'/ in octasulfur rings are 119.0(2)°and 113.0(2)°, respectively.
Tightness of the Transition State for the Reactions of Secondary Alkyl Arenesulfonates with Anilines in Acetonitrile
오혁근 ; 권영봉 ; 정동수 ; 이익춘 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 827~831
Kinetic studies on the reactions of five secondary acylic alkyl arenesulfonates with anilines are carried out in acetonitrile at 65.0 ℃. The magnitude of ρXZ determined (ρXZ=0.12-0.13) is slightly greater than that for the alicyclic series (ρXZ=0.11) under the same experimental condition. Ab initio MO results are found to support the slightly tighter transition state expected from the greater magnitude of ρXZ for the acyclic series. Despite the small variations, the magnitude of ρXZ and the theoretical transition state tightness remain relatively constant for the secondary carbon centers. Secondary kinetic isotope effects involving deuterated aniline nucleophiles show a successively smaller kH/kD(<1.0) value for a more sterically crowded reaction center carbon. This is in accord with the later transition state for bond-making predicted by the Bell-Evans-Polanyi principle for the more endothermic nucleophilic substitution reaction. Further support is provided by the results of the AM1 MO calculations on the reactions of secondary alkyl benzenesulfonates with chloride nucleophile.
The Near Infrared Spectroscopic Studies of the Hydrogen Bonding Between Thioacetamide and Azines in Nonaqueous Solutions
이상현 ; 박정희 ; 윤창주 ; 최영상 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 831~834
The nature of hydrogen bonding between thioacetamide and azines has been thoroughly investigated using near IR absorption spectroscopy. The νN-H + amide II combination band in thioacetamide (TA) has been analyzed to determine the thermodynamic constants for the formation of hydrogen bonded 1:1 TA:azine complexes in CCl4 and CHCl3 solutions. The relative stabilities of TA-azine complexes (pyridine->1,2-diazine->1,3-diazine->1,4-diazine-TA) are in good agreement with the relative proton affinities of azines in the gas phase. The results serve as a basis for analyzing the factors which influence the hydrogen bonding formation of TA in nonaqueous solutions.
Preparation and Structure of Re(≡NC_
박병규 ; 김영웅 ; 정건수 ; 박희숙 ; Lee, Soon W. ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 835~839
Mer,trans-Re(≡NC6H5)(PPh3)2Cl3, Ⅰ, reacted with trimethylphosphine to give a mixture of two stereoisomers, mer,trans-Re(≡NC6H5)(PMe3)2Cl3,Ⅱ, and fac,cis-Re(≡NC6H5)(PMe3)2Cl3, Ⅲ. These compounds could also be prepared from the reaction of Re(≡NC6H5)(PMe3)(PPh3)Cl3 with trimethylphosphine. In both reactions the mer,trans-isomer is a major product. The products have been characterized by NMR, elemental analysis, and X-ray crystallography. Crystal data for Ⅱ: monoclinic space group P21, a=10.053(1) Å, b=10.844(1) Å, c=10.058(2) Å, β=113.45(2)°, Z=2, R(wR2)=0.0348 (0.0894). Crystal data for Ⅲ: monoclinic space group P21/n, a=7.183(2) Å, b=16.983(4) Å, c=15.543(4) Å, β=90.38(2)°, Z=4, R(wR2)=0.0603 (0.1484).
Kinetics and Mechanism of Aminolysis of Phenyl Benzoates in Acetonitrile
고한중 ; 이호찬 ; 이해황 ; 이익춘 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 839~844
The kinetics and mechanism of the reactions of phenyl benzoates with benzylamines and pyrrolidine are investigated in acetonitrile. The variations of ρX (ρXY>0) and ρZ (ρYZ<0) with respect to the substituent in the substrate (σY) indicate that the reactions proceed through a tetrahedral intermediate, T±, with its breakdown in the rate determining step. The large magnitudes of ρZ, ρXY and ρYZ as well as the effects of secondary kinetic isotope effects involving deuterated nucleophiles are also in line with the proposed mechanism.
Systematic Analysis of Bandgap Evolution of Conjugated Polymers
Hong, Sung Y. ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 845~850
A systematic method is presented to analyze the bandgaps of conjugated polymers in terms of geometrical relaxations and electronic effect of moieties using the equation of Eg=ΔEδr + ΔE1-4 + ΔEel. The relationship between ΔEδr and δr is derived from trans-PA and is transferred to other conjugated polymeric systems. By applying this method to heterocyclic polymers, very useful information is obtained to understand the evolution of bandgaps of PT, PPy and PF in connection with the chemical structures and electronic effect of the heteroatoms. We believe that this method is very helpful to understand the evolution of bandgaps of various conjugated polymers in connection with the chemical structures and electronic effect of moieties. Also, the method is expected to provide valuable information to design a small bandgap polymers.
Configuration Interaction Theory and van der Waals Predissociation
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 850~858
Golden-rule like formulas have been used without theoretical basis to calculate the resonance lifetimes and final state distributions in the predissociation of van der Waals molecules. Here we present their theoretical basis by extending Fano's configuration interaction theory. Such extensions were independently done by Farnonux [Phys. Rev. 1985, 25, 287] but his work, unfortunately, was not well known outside some small group of people in the field of Auger spectroscopy. Since my extension is easier to understand than his, it is presented here. Theoretical basis of Golden rule like formulas used in the predissociation of van der Waals molecules was obtained by using such extensions. Factors responsible for several aspects of predissociation dynamics, such as variations of dynamics as functions of resonance lifetimes, or variations in shapes of final quantum state distributions of photofragments around resonances, were identified. Parameters, or dynamical information that could be obtained from the measurement of partial cross section spectra were accordingly determined. The theory was applied to the vibrational predissociation of triatomic van der Waals molecules and its result was compared with those calculated by close-coupling method. An example where Golden-rule like expression fails and branching ratios vary greatly around a resonance was considered.
Asymmetric Synthesis of 12-epi-
by a Palladium-Mediated, Three-Component Coupling Reaction
이남호 ; Richard C. Larock ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 859~863
The prostaglandin analogue 12-epi-PGF2α (2) has been synthesized from optically active cis-4-t-butyldimethylsilyloxy-2-cyclopenten-1-ol (4b) in 4 steps in an overall yield of 21%. An extremely efficient Pd(Ⅱ)-mediated, three-component coupling reaction is employed to obtain the key intermediate 9.
Assignment of ¹H and
Nuclear Magnetic Resonances of Ganglioside
이경익 ; 전길자 ; 류경임 ; 방은정 ; 최병석 ; 김양미 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 864~869
Investigation of the structures of the gangliosides has proven to be very important in the understanding of their biological roles such as regulation of differentiation and growth of cells. We used nuclear magnetic resonance spectros-copy in order to investigate the structure of GA1. In order to do this, the assignment of spectra is a prerequisite. Since GA1 does not have polar sialic acid, the spectral overlap is severe. In order to solve this problem, we use 2D NMR spectroscopy and heteronuclear 1H/13C correlated spectroscopy in this study. Here, we report the complete assignment of the proton and the carbon spectra of the GA1 in DMSO-d6-D20 (98:2, v/v). These assignments will be useful for interpreting 1H and 13C NMR data from uncharacterized oligosaccharides and for determining the linkage position, the number of sugar rings, and the sequence of new ganglioside. Amide proton in ring Ⅲ shows many interring nOes and has intramolecular hydrogen bonding. This appears to be an important factor in tertiary folding of GA1. Based on this assignment, determination of three dimensional structure of GA1 will be carried out. Studies on the conformational properties of GA1 may lead to a better understanding of the molecular basis of its functions.
Synthesis and Characterization of
동용관 ; 도정환 ; 윤호섭 ; 이영주 ; 신희균 ; 류광경 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 870~873
A new ternary transition-metal selenide, Ta2Ni3Se8 has been synthesized from a eutectic halide flux. The structure of this phase has been characterized by single crystal X-ray diffraction techniques. The compound crystallizes in the orthorhombic system (D2h9-Pbam, a= 14.788(4) Å, b= 10.467(3) Å, c=3.4563(8) Å) with two formula units in the unit cell. This compound adopts the Nb2Pd3Se8 structure type. Hence, there are two chains of edge-sharing selenium trigonal prisms centered by tantalum atoms and these chains are interconnected through two kinds of nickel atoms. Nickel occupies both square planar and square pyramidal sites as does palladium in Nb2Pd3Se8. Electrical conductivity measurements indicate that this material is semiconducting.
A Theory on Phase Behaviors of Diblock Copolymer/Homopolymer Blends
윤경섭 ; 박형석 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 873~885
The local structural and thermodynamical properties of blends A-B/H of a diblock copolymer A-B and a homopolymer H are studied using the polymer reference interaction site model (RISM) integral equation theory with the mean-spherical approximation closure. The random phase approximation (RPA)-like static scattering function is derived and the interaction parameter is obtained to investigate the phase transition behaviors in A-B/H blends effectively. The dependences of the microscopic interaction parameter and the macrophase-microphase separation on temperature, molecular weight, block composition and segment size ratio of the diblock copolymer, density, and concentration of the added homopolymer, are investigated numerically within the framework of Gaussian chain statistics. The numerical calculations of site-site interchain pair correlation functions are performed to see the local structures for the model blends. The calculated phase diagrams for A-B/H blends from the polymer RISM theory are compared with results by the RPA model and transmission electron microscopy (TEM). Our extended formal version shows the different feature from RPA in the microscopic phase separation behavior, but shows the consistency with TEM qualitatively. Scaling relationships of scattering peak, interaction parameter, and temperature at the microphase separation are obtained for the molecular weight of diblock copolymer. They are compared with the recent data by small-angle neutron scattering measurements.
Voltammetric Behaviors of Chemically Modified Electrodes Based on Zirconium Phosphonate Film
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 886~891
Electroactive monolayers based on zirconium(Ⅳ) phosphonate film were prepared on gold and tin oxide electrodes by sequential layer-by-layer depostion technique. High transfer coefficient values and surface coverages of surface bound redox molecules were obtained from the electrochemical measurements of heterogeneous electron transfer rates for monolayer modified electrodes. 1,10-Decanediylbis(phosphonic acid) (DBPA) monolayer as insulating barrier was effective in blocking electron transfer. However, these film modified oxide electrode shows voltammetric behavior of diffusion/permeation process taking place at very small exposed area of modified electrode through channels due to structural defects within film when a very fast redox couple such as Ru(NH3)63+ is hired.
Synthesis of 4,5-Disubstituted-2,7-diazabicyclo[3.3.0.]octane Derivatives by Intramolecular Cyclization Reaction
이재욱 ; 정연의 ; 손호정 ; 윤걸정 ; 공면식 ; 김대영 ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 892~893
Determination of Si in Ultra Fine Al₂O₃ Powder Using Matrix Elimination in Inductubely Coupled Plasma-Atomic Emission Spectrometry
Lim, H. B. ; Hyun, J. H. ; Lee, W. ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 894~896
Nickel Complex as a Radical Inhibitor in the Oxidation Reactions by Dioxygen Plus Aldehyde
남원우 ; 황원구 ; Baek, Seung J. ; Sohn, Byoung C. ;
Bulletin of the Korean Chemical Society, volume 16, issue 9, 1995, Pages 896~898