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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 7, Issue 6 - Dec 1986
Volume 7, Issue 5 - Oct 1986
Volume 7, Issue 4 - Aug 1986
Volume 7, Issue 3 - Jun 1986
Volume 7, Issue 2 - Apr 1986
Volume 7, Issue 1 - Feb 1986
Selecting the target year
Effects of Li
Ions on the Rotational Barrier in Acetamide and propionamide System
Kwon, Dae-Keun ; Choi, Young-Sang ; Yoon, Chang-Ju ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 1~5
The influences of
on the N-C(O) rotational barrier of N,N-dimethylacetamide and N,N-dimethylpropionamide have been investigated. The rotational activation free energy
-amide complexes is found to increase with increasing salt concentration. On the other hand, that for
-amide complexes increases in the presence of
ion up to 0.25 M ion concentration and then decreases as the concentration of
ion is further increased. Such an unusual behavior of
-amide complexes has been interpreted in terms of ion-pairing and diluent effect on the amides. However,
nmr chemical shift data for the amides have shown that both of these ions interact primarily with the carbonyl group in amides.
Overlap Integrals and Recoursion Formulas for Morse Wavefunction
Lee, Mu-Sang ; Carreira, L.A. ; Berkowitz, D.A. ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 6~12
Overlap integrals for the case in which the ground and excited states are represented by Morse potential functions were derived. In order to calculate the spectral intensities in Morse wavefunctions, a method of expanding the wavefunctions of one state in terms of the other was developed to allow the ground and the excited state frequencies to be different. From the expansion of Morse wavefunctions, recursion formulas were developed for variational matrix elements of Morse wavefunctions. The matrix elements can be calculated using these recursion formulas and the diagonalized results which eigenvalues (allowed energies) were all successfully satisfied to Morse energy formulas.
Lead Tolerance of Noble Metal Catalysts for CO Oxidation
Chang, Tu-Won ; Sohn, Youn-Soo ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 12~15
Lead tolerance of
$Pt/Al_2O_3$ catalysts was evaluated for CO oxidation depending on the properties of the alumina supports and base metals added as promoter. Among the four different alumina supports, the support with a large macropore volume (0.45 cc/g) and 5% Ce has shown the best resistence to lead poisoning. Most of the base metals added to the Pt-catalysts were found to be ineffective for improving lead resistence, but boron has shown an excellent lead tolerence, although it decreases the initial catalytic activity.
Calculation of the Dipole Moments for Square Pyramidal Complexes
Ahn, Sang-Woon ; Yuk, Geun-Yong ; Park, Eui-Suh ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 15~20
Modified technique in calculating the dipole moments for square pyramidal complexes has been developed and then the dipole moments for bisacetylacetonato(oxo)vanadium(Ⅳ) complexes are calculated, adopting this approach. The calculated dipole moments for bisacetylacetonato(oxo)vanadium(Ⅳ) in benzene and bisacetylacetonato(oxo)vanadium in dioxane solutions are in agreement with the observed values. The calculated dipole moments of bisacetylacetonato(oxo)vanadium(Ⅳ) in dioxane solution is slightly higher than that of bisacetylacetonato(oxo)vanadium(Ⅳ) in benzene. Such a result may suggest that bisacetylacetonato(oxo)vanadium(Ⅳ) interact with dioxane molecule to form bisacetylacetonato(oxo)vanadium(Ⅳ)-dioxane adduct. This calculated dipole moments are also in agreement with the experimental results.
Phase Transition and Approximated Integral Equation for Radial Distribution Function
Yoon, Byoung-Jip ; Jhon, Mu-Shik ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 20~23
A reduced condition for liquid-gas phase transition from the singularity of compressibility is derived using diagrammatic approach and is examined in the hard sphere system. The condition turns out that the Percus-Yevick and the Hyper-Netted-Chain approximation never conceive the idea of phase transition, and explains that the liquid-gas transition does not exist in hard sphere system. The solid-fluid transition is considered on the viewpoint of correlation function and diagrammatic analysis.
Synthesis of Nucleophilic Adducts of Thiols (Ⅶ). Addition of Thioglycolic Acid to
-phenylacrylic Acid Derivatives
Huh, Tae-Sung ; Lee, Hee-Jong ; Han ,In-Sup ; Kim, Tae-Rin ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 23~25
acid derivatives (Ⅰ) with thioglycolic acid in the molar ratio of 1:2 in saturated sodium bicarbonate solution yielded 3-(4'-oxo-2'-thiazolin-2'-yl)-2-phenyl-4-oxotetrahydrothiophene derivatives (V). Thioglycolic acid was found to be added not only to carbon-carbon double bond but also to carbon-nitrogen triple bond and those adducts were cyclized to V.
Kinetics and Thermodynamic Studies on the Reaction of Cysteine with Cinnamaldehyde
Kim, Tae-Rin ; Yun, Se-Joon ; Park, Byung-Bin ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 25~29
The reaction of cysteine with cinnamaldehyde have been studied kinetically and thermodynamically. It was found that the reaction proceeds in two steps; formation of the monoadduct by a Michael type addition followed by the nucleophilic attack of the second cysteine to the carbonyl carbon of the monoadduct to afford the thiazolidine derivative. A reaction profile for the reaction of cysteine with cinnamaldehyde was constructed based on the thermodynamic parameters analyzed for the forward and the reverse reactions. It was assumed that the second step of this reaction accompanies an intermediate, a Schiff base.
A Study of Nonstoichiometric Empirical Formulas for Semiconductive Metal Oxides
Kim, Kyung-Sun ; Lee, Kwan-Hee ; Cho, Ung-In ; Choi, Jae-Shi ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 29~35
An empirical formula for semiconductive metal oxides is proposed relating nonstoichiometric value x to a temperature or an oxygen partial pressure such that experimental data can be represented more accurately by the formula than by the well-known Arrhenius-type equation. The proposed empirical formula is log x = A +
for a temperature dependence and
for an oxygen partial pressure dependence. The A, B, C, D and a, b, c, d are parameters which are evaluated by means of a best-fitting method to experimental data. Subsequently, this empirical formula has been applied to the n-type metal oxides of
, and the p-type metal oxides of
. It gives a very good agreement with the experimental data through the best-fitted parameters within 6% of relative error. It is also possible to explain approximately qualitative characters of the parameters A, B, C, D and a, b, c, d from theoretical bases.
Ihn, Gwon-Shik ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 36~38
The Ferricyanide-sensing electrodes were prepared with
(mole ratio 3:1-7:1). The 5:1
composition is superior to others in terms of potentiometric response, rapidity of response and reproducibility. Testing was done over the concentration range
at pH 6.8 with constant ionic strength. The concentration-potential curve was linear and coincided with the Nernstian slope (19.7 mV/decade). Interfering ions were
and the life time of this electrode was 3 weeks. This electrode could be used as the indicator electrode for measuring the ferricyanide and ferrocyanide.
Epr Study of the 10-Tungsto-2-vanado(Ⅳ, Ⅴ)phosphate Anion, [PV(Ⅳ)VW
Lee, Chul-Wee ; So, Hyun-Soo ; Lee, Kyu-Ryong ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 39~41
The polycrystalline epr spectrum of
doped into host crystals and its solution spectrum are reported. The solution spectrum consists of fifteen lines, indicating that the unpaired electron is hopping fast between the two vanadium atoms. The polycrystalline spectrum, which consists of three sets of fifteen lines, was analyzed as a spectrum of an I = 7 system and the epr parameters were determined. The spectrum cannot be interpreted by assuming that each line appears at the average magnetic field of two hyperfine lines expected for two uncoupled vanadium atoms.
Excimer Fluorescence Quenching of Poly (styrene-co-acrylic acid)-Eu Complex by Simple Hydrocarbons in Tetrahydrofuran Solutions
Park, Doo-Hee ; Kim, Kang-Jin ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 42~45
Quenching of excimer fluorescence from polystyrene-acrylic acid copolymers containing
has been studied in tetrahydrofuran solution using simple aromatic hydrocarbons as quenchers under steady-state conditions. Aromatic hydrocarbons quenched collisionally the excimer fluorescence and their rate constants of quenching were determined. The magnitude of quenching constant is interpreted in terms of the cube root of the molar volume of quencher. Cycloalkanes were not effective in quenching the excimer fluorescence possibly due to different solubility characteristics from aromatic hydrocarbons.
Separation of D and L Amino Acids by High-Performance Liquid Chromatography
Lee, Sun-Haing ; Ryu, Jae-Wook ; Park ,Kyoung-Sug ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 45~50
Separation of optical isomers of some derivatives of amino acids by reversed-phase HPLC has been accomplished by adding a chelate of an optically active amino acid to copper(Ⅱ) to the mobile phase. Cu(Ⅱ) complexes of L-proline and L-hydroxyproline in the mobile phase showed different degrees of separation. Optical isomers of DNS derivatives of amino acids are selectively separated, but those of several other derivatives are not at all. The kinds of buffer agents, the pH, and the concentrations of acetonitrile and the Cu(Ⅱ) ligand all affect the separations. The elution behavior between D and L DNS-amino acids appears to depend on the alkyl side chain of the amino acids. A chromatographic mechanism is proposed that is based on a stereospecificity of the formation of ternary complexes by the D, L-DNS-amino acids and the chiral additive associated with the stationary phase. The steric effects of the ligand exchange reactions are related with the feasibility of cis and/or trans attack of the amino acids to the binary chiral chelate retained on the stationary phase.
Emission for Pb
Centers in RbCl Single Crystal Excited within the A-Absorption Band
Gang, Jun-Gill ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 50~52
The emission spectra of RbCl:
excited in the A-absorption band at various temperatures are reported and the excitation spectra are also investigated. The relaxed excited states able to explain the two A-emission bands are proposed.
cis Photoisomerization and Fluorescence of trans 1,2-Bispyrazylethylene: pH, Salt and Heavy Atom Effects
Shim, Sang-Chul ; Bong, Pill-Hoon ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 53~55
photoisomerization and fluorescence of trans-1,2-bispyrazylethylene were investigated in various conditions. The quantum yields of the
photoisomerization and the fluorescence intensity of trans-1,2-bispyrazylethylene decrease on going from neutral to acidic or basic solutions. The quantum yields of photoisomerization, however, are little affected by changing the concentration of salt while the fluorescence intensity increases as the concentration of salt increases. pH and salt effects on the energy levels of
states lead to opposing changes in photoisomerization and fluorescence quantum yields. The heavy atom effect on the fluorescence of 1,2-bispyrazylethylene was also investigated.
Surface-enhanced Raman Scattering on Chemically Prepared Silver Film for Trace Analysis
Boo, Doo-Wan ; Kim, Kwan ; Kim, Myung-Soo ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 55~58
Analytical capability of surface-enhanced Raman scattering has been evaluated. Silver films prepared by homogeneous chemical reduction were used as the substrate. Detection limits for p-nitrobenzoic acid, thiophenol and rhodamine 6G were around
Red Shift of the Raman (FBCARS) Excitation Profile of Iodine from the Absorption Spectrum(I)
Lee, Mu-Sang ; Carreira, L.A. ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 59~62
Folded Box coherent anti-Stokes Raman spectroscopy (FBCARS) spectra of the fundamental symmetric stretch(213
) and the first overtone(421
have been recorded over the pump wavelength range from 495 nm to 580 nm. The lineshapes were fitted using the least squares method and the A and C term of CARS were calculated. From the fitting of A and C terms, the real(R) and imaginary(I) term intensity of CARS were calculated using harmonic oscillator program. The calculated CARS excitation profile of
with R and I term data was about 270
red shifted from the absorption spectrum.
Concentration Dependences of the Isotropic Raman Line Widths of Acetonitrile and Acetonitrile-d
in Carbon Tetrachloride
Choe, Joong-Chul ; Kim, Myung-Soo ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 63~66
Concentration dependences of the isotropic Raman line widths for the
(C-H and C-D) and the
solutions have been investigated. For the
modes, the dephasing seems to be a good description for the isotropic line broadening in
solution even though the concentration fluctuation can reproduce the experimental results also. For the
modes, the concentration fluctuation was the dominant mechanism for the concentration-dependent line broadening.
Attempts on the Preparation of Lithium Trialkoxyborohydrides. Stability and Stereoselective Reduction of Cyclic Ketones
Cha, Jin-Soon ; Kim, Jin-Euog ; Lee, Jae-Cheol ; Yoon, Mal-Sook ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 66~69
The reaction of potassium trialkoxyborohydrides of varying steric requirements with lithium chloride in tetrahydrofuran(THF) was examined in detail to establish the generality of this synthesis of the corresponding lithium trialkoxyborohydrides. The metal ion exchange reaction between potassium triisopropoxyborohydride and lithium chloride in THF proceeded instantly at room temperature and the corresponding lithium salt was very stable toward disproportionation. However, for R = s-Bu, t-Bu and 2-methylcyclohexyl, with increasing steric requirement, the lithium derivatives were unstable and thus dissociated into
. The stereoselectivity of lithium triisopropoxyborohydride(LIPBH) in the reduction of representative cyclic ketones was examined and compared with that of the potassium derivative.
t-Butyl Benzotriazol-1-yl Carbonate and Benzyl Benzotriazol-1-yl Carbonate. Now Reactive Amino Protective Reagents for t-Butoxycarbonylation and Benzyloxycarbonylation of Amines and Amino Acids
Kim, Sung-Gak ; Chang, Heung ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 70~73
New amino protective reagents, t-butyl benzotriazol-1-yl carbonate and benzyl benzotriazol-1-yl carbonate, for t-butoxycarbonylation and benzyloxycarbonylation of amines and amino acids have been developed. t-Butyl benzotriazol-1-yl carbonate reacts rapidly and cleanly with various amines and amino acids to afford N-Boc amines and N-Boc amino acids in high yields and benzyl benzotriazol-1-yl carbonate is also found to be very effective in the benzyloxycarbonylation of amino acids.
Characterization of Korean Clays and Pottery by Neutron Activation Analysis (I). Characterization of Korean Porcelainsherds
Lee, Chul ; Kwun, Oh-Cheun ; Kang, Hyung-Tae ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 73~77
Data on the concentration of Na, K, Sc, Cr, Fe, Co, Cu, Ga, Rb, Cs, Ba, La, Ce, Sm, Eu, Tb, Lu, Hf, Ta, and Th obtained by neutron activation analysis have been used to characterize Korean porcelainsherds by multivariate analysis. The mathematical approach employed is principal component analysis (PCA). PCA was found to be helpful for dimensionality reduction and for obtaining information regarding (a) the number of independent causal variables required to account for the variability in the overall data set, (b) the extent to which a given variable contributes to a component and (c) the number of causal variables required to explain the total variability of each measured variable.
Photosensitized Lysis of Egg Lecithin Liposomes by L-Tryptophan and N-Acetylphenylalanyl-L-Tryptophan
Cho, Dae-Won ; Yoon, Min-Joong ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 78~81
The photosensitized lysis of egg lecithin lipid membranes (liposomes) have been performed to UV-B light (270-320 nm) by L-tryptophan(L-Trp) and its peptide such as N-acetylphenylalanyl-L-tryptophan(NAPT) incorporated in the liposomes(ca. 0.1% by weight) or in the external buffer (0.1-0.3 mM). Requirement of oxygenation suggests that the lysis of liposomes is caused by the photosensitized oxidation of lipids. There was significant protection against lysis photosensitized by Trp in the external buffer by low concentration of ferricyanide (0.8 mM), but there was no effect on the lytic efficiency by
which is singlet oxygen(
) quencher, indicative of an electron transfer mechanism involved in the photosensitization. The small change of the lytic efficiency with increasing pH from 4 to 9 was interpreted by large target theory and subsequently indicates that superoxide(
) may be an active intermediate for the oxidation. The efficiency of photosensitization of Trp was higher than that of NAPT under the same experimental condition. The weak lytic efficiency of liposomes photosensitized by NAPT was enhanced by incorporating NAPT in liposomes, but it was again quenched by
-carotene incorporated in the bilayer of liposomes. These results indicate that a portion of liposome lysis may be due to
formation from the excited NAPT.
The Electronic Structure of Co(N-[2-((2-aminoethyl)thio)ethyl]-2-aminoacetamide)(NO
Lee, Kuk-Haeng ; Kim, Ja-Hong ; Cheun, Young-Gu ; Lee, Gae-Soo ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 82~83
Intercalation Complex of Vanadium (III) oxychloride with n-alkylamine
Choy, Jin-Ho ; Kim, Ha-Suck ; Ha, Young-Gu ; Kim, Chong-Hee ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 84~85
1,1,3,3-Tetramethylguanidinium Dichromate. A New Mild Reagent for the Oxidation of Alcohols
Kim, Sung-Gak ; Lhim, Dong-Chul ; Lee, Phil-Ho ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 86~87
A New Direct Esterification Method Using Di-2-pyridyl Sulfite As a New Coupling Agent
Kim, Sung-Gak ; Yi, Kyu-Yang ;
Bulletin of the Korean Chemical Society, volume 7, issue 1, 1986, Pages 87~88