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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Chemical Society
Journal Basic Information
Journal DOI :
Korean Chemical Society
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Volume & Issues
Volume 38, Issue 12 - Dec 1994
Volume 38, Issue 11 - Nov 1994
Volume 38, Issue 10 - Oct 1994
Volume 38, Issue 9 - Sep 1994
Volume 38, Issue 8 - Aug 1994
Volume 38, Issue 7 - Jul 1994
Volume 38, Issue 6 - Jun 1994
Volume 38, Issue 5 - May 1994
Volume 38, Issue 4 - Apr 1994
Volume 38, Issue 3 - Mar 1994
Volume 38, Issue 2 - Feb 1994
Volume 38, Issue 1 - Jan 1994
Selecting the target year
(T1 = Al, B and T2 = P, Si) Bridges on Metal-Substituted
Molecular Sieves : MNDO Calculations
Son, Man Sik ; Baek, U Hyeon ;
Journal of the Korean Chemical Society, volume 38, issue 1, 1994, Pages 1~7
Semiempirical MNDO calculations are employed to study ionicity of OH groups and stability in
= Al, B and
= P, Si) such as found in aluminophosphate family(
, BAPO-5, and SAPO-5) molecular sieves. Dimeric model clusters of Al-OH-P, B-OH-P and Al-OH-Si bridges were considered. It is shown that the elongation of the T-O bond, upon replacement of Al by B, occurs preferentially by a local deformation of the Al-O-P bridge. But the elongation of the T-O bond occurs preferentially by a rotation of Al-O-Si bridge upon substitution P for Si. Also, the ionicity of OH groups and stability increase in order to B-OH-P < Al-OH-P < Al-OH-Si bridge.
Theoretical Studies on the Photochemical Reaction of Psoralens (Ⅱ) Structure-Activity Studies on the Psoralen Photoadducts
Kim, Ja Hong ; Son, Seong Ho ; Yang, Gi Su ; Hong, Seong Wan ;
Journal of the Korean Chemical Society, volume 38, issue 1, 1994, Pages 8~12
The structure-activity studies are described for the photoreaction of naturally occuring psoralen with thymine. Thymine <> psoralen <> thymine photodiadducts from DNA is studied as a model for the charge transfer interaction by the semiempirical methods (PM3-CI-UHF, etc.). The relative structural activities of psoralen, and photoadducts are analyzed in terms of their differing abilities of psoralen and photoadducts are investigated both with regard to their abilities to complex and to intercalate with thymine base. The photoadducts were inferred to be a trans-anti Psoralen(3,4) <> Thymine(5,6) and cis-anti Thymine(5,6) <> (4',5')Psoralen(3,4) <> Thymine.
ESR 분광법에 의한 Anthraquinone 치환체의 음이온 라디칼에 대한 초미세 분리상수의 측정과 이론적 해석
Hong, Dae Il ; Kim, Gyeong Chan ; Kim, Chang Jin ; Lee, Gap Ryong ;
Journal of the Korean Chemical Society, volume 38, issue 1, 1994, Pages 13~20
Substituted anthrasemiquinone radical anions, which were formed by laser flash photoreduction of the substituted anthraquinone (1,4-DHAQ, 1,5-DHAQ, 1,8-DHAQ, 1,8-DCAQ), were studied by the electron spin resonance spectroscopy in the mixed solvents of the 2-propanol and the triethylamine. Hyperfine splitting constants (hfsc) were determined by simulating the ESR spectra. Extended Huckel Molecular Orbital (EHMO) calculations were performed to obtain
spin densities for these quinones. The hyperfine splitting constants could be assigned to specific protons on the basis of
Theoretical Study for the Substituent Effect on Proton Affinity of Imidazoles
Lee, Hyeon Mi ; Lee, Gap Ryong ;
Journal of the Korean Chemical Society, volume 38, issue 1, 1994, Pages 21~25
The proton affinities of substituted imidazoles, relevant to the binding of lexitropsins that contain imidazole ring to the base pair (G-C sequence) of minor groove of DNA, are studied with the aid of EHT calculations. It is shown that proton affinity of imidazole substituted at position
to the basic nitrogen is slightly larger than that of imidazole substituted at N for the methylimidazole. Proton affinities of N-substituted imidazoles are found to be larger than those of imidazoles substituted at position
for a selected set of the other derivatives. As predicted the proton affinity increases when electron-donating group is attached at position N of imidazole.
The Estimation of Standard Physisorption Isotherms based on the V-t Plots of Physisorption on Various Inorganic Adsorbents
An, Un Seon ; Jo, Hyeon U ; Lee, Gwang Sun ;
Journal of the Korean Chemical Society, volume 38, issue 1, 1994, Pages 26~33
Adsorption isotherms of nitrogen and argon on various adsorbents measured up to present by authors are used to make the V-t plots using various numerical and the analytical standard adsorption isotherms to estimate the appropriateness of these standard isotherms. It is confirmed that the analytical FHH equation is appropriate for wide range of adsorbents as a standard isotherm.
Optogalvanic Spectroscopy of U, Th and Rb using Diode Lasers
Lee, Sang Cheon ;
Journal of the Korean Chemical Society, volume 38, issue 1, 1994, Pages 34~40
First observation of uranium using a diode laser was published recently. The experiment was performed by the optogalvanic spectroscopy using diode lasers. A laser source causes the current change in a hollow cathode discharge lamp when metal atoms in plasma absorb the diode laser light. The optogalvanic signal is collected by detecting the current change. This work is the extended investigation of our previous research, the uranium detection using a diode laser. New electronic transitions of uranium and thorium in 775∼850 nm were investigated using diode lasers. In addition, the Rb(Ⅰ) optogalvanic spectra at 780.02 nm and 794.76 nm were studied. The Rb(Ⅰ) spectrum at 780.02 nm showed the isotopic features and hyperfine splittings. This work provides a key idea that the diode lasers are useful in the specrochemical analysis of the radioactive actinides that have a rich spectrum with transitions which can be easily reached with AlGaAs diode lasers. Also, this study shows that the diode lasers can be an important tool to find the spectroscopic parameters of actinides and rare earth elements which have not known.
Exchange Reaction Mechanism of
Macrocyclic Complexes by
Kim, Jeong ; Yun, Chang Ju ; Yu, Han Jun ; Kim, Geon ; Kim, Si Jung ;
Journal of the Korean Chemical Society, volume 38, issue 1, 1994, Pages 41~49
Exchange reaction mechanisms of the Pb(II) ion for the complexes between Pb(II) ion and nitrogen oxygen donor macrocyclic ligands, such as 1,13-diaza-3,4 :
, 1,15-diaza-3,4 :
, and 1,15-diaza-3,4 :
, were studied by
spectroscopy in N,N'-dimethylformamide(DMF) solutions. The associative-dissociative mechanism dominated in
system, the bimolecular exchange mechanism prevailed below
, and both bimolecular exchange and associative-dissociative mechanism dominated above
The order of activation energies for dissociation was $NtnOdienH_4\;<\;NtnOtnH_4\;<\;NenOdienH_4$ which was reverse to the order of stabilities.
Studies on Electrochemical Behavior of Some Light Lanthanide Ions in Nonaqueous Solution, Flow Injection Determination and Photochemical Characterization of Heavy Metal Ion Chelate Eight Coordinated Complexes. (Part 2)
Gang, Sam U ; Jang, Ju Hwan ; Kim, Il Gwang ; Han, Hong Seok ; Jo, Gwang Hui ;
Journal of the Korean Chemical Society, volume 38, issue 1, 1994, Pages 50~54
Spectrophotometric determination of some light lanthanide ions by flow injection method is described. Chromeazurol S forms water soluble complex with lanthanide ions in the presence of DTAB. The absorption maximum of the complexes are from 650 nm to 655 nm and the molar absorptivities were ca.
on Tris buffer (pH 10.5). The calibration curves for Nd(III), Eu(III) and Sm(III) obtained by FIA are over the range of 0.1 to 0.6 ppm and the correlation coefficient were ca. 0.9993. The detection limits (S/N) were from 10 ppb for Nd(III) and Eu(III) to 20 ppb for Sm(III). The relative standard deviations was
.2% for 0.4 ppm sample. The samples throughput was ca.
Electronic Structures of Unusual Silyltitanocene Complexes
An, Byeong Gak ; Gang, Seong Gwon ; Yun, Seok Seung ;
Journal of the Korean Chemical Society, volume 38, issue 1, 1994, Pages 55~60
Molecular orbital calculations at the extended Huckel level have been carried out for
(3) complexes which are important intermediates in organosilane polymerization. Stable geometry of complex 1 is not
, but Cs symmetry and the rotational energy barrier of
unit is computed to be 14 kcal/mol. The orbital interaction diagrams are studied to characterize the chemical bonding for the electron deficient systems, 2 and 3. It is possible for Si-H to be coordinated to the Ti metal using
Studies Towards Intramolecular Formal Iron-Catalyzed [4+2] Cycloaddition of Acetylenic Dienes
Byeon, Sang Yong ;
Journal of the Korean Chemical Society, volume 38, issue 1, 1994, Pages 61~68
The intramolecular formal iron-catalyzed [4+2] cycloaddition reaction of acetylenic dienes to produce bicyclic products has been investigated. These reactions proceeded, competing via intramolecular carbocyclization and bimolecular cycloaddition. However, the iron-catalyzed bicyclic carbocyclization of 4,4-dimethyl-3-(tert-butyldimethylsiloxy)-1-phenyl-6,8-decadien-1-yne(11) yielded exclusively bicyclic diene product(yield 78.1%). From this result, we found that the substrate containing a dimethyl substitutent at the 4,4-position helped to promote the intramolecular reaction, which is stable to the iron catalyzed conditions.
백서에서 Paraquat가 장기 Glutathione 농도에 미치는 영향
Go, Chun Nam ; Go, Chun Nam ; Yu, Ui Gyeong ;
Journal of the Korean Chemical Society, volume 38, issue 1, 1994, Pages 69~73
The effects of paraquat administration on glutathione was studied in rats. The contents of glutathione in the liver, kidney and lung were significantly decreased but the alteration was not significant in blood by paraquat administration. The decrease occured without concomitant increases in oxidized glutathione (GSSG) or in the GSH/GSSG ratio. The activities of γ-glutamylcysteine synthetase in liver and kidney were decreased by paraquat administration. And γ-glutamyl transpeptidase activities were significantly decreased in kidney and lung of paraquat treated-rats. These results suggest that the decreased synthesis of glutathione by paraquat were an important mechanism of the decreased level of glutathione in liver and kidney, and decreased glutathione transport was a factor on the changes of glutathione contents in lung.
Effects of Copper / Zinc-Containing Superoxide Dismutase (Cu, Zn-SOD) and Catalase on Paraquat-Induced Injury in Primary Cultured Rat Skin Fibroblast
Cha, Jong Hui ; Yu, Ui Gyeong ;
Journal of the Korean Chemical Society, volume 38, issue 1, 1994, Pages 74~79
The participation of superoxide in initiating tissue damage derived from xenobiotics is best illustrated by paraquat intoxication. In the present study, the roles of superoxide dismutase and catalase on paraquat-induced cell injury were investigated using primary cultured rat skin fibroblast. The degree of cell injury was assassed by the conversion of reduced MTT to a blue formazan. Paraquat produced concentration-and time-related cell injury in cultured rat skin fibroblast. Paraquat induced-cell injury was aggravated by pretreatment of aminotriazol (AT: 10 mM), an catalase inhibitor, and attenuated by addition of catalase (100∼500 unit/ml). However, the effects of diethyldithiocarbamate (DDC : 10 mM), copper- and zinc-containing superoxide dismutase (Cu, Zn-SOD) inhibitor, and Cu, Zn-SOD on paraquat-induced injury were not significant. These results suggest that hydrogen peroxide might be more responsible factor than superoxide in the pathogenesis of paraquat-induced cell injury.
Study for Total Synthesis of Bruceantin Analogue(Ⅰ)
Ju, Jeong Ho ; Choe, Jeong Jin ; Kim, Hong Beom ;
Journal of the Korean Chemical Society, volume 38, issue 1, 1994, Pages 80~86
The synthetic pathway of ethyl
-8-oxo-10-oxa-l'H-spiro[1, 3]dioxolane-4,4'-tricyclo [18.104.22.168 1,6]dodec-6-ene-9-carboxylate (7), an important intermediate for the total synthesis of bruceantin analogue, was developed. Ethyl 2-cyclohexanonecarboxylate and methyl vinyl ketone were employed as starting materials. Robinson annulation, allylic oxidation, regiospecific acylation and the formation of epoxy methano bridge ring were studied. 4,4a,5,6,7,8-Hexahydro-4a-hydroxy-2(3H)naphthalenone (14) was synthesized utilizing the unusual decarboethoxylation reaction discovered during ketalization of octalone (3).