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충격관내에서의 n-핵산-산소 혼합물의 점화지연에 관한 연구
박종회,최기영,윤석승,최성락 충남대학교 자연과학연구소 1984 忠南科學硏究誌 Vol.11 No.1
The ignition delay of n-hexane-oxygen mixture in a shock tube has been theoretically calculated adapting the ignition reaction model of the H_2-O_2 fuel system at pre-ignition step. It has been presumed that the reaction model for the oxidation of n-butane, which was proposed previously, would be safely applied for the oxidation of n-hexane.
Gadolinium-benzoate 착물의 열역학적, 적외선 및 자기적 성질에 관한 연구
金永仁,朴興才,崔星洛,尹錫丞 부산대학교 기초과학연구소 1992 부산대학교 기초과학연구소 연구논문집 Vol.12 No.-
수용액내에서 gadolinium-벤조산 착물형성 반응의 열역학적 함수값들을 이온상수 0.1M NaClO₄, 25℃ 조건하에서 구하였다. gadolinium-벤조산 착물의 안정도는 여분의 엔트로피 효과에 기인하는 것으로 판단되며, 벤조산 리간드의 경우 한 자리 리간드에 비해 높은 안정도 상수값을 나타내었다. 이러한 높은 안정도는 리간드내의 벤젠고리의 공액효과로 예측되었다. 합성된 Gd(ben)₃의 고채 IR 스펙트럼 결과, 벤조산 리간드가 두 자리 리간드로 작용하여 킬레이트를 형성하였으며, 80-300K 온도 범위에서의 자화율 데이터는 Curie-Weiss법칙에 잘 적용됨을 알 수 있었다. The thermodynamic parameters for the formation of gadolinium benzoate have been determined in the ionic medium of 0.1 M NaCl₄at 25℃ n aqueous solution. The thermodynamic results indicate that the complex is stabilized by the excess entropy effect caused by the dehydration of reacting ions. The especially high stability of Gd(Ⅲ)-benzoate compared to the monodentate ligand complexes might be ascribed to the conjugation effect of the benzene ring in the benzoate-ligand. IR Spectra show that benzoate anion acts as a bidentate ligand toward Gd^(3+) to form a chelate ring in solid state. Magnetic susceptibility data of the compound were also obtained and well described by Curie-Weiss law in the temperature range 80-300K.
Kinetics of Complexation of Alkali Earth Metal Ions with 18-Crown-6-Ether in Methanol
Yun, Sock Sung,Kim, Seong Heon,Yang, Joon-Mook,Choi, Ki Young 충남대학교 기초과학연구소 1989 연구논문집 Vol.9 No.-
The rates of complexation of the 18-C-6(1,4,7,10,13,16-hexaoxacyclooctadecane) with K^+, Ca^2+, Sr^2+, and Ba^2+ in methanol solution have been determined at 25℃ by a pressure-jump technique. The Eigen Winkler mechanism has been applied to interprete the kinetic data. The results suggest that the rate determining step of the complexation in methanol is the rearrangement of the ligand in the outer sphere ion-dipolespair to form a stable encapsulated complex of the metal ion by the crown ether.
Stability Constants of Some Lanthanide Anthranilates
Yun, Sock Sung,Kim, Inn Hoe 충남대학교 자연과학연구소 1981 忠南科學硏究誌 Vol.8 No.2
수용액에서 Lanthanide-Anthranilate (1:1) 착화합물의 안정도 상수를 전위차 적정법에 의해서 구하였다. 측정은 25℃와 이온강도가 1M NaClO_4인 용액에서 이루어졌다. 실험결과들을 다른 유사한 착화합물의 안정도 상수와 비교 검토 하므로서 Anthranilate의 Amino기가 결합에 관여하는 가를 고찰하여 보았다.
THE INTERACTION OF PIROXICAM WITH SOME METAL IONS IN AQUEOUS SOLUTION
YUN, SOCK SUNG,CHOI, HYOUNG NAE,KANG, JUN GILL,YOON, MINJOONG,CHOI, SUNG NAK 충남대학교 기초과학연구소 1989 연구논문집 Vol.9 No.-
The interaction of various metal ions, such as Co(Ⅱ), Cu(Ⅱ), La(Ⅲ), Ce(Ⅲ), Y(Ⅲ) and Al(Ⅲ), with piroxicam in aqueous solution has been studied by spectroscopic methods. The interaction of the metal lions with HMBDC (4-hydroxy-2-methyl-1,2λ-benzothiazine-1,1-dioxide-3-methyl-carboxylate) has also been studied for comparison. It was found that Al(Ⅲ) and Y(Ⅲ) ions interact significantly with both piroxicam and HMBDC to form 1:1 complexes in aqueous solution. The stability constants of the complexes have been determined at μ → 0. The thermodynamic parameters for the complex formations have also been calculated from the Gibbs-Helmholtz plot. On the basis of the spectroscopic and thermodynamic evidence, the binding sites of piroxicam and HMBDC to the metal ions are suggested.
Yun Sock Sung,Doh Jae-Bum,Choi Ki Young Korean Chemical Society 1992 Bulletin of the Korean Chemical Society Vol.13 No.6
The pressure-jump relaxation method has been used to determine the rate constants for the formation and dissociation of maganese(Ⅱ), cobalt(Ⅱ), and nickel(Ⅱ) with some dicarboxylates in aqueous solution at zero ionic strength. The carboxylate ligands used are 3-nitrophthalate, 4-nitrophthalate, and phenylmalonate. The activation parameters have alse been obtained from the temperature dependence of the rate constants. A dissociative interchange mechanism with a chelate ring closure step as rate determining is employed to interpret the kinetic data of manganese(Ⅱ) and cobalt(Ⅱ) complexes. The rates of formation of nickel(Ⅱ) complexes are controlled by both the solvent exchange step and the chelate ring closure step.
Sock-Sung Yun,Sung Kwon Kang*,Hong-Ryol Suh,Hyung-Sock Suh,Eun Kwang Lee,Jae-Kyung Kim,Chong-Hyeak Kim 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.8
The Ln(III) complexes with picrate ligand, [Sm(Pic)2(H2O)6]Pic•6H2O, 1, and [Ho(Pic)(H2O)7](Pic)2•3H2O, 2, have been synthesized and their crystal structures are analyzed by X-ray diffraction methods. Complex 1, crystallizes in the monoclinic P21/n space group and complex 2 in the triclinic P-1 space group. In complex 1, two picrate ligands coordinate to the Sm(III) ion, one of them in the bidentate fashion. There are one picrate anion and six water molecules in the crystal lattice. The nine-coordinated Sm(III) ion forms a slightly distorted tricapped trigonal prism. In complex 2, only one picrate ligand coordinates to the metal ion as a monodentate. There are two picrate anions and three water molecules in the crystal lattice. The eight-coordinated Ho(III) ion forms a distorted bicapped trigonal prism. Based on the results of the TG-DTG and DSC thermal analysis, it was analyzed that the lanthanide picrate complexes 1 and 2 are thermally decomposed in three distinctive stages, the dehydration, the picrate decomposition, and the formation of the metal oxide.
Kinetics of Complexation of Alkali Earth Metal Ions with 18-Crown-6-Ether in Methanol
Yun, Sock-Sung,Kim, Seong-Heon,Yang, Joon-Mook,Choi, Ki-Young Korean Chemical Society 1989 Bulletin of the Korean Chemical Society Vol.10 No.2
The rates of complexation of the 18-C-6 (1,4,7,10,13,16-hexaoxacyclooctadecane) with $K^+,\;Ca^{2+},\;Sr^{2+},\;and\;Ba^{2+}$ in methanol solution have been determined at 25$^{\circ}C$ by a pressure-jump technique. The Eigen Winkler mechanism has been applied to interprete the kinetic data. The results suggest that the rate determining step of the complexation in methanol is the rearrangement of the ligand in the outer sphere ion-dipole pair to form a stable encapsulated complex of the metal ion by the crown ether.
Luminescence Study on Some Terbium(III) Complexes in Water and Water-Ethanol Mixtures
Yun, Sock-Sung,Suh, In-Suck,Choi, Ki-Young,Park, Kyong-Kyun Korean Chemical Society 1985 Bulletin of the Korean Chemical Society Vol.6 No.1
The luminescence intensity of $Tb^{3+}$ bound to picolinic acid, squaric acid, and 2,3-pyrazinedicarboxylic acid has been studied in water and water-ethanol mixtures. It has been found that the emission intensity of $Tb^{3+}$ in the complexes is enhanced with the increase of ethanol content in water-ethanol mixtures. Several factors affecting on the emission intensity of $Tb^{3+}$ in waterethanol mixtures are discussed.