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呂煥鎭,金鎭憲 慶北大學校 師範大學 1987 敎育硏究誌 Vol.29 No.-
We must select the adequate teaching-learning contents to the step of learning development to learn material and energy, the fundamental concepts of modern chemistry and it is inevitable that teaching-learning contents should connect between curricula of elementary-secondary school. Therefore this study analyze the following items on chemistry sphere of science curricula in elementary-middle-high school. 1) The character of chemistry-education. 2) The objective. 3) The learning-contents in units and concept sphere. 4) The contents and inquiry process in experiments. The major findings of this study are drawn as follows: 1) The connection is considered in the character of chemistry education. 2) The connection is considered well in general objective and affective objective but badly in cognitive and psychomotar objective. 3) The connection of the unit in learning contents is considered well between elementary school and middle school but badly on the whole. The connection of the learning-contents is different according to concept sphere and the connection between middle school and high school is better than that between elementary school and middle school. 4) The mean ratios of elements in inquiry process is increased gradually acceding to the level of each degree-school but is relatively high in middle school.
有機및 無機發癌物質의 化學發癌性에 對한 分子軌道論的 硏究
呂煥鎭 慶北大學校 1981 論文集 Vol.31 No.-
The formation of a loosely bound molecular complex between chemical carcinogen and a cellular component was showned to be first step of Carcinogenesis. Assuming that some positions in the carcinogenic molecule play an important role in forming the molecular complex, the electron distribution of several organic precarcinogens and their metabolites was examined by means of HMO method. The results showed that the ability of accepting electrons at the two carbons of K-region and the atom of L-region in proximity of K-region increases with the proceeding of the metabolism that is in order of precarcinogen, proximate carcingen, ultimate carcinogen charged positively. Accordingly, the first step of Carcinogenesis is considered to be essential the formation of a positive ion as the result of metabolism. From this point of view, an attempt has been made to account for the carcinogenic activity of inorganic elements. It has been found as the result of comparison with experiments that a quantity named "excess polarizing strength" is qualified as good measure to predict the carcinogenic activity of inorganic elements. All elements which is above 0.22 in the value of "excess polarizing strength" have carcinogenic activity. The unified interpretation of the carcinogenicity of both organic compounds and inorganic elements may be possible on the assumption that the formation of molecular complex between a carcinogen and a cellular component is essential to the formation in the metabolism of positive ion in the body as an ultimate carcinogen.
여환진,여수동,이무상,배준웅,이우붕,이광필 경북대학교 과학교육연구소 1997 科學敎育硏究誌 Vol.21 No.-
Concept of energy is introduced in the teaching quantitative relating of chemical reactions. The relations between the kind of matter and its mass are clarified in terms of energy of in calorie involved in the reaction. The heat quantity and strength of chemical bond are also explained by a model. Such an approach is able to give students deeper understanding of quantitative relation existing in chemical reactions.
Metalloporphyrin의 Olefin Epoxidation과 분자궤도함수론적 고찰
여환진,신현천,Hwhan Jin Yeo,Hyun Chun Sin 대한화학회 1992 대한화학회지 Vol.36 No.4
여러 가지 치환기를 가지는 망간 포피린착물을 촉매로 사용하여 CH$_2$Cl$_2$ 용매하에서 styrene과 NaOCl간의 반응에 대한 수율을 구하였다. ortho 위치에 치환기를 가지는 망간 포피린 착물과 전자받게성의 치환기를 가지는 망간 포피린착물일 때 반응속도와 에폭사이드에 대한 선택성이 증가했다. 또한 망간 포피린착물에 축상 리간드로서 이미다졸을 도입할 때 반응속도와 에폭사이드에 대한 선택성이 증가했다. Michealis-Menten식을 이용한 반응속도론적 연구에 의하면 착물의 촉매능에 더 큰 영향을 주는 요소는 $K_m$ 임을 알았다. $K_m$ 값이 작을수록 더 큰 결합친화도를 가진다. 이론적인 연구로 EHMO계산에 의해 나온 결과와 실험에 의해 나온 결과는 좋은 일치를 보여주었다. Product yields were determined for the reaction of styrene with sodium hypochlorite (NaOCl) in CH$_2$Cl$_2$ with various substituted manganese porphyrin complexes as catalysts. In the presence of the electron withdrawing group and ortho-substituted manganese porphyrin complexes, reaction rate and epoxide selectivity are increased. Also reaction rate and epoxide selectivity are largely increased by the presence of imidazole which behaves as axial ligand of the manganese porphyrin complexes. By the kinetic study with Michealis-Menten equation, the factor significantly affected to catalytic ability is $K_m$ value. A large binding affinity consists with the low $K_m$. With theoretical analysis by EHMO calculation, the results are in good agreement with experimental data.
Co(Ⅱ)-porphyrin 착물과 중성 및 음이온 리간드 사이의 평형
呂煥鎭,李相協,林鍾完,趙二永,柳相薰 慶北大學校 1990 論文集 Vol.49 No.-
Axial ligation for the reaction of Co(p-OCH_3) TPP with various ligands was studied by spectrophotometric method. Equilibrium constants for the ligation reaction were determined from the electronic absorption spectra. For the equilibria of reaction between Co(p-OCH_3)TPP and polar solvents(DMF, DMSO, THF), the order of the equilibrium constant (k_1) are; DMSO>DMF>THF In the case of the ligands are unsaturated amines (Pyridine, Imidazole, Lutidine), ligand binding to Co(Ⅱ)-prophyrin may be associated not only with the donation of electrons from the ligand to the cobalt atom (σ-bonding) but also with the interaction of the d-orbitals of cobalt with π^*-orbital of the ligand(π-back bonding). The order of the coordination capability of the amine ligands was given by; Pyridine>Imidazole>Lutidine The equilibrium constants for anionic ligands were decreased with increasing dielectric constant of the solvent.