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공액사슬로 연결된 이핵금속착체의 전자적 상호작용에 관한 연구
정민철,Chung, Min-Chul,Munetaka Akita 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.6
The cis-hex-3-ene-1,5-diynyl-bridged diiron compound 3, [(η$^{5}$ - $C_{5}$ M $e_{5}$ ) Fe(dppe)]$_2$($\mu$-C≡C-CH=CH-C≡C), have been prepared and characterized by cyclic voltammetry(CV), and electronic spectroscopy (UV-VIS and near-IR, NMR). From the results, compound 3 show two well resolved, single-electron, reversible oxidation waves by CV, and comproportionation constant(Kc) calculated from the CV data for compound 3. The Mixed-valence (MV) radical cation 3$^{+}$ show strong absorptions in the near IR, 1586 nm, and this band is more readily assigned as MV $\pi$-$\pi$ band of delocalized complex (Robin-Day Mixed-valence Class III), and the $H_{ab}$ , effective coupling parameter are most consistent with electronic delocalization.
Mg ( OEt ) 2 / THF / SiCl4 / TiCl4 촉매에 의한 에틸렌의 기상 중합 및 공중합
정민철,김일,김재하,최홍기,우성일 ( Min Chul Chung,Il Kim,Jae Ha Kim,Hong Ki Choi,Seong Ihl Woo ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.6
Homo- and co-polymerization of ethylene were carried out in both gas and slurry phases over Mg(OEt)₂/THF/SiCl₄/TiCl₄-AlEt₃ catalysts in the range of temperature 20-70℃ and pressure 2-10 psig. In gas phase polymerization, maximum activity was measured at the Al/Ti mole ratio of 377, and reaction rate dependence on AlEt₃ concentration could be explained with the Langmuir-Hinshelwood adsorption model. Even though maximum activities were obtained at the same temperature, 60℃ in both gas and slurry phases, overall activation energy was higher for the slurry phase(13 ㎉/㏖) than for the gas phase(4.7 ㎉/㏖) polymerization. The molecular weight behavior has been examined by measuring intrinsic viscosity. The molecular weight was increased as the ethylene pressure increased, and as the temperature and the concentration of AlEt₃ and hydrogen decreased. Using two different comonomers(propylene and butene-1), the copolymerization of ethylene was carried out. The intrinsic viscosity and the melt index were decreased as comonomer concentration increased, and the maximum activity was observed when the concentration of comonomer is about 20 ㏖%.
공업화학 , 촉매 / 반응공학 : 나노크기의 카르복실레이토 은 ( I ) 카벤 착체 화합물의 합성 및 특성
정민철(Min Chul Chung) 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.4
The complexes of(carboxylato) Ag(Ⅰ)(1,3,4,5-tetramethylimidazol-2-ylidenes)(complexes ??-??) were prepared by the reaction of silver carboxylates with 1,3,4,5-tetramethylimidazol-2-ylidenes as ligands. The products were characterized by ^1H/^13C-NMR, FT-IR, UV and elemental analysis. Especially comples ?? consisted of the monomeric units arranged on the same plane on the basis of the result for X-ray crystallographic analysis. The oxygen in carboxylates moiety is asymmetric with respect to silver atom. In the ^13C-NMR spectrum, the carbenenic carbon atom in the complexes is shifted upfield by ca. 34.5-39.7 ppm.
β - 디케토네이트 - 온 착체에 이미다졸 - 2 이리덴이 배위된 첨가 생성물의 합성 및 특성
정민철(Min Chul Chung) 한국공업화학회 2002 공업화학 Vol.13 No.5
은 착체 화합물들은 silver β-diketonates 착체와 imidazol-2-ylidenes 배위자와의 반응으로부터 합성되었다. 합성된 착체는 ^1H/^13C-NMR, FT-IR, UV, 원소분석을 통해 특성을 파악하였다. 특히 착체 1은 X-ray 결정구조해석을 통해 분자구조를 알 수가 있었다. 결정 데이터: C_22H_23AgN_2O_2: M_r=455.29, Triclinic, space group P-1, a=7.9671(11) Å, a = 106.800(15) deg, b = 11.625(2) Å, beta = 93.298(12) deg, c = 12.0479(18) Å, gamma = 105.815(12) deg, V = 1016.4(3) Å^3, Z,=2, D_c=1.488 g/㎤, R1=0.1941, wR2=0.2438 for 5614 reflections. 얻어진 착체 1의 구조는 단분자이지만 은 원자를 중심으로 두 배위자가 교대로 적충되어 있고, 은 원자와 은 원자간의 거리가 3.000 Å이다. 그리고 착체의 imidazol-2-ylidene 중 carbenenic 탄소원자의 화학이동은 배위되지 않는 imidazol-2-ylidene 보다 33.3∼38.3 ppm 정도 고자기장쪽으로 이동됨을 알 수가 있었다. The compounds (β-diketonates) Ag (imidazol-2-ylidenes) were prepared by the reaction of silver β-diketonates with imidazol-2-ylidenes as ligands. These species were characterized by ^1H/^13C-NMR, FT-IR, UV, elemental analysis. The complex 1 was structurally characterized by X-ray crystallography. Crystal data: C_22H_23AgN_2O_2: M_r=455.29, Triclinic, space group P-1, a=7.9671(11) Å, a = 106.800(15) deg, b = 11.625(2) Å, beta = 93.298(12) deg, c = 12.0479(18) Å, gamma = 105.815(12) deg, V = 1016.4(3) Å^3, Z,=2, D_c=1.488 g/㎤, R1=0.1941, wR2=0.2438 for 5614 reflections. The crystal packing structure in the complex 1 shows the stacked arrangement. The distance between two silver atoms is 3.000 Å. In the ^13C-NMR, the peaks of the carbenenic carbon atoms in the complexes are shifted upfield by ca. 33.3∼38.3 ppm.
Consumer Responses to Price Shocks of Wine Imports in Korea
정철(Chul Chung),정민철(Min-chirl Chung),김봉근(Bonggeun Kim) 서울대학교 경제연구소 2022 Seoul journal of economics Vol.35 No.1
The main purpose of the study is to develop a methodology that divides consumers’ responses to free trade agreements (FTAs) or commodity taxes into quantitative and qualitative margins, which cause exogenous price changes for certain specific goods. Unlike the usual method of using unit values as a proxy variable for market prices, the use of unit values as a dependent variable for consumers’ qualitative choice showed that qualitative responses to price changes exist, and their size is significant. The methodology of separating and estimating qualitative responses to income changes as in economic crises revealed that many of the existing income effects are qualitative responses. As a key result, the price elasticity of −1.178 estimated by the usual demand model based on a single commodity assumption was reduced to −0.712 for the quantitative margin only, and the qualitative margin was the remaining −0.466, which accounted for more than a third of the overall response. The significant degree of qualitative response estimates suggests that policy makers and researchers should consider qualitative response as an important factor when analyzing the effectiveness of FTAs, especially in consumption.