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Equatorial-Skew형 [Co(TRDTRA)($OH_2$)] 착물과 $CN^-, NO^{-}_{2}$ 그리고 $NCS^-$ 이온간의 치환반응
김동엽,조영재,이동진,오창언,도명기,Dong-Yeub Kim,Young-Jae Cho,Dong-Jin Lee,Chang-Eon Oh,Doh Myung-ki 대한화학회 1992 대한화학회지 Vol.36 No.3
Equatorial-Skew형 [Co(TRDTRA)($OH_2$)]착물과 $CN^-, NO^{-}_{2}$ 그리고 $NCS^-$ 이온 간의 치환반응 결과 생성된 착물의 치환반응성 및 구조를 전자흡수 스펙트럼과 Yamatera 이론에 따라 조사하였다. 속도록적 자료로부터 착물과 $CN^-, NO^{-}_{2}$ 그리고 $NCS^-$ 이온의 반응차수는 각각 1차이며 총괄 반응차수는 2차임을 알 수 있었다. $CN^-$ 및 $NO^{-}_{2}$ 이온에서 생성된 착물의 구조는 이성질화 반응이 동반된 Polar-Chair 형이며, $NCS^-$ 이온의 경우에는 이성질화 반응이 동반되지 않는 Equatorial-Skew 형임을 알 수 있었다. The substitution reaction and structrue of products obtained from the reaction of Equatorial-Skew-[Co(TRDTRA)($OH_2$)] (TRDTRA = trimethylenediaminetriacetate) with $CN^-, NO^{-}_{2}$ and $NCS^-$ ions have been investigated by means of electronic absorption spectroscopy and theoretical calculation based on the Yamatera's theory. According to kinetic data, the substitution reaction order for the complexes such as $CN^-, NO^{-}_{2}$ and $NCS^-$ was the first order, respectively, and overall reaction order was second order. It has been determined that the structure of products having $CN^{-} and NO^{-}_{2}$ ions was Polar-Chair type complexes which were accompanying with isomerization and having $NCS^-$ ion was Equatorial-Skew type complex which was not accompanying with isomerization.
The Effect of Environmental Regulation on the Productivity of Korean Steel Industry
김동엽,강신원,Kim, Dong-Yeub,Kang, Shin-Won 한국환경경제학회 2000 자원·환경경제연구 Vol.9 No.5
환경오염을 유발하는 산업에 대한 환경규제의 효과는 모순되는 두 가지 측면이 있다. 즉, 환경규제는 기업의 생산성 증가를 감소시킬 것이라는 생산성에 대한 부정적인 효과와 환경규제가 효율성 증대와 기술혁신을 유발시켜 생산성을 증가시킨다는 것이다. 최근 한국은 소득이 증가함에 따라 환경에 대한 인식이 점점 높아지고 있으나 철강산업의 생산성 증가율은 감소하고 있다. 이러한 경제구조에서 환경규제가 한국철강산업의 생산성에 어떠한 영향을 미치는지를 검증하고자 하였다. 본 연구는 1967년부터 1996년까지의 한국 철강산업의 시계열 자료를 사용하여 환경규제의 총요소생산성에 대한 직 간접적인 효과를 검증하였다. 검증결과 환경규제는 한국 철강산업의 총요소생산성 감소의 31~36%를 차지하는 것으로 나타났다.
N,N'-bis[2(S)-2-pyrrolidinylmethyl]phenylene-1,2-diamine를 배위하는 전이금속 착물의 합성 및 구조적 특성
김동엽(Dong-Yeub Kim) 한국산업융합학회 1998 한국산업융합학회 논문집 Vol.1 No.1
The SS-phpm·4HCl(N,N'-bis-[2(S)-pyrrolidinylmethyl]phenylene-l,2-diamine-4-Hy-drochloride) ligand having stereospecificity has been prepared and reaceted with trans-[Co(pyridine)₄Cl₂]Cl. The resultants are purple crystals, which are identified to be ??-cis-β-[Co(SS-phpm)Cl₂]Cl by elemental analysis and UV/Vis-and CD-absorption spectra, The confonnation of SS-phpm in ??-cis-β complex is δ ε λ (SSSS) for α Ich of the five-membered chelated ring. Futhermore, according to orientation of secondary amine, total strain energy on each isomers was calculated by molecular mechanics(MM) to verify structural characterization and spectral data As the result, the most stabilized isomer was ??-cis-β(SSSS). The value of total strain energy(U) of ??-cis-β(SSSS) isomer was 63.21 kcal/mol, respectively.<br/>
김동엽 ( Dong-yeub Kim ) 한국산업융합학회 2006 한국산업융합학회 논문집 Vol.9 No.1
In order to analyse the properties of the fiber-adhesive that was used as Flocking process we synthesized quaterpolymer with the variation of the types of monomer ratio by emulsion polymerization. We characterized the properties of this adhesive: Differential Scanning Calorimeter(DSC), Thermogravimetry Analysis(TGA), Raman spectroscopy. The polymer was synthesized by changing the using amount of 2-EHAM, and then we investigated the characteristics of glass transition temperature(Tg), melting temperature(Tm), thermal stability and hydroxyl group respectively. The optimum monomer composition was 36.84% EAM, 15.79% MAM, 42.1% 2-EHAM and 5.26% AAc.
김동엽(Dong-Yeub Kim),정맹준(Maeng-Joon Jung),이철재(Chul-Jae Lee) 한국산업융합학회 2012 한국산업융합학회 논문집 Vol.15 No.2
Melatonin has been studied as a potential treatment of cancer, immune disorders, cardiovascular diseases, depression, seasonal affective disorder (SAD), circadian rhythm sleep disorders, sexual dysfunction and some forms of insomnia. Prolonged release melatonin has shown good results in treating insomnia in older adults. It may ameliorate circadian misalignment and SAD. Basic research indicates that melatonin may play a significant role in modulating the effects of drugs of abuse such as cocaine. A 2004 review found that melatonin significantly increased total sleep time in people suffering from sleep restriction. Therefore, in this study, in order to explain characteristics of melatonin, total energy, net charge, vibrational mode of melatonin are calculated by PM3 methods of HyperCam 6.0.
SS-epm이 배위된 trans-dichlorocobalt(Ⅲ) 착물과 라세미 propane-1,2-diamine과의 입체선택적 리간드 치환반응
김동엽(Dong-Yeub Kim) 한국산업융합학회 2000 한국산업융합학회 논문집 Vol.3 No.1
The stereoselective ligand exchange reaction of trans[Co(SS- epm)Cl₂]+ and racemic propane-1,2-diamine (rac-pn) produces the complex that is identified as [CO(N)??]³+ type of [Co(SS-epm)(pn)]³+ by abso게tion spectrum. It is conceivable that the reaction mechanism involves substitution and isomerization. The calculated and experimentally determined ratios of the complexed enantiomeric substrates at equilibrium were as follows: [Co(SS-epm)(pn)]³+,calcd 32 % / 68 %, exptl 19 % / 81 % R-pn / S-pn. It has been shown that the employment of molecular mechanics calculations as a predictive tool may lead to the design of chiral complexes that may be applied to the separation of racemic mixtures of simple bidentate ligands.<br/>