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Structural Study of Fe^3+ - SCN^- Complex in ether.Ⅰ.
Jeon, Il-Cheol 全北大學校 基礎科學硏究所 1987 基礎科學 Vol.10 No.1
에테르 용매속에서 철(Ⅲ)과 티오시안 이온과의 착물의 구조에 대해 연구하였다. 이 착물은 철(Ⅲ)과 티오시안 이온이 산화반응하여 분해되므로 착물형성 즉시 분석하였다. 에테르속에서 철은 티오시안 이온과 1 : 4의 착물을 형성함을 확인하였다. 적외선 분광 스펙트럼의 결과로부터 4개의 티오시안 이온은 모두 동등하므로 이것으로부터 착물의 구조를 예측하였다.
Silver adduct of isothiocyanatocobalt(Ⅲ) complexes
Jeon, Il-Cheol 全北大學校 基礎科學硏究所 1986 基礎科學 Vol.9 No.1
이소티오시아나토코발트 (Ⅲ) 착물과 은 이온의 반응을 연구하였다. 이소티오시아나토 리간드 2개와 온 이온 1개가 반응하여 안정한 첨가물을 형성하였다. 원소 분석 결과와 적외선 스펙트럼의 이동으로부터 형성된 첨가물은, 착물 중 이소티오시아니토 리간드의 수에 따라 사슬을 형성하거나 고리구조가 됨을 알았다. 특히 트란스-디이소티오시아니토비스(에틸렌디아민) 코발트(Ⅲ) 착물의 첨가물은 물에 대한 용해도가 낮은 사실로 미루어 사슬이 상당히 길 것으로 예상된다.
자기 집합 단분자막 개질 금 전극을 이용한 수용액 중 폴리피를 성장에 관한 In-situ EQCM 연구
서경자,전일철,Seo, Kyoung--Ja,Jeon, Il-Cheol 한국전기화학회 2002 한국전기화학회지 Vol.5 No.3
Self-assembled monolayer(SAM)로 변형된 금 전극 위로 폴리피롤의 전기화학적 석출 과정을 수용액 상태에서 in-situ EQCM (Electrochemical Quartz Crystal Microbalance)과 ex-situ AFM (Atomic Force Microscopy)을 이용하여 조사하였다. 금 전극에서 cyclic voltammetry로 살펴본 폴리머의 석출은 산화 제한 전위 (anodic limiting potential) 값에 매우 의존적이었으며 주사 횟수에는 의존하지 않았다. 제한 산화 전위가 0.8V (vs Ag | ArCl) 이상일 때 폴리머의 석출은 크게 증가하였다. 그리고 주사 횟수가 증가하면서 질량의 비이상적 변화가 관찰되었는데 이것은 폴리피롤 필름의 rearrangement가 원인이라고 생각된다. 1-dodecanethiol SAM 전극과 thiophene SAM전극에서는 폴리머가 3차원적으로 성장하며 필름의 rearrangement를 수반하였지만 BPUS $(Bis(\omega(N-pyrrolyl)-n-undecyl)disulfide)$ SAM 전극에서는 2차원적인 layer-by-layer 성장을 하고 필름의 rearrangement는 관찰되지 않았다. 폴리머가 급격하게 전극 면으로 석출되면 사슬 모양과 도너츠 모양의 폴리머를 만들며, 정류 상태에 이르면서 주름잡힌 폴리머 필름이 생성되는 것이 원자 힘 현미경 (Atomic Force Microscopy) 이미지로 관찰되었다. The growth of Polypyrrole film has been investigated during electropolymerization in an aqueous solution on bare and SAM modified gold electrodes by in-situ EQCM and ex-situ AFM. According to the result of cyclic voltammetry measurements, in the case of a bare gold electrode, the electrochemical deposition of polypyrrole were dependent on the limiting oxidative potential, but not on scan numbers. When the limiting potential higher than 0.8 V was applied on the electrode, the amount of polypyrrole deposited on a gold electrode was rapidly increased and the abnormal mass change attributed to the rearrangement of polypyrrole films was observed as the scan number increased. The polypyrrole film Prepared on electrodes modified with 1-dodecanethiol SAM or thiophene SAM grew 3-dimensionally with the rearrangement of film. However, in the case of BPUS SAM, 2-dimensional layer-by-layer growth of film was observed without the rearrangement of film. AFM images showed films with chain-shaped and/ or donut-shaped polymers when grown rapidly and a wrinkled film at the steady state condition.
폴리(에테르)사슬이 결합된 Cobalt(II)bipyridine 착물의 합성과 전기화학적 성질
김일광,전일철,Kim, II Kwang,Jun, II Chul,Murray, Royce W. 한국분석과학회 1996 분석과학 Vol.9 No.3
The synthesis of poly(ether)tailed bipyridine complex as redox reaction probes has advanced attempts to interpret very slow diffusion and heterogeneous electron transfer. Diffusion coefficients as low as $1.5{\times}10^{-15}cm^2/s$ have been observed for the oxidation of neat $Co(bpy(ppgm)_2)_{3^-}(ClO_4)_2$ with $LiClO_4$ electrolyte. Heterogeneous electron transfer rate constants of materials were found to vary with diffusion coefficient. The decrease in k as the diffusion coefficient decreases was actually caused by the decreasing D. Diffusion coefficient for compound of strong ion pairing anion($ClO{_4}^-$) was much smaller than the diffusion coefficient for compound of weak ion pairing anion($CF_3COO^-$). 산화환원반응 탐침제로, poly ether 꼬리가 결합된 Cobalt(II)bipyridine 착물을 합성 하였고, 이들 화합물의 느린 확산계수와 불균일 전자이동을 설명하였다. $Co(bpy(ppgm)_2)_{3^-}(ClO_4)_2$에 전해질 $LiClO_4$가 혼합된 neat 상태의 산화반응에 대한 확산계수는 $1.5{\times}10^{-15}cm^2/s$ 였다. 이 화합물들의 불균일 전자이동 속도상수들은 확산계수와 관련이 있었다. 확산계수의 감소에 따라 속도상수(k)의 감소가 일어났다. 강한 이온쌍을 형성하는 $ClO{_4}^-$의 화합물은 약한 이온 쌍을 형성하는 $CF_3COO^-$ 화합물보다 확산계수가 훨씬 작았다.
Electrochemical Properties of Electroactive Monolayers Having $[Os(bpy)_3]^{2+}$ Moieties
방경숙,전일철,Bang, Gyeong Suk,Jeon, Il Cheol Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.3
Self-assembled monolayers (SAMs) of the alkylthiols with [Os(bpy)3]2+ moiety at the terminal position were prepared on gold electrode surface. Examination of the cyclic voltammograms for the SAM shows that it does not organiz e well unlike alkylthiols, which is attributed to the much larger diameter of [Os(bpy)3]2+ moiety compared with the cross-section of alkyl chains and the distance between the adsorption sites. Electromicrogravimetry study shows that the hydration numbers of the electrolyte were 16 $\pm2$, 11 $\pm1$, 5 $\pm$ 1 and 24 $\pm6$ for ClO4- , PF6-, NO3- , and SO42- , respectively. The binary SAMs of alkylthiols with [Os(bpy)3]2+ terminal-group were prepared by co-adsorption of alkylthiols as spacer molecules, which results in better packing in SAM and accordingly the stability was enhanced.
AFM을 이용한 수직배향막 폴리머 표면위의 액정배향에 관한 연구
김완철,송선애,전일철,이종문,이승희 한국전기전자재료학회 2003 전기전자재료학회논문지 Vol.16 No.6
We have studied the alignment of liquid crystals (LCs) on homeotropic polymeric surface that is scanned using an atomic force microscope (AFM) tip by optical polarizing microscopy and computer simulation. The scanned areas on one substrate are 5 $\mu\textrm{m}$ ${\times}$ 5 $\mu\textrm{m}$, 10 $\mu\textrm{m}$ ${\times}$ 10 $\mu\textrm{m}$, and 20 $\mu\textrm{m}$ ${\times}$ 20 $\mu\textrm{m}$ and this substrate is assembled to another substrate coated. with homeotropic polymer. The fabricated micro-LC cell using two substrates does not show any hysteresis and disclination lines inside the nano-rubbing areas, while changing voltage up and down. This indicates that the pretilt angle exists in the areas, thereby forming a hybrid LC configuration. From the experimental and computer simulation results, we can understand that the AFM rubbing clearly changes surface status of homeotropic alignment layer and causes the pretilt angle to an initial scanning direction.
Electrochemical Study of Some Bis(metal-trisbipyridyl) Complexes Bridged with Xylene Groups
Chang, Wonghil,Park, Sunkyeong,Jeon, Il Cheol 전주대학교 자연과학종합연구소 1997 전주대학교 자연과학연구소 학술논문집 Vol.10 No.2
It is known that metal-bipyridyl complexes shows photochemically and electrochemically interesting properties. In order to investigate the intramolecular metal-metal interaction between metal-ligand complexes which was connected with a spacer group. Some bis(metal-trisbipyridyl) complexes bridged with xylene groups were prepared. The electrochemistry of these complexes was studied. Osmium complexes showed a peak near + 1.0 V vs. Ag/AgCl due to adsorption on glassy carbon electrode in CH_2Cl_2, whereas ruthenium complexes showed a peak at 1.3 V. The adsorption on electrode was observed by frequency response of EQCM. Also, Cyclic Voltammetry of Nafion coating incorporated with [(Os(bpy)_2)_2(oxdby)]^4+ showed reduction-reoxidation waves in H_2SO_4 solution.
Electrochemical Study of Bis(Osmium-trisbipyridyl) Complexes Linked with Xylenes
Chang, Wonghil,Park, Sunkyeong,Jeon, Il Cheol 전주대학교 자연과학종합연구소 1998 전주대학교 자연과학연구소 학술논문집 Vol.11 No.1
In order to investigate the intramolecular metal-metal interaction between metal-ligand complexes which was connected with a spacer group The electrochemical property of bis(osmium-trisbipyridyl) complexe bridged with xylene groups were studied All osmium complexes linked with o-, m-, p-xylenes showed a peak near +1 0 V vs Ag/AgCl due to adsorption on glassy carbon electrode in CH_(2)Cl_(2). The adsorption on electrode was seemed to be diffusion-controlled by observation of frequency response in EQCM