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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.
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.
Co(Ⅱ)$(dimethyl bipyridine)_3(ClO_4)_2$의 전기화학적 성질과 산소환원에 대한 전극 촉매 효과
김일광,박종술,한완수,김윤근,전일철,Kim, Il Kwang,Park, Chong Sool,Han, Wan Soo,Kim, Youn Keun,Jeon, Il Cheol 대한화학회 1997 대한화학회지 Vol.41 No.8
Co$(dimethyl bipyridine)_3(ClO_4)_2$의 확산계수$(D_0)$와 전극반응속도상수$(K_0)$를 순환전압전류법과 대시간전류법으로 구하였다. 확산계수에 대한 용매, 농도, 주사속도 등의 영향과 반응속도상수에 대한 온도변화의 영향을 조사하였다. 25$^{\circ}C$에서 확산계수는 $5.54{\times}10^{-6 }cm^2/sec$이었고, 반응속도상수는 $2.39{\times}10^{-3 }/s$ 이었으며, 용매의 점도가 커질수록 봉우리전류값과 확산계수는 감소하였다. 반응속도상수에 대한 온도의 영향으로부터, ${\Delta}G^{\neq},\;{\Delta}H^{\neq},\;{\Delta}S$ 등의 열역학적 파라미터를 구하였다. 이 화합물은 $O_2$분자의 환원에서 봉우리전류를 크게 증가시키고, 환원전위를 양(+)전위방향으로 이동시키는 열역학적 전극촉매현상을 보였다. Diffusion Coefficient$(D_0)$ and electrode reaction rate Constant$(K_0)$ of Co$(dimethyl bipyridine)_3(ClO_4)_2$ were determined by cyclic voltammetry and chronoamperometry. It was also investigated that the effects of solvent, concentration, and scan rate, etc. on the diffusion coefficient and the temperature effect on the rate constant. The peak currents and diffusion coefficients were dcreased as increasing the viscosity of solvent. Diffusion coefficient was $5.54{\times}10^{-6 }cm^2/sec$ and the reaction rate constant was $2.39{\times}10^{-3 }/s$ at 25$^{\circ}C$. The thermodynamic parameters such as ${\Delta}G^{\neq},\;{\Delta}H^{\neq},\;and\;{\Delta}S$ were calculated from plotting the reaction rate constants versus the solution temperatures. This compound was shown the catalytic effect on the oxygen reduction that the reduction peak current of oxygen was greatly enhanced and the peak potential was shifted to +0.2 volt.
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.
Synthesis of Some Bis(bipyridyl) Ligands Linked to Phenyl Groups
Chang, Wonghil,Park, Sunkyeong,Jeon, Il Cheol 전주대학교 자연과학종합연구소 1997 전주대학교 자연과학연구소 학술논문집 Vol.10 No.2
In order to investigate the utilization of photochemically and electrochemically active metal-bipyridyl complexes bridged with xylene group, some bis(bipyridyl)ligands are prepared. The ligand, o-bis(4'-methyl-(2,2'-bipyridyl))-4-ethyl)benzene (oxdbp), was synthesized from the reaction of the anion of 4,4'-dimethyl-2,2'-bipyridyl with o-α,α'-dibromoxylene. m-Derivative (mxdbp) and p-derivative (pxdbp) were also synthesized from m-α,α'dibromoxylene and p-α, α'-dibromoxylene, respectively.
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
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.