Coumarin 유도체의 전기화학적 분석

김일광,한현호 圓光大學校 基礎自然科學硏究所 1989 基礎科學硏究誌 Vol.8 No.1

The extract and a electrochelnical analysis for coumarin and 7-acetoxy-4-(bromomethyl) coumarinin serum have been investigated. The simultaneous analysis of coumarin and 7-acetoxy-4-(bromomethyl) coumarin by differential pulse polarographic method was conducted using 0.1M tetraethyl ammonium perchlorate supporting electrolyte and Ag-AgCl reference electrode in acetonitrile after extractionon C_18 Sep-Pak columm. The cathodic halfwave potential for coumarin and 7-acetoxy-4-(bromomethyl) coumarin were about -1.63vo1ts and -0.36vo1ts respectively. The recoveries for coumarin and7-acetoxy-4-(bromoethyl) coumarin on C_18 Sep-Pak column with acetonitrile were more than92% in serum.

[화학] 폴리(에테르)사슬이 결합된 Cobalt(Ⅱ)bipyridine 착물의 합성과 전기화학적 성질

김일광(Il Kwang Kim),전일철(Il Chul Jun),Royce W. Murray 한국분석과학회 1996 분석과학 Vol.9 No.3

항갑상선 물질(2-mercapto-1-mathyl-imidazole : MMI)의 전기화학적 분석 : 2-mercapto-1-mathyl-imidazole : MMI

金日光,千賢子 圓光大學校 基礎自然科學硏究所 1994 基礎科學硏究誌 Vol.13 No.2

The determination of 2-mercapto-1-methyl-imidazole (MMI) in 5.0×10exp(-2)M lithium perchlorate solution has been investigated by the differential pulse polarography. The optimum condition in determination of MMI was as fellows: -0.9 volts initial potential, 0.08㎷ pulse height, 2㎷/sec scan rate, and medium mercury drop size. Calibration curve has shown a good linearlity in the range of 1.0×10 exp (-7)M to 8.0×10exp (-5)M and the detection limit has been 2.2×10exp (-9)M. This method has been applicable for the determination of MMI in thyroid drug without interference of addtives.

Acetonitrile 용액중에서 살충제 O, O-Dimethyl-O-(3-Methyl-4-Nitrophenyl)-Phosphorothioate (Fenitrothion)의 전기화학적 환원

金日光,金潤根,千賢子 圓光大學校 基礎自然科學硏究所 1989 基礎科學硏究誌 Vol.8 No.3

계민활성 micelle을 형성하는 acetonitrile 용액에서 O,O-dimethyl-O-(3-methyl-4-nitrophenyl)-phosphorothioat(Fenitrothion)의 전기화학적 환원을 direct current 및 differential pulasepolarography, cyclic voltammetry 그리고 controlled potential coulometry 방법으로 연구하였다. Fenitrothion의 환원 과정은 1단계로 4 전자 이동에 의한 부분 가역적 전자이동 화학반응 (EC, EC)기구로 O,O-dimethyl-O-(3-metbyl-4-hydroxyaminophenyl)-Phosphorothioate를 형성하고, 더 높은 음전위에서 2 전자 이동에 따른 양성자 반응으로 phosphorus 원자와 phenoxy group의 단일 결합이끊어지면서 주생성물인 P-amino-m-cresol과 dimethyl thiophosphinic acid를 생성하였다. Sodiumlauryl sulfate micelle 용액에서 polarography 환원파는 전체적으로 억제 되었으며 특히 1차 환원파는 음이온 micelle의 선택적 작용으로 2단계로 분리되었다. The electrochemical reduction of O,O-dimethyl-O-(3-methyl-4-nitropheny1)-phos-phorothioate(Fenitrothion) has been studied in acetonitrile solution containing surfactant micelleby direct current (DC)-differential pulse (DP) polarography, cyclic voltammetry (CV) and controlled potential coulometry (CPC). The partially reversible clectron transfer-chemical reaction(EC,EC mechanism) of fenitrothion reduction proceeded by four electron transfer to form O.0-dimethyl-O-(3-methyl-4-hydroxyaminophenyl)-phosphorothioate which undergoes sing1e bond of the phosphorus atom and phenoxy group cleaves to give p-amino-m-cresol and dimethyl thiophosphinic acid as major product by two electron transfer-protonation at higher negative potential. The polarograpic reduction waves shown to suppressed due to inhibitory effect of sodium lauryl sulfate micelle solution and split up on selectivity of anionic micelle effect in two step at the first reduction peak.

미셀-알콜수용액에서 Nitrobenzyl chloride의 전기화학적 환원

金日光,오해범 圓光大學校 基礎自然科學硏究所 1983 基礎科學硏究誌 Vol.2 No.1

The electrochemical reduction of nitrobenzyl chlorides in micelle-ethanol solution has been examined by polarography. The polarographic half-wave potential of nitrobenzy1 chlorides shown to be more negative shift in the anionic micelle(NaLS). o, p-nitrobenzy1 chlorides are initially an one-electron process which give the corresponding anion radical and the anion radical is rapidly decomposed to give the neutral radical. Those neutral radical dimerises as a major product although some o,p-nitrotoluene is also produced by hydrogen atom abstraction from the solvent. But m-nitrobenzy1 radical produced only m-nitrotoluene because of its steric effect.

3-Phenyl-4-nitrosydnone의 전기화학적 연구

金日光,金潤根 圓光大學校 基礎自然科學硏究所 1986 基礎科學硏究誌 Vol.5 No.2

An electrochemical reduction on the 3-phenyl-4-nitrosydnone in acetonitrile solution has been studied by direct current differential pulse polarography, cyclic voltammetry and controlled potential coulometry. Before the cleavage of phengl-N single bond a reversible electron transferchemical reaction (EC) mechanism of nitro functional group proceeded to form amino (orhydroxylamino) group by multielectron transfer which is followed to give phenyl glycine (or phenyl hydrazine) by single electron transfer-chemical reaction at the 2nd and 3rd irreversible reduction wave of high negative potential region. The cathodic half-wave potentials shown to be negative shift due to inhibition effect of cetyl-trimethyl ammonium bromide micelle while the sodium lauryl sulfate micelle showed reversible anodic peaks on the 2nd, 3rd reduction waves at high negative potential region.

인사말

김일광 한국분석과학회 2008 분석과학 Vol.21 No.1

물과 Micelle용액에서 Benzaldenhyde의 전기화학적 환원에 관한 연구

金日光,金潤根 圓光大學校大學院 1988 論文集 Vol.2 No.-

The electrochemical reduction of benzaldehyde in 10% ethanol-water solution contained surfactants has been studied by direct current (DC) differential pulse(DP) polarography, cyclic voltammetry (CV) and controlled potential coulometry(CPC). A totally irreversible electrode reaction processes of benzaldehyde reduction proceeded by one elecron transfer to form anion radical which undergoes both protonation and a second one electron reductio to give benzyl alcohol as a major product. The cathodic reduction wave was seperated by inhibition of sodium lauryl sulfate due to selectivity and effect of anionic charged micelle. The possible reduction mechanism with controlled pH range was suggested.

수은-EDTA착물을 이용한 일정 전류 전기량 적정법

김일광 광주보건대학 1978 論文集 Vol.4 No.-

A method for the constant current coulometric mercury-EDTA titrations has been examined. This method was useful for determination of radio chemical species by remote control. The principle is based upon the determination of various metal ions by the indirect electrical generation of ethylene diamine tetra acetic acid released upon reduction of mercury-EDTA chelate at platinum electrode. The effects of pH, buffer, chelon and metal ions on the potentiometric titration curve has been studied by means of potential-pH diagram. Potential-pH diagrams allow a prediction of the extent of the end point break and thus a choice for optimal titration conditions. The use of complex stability constant under controlled pH conditions made possible the potentiometric titration of multicomponent mixture.

수용액에서 연료용 수소를 얻기 위한 MgFe_2O_4 광반도성 전극의 제조와 특성에 대하여

김일광,이홍,최창진,김윤근,천현자 圓光大學校 基礎自然科學硏究所 1987 基礎科學硏究誌 Vol.6 No.2

In the light of the rarity of p-type semiconducting oxides and the unusual properties of the magnesium-iron-oxygen system, it is worthwhile to examine the solied state and photoelectrochemical properties of these materials more closely. This work presented an investigation of the preparation and characterization of magnesium-substituted ironoxid ceramics. Sintered discs of magnesium substituted ironoxides were prepared by conventional powder state mixing techniques. X-ray diffraction and scanning electron microscopy experiments showed that these materials are multiphase, containing both MgFe_2O_4 corundum phase and a spinel phase. More important, photoelectrochemical experiments using the ceramic discs as photoelectrodes showed both cathodic photocurrents and anodic photocurrents under illumination. Photochemical and electrochemcal techniques have been used to show that the inhomogeneities of these materials in the near surface region may be related to the photoelectrochemical properties of the magnesium substituted ironoxide bi-type photoelectrodes.