Silver Sulfide Halide 합성 및 물리적 성질에 관한 연구(Ⅰ)

정학진,김일두,박성규,정오진 조선대학교 기초과학연구소 1982 自然科學硏究 Vol.4 No.2

Ag_3SX (Ag_3SCl, Ag_3SBr and β-Ag_3SI) was synthesized by coprecipitation method according to the various reaction time and temperature. These synthetic compounds were identified by X-ray diffractometer (Rigakagu 4036 AI type) and the thermal properties of synthesized compounds were checked by Differential Thermal Analyser (Shimadzu DT-2B thpe). The electrical condcutivities of synthetic compounds were determined by Watanabe impedance bridge and another physical properties were discussed by melting point apparatus and the method of density. The reaction mechanism and formation heat of these synthetic compounds were discussed by X-ray peak intensities at various transition temperature. 1) The sysnthetic condition of compounds (Ag_3SCl, Ag_3SBr and β-Ag_3SI) used in the method of co-precipitation was at 290℃, 270℃ and 200℃ in heating temperature and over one hour in heating time, respectively. 2) The atomic distance of Ag-S and Ag-Ag are different according to the kinds of halide ions in the compounds. 3) The order of values on the X-ray peak intensity is Ag_SCl<Ag_3SBr<β-Ag_3SI, and these synthetic compounds have the ideal Antiperowski structures, 4) The stability of Ag_3SX complex is dependent upon halide ions and the order of stability is in the order of Ag_3SCl<Ag_3SBr<β-Ag_3SI. 5) The desity of Ag_SX crystal is 6.46-5.46 g/㎤ and the size of density is Ag_3SCl<Ag_3SBr<β-Ag_3SI. 6) The melting points of Ag_3SX crystals are similar to those of AgX compounds. 7) The electric conductivities of Ag_3SX crystals are increased with high ionic property of halide ions and electric conductivities of Ag_3SX crystals have 10^4 time as large as those of average in AgX, but activation energy is decreased. 8) If Ag_3SCl and Ag_3SBr were heated in N_2 stream, these compounds were decomposed into Ag_3S, AgCl and AgBr at about 416℃ and 429℃, respectively and these compounds have no transition temperature. 9) Silver sulfide idodide exists in two forms: β-Ag_3SI is stable up to 240℃, β-Ag_3SI was transformed into α-Ag_3SI over 240℃ and α-Ag_3SI was decomposed into Ag_2S and AgI at about 560℃. The transformation temperature of the modification are as follows, ◁본문참조▷ 10) The Δ^H。_(Ag_3SI) calculated from ratios of peak area on the D. T. A. curves, is about 1.306 kcal/mol.

Rare Earth Oxalate Hydrate의 構造變化에 關한 硏究(Ⅱ)

丁學鎭,丁梧鎭,宋基東 조선대학교 기초과학연구소 1984 自然科學硏究 Vol.7 No.1

희토류 옥살산 수화물 및 각 전이점 이후까지 가열하여 얻은 옥살산 시료들의 구조를 원소분석치, 시차열분석법, 열중량분석법, X선회절법 및 전자현미경법으로 연구하였다. 각 희토류는 옥살산 수화물 시료들은 공기중에서 293∼427℃ 사이에서 완전탈수 되어 단사정계 결정에서 무정형의 무수염으로 변한다. 이들 무수물은 346∼698℃ 사이에서 R_2O_2CO_3로 상변화가 생기며 720∼885℃에서 희토류 산화물로 분해된다. 각 희토류 옥살산 수화물의 전이온도와 희토류원소의 원자번호와는 아무런 관계가 없었다. The rare earth oxalate hydrates were synthesized by precipitation method at room temperature. These have the general formula, R_2(C_2O_4)_3. XH_2O. The structures of the hydrates and compounds ignited at each transition temperature have been investigated by analytical data of carbon and hydrogen, differential thermal analysis(DTA), thermogravimetric analysis (TGA) and X-ray diffraction method. The TGA results were similar to all the lanthanides and the DTA results were almost entirely different according to the heating conditions. The lanthanide hydrates lost water in air at the range of 200∼347℃ and monoclinic crystal became the stable anhydrous salt. These anhydrous salts were decomposed into R_2O_2CO_3 at the range of 380∼600℃. The rare earth oxycarbonates have begun to decompose into the rare earth oxide at 600∼885℃. We found that atomic numbers of rare earth elements were not related with each transitional temperatures.

Gas Chromatography에 依한 Steroids 및 Alkaloids의 分離

丁學鎭 朝鮮大學校 師範大學 1975 師大論文集 Vol.6 No.-

Separation and identification of some steroids and alkaloids of the morphine system were carried out by means of gas chromatography, and the instruments used are the Shimadzu gas Chromatograph Model GC-IC, equipped with a argon ionization detector and temperature programmer. The columns are U-shaped stainless steel of 1.865m×3mm packed on 80-100 mesh chromosord-w with 3% SE-30 silicon. Experimental data, i.e. gas chromatograms, retention time and discussion in this work are tabulated for some steroids and alkaloids of the morphie system.

師範大學 自然敎育系學科의 敎育課程 內容 檢討 및 改善에 關한 硏究

丁學鎭,姜宗煥,金一斗,朴相翊,崔熔燮,金順愛,林仁澤 조선대학교 교과교육연구소 1982 교과교육연구 Vol.5 No.-

Crown Ethers Thorium(Ⅳ) Nitrate Hydrate 착물에 관한 연구

정학진,서혁춘 조선대학교 기초과학연구소 1986 自然科學硏究 Vol.9 No.1

The hydrated thorium(Ⅳ) nitrate have been reacted with the crown ethers of the different cavity size in methanol and aceton solvent, respectively. The properties and structures of these complexes are discussed by the element analysis, Kahl-Fisher moisture titration, thermal analysis, X-ay diffraction, ultraviolet and infrared spectroscopy, and electric conductivity. All of the complexes and the nonaccordinated systems with the three, four and five molecules of the hydrates, and the mole ratio of metallic ion to crown ether ligands are 1:1. The structures of the all complexes are different in accordance with the kinds of solvents, but coordinating number and mole ratio are constant in all complexes. The molar absorptivity of the complex obtained in aceton solvent is increased by coordinated bonding of the thorium(Ⅳ) ion to the ligands because the coordinating power of molecule of aceton is larger than that of water. The hydrated thorium(Ⅳ) nitrate complexes with crown ethers have the structure of 1:4 electrolytes deduced from 466-479 ohm^-lcm M^-1. These complexes have been formed by the electrostatic attraction and it is found the hydrated thorium(Ⅳ) nitrate complex with 15-crown-5 ligand is the most stable because thorium(Ⅳ) ion is bonded inside of the ligands. Whereas the other complexes are bonded outside of the cavity of the crown ether because the size of thorium(Ⅳ) ion is smaller or larger than that of the other crown ethers.

MO이론에 의한 Diels-Alder 반응의 배향성과 반응성의 결정(Ⅰ)

丁學鎭,金一斗,朴聖珪 조선대학교 기초과학연구소 1985 自然科學硏究 Vol.8 No.1

This paper aims to predict the reactivity and the regioselectivity of Diels-Alder reactions of unsymmetical dienes and dienophiles. Frontier orbital theory has been applied to thermal Diels-Alder reaction by means of CNDO/2 and EHT-spd methods. The above reactions are normal electoron demand reaction and the major regioisomer is the para-substituents that is identical with experiments. Four-frontier orbitals and two-frontier orbitals' methods are identical with experimental major regioisomers. Sulfur is a much more polarizing substituent for the dienes than chlorine and cyanoradical. When sulfur is in diene, it shall dominate the regioselectivity. The coefficient polarization of substituted dienes and dienophiles is the same direction. We can predict the major regioisormer as para-substituents.

大學敎育改革에 관한 몇가지 提言

丁學鎭 조선대학교 교과교육연구소 1982 교과교육연구 Vol.5 No.-

요오드 이온을 포함한 단결정 고체 전해질의 전기 화학적 특성

정학진,김형윤,문원 조선대학교 기초과학연구소 1986 自然科學硏究 Vol.9 No.1

The electrochemical characteistics of all of tje single crystalline solids that would be used as the solid electrolytes were discussed with the apparatus made to measure the electric spfcific conductivity at various temperatures and with cyclovoltammograph, and measured data were treated by using computer program. It was calculated that the analytical experiment done by the application of A/D converter to the personal computer reduced the analytical error and enhanced the reproductivity by means of the developmental project of computer program. The electrical specific conductivities of Ag solid electrolytes Ag cell were 0.107~0.283 Ohm^-1 cm^-1 at 25℃, and these va1ues were higher than those of the Polycrystalline solids in the same diameter and weight of electrolytes and these values were proportional to temperature and the weight of solid electrolytes. Having measured the cyclovoltammogram of the solid electrolytes, the iodide ions contained in the single crystalline solids were transformed into the iodine and then oxidizing current was increased all at once at tile cathode. The free iodines which had been oxided in range of Ag electrode as cathode were again transformed into iodide ions at the anode and these anodic current appear as the state of reduction.

Computer Program에 의한 란탄계 선택성 막전극의 감응전위 측정

정학진,정오진,서혁춘,장동주 조선대학교 기초과학연구소 1985 自然科學硏究 Vol.8 No.1

Having made the selective membrane electrodes with lanthanide fluoride and lanthanide oxalate, the response potentials of 〔F^-〕 and 〔C_2O^2-_4〕 were measured with the selective membrane electrodes and the measured data were treated by using computer program. It was concluded that the analytical experiment done by the application of A/D converter to the personal computer reduced the analytical error and enhanced the reproductivity by means of the development project of computer program. The results were as follows: 1. When the additional ratio of matrixes is 0.1%, the response potentials of 0.1% matrixes were better than 0.3% in the response potentials. 2. The response values of the membrane electride mixed with silicon rubber as matrix is higher than those of the electrode mixed with PVC. 3. The response values of the membrane electrode with reference electrodes were better than that of membrane electrode with calomel electrodes and membrane electrodes. 4. Contrary to the calomel and membrane electrodes the denser concentration of the reference electrode, the less-the electric potential. 5. The response potentials of the insoluble membrane electrodes were inveresely proportional to the size of metallic ions. 6. The stability was the highest, as membrane eletrodes were in to the solution over 24 hours. 7. The response potential of La_2(C_2O_4)_3 and LaF_3 were stable between the range of pH 4.5∼8.0 and pH 3.5∼7.5 respectively.

N_3O_2형의 Dibenzoic Polyether Nitrogen과 Fe족 금속이온의 錯物에 關한 硏究(Ⅰ)

丁學鎭,丁梧鎭,曺正煥 조선대학교 기초과학연구소 1984 自然科學硏究 Vol.7 No.1

새로운 N_2O_3형 Dibenzonic Polyether Nitrogen을 합성하여 여러 비양자성 용매하에서〔Acetonitrile (AN), N, N-Dimethylformamide(DMF), Dimethylsulfoxide(DMSO) 및 Tetrahydrofuran(THF)와 Fe족 금속이온염과 합성한 Ligandrks의 착물생성에 따른 안정도 상수를 전기전도도법으로 구하고 착물생성으로 유발되는 음이온효과 용매효과 등을 UV-Spectrum으로부터 알아보았다. 그리고 비양자성 용매하에서의 전기전도도 자료로부터 착물이온들의 행동을 검토하였다. Dibenzonic Polyether Nitrogen (DBPN)의 구조는 원소분석과 IR-Spectrum 자료로부터 확인하였다. DBPN-CoCl_2DBPN-NiCl_2DBPN-Co(NO_3)_2 및 DBPN-Ni(NO_3)_2 착이온들의 비전도도를 Tokyo Electric Conductivitymeter에 의하여 25℃에서 측정하였다. 용매의 첨가량에 따라 Complex ion들의 당량전도도는 용매효과 금속양이온 및 음이온 등에 의하여 영향을 받는다. 특히 DBPN-metal(Co^2+, Ni^2+) Complex의 안정도상수 값은 AN>DMSO>THF 순이다. 일정 용매하에서 DBPN-metal(Co^2+, Ni^2+) 착물들의 안정도정수들은 Co^2+>Ni^2+와 Cl^->NO_3^-의 순으로 증가하였다. 이런 결과들로부터 DBPN-Ni과 Co의 착물들의 안정도정수는 DBPN의 동공 크기와 양이온크기의 상대적인 비에 의하여 크게 의존하였다. 그리고 비양자성 용매하에서 Complex ion들의 최대흡광 Peak는 핵전이 장파장이동 Peak를 보여준다. The ligand of the new Dibenzoic Polyether Nitrogen(DBPN) or the N_3O_2 type has been synthezised. The stability constants for the 1‥1 complexes of DBPN with cobalt and nickel in Acetonitrile, Dimethylsulfoxide, Tetrahydrofrane and and N, N-Dimethylforamide have been determined by electrical conductivitimeter and the effect of solvents, cations and anions indused from formation of complexes with DBPN ligand, have been discussed by the data of the UV-spectrum, and then the behaviors of these complexes ions have been discussed from the data of analysis of elements and IR-spectrum. The structures of DBPN are indentified from the data of analysis of elements and IR-spectrum. The specific conductances of the complexes with DBPN, chloride and nitrate salt of cobalt and nickel are measured Conductances at 25℃. The equivalent conductances are affected by the volume of organosolvents added, kinds of organosolvents, solvation, cations and anions, and the stability constants of complexes with Co^2+ and Ni^2+ are in the order of AN>DMSO>TMF>DMF, and the stability constants of these complexes are in the order of Co^2+>Ni^2+ and Cl^->NO_3^-, respectively. The stability constants of these complexes depends highly on relative ratio of cavity size of DBPN and cation size. The λ_max. of these complexes are shifted by solvents used and these complexes are also shifted in the direction of the long wavelength under the aprotic solvents.