• Journal of the Korean Chemical Society
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• v.19 no.6
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• pp.414-419
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• 1975

The insoluble tungsten complexes with 8-hydroxy quinoline (oxine=Hox), aniline (A), and pyridine(Py) in several organic solvents have been synthesized. Using the different solvents with oxine, two different complexes have been synthesized in dichloromethane and dimethylformamide(DMF), respectively. Only one kind of complex has been synthesized with aniline in dichloromethane and with pyridine in acetone. The complexes may be formulated as $WCl_2(Hox)_2,\;[WO_2(Ox_2)],\;[WCl_3A_3],\;and\;[WO_2ClPy]$ by the results of elemental analysis, infrared spectral data, and thermogravimetric analysis.

• Korean Journal of Food Science and Technology
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• v.4 no.4
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• pp.239-244
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• 1972

Commercial edible soybean oil was introduced into plastic containers. Colorless transparent (control), red transparent, green transparent cellophane films and, also, colorless transparent cellophane films coated respectively with Cemedine C, Cemedine C containing 10% pyridine, benzophenone, and p-aminobenzoic acid were prepared, and the % transmittance of each film to lights at U.V. and visible regions were measured. The containers were covered with the films and irradiated simultaneously with direct sunlight for 4.5 hours daily. The peroxide values of the oils in the plastic containers were determined at regular intervals. The effects of the Alms on the PV development of the oils were compared with that of the control, i.e., the colorless transparent films.The red and green films showed strong retarding effects ell the PV development. The red films showed a slightly stronger effect than the green ones. The colorless transparent films coated with Cemedine C showed an appreciable retarding effect. The films had absorbed the lights at the U.V. and visible regions considerably. The pyridine and benzophenone coated films lost their retarding effects after 10 and 4 days respectively. The p- aminobenzoic acid coated films showed a considerable retarding effect throughout the experimental period. The films had absorbed the lights strongly .As a whole, the retarding effects of the films on the PV development were, in decreasing order. as follows; Red> Green> p-Aminobenzoic acid coated > Cemedine Ccoated) Control > Pyridine coated > Benz ophenone coated

• Journal of the Korean Chemical Society
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• v.25 no.3
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• pp.177-182
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• 1981

Benzoylpyridinium and lutidinium salts containing$ [MoO(NCS)_5]^{2-}$ have been synthesized. The complexes have been characterized by spectroscopic, magnetic susceptibility and conductivity studies. Benzoylpyridinium and lutidinium oxopentaisothiocyanatomolybdates(Ⅴ) arise from d-d and charge transfer transitions. The magnetic moments of the complexes are close to the spin-only values. The complex anions are mononuclear containing N-bonded $NCS^-$ ligand.

• Journal of the Korean Chemical Society
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• v.26 no.6
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• pp.363-368
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• 1982

Ultraviolet spectrophotometric investigations were carried out on the systems of pyridine with iodine, iodine monobromide and iodine monochloride in carbon tetrachloride. The results reveal the formation of the one to one molecular complexes of the type, $C_5H_5N{\cdot}I_2$, $ C_5H_5$N{\cdot}IBr and $ C_5H_5N{\cdot}ICl$. Considering ${\lambda}_max$ according to the formation of charge transfer complexes has the blue shift with the increasing temperatures$25, 40, 60^{\circ}C$ the equilibrium constants K and molar absorptivities $\varepsilon$ of complexes were obtained. From these values, the thermodynamic parameters ${\Delta}H$, ${\Delta}G$ and ${\Delta}S$ for the formation of the above charge transfer complexes were obtained. These results indicate that the relative stabilities of iodine, iodine monobromide and iodine monochloride complexes with pyridine increase in the order, $ C_5H_5N{\cdot}I_2$ < $ C_5H_5N{\cdot}IBr$ <$ C_5H_5N{\cdot}ICl$. This may be a measure of relative acidity of halogen and interhalogen toward pyridine and can be explained by the polarizabilities of electron acceptors and the difference of electronegativities of halogen atoms.

• Journal of Environmental Health Sciences
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• v.29 no.2
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• pp.50-55
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• 2003

3,3-dichlorobenzidine is suspected to be cancinogenic in experimental animal and human. Several studies have investigated excretion of metabolites in urine, hemoglobin adduction and cancer incidence among workers occupationally exposed to 3,3'-dichlorobenzidine. In these researches, metabolites of 3,3'-dichlorobenzidine had a very important role, and were required as highly purity. The purpose of this study was synthesis and isolation of its metabolites from 3,3'-dichlorobenzidine. 3,3'-dichlorobenzidine was partially dissolved in benzene, ether, ethanol and methanol, and completely dissolved in 70% acetic acid on mixtures of citric acid containing less than 1% DCB, pyridine, a mixture of 0.5N NaOH and toluene(1:2), and phenol saturated with 20 mM TRIZA base. DCB, monoacetyl-DCB and diacetyl-DCB were measured by using gas chromatography/mass spectrometry(GC/MS). Detection for checking them was nitrogen phosphorous detection mode(NPD), and for identifying them was selected ion monitoring mode(SIM). The base peaks were 252 m/z in DCB, 252, and 294 m/z in monoacetyl-DCB, and 252, 294 and 336 m/z in diacetyl-DCB, respectively. Diacetyl-DCB was synthesized by titrating DCB solution of pyridine with sufficient acetyl chloride. Precipitation was diacetyl-DCB, which was purity of 98.7%. And its supernatant was composed of DCB, monoacetyl-DCB and diacetyl-DCB. By using acetic acid as controller of acetylation, monoacetyl-DCB was isolated from diacetyl-DCB . And residual pyridine was removed by using acetone. The purity of monoacetyl-DCB was 98.8%.

• KEPCO Journal on Electric Power and Energy
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• v.1 no.1
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• pp.169-174
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• 2015

In this research, pristine graphene was synthesized using methane ($CH_4$) gas, and N-doped graphene was synthesized using pyridine ($C_5H_5N$) liquid source by chemical vapor deposition (CVD) method. Basic optical properties of both pristine and N-doped graphene were investigated by Raman spectroscopy and XPS (X-ray photoemission spectroscopy), and electrical transport characteristics were estimated by current-voltage response of graphene channel as a function of gate voltages. Results for CVD grown pristine graphene from methane gas show that G-peak, 2D-peak and C1s-peak in Raman spectra and XPS. Charge neutral point (CNP; Dirac-point) appeared at about +4 V gate bias in electrical characterization. In the case of pyridine based CVD grown N-doped graphene, D-peak, G-peak, weak 2D-peak were observed in Raman spectra and C1s-peak and slight N1s-peak in XPS. CNP appeared at -96 V gate bias in electrical characterization. These result show successful control of the property of graphene artificially synthesized by CVD method.

• Journal of the Korean Chemical Society
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• v.19 no.4
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• pp.233-239
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• 1975

The configuration of two oxime groups in cis-2-butenedialdioxime, unsymmetrical compound conjugated by three double bonds, is determined by a NMR study on the effects of the solvent, temperature and concentration; it is certain that, in solutions of usual conditions, the configuration exists as only "syn-syn". And the relative strengths of the hydrogen bond between these oxime groups and several solvents are compared and somc effects of the temperature and concentration are also considered. The several models of hydrogen bond between oxime and solvents are proposed; especially it is to be noted here that the hydrogen bond in pyridine solvent is not resulted from the interaction between a lone electron pair on nitrogen atom of pyridine and the hydroxyl proton of oxime, but the result of $\pi$-complex formed between the $\pi$-orbital of pyridine and the hydroxyl proton of the solute.

• Proceedings of the Membrane Society of Korea Conference
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• 1996.04a
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• pp.38-39
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• 1996

우수한 산소선택 투과막 소재를 얻기 위하여 높은 산소투과계수를 보이는 짧은 실록산 사슬과 금속이온과 착체를 형성할 것으로 기대되는 피리딘 고리를 번갈아 가지는 폴리 아조메틴을 합성하여 얻어진 막의 산소투과성을 검토했다. 또 같은 방법으로 합성한 폴리아미드의 한소투과특성과의 비교도 시도하였다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2000.04a
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• pp.340-341
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• 2000

환경부에서 규제하고 있는 악취규제물질 중 자극적이며 화장실에서 나는 냄새와 유사한 성격을 가진 암모니아는 식품 및 화학공장 둥의 산업시설은 물론 환경기초시설, 대규모 농수산시장 등에서 발생하여 생활환경에서 빈번하게 감지할 수 있는 대표적인 악취유발물질의 하나이다. 이러한 암모니아를 분석할 수 있는 방법은 피리딘-피라졸론법, 네슬러법, 인도페놀법, CG-FTD법 둥 여러 실험방법이 제안되고 있으나 공기를 강제적으로 흡입하여 붕산흡수액과 접촉시켜 암모니아를 채취하고, 발색시약과의 반응에 의해 생성되는 푸른색의 인도페놀을 측정하여 암모니아를 정량하는 인도페놀법이 가장 광범위하게 이용되고 있다. (중략)

• Journal of the Korean Chemical Society
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• v.62 no.4
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• pp.314-318
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• 2018