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메탄올중 치환 2-Phenylethyl Benzenesulfonates와 1,4-Diazabicyclo[2.2.2]octane의 반응속도에 미치는 이탈기효과
한광래,서혁춘,이국행 全北大學校 科學敎育硏究所 1988 과학과 과학교육 논문지 Vol.13 No.-
Leaving group effects for the reaction of substituted 2-phenylethyl benzenesulfonates with 1,4-diazabicyclo[2.2.2]octane were studied conductometrically in methanol at 44.5℃ and 54.5℃ The rate constants were calculated by Guggenheim equation and activation ther-modynamic parameters were also evaluated. The rates of reaction were increased with electron donating ability of substituent in substrate and with electron withdrawing ability of substituent in leaving group. The isokinetic relationship between △H^≠vs.△S^≠ was well correlated and this reaction is entropy controlled. The Hammett plots were correlated with good linearity and the value ρz is 0.96. From the activation parameters and the Hammett relationship, this reaction was. found dissociative S_N2 mechanism.
A Study on the B-Cl Symmetric Stretching Vibration-Rotation Spectra of Gaseous HBCl_2 Molecule
Yoo, Hean Jung,Han, Gwang Lae,Lee, Kuk Haeng,Suh, Hyoack Choon 全北大學校 科學敎育硏究所 1989 과학과 과학교육 논문지 Vol.14 No.-
TEA CO_2레이저를 이용하여 BCl_3와 H_2/D_2 기체로부터 HBCl_2를 합성한 후 분해능 0.12㎝^-1의 FT―IR 스펙트럼을 얻었다. B―Cl대칭 뻗침 v_2의 진동―회전값을 얻었으며 H^11BCl_2, D^11BCl_2 및 D^10BCl_2의 기본진동은 각각 734.62, 709.08와 723.15㎝^-1이었다. DBCl_2 분자의 v_1과 2v_s에 대한 Fermi resonance의 기본진동은 1911.05㎝^-1이었다. 바닥상태때의 회전상수값을 마이크로웨이브값과 비교하였으며, 아울러 P. R가지 모양은 전형적인 B형태임을 보여줬다.
食品배합에 의한 Ascorbic Acid(還元型 Vitamin C)의 효능 보존에 관한 연구
신정숙,김순희,한광래,이국행 全北大學校 科學敎育硏究所 1996 과학과 과학교육 논문지 Vol.21 No.-
This study intended to search for the effective mixing method of vegetables. food additives, the material of storage containner. that the capability of Ascorbic acid in vegetables, as antioxidants, can be preserved. Orange contained is the highest percentage of Ascprbic acid among vegetables, as followed by. korean radish, cacumber. carrot, garlic. In 30 min ofter tht time, the decreasing ratio of Ascorbic acid for vegetables ifself. is the largest for cacumber, as followed by. carrot, amber, korean radish, cabage, orange and garlic. In 30 minutes after storing the juice of korean radish in container, the order of the decreasing rate for the material of container is bioceramic <clay = aluminum <beaker = stainless. From this study, we know that garlic as the mixed vegetables is most effective, bioceramic as the material of storage container, the weak acidity as the condition of storage, for the conservation of Ascorbic acid in vegetables.