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RISS 인기검색어
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- 저자 : 盧承宇 (검색결과 8 건)
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Me-OH속에서 치환아닐린과 염화메탄술포닐의 친핵성 반응의 속도론적 연구
盧承宇 忠州大學校 1982 한국교통대학교 논문집 Vol.15 No.2
Rates of reaction of methansulforny1 chloride with various substituted anilines have been measured in methanol. Substituent effects in aniline are found to be linearly correlated with pka (BrΦnsted relation with β=0.83) and Ρ=-2.45) respec tively. The results are interpreted in terms of degree of bond-formation at the transition state, which was found to have progressed relatieely further. The rates for o-methylaniline deviated from the BrΦnsted plot established by meta and para substituted aniline because of a steric effect of ortho position in aniline. Activation parameters, △H and △S have also been determined. The enthalpy of activation showed a regular variation in that electron donation substituents in the p-substituted aniline decrease △H and increase the negative value of △H
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盧承宇 忠州大學校 1998 한국교통대학교 논문집 Vol.33 No.2
The NMR chemical shift arising from 4d electron orbital angular momentum and 4d electron spin dipolar-nuclear spin angular momentum interactions for a 4d²system in a strong crystal field environment of octahedral symmetry has been investigated when the four fold axis is taken as the quantization axis. The NMR resualts are compared with the multipolar shift at various R-values and we find that the exact resualts are in agreement with the multipolar shift when R≥0.20nm. We also separate the NMR shift into the contribution of the 1/R5 and 1/R7 terms. It is found that the contribution of the 1/R5 term to the NMR shift is more dominant than the contribution of the 1/R7. Temperuture dependence analysis shows that the 1/T²term is the dominant contribution to the NMR shift for a 4d²system but the contribution of the 1/T term may not be negligible. The similar results are obtained for a 4d¹system from the temperature dependence analysis.
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6-Amino-5-〔(2-substituted-2-cyanovinyl)amino〕-1,3-dimethyluracil의 分子內環化反應에 關한 硏究
盧承宇 忠州大學校 1985 한국교통대학교 논문집 Vol.18 No.2
The intramolecular cyclization reactions of 4a and 4b have been studied. Hydrolysis of 4a and 4b afforded 12a and 12b, respectively. Treatment of 12a with POCI₃in DMF provided hygroscopic gum 16, a useful intemediate for the synthesis of 9-deazaxanthine derivatives. Compouand 16 was converted with alcohols, amines, and water to 19 b-e, 21b, c, and 19a, respectively. Oxidative cyclization of 1a, 1b, and 4b with ferric chloride gave 22a, 22b, and 26, respectively. Decarbalkoxylation of 26 gave 8-(cyanomethyl) theophylline (27).
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盧承宇 忠州大學校 1976 한국교통대학교 논문집 Vol.9 No.-
Quantitative determination of Cu(Ⅱ) has been studied by the colorimetry using Bis-salicyladehyde-ethylenediamine. (B. S. E.).The complex compound of Cu(Ⅱ)and B. S. E. shows a maximum absorption peak at 558mμ and B. S. E. dissolved in water shows a maximum peak 371mμ The mole ratio 1:1 in the reaction of Cu(Ⅱ) and B. S. E. has been confirmed through the mole ratio method. It is observed that Lambert-Beer'S law holds when Cu(Ⅱ) present in the range of 10??~10?? M/ℓat 558mμin the presence of Sodium tungstate and Sodium molybdate. Cu (Ⅱ) has been determined within-0.095% of mean relative error.
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Methanol, N,N-Dimethylformamide 및 Acetonitrils 속에서 2염기성 카르복시산의 해리상수에 관하여
盧承宇 忠州大學校 1978 한국교통대학교 논문집 Vol.11 No.2
The dissociation constants of dibasic carboxylic acid 〔HOOC(CH₂)n COOH,n=0∼4〕in methanol, N,N-dimethylformamide and acetonitrile have been detemined by the potenticmetric method with a glass electrode. The difference between over-all dissociation constants in each other solvent is found to be of the same crder of magnitude, and the K?/K? ratios in aprotic dimethyl formamide and acetonitrile are much greater than those in protic methanol and water.
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四角形 〔Pt(Ⅱ) Cl(PMe₃)₂Me 〕形態錯物의 計算한 雙極子 모우멘트에 對한 리간드의 cis와 trans 效果에 關한 硏究
盧承宇 忠州大學校 1995 한국교통대학교 논문집 Vol.30 No.2
EHT계산의 고유함수를 이용하여 전이금속 착물의 쌍극자 모멘트에 대한 리간드의 cis 및 trans구조의 영향을 고찰하였다. 계산한 cis착물의 쌍극자 모멘트가 trans 착물의 쌍극자 모멘트보다 큰 값을 가지며 trans착물에 대해 계산한 쌍극자 모멘트가 cis착물의 계산한 쌍극자 모멘트보다 실험값에 접근하였다. 이 결과는 〔Pt(Ⅱ) Cl(PMe₃)₂Me 〕 형태착물이 trans구조로 존재함을 예측할 수 있으며, 또한 계산한 쌍극자 모멘트는 사각형 형태의 전이금속착물에 대한 리간드의 trans효과를 예측할 수 있을 것으로 생각된다.
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盧承宇 충주대 2000 한국교통대학교 논문집 Vol.35 No.2
The NMR chemical shift arising from 3d electron spin dipolar nuclear spin angular momentum interactions for a 3d2 system in a strong crystal field environment of octahedral symmetry has been investigated when the fourfold axis is chosen to be our axis of quantization.The NMR shift is separated into the contribution of 1/R5 and 1/R7 terms.A comparison of the multipolar terms with nonmultipolar results shown that the 1/R5 term contributes dominantly to the NMR shift and there is in good agreement between the exact solution and the multipolar results when R≥0.24.A temperature dependence analysis may lead to the results that the 1/T2 term has the dominant contribution to the NMR shift for a paramagnetic 3d2 system but the contribution of the 1/T term may not be negligible.
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入面體 有機白金(IV) [PtCl₃Me(PMe₂Ph)₂]形態錯物의 計算한 雙極子모멘트에 關한 硏究
盧承宇 충주대학교 1992 한국교통대학교 논문집 Vol.26 No.-
八面體 有機白金(Ⅳ) [PtCl₃Me(PMe₂Ph)₂] 形態 錯物을 選?하여 計算한 雙極子모멘트에 對한 리간드의 trans 效果를 硏究하였다. 八面體 모노메틸 有機白金 形態 錯物 雙極子모멘트를 修正된 EHT計算方法을 使用하여 計算하였다. trans- [PtCl₃Me(PMe₂Ph)₂]를 計算한 雙極子모멘트 値(4.6D)는 cis-[PtCl₃Me(PMe₂Ph)₂]의 計算한 雙極子모멘트 値(10.7D, 13.9D)보다 낮은 갑을 갖으며 實驗値(4.3D)에 매우 接近하였다. 이러한 結果로부터 八面體有機白金(Ⅳ) [PtCl₃Me(PMe₂Ph)₂] 形態 錯物은 trans- [PtCl₃Me(PMe₂Ph)₂]形態의 構造를 갖을 것으로 기대되며 chioro錯物이 實驗的으로 낮은 雙極子모멘트를 갖는 것과 類似한 傾向을 보인다.
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