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朴鍾會,尹錫丞,金永仁 충남대학교 기초과학연구소 1982 연구논문집 Vol.3 No.-
The temperature effects on the absorption spectra of acridine orange and methylene blue in aqueous solution at various concentrations have been observed and found that increase in temperature has an effect on the spectra similar to that of dilution. At the concentrations lower than 10^-6 M, the effect is insignificant. A new attempt has been made to measure the heat of dimerization by utilizing titration calorimetric method and ΔH_D for acridine orange and methylene blue are found to be -11.86 K㎈/mole and -20.01 K㎈/mole, respectively. The values of free energy and entropy of dimerization process are also calculated and found to be ΔG_D=-5.93K㎈/mole, ΔS_D=-13.13 e.u for acridine orange, and ΔG_D=-5.19K㎈/mole, ΔS_D=-50.58 e.u. for methylene blue, respectively. In light of the thermodynamic function results, discussions are made on the interactive forces between the dye molecules to form dye aggregates in water. It has been concluded that the stacking(dispersive and hydrophobic) interactions are thought to be primarily responsible for the self-association of the dye molecules.
朴鍾會,朴茂淳 忠南大學校 1974 論文集 Vol.13 No.1
7-azaindole and 3-carboline show very small changes in their spectra with concentration and no distinct exciton effect is observed. The small effect of H-bonding dimerization upon absorption spectra observed for the above two compounds is explained by the following factors. Firstly, the strength of he H-bond between N and H atoms is relatively weak in genera. Secondly, the absorption intensity of the pure long axis polarized band may be rather weak because the whole intensity is a mixture of more than two bands whose polarization directions are also different each other. The observed incapability of undergoing H-bonding dimerization of 2-aminopyridine can be explained in terms of the tautomerism.
Methylene Blue의 분자회합에 미치는 용매효과
박종회,박무순,박희억,서성원 충남대학교 1985 忠南科學硏究誌 Vol.12 No.2
A typical metachromatic dye, methylene blue(MB), has been found not to associate in ethanol, ethylene glycol, glycerol and 80 wt.% dioxane. The absorption spectra observed in the various kind of organic solvents are in good agreement with the calculated monomer spectra in both the shape and the absorption intensity. These results suggest that the water molecules play an important role in self-association of the dye molecules in aqueous solution. In this study, the changes in intensity and frequency shift of absorption spectra of MB are observed in the mixtures of water and organic solvents with the change in wt.% organic solvent. The discussions are made both upon the change in intensity and the frequency shift. The intensity changes are attributed to the change in the degree of association and the frequency shift is explained in terms of the interaction between the energy states of the MB molecules and the solvent polarity.
朴鍾會,朴茂淳,李弘 圓光大學校 基礎自然科學硏究所 1988 基礎科學硏究誌 Vol.7 No.3
고분자전해질인 Chondroitin sulfate A(CSA) 및 Chondroitin sulfate C(CSC)존재하에서의 methylene blue(MB) 및 acridine orange (AO)의 metachromasy 현상에 관하여 각각 분광학적 방법으로 연구하였다. P/D값의 변화에 따르는 meta-band 의 특성적 변화를 stacking이론에 의하여 설명하였으며, stacking 효과의 정량적 고찰에 의하여 고분자의 반복단위당 결합하는 색소분자의 수를 계산한 결과 MB가 AO보다 강한 stacking 효과를 나타냄이 발견되었다. CSA의 안정한 형태의 골격구조와 dimension을 발견하고 평면 방향색소의 free dimer의 모형을 근거로 CSA의 골격표면에 결합한 색소분자의 stacking 모형과 dimension을 제안하였다. Spectroscopic studies have been carried out on the metachromatic behavior of methylene blue(MB) and acridine orange(AO) in the presence of chondroitin sulfate A(CSA) and chondroitin sulfate C(CSC). The characteristic changes of the meta-band with the changes of P/D value are discussed in terms of the stacking theory. Quantitative studies on the stacking effect are make to calculate the number of bound molecules of dye per unit molecule of the polyanion. The result shows that MB has stronger stacking effect than AO. A stacking model and the dimension of the bound dyes on the surface of the polyanion are proposed, on the basis of the dimer model of planar aromatic dyes and the most stable conformation of the CSA chain. The model is found to be reasonable in accordance with the experimental results.
1-naphthoic acid 및 2-naphthoic acid의 極性및 非極性溶媒에 있어서의 吸收spectra에 關한 硏究
朴種會,李弘,李紀煥 충남대학교 자연과학연구소 1979 學術硏究誌 Vol.6 No.2
In the present paper, the studies upon the ionization and the dimerization equilibria of two aromatic carboxylic acid, 1-naphthoic acid and 2-naphthoic acid have been made by the method of the absorption spectroscopy. By studying on the spectral change with the concentration, it has been found that both acids show the ionization equilibrium in ethanolicsolution and the dimerization in cyclohexane solution. The method of determining the ionization and the dimerization constant and also the method of calculating the absorption curves of pure species, that is, the spectra of monomer, dimer, and undissociated acids are presented, These calculated spectra of pure species are used for the comparison of the experimental results with the theoretical expectation. The spectral change due to the H-bonding dimerization of acids is attributed partly to the H-bonding perturbation effect to the π-system and partly to the interaction of transition moments of the closely approached two monomers in dimeric system. In the case of 2-naphthoic acid, these two effects are distinguishable.
朴鍾會,申大鉉,金演斗,尹錫丞,尹和重,申敏雄 충남대학교 기초과학연구소 1980 연구논문집 Vol.1 No.-
Dimerization constants for acridine orange and methylene blue in aqueous solutions have been determined by absorption spectroscopic method and also the empirical absorption curves of their monomeric and dimeric states are presented. The theories of hypochromism developed by Tinoco and Rhodes using first order perturbation theory and by DeVoe using a purely classical treatment have been modified and applied to the dimeric systems of the above compounds and the theoretical spectra of dimers are computed at various structure determining factors. By making comparison of the computed theoretical spectra with the empirical ones the configurations and the dimensions of the dimeric system of both compounds are determined, and the results are found to be reasonable, i.e., the intermolecular distance is 7.5Å and the angle of twist between the molecular planes is about 25°in both cases.
Methylene Blue의 Metachromasy에 관한 흡수 분광학적 연구 : (화학평형과 Dimer의 구조)
朴鍾會,朴熙億 충남대학교 자연과학연구소 1982 忠南科學硏究誌 Vol.9 No.1
The special change of methylene blue in aqueous solution with concentration change is attributed to the formation of dimerization equilibrium in concentration range 10^-6 to 10^-3 mole·ℓ^-1 and the dimerization constant, K_D, calculated by the method of trial and error is found to be 8.31×10^3. The absorption curves of their monomeric and dimeric states are empirically calculated respectively and these are explained in terms of the molecular exition theory. The spectral shift due to the formation of dinner shows good agreement with the theoretical expection which is made under the assumption that the structure of the dimer has a parallel plane configuration. The dimension of the dinner is also using the excition theory and the distance between the monomers in dimeric system is calculated with various staggering angle. These results have been found reasonable is comparison with the results in recent literatures.