Recently, we have developed an application of molecular spectrometric method to the exploration of the interracial properties of black soap films, using an azobenzene dye as a probe. In order to further study the prob...Recently, we have developed an application of molecular spectrometric method to the exploration of the interracial properties of black soap films, using an azobenzene dye as a probe. In order to further study the problems of surface potential and microenvfronment, an effort should be made to clarify the pH controlled behavior of the structural change of azobenzene compounds in aqueous solution and on the surface of surfactant mlcella. Here, we examine the resonance Raman spectra of brilliant yellow(BY), an azobenzene derivative, in aqueous and cetyltrimethylammonium bromide(CTAB) micella展开更多
The cationic amphiphilic lipid type compound 1,1’-{[3,5-bis(dodecyloxycarbonyl)-4-phenyl-1,4- dihydropyridin-2,6-diyl]dimethylene} bispyridinium dibromide (1,4-DHP lipid) (charge +2), is a gene transfection agent. Th...The cationic amphiphilic lipid type compound 1,1’-{[3,5-bis(dodecyloxycarbonyl)-4-phenyl-1,4- dihydropyridin-2,6-diyl]dimethylene} bispyridinium dibromide (1,4-DHP lipid) (charge +2), is a gene transfection agent. The electronic structure of 1,4-DHP lipid molecule was investigated by ab initio quantum mechanics, the charges were derived, and the supramolecular structure formed by 1,4-DHP lipid molecules in water was investigated by means of molecular dynamics simulation, f99 force field, version AMBER 8.0. During the molecular dynamics simulations of 10 ns of MD 1,4-DHP lipid formed a worm-like micellae, which was preserved during the time course of 300 ns of MD simulations. Result was confirmed with the electron microscopy showing extended, rod-like structures as one of the 1,4-DHP lipid supramolecular structures, which are expected to be formed at high 1,4-DHP lipid concentrations.展开更多
The deprotonation of an amphiphilic porphyrin, meso-tetra (p-hydroxylphenyl)porphyrin with a hexadecyl chain(THPPH2), has been observed by means of UV-Visspectroscopy in CTAB micellar solutions. With increasing of PH ...The deprotonation of an amphiphilic porphyrin, meso-tetra (p-hydroxylphenyl)porphyrin with a hexadecyl chain(THPPH2), has been observed by means of UV-Visspectroscopy in CTAB micellar solutions. With increasing of PH values, the Soret band shiftsfrom 424 nm to 441nm, and the four-Q bands (520 nm, 560 nm, 595nm, 655 nm) aredisappeared while two new Q-bands are appeared at 585 nm and 675 nm, which is similar tometal-porphyrin, means that the deprotonation of porphyrin takes place. Comparing withthe spectra in an other solutions, the spectral characteration of THPPH2 in neutral and inbasic CTAB solutions is similar to that in CHCI3 and basic aqueous solutions respectively,suggesting that the solubilizing location of THPPH2 takes a change from inner to the outer of theCTAB micellars with the PH value of solutions increasing between 6. 20 and 11. 19.展开更多
文摘Recently, we have developed an application of molecular spectrometric method to the exploration of the interracial properties of black soap films, using an azobenzene dye as a probe. In order to further study the problems of surface potential and microenvfronment, an effort should be made to clarify the pH controlled behavior of the structural change of azobenzene compounds in aqueous solution and on the surface of surfactant mlcella. Here, we examine the resonance Raman spectra of brilliant yellow(BY), an azobenzene derivative, in aqueous and cetyltrimethylammonium bromide(CTAB) micella
文摘The cationic amphiphilic lipid type compound 1,1’-{[3,5-bis(dodecyloxycarbonyl)-4-phenyl-1,4- dihydropyridin-2,6-diyl]dimethylene} bispyridinium dibromide (1,4-DHP lipid) (charge +2), is a gene transfection agent. The electronic structure of 1,4-DHP lipid molecule was investigated by ab initio quantum mechanics, the charges were derived, and the supramolecular structure formed by 1,4-DHP lipid molecules in water was investigated by means of molecular dynamics simulation, f99 force field, version AMBER 8.0. During the molecular dynamics simulations of 10 ns of MD 1,4-DHP lipid formed a worm-like micellae, which was preserved during the time course of 300 ns of MD simulations. Result was confirmed with the electron microscopy showing extended, rod-like structures as one of the 1,4-DHP lipid supramolecular structures, which are expected to be formed at high 1,4-DHP lipid concentrations.
文摘The deprotonation of an amphiphilic porphyrin, meso-tetra (p-hydroxylphenyl)porphyrin with a hexadecyl chain(THPPH2), has been observed by means of UV-Visspectroscopy in CTAB micellar solutions. With increasing of PH values, the Soret band shiftsfrom 424 nm to 441nm, and the four-Q bands (520 nm, 560 nm, 595nm, 655 nm) aredisappeared while two new Q-bands are appeared at 585 nm and 675 nm, which is similar tometal-porphyrin, means that the deprotonation of porphyrin takes place. Comparing withthe spectra in an other solutions, the spectral characteration of THPPH2 in neutral and inbasic CTAB solutions is similar to that in CHCI3 and basic aqueous solutions respectively,suggesting that the solubilizing location of THPPH2 takes a change from inner to the outer of theCTAB micellars with the PH value of solutions increasing between 6. 20 and 11. 19.
