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SOLUBILIZATION OF 4-HYDROXY-$4^1$-NITROSTILBENE IN MICELLAR SOLUTIONS
Shin, Dong-Myung,Kim, Yong-In,Kwon, Ohoak,Oh, Yung-Hee Korean Society of Photoscience 1995 Journal of Photosciences Vol.2 No.2
Solvatochromic effects and hydrogen bonding interactions of 4-hydroxy-4'-nitrostilbene(NSOH) were investigated. Electronic transition energies of NSOH have good correlation with Taft's $\pi$$^*$. The hydrogen bonding interactions can be accounted by analysis with equation of $\Delta$E= $\Delta$E$_0$ + s($\pi$$^*$ + d$\delta$) + a$\alpha$ + b$\beta$. From UV-visible absorption maximum energies, $\Delta$E = 81.2 kcal/mole - 6.66($\pi$$^*$ - 0.20$\delta$) - 0.66$\alpha$ - 1.93$\beta$ (corr.=0.970) was obtained, and from fluorescence intensity maximum energies, $\Delta$E= 70.07 kcal/mole - 21.6($\pi$$^*$ - 0.11d) - 1.74$\alpha$ - 2.73$\beta$ (corr.=0.947) was obtained. The micropolarity estimated at the solubilization sites is close to the polarity of water. The apparent Taft's $\pi$$^*$ values of solubilization sites are close to 1. Howcver, the solubilization sites for the fluorescent NSOH is rather nonpolar. Both NSOH and NSO$^-$ can be solubilized in CTAB and CTAC micelles and NSOH is the only species that can be solubilized in SDS and Brij-35 micelles.
MORPHOLOGICAL CHARACTERISTICS OF NONLINEAR OPTICAL MOLECULES AT THE AIR/WATER INTERFACE
Lim, Sung-Taek,Park, Mi-Kyung,Shin, Dong-Myung,Kwon, Ohoak Korean Society of Photoscience 1998 Journal of Photosciences Vol.5 No.1
The texture change of non-linear optical molecules at the air/water interface was investigated as a function of surface pressure with Brewster angle microscopy. The texture change resulted from the aggregation of dye molecules is important to understand the film uniformity and grain formation process. The 4-Octadecylhydroxy-4'-nitrostilbene (OHNS) generated the small spots of size around 1$\mu$m. The spots exhibit high contrast with other film area and do not show angle dependent reflectivity change. It is interesting to observe that the size of the domain stays the same as the film pressure increases. At high surface pressure, the contrast ratio of domains becomes high, which means dense packing of OHNS. And, the size of domain grows. In the middle of domain, highly contrasted domains are formed. The first and the second order transitions of OHNS observed from surface pressure-area isotherm result from the two types of grains. The N,N-Dihexadecylcyanoaniline (DHCA) formed highly contrasted gains over entire region, and the grains are the double layers. The difference in Langmuir film of OHNS and DHCA at the air/water interface is consistent with the small tilt angle from the surface normal for OHNS and the large tilt angle for DHCA in the Langmuir-Blodgett films.