Dynamic Analysis of Adsorption-Desorption Equilibrium of Sublimed Aromatic Molecules Using Polarized Optical Waveguide Spectroscopy

Abstract

The adsorption-desorption equilibrium of sublimed molecules has been analyzed dynamically by optical waveguide (OWG) spectroscopy. Dynamic change of the transition moment during adsorption behavior was successfully detected using polarized incident light. With this technique, sublimed planer aromatic molecules, such as azobenzene, were revealed to stack parallel to the solid surface at the initial stage followed by adsorption with relatively random orientation.

Lanthanide-Oligomeric Brush Films: From Luminescence Properties to Structure Resolution

“…From the optical waveguide spectra, the average orientation angle of the complex into the films was calculated (Figure c,d, equations are given in Figure S14). , In the [1-EuL] film, the average angle of the complex with the z -axis was about 80°. By increasing the number of generations, the average angle decreased to 68°, demonstrating that the complexes became more tilted.…”

Temperature-dependent changes in the molecular orientation and visible color of phthalocyanine films

“…When polarized incident light is used, the linear dichroism spectra provide information regarding the molecular orientation at the interface. [29][30][31] According to previous studies, intense visible-to-NIR bands of Pcs are effective for determining their molecular orientation on thin lm by polarized optical waveguide spectroscopy. 32,33 Optical waveguide spectra of the thin lm of 1 obtained using non-polarized, spolarized, and p-polarized light at various temperatures are shown in Fig.…”

Adsorption Behavior of Curcumin onto Cetyltrimethylammonium Chloride Reverse Micelles Immobilized on a Glass Surface As Studied by Polarized Visible Attenuated Total Reflection Spectrometry with a Glass Slab Optical Waveguide

“…11,12 Moreover, it is applicable to molecules that are not fluorophores, and information on the orientation of adsorbed molecules can be obtained with polarization (linear dichroism) measurements. [13][14][15] We have been using glass SOWGs for chemical sensing of traces of various compounds, [16][17][18] electrospectrochemistry, 19,20 and the characterization of modified and unmodified glass surfaces using dye molecules with polarization measurements. 14,21,22 In this study, polarized visible ATR spectrometry with a glass SOWG was applied to study the adsorption behavior of a hydrophobic dye, curcumin, onto the CTAC reverse micelle immobilized on a glass surface to characterize the immobilized CTAC reverse micelle.…”