Abstract
The structure and orientation of pyranine-adsorbed octadecylamine (ODA) LB films were investigated by several spectroscopic methods (UV–vis and fluorescence) and X-ray diffraction. Depending on preparation manners (deposition of a mixed monolayer of ODA and pyranine at the air/water interface or immersion of ODA LB films into a pyranine solution), pyranine-adsorbed films, respectively, exhibit unique structures and photo-excited relaxation processes. The excited state proton transfer (ESPT) in the pyranine-adsorbed ODA LB films was investigated by measurement of fluorescence lifetimes. From the results, the effect of π– π stacking interaction upon the ESPT in the LB films is considered to be similar to the one of the electron-withdrawing substitute in the bulk solution.
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