Abstract
Molecular orientation was quantitatively evaluated for alternating Langmuir-Blodgett (LB) films of 5-( p-dodecyloxyphenyl)pyrazine-2-carboxylic acid and stearic acid- d 35 by comparing the absorption intensities between Fourier transform IR transmission and reflection-absorption spectra. Orientation angles in the alternating film of the barium salts were almost the same as the corresponding values in the homogeneous LB film of each salt. However, the tilt angles in the alternating film of acids were larger than those in the alternating film of barium salts or in the homogeneous LB film of each acid. These findings indicate that molecular orientations in the alternating films of barium salts are mainly governed by the intermolecular interaction in the same monolayer, and those in the alternating films of acids are mainly affected by the interlayer interaction between the adjacent monolayers.
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