Abstract
Three types of Langmuir-Blodgett film of an azobenzene derivative were prepared by hetero Y-type, Y-type and Z-type deposition methods. The molecular orientations in the films were determined from the analysis of the linear Stark effect (electroabsorption) spectra. Molecules in the hetero Y-type film were proved to align asymmetrically. However, molecular orientation in the Z-type films showed very small asymmetry. Investigation of the long spacings determined from X-ray diffraction supported the conclusion from the Stark effect.
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