Abstract
UDC 539.23:547-304.4 E. A. Gracheva, and V. S. Mikulich Thin fi lms and multilayer thin-fi lm coatings based on the new dichroic azo dye disodium bis[(4-hydroxy-3carboxylate-6-methyl)phenylazo]-5,5�c -dioxobenzothiophene (FtF-1) were produced by the spin-coating method. The optical properties and morphology of the FtF-1 fi lms depended on the formation conditions and used solvents. Reversible photo-induced dichroism was observed in fi lms obtained by spin-coating of FtF-1 solutions in DMF and aqueous polyvinylpyrrolidone on quartz substrates upon irradiation with plane-polarized light (�� = 450 nm, I = 15 mW/cm 2 ). The anisotropic properties of the FtF-1 fi lms were caused by trans-cis-isomerization of the irradiated dye molecules.
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