Abstract

Langmuir-Blodgett films of salts of the two-legged cationic dye, E-N-hexadecyl-2-[2-(4-docosylaminophenyl)ethenyi]benzothiazolium, are Z-type. The molecular configuration within the Langmuir—Blodgett film is either U-shaped or stretched depending upon the nature of the anion, the thickness per layer being 35.1 Α for the octadecylsulphate and 54.1 Α for the iodide. For the Langmuir—Blodgett monolayers the principal components of the second order susceptibility (0 1) are 70 pm V -1 and 34 pm V -1 respectively at 532 nm. In the case of the octadecylsulphate salt it was possible to fabricate thick multilayer Langmuir-Blodgett films; the second harmonic intensity increased with the number of Z-type layers, albeit subquadratically, and this may be ascribed to a progressive variatioii in the chromophore tilt angle. PACS numbers: 73.20.Μf, 81.15.Lm

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