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Counterion Effects on the Structure of Langmuir-Blodgett Films of a Benzothiazolium Dye

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Ashwell G. J., Jefferies G., Hamilton D. G., Handa T.

Acta Physica Polonica A

1995

vol. 88

issue 3

483-488

Langmuir-Blodgett films of salts of the two-legged cationic dye, E-N-hexadecyl-2-[2-(4-docosylaminophenyl)ethenyl]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 Å for the octadecylsulphate and 54.1 Å for the iodide. For the Langmuir-Blodgett monolayers the principal components of the second order susceptibility (χ_{zzz}^{(2)}) 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 variation in the chromophore tilt angle.

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1 Acta Physica Polonica A

1 1995

1 Ashwell G. J.

1 Hamilton D. G.

1 Handa T.

1 Jefferies G.

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Counterion Effects on the Structure of Langmuir-Blodgett Films of a Benzothiazolium Dye