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

• Authors: G.J. Ashwell , G. Jefferies , D.G. Hamilton , T. Handa
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

81.15.Lm; 73.20.Μf

• Journal: Acta Physica Polonica A
• Year: 1995
• Volume: 88
• Issue: 3
• Pages: 483-488

Dates

published

1995-09

received

1995-05-05

(unknown)

1995-06-12

Contributors

author

G.J. Ashwell

• Centre for Molecular Electronics, Cranfield University, Cranfield MK43 OAL, UK

author

G. Jefferies

• Centre for Molecular Electronics, Cranfield University, Cranfield MK43 OAL, UK

author

D.G. Hamilton

• Centre for Molecular Electronics, Cranfield University, Cranfield MK43 OAL, UK

author

T. Handa

• Centre for Molecular Electronics, Cranfield University, Cranfield MK43 OAL, UK