Monolayers and Langmuir-Blodgett films of a semifluorinated tetrathiafulvalene derivative

E. Dupart, B. Agricole, S. Ravaine, C. Mingotaud, O. Fichet, P. Delhaes, H. Ohnuki, G. Munger, R. M. Leblanc

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24 Scopus citations


A new semifluorinated tetrathiafulvalene (SFTTF) derivative was prepared and its behaviour at the air-water interface (π-A and ΔV-A isotherms) and in multilayer films was studied. The deposition (Y type) of such a pure SFTTF monolayer (i.e. without fatty acid) onto solid substrates was successful with a good transfer ratio. X-ray experiments and IR dichroism suggests a tilt angle (ca.35°) of the semifluorinated chains with respect to the normal of the substrate. Under an atmosphere saturated with iodine vapours, the Langmuir-Blodgett films exhibit a brown colour with a broad charge transfer band around 8500 cm-1 and a low d.c. conductivity, suggesting the formation of totally ionized TTF-type dimers. After iodination and under air exposure, iodine is rapidly lost by the films and a new charge transfer band around 3400 cm-1 appears, indicating the formation of partially ionized dimers. These changes are analysed through a reversible iodination-deiodination cycle.

Original languageEnglish (US)
Pages (from-to)575-580
Number of pages6
JournalThin Solid Films
Issue number1-2
StatePublished - May 1 1994
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry


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