Langmuir-Blodgett films of pyridinium-dicyanomethanide dyes mixtures with photobleachable absorption bands

Riccardo Ricceri*, Alessandro Abbotto, Antonio Facchetti, Daniela Grando, Gabriella Gabrielli, Giorgio A. Pagani

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We report on Langmuir-Blodgett (LB) films characterization of 4-[5-dicyanomethanido)thien-2-y1]-N-(n-hexadecyl)pyridinium (C16H33-PDCNT), and 1-(N-(n-hexadecy]-4-pyridinio)-2-[5-(dicyanomethanido)thien-2-yl]ethene (C16H33-PDCNTE); LB films of the pure compounds and of the mixtures of the two compounds were prepared at 291 K: UV-vis investigation revealed the presence of photobleachable absorption bands, the ones at about 530 nm and 640 nm were due to charge transfer transitions of the monomer of C16H33-PDCNT and C16H33-PDCNTE, respectively; the sharp, photobleachable ones shifted to shorter wavelengths were due to H-aggregates of the two compounds. By changing the molar ratios of the two compounds in the mixtures and in other cases by annealing the LB films, the absorption maxima of the sharp, photobleachable bands due to H-aggregates could be tuned in the range 415-467 nm. These LB films are thus very promising in view of optical data storage applications. Copyright (C) 1999 Elsevier Science B.V.

Original languageEnglish (US)
Pages (from-to)289-296
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Issue number1-3
StatePublished - May 1 1999


  • H-aggregates
  • Langmuir-Blodgett films
  • Optical data storage
  • Photobleachable absorption bands
  • Push-pull dyes mixtures

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry


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