Structure and physicochemical properties of cation polymethine dyes in Langmuir-Blodgett films

N. Kh Ibrayev, E. V. Seliverstova, A. R. Tenchurina, A. A. Ishchenko, A. Yu Shargaeva

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The physicochemical properties of monomolecular layers of amphiphilic cation polymethine dyes (i.e., thia- and oxacarbocyanines) on the surface of a water subphase are studied along with the conditions of Langmuir-Blodgett (LB) film preparation. The area occupied by one dye molecule in the liquid-stretched and liquid-condensed states of a monolayer is determined. Based on a comparison of experimental and theoretically calculated areas, the nature of dye packing in monolayers is studied by means of molecular mechanics using data from conformation analysis. The spectral and luminescent properties of cationic polymethine dyes in various media are investigated. Excimer fluorescence is observed in LB films. The excimers in LB films are found to arise not from monomers but from dye dimers. A possible mechanism of their formation is considered.

Original languageEnglish
Pages (from-to)2082-2088
Number of pages7
JournalRussian Journal of Physical Chemistry A
Issue number12
Publication statusPublished - 1 Dec 2013
Externally publishedYes


  • Langmuir-Blodgett films
  • optical properties
  • polymethine dyes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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