Reference interaction site model study of self-aggregating cyanine dyes

Gennady N. Chuev, Maxim V. Fedorov

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Using the reference interaction site model and supramolecular approach, we modeled the aggregation of thea-monomethinecyanine dyes in water. Various modifications of the hypernetted-closure expression for the excess free energy have been studied. We found that the partial wave approximation with semiempirical corrections for excluded volume and hydrogen bonding effects provides estimations of the binding and dimerization energies of the aggregates, which are in agreement with available experimental data. The hydrated H-dimers are obtained to be more stable than the hydrated J-dimers. However, the complexes consisting from more than four monomers change their arrangement while self-assembling in water and form ladderlike structures. We propose a model explaining this structural transition.

Original languageEnglish
Article number074503
Pages (from-to)-
Number of pages8
JournalJournal of Chemical Physics
Volume131
Issue number7
DOIs
Publication statusPublished - 21 Aug 2009

Keywords

  • aggregation
  • association
  • binding energy
  • dyes
  • free energy
  • hydrogen bonds
  • macromolecules
  • solvation free-energy
  • integral equation theory
  • aqueous solutions
  • polar molecules
  • hypernetted chain
  • hydration

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