Influence of molecular structure of squaraine dyes on their aggregation in aqueous solutions

Sh N. Nizamov, M. N. Barakaeva, E. N. Kurtaliev, A. L. Tatarets, L. D. Patsenker

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The influence of the molecular structure of several squaraine dyes on their aggregation in aqueous solutions and its spectral manifestation were studied. The results are analyzed using quantum-chemical modeling. It is shown that a transverse dipole moment in squaraine molecules contributes to aggregation with an antiparallel orientation of the molecules whereas a longitudinal dipole moment leads to formation of J-type aggregation with a longitudinal orientation of the molecules. In some instances both aggregate types are present in the solution over a wide concentration range.

Original languageEnglish
Pages (from-to)464-469
Number of pages6
JournalJournal of Applied Spectroscopy
Volume76
Issue number4
DOIs
StatePublished - Sep 2009
Externally publishedYes

Keywords

  • Absorption
  • Fluorescence
  • Molecular aggregation
  • Quantum-chemical calculation
  • Squaraine dyes

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