Liquid crystal-directed assembly and phase morphology of a squaraine dye

Maher A. Qaddoura, Kevin D. Belfield, Paul A. Heiney

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The squaraine (SQ) dye, 2,4-bis [4-(N,N-di-n-hexylamino)-2-hydroxyphenyl] squaraine was synthesised, and a series of SQ dye/cholesteryl pelargonate binary mixtures with varying dye concentrations (1%, 3%, 7.5%, 10.8%, 15% and 20% w/w) were prepared. Their phase transitions were investigated using differential scanning calorimetry, polarised light microscopy and X-ray diffraction. The SQ dye itself exhibited no liquid crystalline behaviour. The concentration of the dye in the cholesteric compound proved to have a significant effect on the dye aggregation behaviour and phase transitions in cholesteryl pelargonate, resulting in the appearance of new mesophases and the formation of J- and H-aggregates. The texture morphology, X-ray diffraction data and UV-vis absorbance spectra provide strong evidence of the viability of liquid crystal-directed assembly of the SQ dye.

Original languageEnglish (US)
Pages (from-to)299-311
Number of pages13
JournalSupramolecular Chemistry
Issue number5
StatePublished - May 1 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry


  • H-aggregate
  • J-aggregate
  • liquid crystalline mesophase
  • self-assembly
  • squaraine dyes


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