Anisotropic Structures in Aqueous Solutions of Aggregated Pseudoisocyanine Dyes

@inproceedings{Stegemeyer1996AnisotropicSI,
  title={Anisotropic Structures in Aqueous Solutions of Aggregated Pseudoisocyanine Dyes},
  author={Horst Stegemeyer and Fredrik St{\"o}ckel},
  year={1996}
}
On increasing concentration in highly diluted aqueous solutions of pseudoisocyanine dyes an intensive absorption band of extremely small half-width (Scheibe band) occurs which is attributed to the formation of dye aggregates (Scheibe or J-aggregates). By polarizing microscopy it is shown that aqueous solutions of pseudoisocyanine diethylchloride at low temperatures and at concentrations c > 0.2wt% become birefringent and exhibit a Schlieren texture characteristic for nematic liquid crystals… CONTINUE READING