Ionic perylene-3,4-dicarboximide as chromonic mesogens and the use of a fluorescence technique in determining phase-transition temperatures

Huang, Liming; Tam-Chang, Suk-Wah

doi:10.1080/02678291003710433

Cited by 1 publication

(1 citation statement)

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“…Although CLCs have been known for decades, the range of molecules known to form chromonics mesophases is still limited to a few drug molecules, − dyes, − and biomolecules. , Studies on dyes have been sometimes hampered by impurities present in commercial samples: for instance, the presence of residual inorganic salts is known to strongly affect the phase behavior of lyotropic liquid crystals. ,, …”

Section: Introductionmentioning

confidence: 99%

Self-Assembly and Formation of Chromonic Liquid Crystals from the Dyes Quinaldine Red Acetate and Pyronin Y

et al. 2016

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The aqueous self-assembly behavior of the dyes Quinaldine red acetate and Pyronin Y in a wide range of concentrations is reported here for the first time. (1)H NMR spectroscopy, polarized-light optical microscopy, and small and wide X-ray scattering were used to get insight into molecular interactions, phase boundaries and aggregate structure. Quinaldine red acetate and Pyronin Y self-organize into unimolecular stacks driven by attractive aromatic interactions. At high concentrations, spatial correlation among the molecular stacks gives rise to nematic liquid crystals in both systems. Quinaldine red acetate additionally produces a rare chromonic O phase built of columnar aggregates with anisotropic cross-section ordered in a rectangular lattice. The O phase changes into a columnar lamellar structure as a result of a temperature-induced phase transition. Results open the possibility of finding chromonic liquid crystals in other commercially available dyes with a similar molecular structure. This would eventually expand the availability of these unique soft materials and thus introduce new applications for marketed dyes.

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