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

    Authors

    M. A. Qaddoura; K. D. Belfield;P. A. Heiney

    Comments

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    Abbreviated Journal Title

    Supramol. Chem.

    Keywords

    squaraine dyes; liquid crystalline mesophase; self-assembly; J-aggregate; H-aggregate; LANGMUIR-BLODGETT-FILMS; X-RAY; AGGREGATION; ORIENTATION; ALKANOATES; CHEMISTRY; TEXTURE; Chemistry, Multidisciplinary

    Abstract

    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.

    Journal Title

    Supramolecular Chemistry

    Volume

    24

    Issue/Number

    5

    Publication Date

    1-1-2012

    Document Type

    Article

    Language

    English

    First Page

    299

    Last Page

    311

    WOS Identifier

    WOS:000304373900001

    ISSN

    1061-0278

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