Title

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

Authors

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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