Journal
SUPRAMOLECULAR CHEMISTRY
Volume 24, Issue 5, Pages 299-311Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10610278.2012.658391
Keywords
squaraine dyes; liquid crystalline mesophase; self-assembly; J-aggregate; H-aggregate
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Funding
- National Science Foundation [CHE-0832622, DMR-0520020]
- National Academy of Sciences [PGA-P210877]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0832622] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1120901] Funding Source: National Science Foundation
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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.
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