Abstract
A series of flavones (n-F) substituted at the 4′, and 6 positions was prepared, characterised by NMR (1H,13C), HRMS, and studied for liquid crystal properties. The 4′-alkoxy,6-methoxyflavones (4-F–16-F) exhibit varying ranges of nematic and smectic A phases as evidenced by polarised optical microscopy and differential scanning calorimetry (DSC). As the tail length is increased, the smectic phase becomes more prevalent. Smectic phases for (8-F–16-F) were further analysed by powder X-ray diffraction (XRD), and the rate of structural transformations was explored by combined DSC/XRD studies. Flavonol 6-F–OH was also prepared but no mesogenic behaviour was observed. The molecular structures of 6-F and 6-F–OH were determined by single-crystal XRD and help to explain the differences in material properties. Additionally, fluorescence and electrochemical studies were conducted on solutions of n-F.
Original language | American English |
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Pages (from-to) | 1436-1449 |
Number of pages | 14 |
Journal | Liquid Crystals |
Volume | 44 |
Issue number | 9 |
DOIs | |
State | Published - Jul 15 2017 |
ASJC Scopus subject areas
- General Chemistry
- General Materials Science
- Condensed Matter Physics
Keywords
- Liquid crystal
- combined DSC/XRD
- flavone
- fluorescence
- heterocycle
- thermotropic