科研之友
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摘要
A series of flavones (n-F) substituted at the 4, and 6 positions was prepared, characterised by NMR (H-1,C-13), 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. [GRAPHICS] .
- 出版日期2017
- 单位rutgers
