1. Novel Discotic Boroxines: Synthesis and Mesomorphic Properties.
- Author
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Wöhrle, Tobias, Baro, Angelika, and Laschat, Sabine
- Subjects
- *
DISCOTIC liquid crystals , *DIFFERENTIAL scanning calorimetry , *MESOPHASES , *CHEMICAL synthesis , *ALKYL group , *X-ray diffraction - Abstract
A new synthetic approach to highly substituted triphenylboroxines 11 is described. Their mesomorphic properties were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (SAXS, WAXS). The tris(3,4,5-trialkyloxy)phenyl functionalized derivatives 11b-e showed broad mesophases for a minimum alkyl chain length of C9. The phase widths ranged from 110 K to 77 K near room temperature, thus decreasing with enhanced alkyl chain lengths. Textures observed under POM indicated a columnar hexagonal (Colh) mesophase symmetry that was confirmed by X-ray diffraction experiments. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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