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Liquid crystalline oligomers derived from cholesterol: synthesis and columnar mesomorphism
- Source :
- Liquid Crystals. 45:362-369
- Publication Year :
- 2017
- Publisher :
- Informa UK Limited, 2017.
-
Abstract
- The novel columnar liquid crystals based on symmetric hairpin-shaped cholesterol tetramers bridged by rigid or hydrogen-bonding Schiff-base spacers were prepared by reacting cholesterol dimer with phenylenediamines or dihydrazides in yields of 70–85%. Structural characterisation of these new compounds had been achieved by infrared, nuclear magnetic resonance and mass spectrometry. Their mesomorphic properties were investigated by polarising optical microscopy, differential scanning calorimetry and X-ray diffraction. They exhibited good hexagonal columnar mesophase with three molecules in a disc of the columnar hexagonal state. This study implied that the symmetric cholesterol tetramers with rigid cores or hydrogen-bonding cores prefer to columnar mesophase.
- Subjects :
- Materials science
genetic structures
Dimer
Mesophase
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
0104 chemical sciences
law.invention
chemistry.chemical_compound
Crystallography
Differential scanning calorimetry
Optical microscope
chemistry
Tetramer
law
Liquid crystal
Organic chemistry
Molecule
General Materials Science
0210 nano-technology
Columnar phase
Subjects
Details
- ISSN :
- 13665855 and 02678292
- Volume :
- 45
- Database :
- OpenAIRE
- Journal :
- Liquid Crystals
- Accession number :
- edsair.doi.dedup.....4b74778234bdfc5aafd22f2053438df2