6533b837fe1ef96bd12a2594
RESEARCH PRODUCT
Hexagonal-columnar mesophases of acylated azacrowns with enhanced stabilities
C. MertesdorfH. Ringsdorfsubject
AcylationSteric effectsCrystallographyChemistryHexagonal crystal systemDiscotic liquid crystalOrganic chemistryColumnar phasedescription
A series of discotic liquid crystals based on completely acylated macrocyclic oligoamines (azacrowns) has been synthesized. Discotic mesophases could be very highly stabilized by making use of an increased steric hindrance, caused by supplemental lateral meta-substituents which were introduced into the cinnamic acids used as the acylation agents. Employing this method yields compounds exhibiting hexagonal mesophases over a very broad range of more than 300°. Even if very large macrocycles are used as the core of such disc-shaped compounds, enantiotropic mesophases are achieved. Themeta-substituents as well as the size of the azacrowns were varied and their influence on the mesomorphic behavior was studied.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1992-01-01 | Molecular Engineering |