Journal
JOURNAL OF PHYSICAL ORGANIC CHEMISTRY
Volume 31, Issue 3, Pages -Publisher
WILEY
DOI: 10.1002/poc.3779
Keywords
amidinium; de Vries material; guanidinium; imidazolium; ionic liquid crystals; smectic C
Categories
Funding
- Deutsche Forschungsgemeinschaft [La 907/17-1, Gi 243/8-1]
- Bundesministerium fur Bildung und Forschung [01RI05177]
- Carl-Schneider Stiftung Aalen
- Ministerium fur Wissenschaft, Forschung und Kunst des Landes Baden Wurttemberg
- Fonds der Chemischen Industrie
Ask authors/readers for more resources
The tilted smectic C phase is a rather uncommon phase in ionic liquid crystals (ILCs), whereas the orthogonal smectic A phase is the most common phase in ILCs. We now present 2 new groups of mesogens with an azobenzene core that exhibit smectic C as well as smectic A phases. Their phase sequences and tilt angles were studied by polarizing microscopy, and their temperature-dependent layer spacings and orientational order parameters were investigated by X-ray diffraction. We present 1 new amidinium azobenzene mesogen that forms enantiotropic smectic C and A phases and another amidinium as well as 2 new guanidinium azobenzene mesogens that exhibit monotropic smectic C and enantiotropic smectic A phases. With this study, we show that azobenzene is indeed an SmC-promoting group in ILCs. Comparing these results with our earlier results on azobenzenes with an N-methylimidazolium head group (N Kapernaum et al, ChemPhysChem 2016, 17, 4116-4123), we show that the aromaticity of the imidazolium head group plays an important role in the formation of smectic C phases.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available