| dc.description.abstract | Ionic liquid crystals (ILCs) are entirely different properties from those of ordinary organic molecular compounds. They are composed of organic ions, and these organic compounds have unlimited structural variations which are “designable” or “fine-tunable”. Because ILCs’ unique properties that combine the characteristics of liquid crystals (i.e., self-assembling, anisotropic properties, etc.) with those of ionic liquids (i.e., ionic conductivities, and so forth) have been of great interest during the last two decades, we can expect explosive development in the future.
Although the first ILCs being pyridinium salts were reported in 1938, recently the fields of N-based ionic liquid crystals (i.e., Ammonium, Imidazolium, Pyrrolidinium, Piperidinium, Piperazinium, Morpholinium and Pyridinium cations) were also described with increasing interest. About pyridinium-based ILCs, many works are focusing on N-alkylpyridinium salts. Further the aryl- substituted pyridinium cations can make the rigid mesogens found in some works, but N-aryl substituents. So we synthesized the N-arylpyridinium chlorides via Zincke reaction. And we using methanol as a phase-transfer solvent replace the chloride anion into another soft anion by Pearson’s HSAB theory. Then we will describe that ILCs’ characteristics of these type substituents.
In addition to those N-(mono-alkoxyaryl)-pyridinium salts of linear mesogens, we made N-(tri-alkoxyaryl)-pyridinium salts of tapered mesogens, N-(mono- alkoxyaryl)-bipyridinium salts of linear mesogens, and N-(tri-alkoxyaryl)- bipyridinium salts of fan-shaped mesogens. Furthermore, we also concerned about the anion-induced mesogens of pyridinium salts. | en_US |