Self-assembly of thermotropic liquid-crystalline folic acid derivatives: hydrogen-bonded complexes forming layers and columnsBasis of a presentation given at Materials Discussion No. 4, 11â 14 September 2001, Grasmere, UK.
Kanie, Kiyoshi; Nishii, Masayuki; Yasuda, Takayasu; Taki, Takashi; Ujiie, Seiji; Kato, Takashi; Kanie Kiyoshi; Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo; Nishii Masayuki; Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo; Yasuda Takayasu; Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo; Taki Takashi; Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo; Ujiie Seiji; Department of Material Science, Shimane University; Kato Takashi; Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo
Журнал:
Journal of Materials Chemistry
Дата:
2001
Аннотация:
Folic acid derivatives having 2-(3,4-dialkoxyphenyl)ethyl moieties have been found to exhibit thermotropic liquid-crystalline behavior. Smectic and discotic phases are observed for these compounds over wide temperature ranges. X-Ray diffraction and infrared measurements show that the formation of the smectic and discotic phases is due to the ribbon- and disk-like structures of the pterin rings of folic acid, respectively. The smectic phase is changed to a hexagonal columnar phase by the addition of alkali metal salts. This behavior is attributed to the change of the hydrogen-bonded structures from ribbon to disk induced by the ionâ dipolar interactions.
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