"Bicontinuous cubic" liquid crystalline materials from discotic molecules: A special effect of paraffinic side chains with ionic liquid pendants

Md Akhtarul Alam, Jin Motoyanagi, Yohei Yamamoto, Takanori Fukushima, Jungeun Kim, Kenichi Kato, Masaki Takata, Akinori Saeki, Shu Seki, Seiichi Tagawa, Takuzo Aida

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)

Abstract

(Chemical Equation Presented) Triphenylene (TP) derivatives bearing appropriate paraffinic side chains with imidazolium ion-based ionic liquid (IL) pendants were unveiled to display a phase diagram with liquid crystalline (LC) mesophases of bicontinuous cubic (Cubbi) and hexagonal columnar (Colh) geometries. While their phase transition behaviors are highly dependent on the length of the side chains and the size of the ionic liquid pendants, TPs with hexadecyl side chains exclusively form a Cubbi LC assembly over an extremely wide temperature range of ∼200°C from room temperature when the anions of the IL pendants are relatively small. Wide-angle X-ray diffraction analysis suggested that the Cubbi LC mesophase contains D-stacked columnar TP arrays with a plane-to-plane separation of ∼3.5 Å. Consistently, upon laser flash photolysis, it showed a transient microwave conductivity comparable to that of a Colh LC reference.

Original languageEnglish
Pages (from-to)17722-17723
Number of pages2
JournalJournal of the American Chemical Society
Volume131
Issue number49
DOIs
Publication statusPublished - 2009 Dec 16
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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