title: "Bicontinuous cubic" liquid crystalline materials from discotic molecules: a special effect of paraffinic side chains with ionic liquid pendants.
abstract: 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 (Cub(bi)) and hexagonal columnar (Col(h)) 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 Cub(bi) LC assembly over an extremely wide temperature range of approximately 200 degrees C from room temperature when the anions of the IL pendants are relatively small. Wide-angle X-ray diffraction analysis suggested that the Cub(bi) LC mesophase contains pi-stacked columnar TP arrays with a plane-to-plane separation of approximately 3.5 A. Consistently, upon laser flash photolysis, it showed a transient microwave conductivity comparable to that of a Col(h) LC reference.
authors.affiliation: ERATO-SORST Nanospace Project, Japan Science and Technology Agency (JST), 2-41 Aomi, Koto-ku, Tokyo 135-0064, Japan.
authors.forename: Md Akhtarul
authors.initials: MA
authors.lastname: Alam
authors.forename: Jin
authors.initials: J
authors.lastname: Motoyanagi
authors.forename: Yohei
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: Takanori
authors.initials: T
authors.lastname: Fukushima
authors.forename: Jungeun
authors.initials: J
authors.lastname: Kim
authors.forename: Kenichi
authors.initials: K
authors.lastname: Kato
authors.forename: Masaki
authors.initials: M
authors.lastname: Takata
authors.forename: Akinori
authors.initials: A
authors.lastname: Saeki
authors.forename: Shu
authors.initials: S
authors.lastname: Seki
authors.forename: Seiichi
authors.initials: S
authors.lastname: Tagawa
authors.forename: Takuzo
authors.initials: T
authors.lastname: Aida
mesh_terms: D002911:Chrysenes / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D050866:Liquid Crystals / Q000737:chemistry*; D015394:Molecular Structure; D010232:Paraffin / Q000737:chemistry*
chemical_list: D002911:Chrysenes; D052578:Ionic Liquids; C009590:triphenylene; D010232:Paraffin