Combination of an aromatic core and aromatic side chains which constitutes discotic liquid crystal and organogel supramolecular assemblies

Tsutomu Ishi-I, Tomoyuki Hirayama, Ko Ichi Murakami, Hiroshi Tashiro, Thies Thiemann, Kanji Kubo, Akira Mori, Sumio Yamasaki, Tetsuyuki Akao, Akira Tsuboyama, Taihei Mukaide, Kazunori Ueno, Shuntaro Mataka

Research output: Contribution to journalArticlepeer-review

86 Citations (Scopus)


This paper reports unique and unusual formations of columnar liquid crystals and organogels by self-assembling discotic molecules, which are composed of an aromatic hexaazatriphenylene (HAT) core and six flexible aromatic side chains. In HAT derivatives 3a, with 4′-(N,N-diphenylamino)biphenyl- 4-yl chains, 3b, with 4′-[AT-(2-naphthyl)-N-phenylamino]biphenyl-4-yl chains, and 3c, with 4′-phenoxybiphenyl-4-yl chains, the two-dimensional hexagonal packings can be created by their self-assembling in the liquid crystalline phase, which were characterized by polarizing optical microscopy, differential scanning calorimetry, and X-ray diffraction analysis. In certain solvents, HAT molecules 3a-c can form the viscoelastic fluid organogels, in which one-dimensional aggregates composed of the HAT molecules are self-assembled and entangled into three-dimensional network structures. The organogel structures were analyzed by scanning electron microscopy observation, 1H NMR, UV-vis, and circular dichroism spectroscopy. In contrast to 3a-c, none of the liquid crystalline and organogel phases could be formed from 3d and 3e with short aromatic side chains including a phenylene spacer, and 3f (except a few specific solutions) and 3g without terminal diarylamino and phenoxy groups. In 3a-c, the aromatic side chains with terminal flexible groups make up soft regions that cooperatively stabilize the liquid crystalline and organogel supramolecular structures together with the hard regions of the hexaazatriphenylene core.

Original languageEnglish
Pages (from-to)1261-1268
Number of pages8
Issue number4
Publication statusPublished - Feb 15 2005
Externally publishedYes

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry


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