ORGN 441 |
Disc-shaped hexaazatriphenylene liquid crystals with six aromatic side chains
| Tsutomu Ishi-i1, Tomoyuki Hirayama2, Thies Thiemann1, Kanji Kubo1, Akira Mori1, Akira Tsuboyama3, Taihei Mukaide3, Kazunori Ueno3, and Shuntaro Mataka1. (1) Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga-kohen, Kasuga, 816-8580, Japan, (2) Faculty of Engineering, Kyushu Sangyou University, (3) OL Project, CANON Inc |
In this symposium, we report that disc-shaped hexaazatriphenylenes (HATs) having six aromatic side chains constitute one dimensional supramolecular assemblies in spite of lacking alkyl side chains, leading to the formation of liquid crystals. DSC measurement of HATs with six diphenylaminobiphenyl groups 1 and with phenoxybiphenyl groups 2 indicates presence of mesophase at high temperature. Charasteristic textures such as focal conic and coffee bean are observable in polarizing optical microscopy of 1 and 2. These results indicate the formation of hexagonal discotic liquid crystallines, in which HAT molecules one-dimensionally stack to form supramolecular achitectures. Such hexagonal structures are also supported by X-ray diffraction analysis, which indicates characteristic [100], [110], and [200] peaks corresponding to hexagonal packing. This is an interesting example of columnar liquid crystal that lack flexible alkyl side chains.  |
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Physical Organic, Materials, Heterocycles, Aromatics, Metal-Mediated Reactions
8:00 PM-10:00 PM, Tuesday, September 9, 2003 Hilton New York -- Americas Hall 1, Poster
Division of Organic Chemistry
The 226th ACS National Meeting, New York, NY, September 7-11, 2003
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