The molecular structures and properties of anthraquinone-type dichroic dyes

Article abstract of DOI:10.1080/10587250108024989

Relations between the molecular structures and properties of anthraquinone-type dichroic 4 dyes were studied. Newly developed asymmetric dyes with thiophenyl groups are highly soluble in fluorinated liquid crystals and the dichroic ratios of these dyes are high (about 10). However, ortho-position (thiophenyl)-substituted dyes have lower solubilities and dichroic ratios than other position-substituted dyes. The properties of anthraquinone dyes with anilino groups are much lower than those of dyes with thiophenyl groups. These results can be strongly related to the flexibility of substituents. We newly established a hypothesis concerning dyes in liquid crystal solvent. In liquid crystals, the dye has a suitable conformation to adjust to liquid crystal phase. In this conformation, the solubilities and dichroic ratios are increased because the interactions between the dye molecules and liquid crystal molecules are strengthened. Flexible substituents are considered to easily form a suitable conformation and realize excellent properties.

Full text of DOI:10.1080/10587250108024989

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Molecular Crystals and
Liquid Crystals Science
and Technology. Section A.
Molecular Crystals and Liquid
Crystals
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The Molecular Structures and
Properties of Anthraquinone-
Type Dichroic Dyes
Hiroki Iwanaga a , Katsuyuki Naito b & Yutaka Nakai a
a Display Materials and Devices Laboratory,
Corporate Research & Development Center , Toshiba
Corp. 1 , Komukai Toshiba-cho, Saiwai-ku, Kawasaki,
212-8582, Japan
b Storage Materials and Devices Laboratory,
Corporate Research & Development Center , Toshiba
Corp. 1 , Komukai Toshiba-cho, Saiwai-ku, Kawasaki,
212-8582, Japan
Published online: 24 Sep 2006.
To cite this article: Hiroki Iwanaga , Katsuyuki Naito & Yutaka Nakai (2001) The
Molecular Structures and Properties of Anthraquinone-Type Dichroic Dyes, Molecular
Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and
Liquid Crystals, 364:1, 211-218, DOI: 10.1080/10587250108024989
To link to this article: http://dx.doi.org/10.1080/10587250108024989
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