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A sharp J-band-like electronic absorption peak observed for the chromonic liquid crystal of bisazo dye Ponceau SS in water

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Abstract

The bisazo dye Ponceau SS forms an acute oblique (V-type) dimer in dilute aqueous solution. In concentrated aqueous solution, these V-type dimers are considered to stack to form V-type blocks of chromonic liquid-crystalline (LC) columns. The weak interactions among these LC columnar V-type blocks have been spectroscopically investigated. On increasing the concentration of Ponceau SS at 25 °C, the V-type LC columnar blocks form a rhombus-type LC columnar block at 2 wt% concentration. These rhombus-type LC columnar blocks are further aligned at an acute angle at 5 and 10 wt% concentrations. The rapidly cooled 10 wt% LC sample shows an unusually sharp J-band-like peak in the electronic absorption spectrum. The emergence of this J-band-like peak has been analyzed from the viewpoint of an exciton model, suggesting that many nearest neighbor unique molecules belonging to many different rhombus-type LC columnar blocks are aligned in a head-to-tail manner to give a giant quasi-linear head-to-tail-type exciton.

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Authors and Affiliations

  1. Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, Sagamihara, Kanagawa, 252-5258, Japan

    Michio Kobayashi, Yasuhiro Kasahara & Toshihiko Hoshi

  2. Department of Chemistry, Technological University of Nagaoka, Nagaoka, Niigata, 940-2188, Japan

    Shin-ichi Komiya & Toshiaki Maruyama

Authors
  1. Michio Kobayashi
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  2. Shin-ichi Komiya
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  3. Toshiaki Maruyama
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  4. Yasuhiro Kasahara
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  5. Toshihiko Hoshi
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Correspondence to Michio Kobayashi.

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Kobayashi, M., Komiya, Si., Maruyama, T. et al. A sharp J-band-like electronic absorption peak observed for the chromonic liquid crystal of bisazo dye Ponceau SS in water. Monatsh Chem 142, 997–1003 (2011). https://doi.org/10.1007/s00706-011-0591-6

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  • DOI: https://doi.org/10.1007/s00706-011-0591-6

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