Observation of Dynamic Behavior of Self-Assembled <i>N</i>-Icosyl-Substituted Indigo by STM

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  • Kazuki Urano
    Department of Chemistry, Faculty of Science, Tokyo University of Science
  • Toshikazu Ohno
    Department of Chemistry, Faculty of Science, Tokyo University of Science
  • Kazuaki Tomono
    Department of Material Chemistry, Graduate School of Science and Engineering, Yamaguchi University
  • Kazuo Miyamura
    Department of Chemistry, Faculty of Science, Tokyo University of Science

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<jats:title>Abstract</jats:title> <jats:p>Indigo dye molecules substituted by hexadecyl (C16IND) and icosyl (C20IND) chains were prepared. Crystallographic analysis revealed that C16IND tends to form lamellar structure constituted of dimers. Scanning tunneling microscopy (STM) also revealed that two-dimensional (2D) lamellar structure constituted of C16IND and C20IND dimers were formed at the surface as in crystal. Two different homochiral domains (λ- or δ-domain) could be distinguished by the relative orientation to underlying substrate, and there was a “mosaic region” composed of a number of small (λ/δ)-grains in the self-assembly. Furthermore, time-dependent STM observation for C20IND showed that the interconversion between grains of opposite chirality proceeded in the mosaic region while frustrated at the boundary between ordered chiral domains of opposite chirality.</jats:p>

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