Observation of Dynamic Behavior of Self-Assembled N-Icosyl-Substituted Indigo by STM

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 const...

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Bibliographic Details
Published in:Bulletin of the Chemical Society of Japan 2013, Vol.86 (1), p.159-165
Main Authors: Urano, Kazuki, Ohno, Toshikazu, Tomono, Kazuaki, Miyamura, Kazuo
Format: Article
Language:English
Subjects:
Chirality
Dimers
Indigo
Lamellar structure
Mosaics
Scanning tunneling microscopy
Self assembly
Two dimensional
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Summary: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.
ISSN:0009-2673
1348-0634
DOI:10.1246/bcsj.20120240