Scanning tunneling microscope observation of a polar liquid crystal and its computer simulation

Kazumi Matsushige, Seiji Taki, Hirotaka Okabe, Yasuo Takebayashi, Kouichi Hayashi, Yuji Yoshida, Toshihisa Horiuchi, Kazuhiro Hara, Kenji Takehara, Kazuaki Isomura, Hiroshi Taniguchi

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15 Citations (Scopus)


The scanning tunneling microscope (STM) constructed in the laboratory was utilized to observe the molecular arrangement of a new type of liquid crystalline molecule, 5-(p-dodecyloxyphenyl)pyrazine-2-carbonitrile (DOPPC), which has large dipole moments along the molecular axis. The DOPPC molecules adsorbed on a graphite substrate showed several different STM images with regular two-dimensional molecular arrays. They revealed a novel inter-digitated double-row structure, differing from the single-row and the double-row structures proposed for the STM images of cyanobiphenyl liquid crystals. Moreover, a computer calculation was conducted based on electrostatic multipole-multipole interaction and simulated the most energetically preferable molecular arrangement, which agreed well with the observed STM image.

Original languageEnglish
Pages (from-to)1716-1721
Number of pages6
JournalJapanese journal of applied physics
Issue number4 R
Publication statusPublished - Apr 1993

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)


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