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

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

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
Volume32
Issue number4 R
DOIs
Publication statusPublished - 1993 Apr

Keywords

  • Computer simulation
  • Electrostatic interaction
  • Molecular arrangement
  • Organic molecule
  • Polar liquid Crystal
  • STM

ASJC Scopus subject areas

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

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