Observation of Molecular Layers in (2-(4,5-bis(thiomethyl)-1,3-dithiol-2-ylidene)-5-(4,5-ethylenedithio-1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene)(TMET-TTP) Single Crystals by Means of Scanning Tunneling Microscopy.

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  • Takahashi Teruo
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O–okayama, Meguro–ku, Tokyo 152, Japan
  • Mori Takehiko
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O–okayama, Meguro–ku, Tokyo 152, Japan
  • Ishikawa Ken
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O–okayama, Meguro–ku, Tokyo 152, Japan
  • Takezoe Hideo
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O–okayama, Meguro–ku, Tokyo 152, Japan
  • Fukuda Atsuo
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O–okayama, Meguro–ku, Tokyo 152, Japan
  • Misaki Yohji
    Department of Molecular Engineering, Kyoto University, Yoshida, Sakyo–ku, Kyoto 606–01, Japan
  • Yamabe Tokio
    Department of Molecular Engineering, Kyoto University, Yoshida, Sakyo–ku, Kyoto 606–01, Japan

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Scanning tunneling microscope (STM) observation has been made on single crystals of (TMET-TTP) xA (TMET-TTP: 2-(4, 5-bis(thiomethyl)-1, 3-dithiol-2-ylidene)-5-(4, 5-ethylenedithio-1, 3-dithiol-2-ylidene)-1, 3, 4, 6-tetrathiapentalene), where A is PF6, ReO4, AuI2 or ClO4. The STM images with molecular resolution were observed in the conducting bc-plane, and were in accord with the results of X-ray observation. The S atoms in the thiomethyl groups are concluded to be responsible for the bright spots. The structural distortion in the ClO4 salt as indicated by X-ray analysis was observed as domain structures of about 100 nm× 100 nm area, though direct observation of different molecular alignments due to different space groups could not be made.

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