Highly conducting 1:1 radical cation salts: (DMTSA)X with X = NO3 and BF4

Kazushige Kawabata, Motoki Yanai, Takashi Sambongi, Yoshio Aso, Kazuo Takimiya, Tetsuo Otsubo

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


(DMTSA)NO3 and -BF4 show high conductivity at room temperature, in spite of fully ionic salt of 1:1 stoichiometry with uniform segregated stack column structure. DMTSA denotes 2,3-dimethyltetraseleno-anthracene. The NO3 salt is semiconducting below room temperature, and the BF4 salt is metallic above 220 K and semiconducting at lower temperatures. We found that their magnetic susceptibility is paramagnetic and independent of temperature from 300 K down to 10 K in common. The obtained magnetic property can not be attributed to conduction electrons but discussed in terms of Mott insulating state. Furthermore, high pressure experiment reveals that the NO3 salt is not semiconducting but rather semi-metallic, and more that the BF4 salt shows a small conductive anomaly around 70 K and maintains metallic at low temperatures under the pressure of 0.5 GPa.

Original languageEnglish
Pages (from-to)197-204
Number of pages8
JournalMolecular Crystals and Liquid Crystals
Publication statusPublished - 1997


  • Electron correlation
  • Magnetic property
  • Mott insulator
  • Organic metal


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