Proton Transfer and a Dielectric Phase Transition in the Molecular Conductor (HDABCO+)2(TCNQ)3

Tomoyuki Akutagawa, Sadamu Takeda, Tatsuo Hasegawa, Takayoshi Nakamura

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132 Citations (Scopus)


One-dimensional dielectric (N⋯H⋯N) hydrogen-bonding chains of monoprotonated 1,4-diazabicyclo[2.2.2]octane (HDABCO+) were introduced into an electrically conducting 7,7,8,8-tetracyano-p-quinodimethane (TCNQ) salt as the countercation structure. Room-temperature electrical conductivity was ∼10-3 S cm -1, with a semiconductive behavior. The temperature-dependent dielectric constants of (HDABCO+)2(TCNQ)3 indicated a dielectric transition at 306 K. A large deuterium isotope effect for the dielectric transition (ΔT = 70 K) was observed for the deuterated salt, (DDABCO+)2(TCNQ)3. Thermally activated order/disorder of the protons or deuteriums within the one-dimensional hydrogen-bonding chains of (HDABCO+) and (DDABCO+) affected the dielectric responses in the TCNQ-based semiconductors.

Original languageEnglish
Pages (from-to)291-294
Number of pages4
JournalJournal of the American Chemical Society
Issue number1
Publication statusPublished - 2004 Jan 14
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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