Microscopic evidence of a metallic state in the one-pot organic conductor ammonium tetrathiapentalene carboxylate

Toshikazu Nakamura, Ko Furukawa, Takeshi Terauchi, Yuka Kobayashi

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1 Citation (Scopus)

Abstract

1H NMR (nuclear magnetic resonance) and high-field ESR (electron spin resonance) measurements were carried out for self-doped organic conductors in the ammonium tetrathiapentalene carboxylate (TTPCOO)2[(NH41+)1-x(NH30)x ] system. While the pristine TTPCOOH molecule is closed-shell, self-doped carriers are generated by substitution of the carboxyl proton by (NH30) and (NH41+), which can be regarded as a charge reservoir. The π-extended system TTPCOO has a uniaxial g -tensor, indicating a 2D isotropic structure such as a herring-bone-like or parallel cross donor arrangement. The NMR-relaxation rate indicated the Korringa relation in the temperature dependence, and the ESR linewidth followed the Elliot mechanism. Both of these observations provide supporting evidence for a stable metallic state. In this paper, we introduce self-doped organic conductors as a branch of materials design, and emphasize that advanced magnetic resonance measurements are powerful tools for developing functional materials.

Original languageEnglish
Pages (from-to)480-484
Number of pages5
JournalPhysica Status Solidi - Rapid Research Letters
Volume9
Issue number8
DOIs
Publication statusPublished - 2015 Aug 1
Externally publishedYes

Keywords

  • (TTPCOO)<inf>2</inf>NH<inf>4</inf>
  • Electron spin resonance
  • Nuclear magnetic resonance
  • Organic conductors
  • Self-doping

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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