Electrical properties and electronic states of molecular conductors based on unsymmetrical organometallic-dithiolene gold(III) complexes

Kazuya Kubo, Akiko Nakao, Yasuyuki Ishii, Takashi Yamamoto, Masafumi Tamura, Reizo Kato, Kyuya Yakushi, Gen Etsu Matsubayashi

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13 Citations (Scopus)

Abstract

The electronic properties of cation radical salts derived from organometallic mixed-ligand complexes [(ppy)Au(S-S)] (ppy- = C-dehydro-2-phenylpyridine(-); S-S2- = dithiolene ligand) with Au(III)-C σ-bond were investigated. A 2:1 salt complex [(ppy)Au(C 8H4S8)]2[PF6] (C 8H4S82- = 2-{(4,5-ethylenedithio)-1, 3-dithiole-2-ylidene}-1,3-dithiole-4,5-dithiolate(2-)) exhibited semiconductive behavior under ambient pressure (ρrt = 2.6 Ω cm, E a = 0.03 eV). Magnetic measurements show that it is a Mott insulator close to the metal-insulator boundary. Raman and infrared spectra have revealed that the complex has a quasi-one-dimensional dimeric structure consisting of uniformly charged donor molecules. The complex exhibits metallic behavior at pressures above 0.8 GPa. In contrast, a similar compound [(ppy)Au(C 8H4S6O2)]2[BF 4] (C8H4S6O22- = 2-{(4,5-ethylenedioxy)-1,3-dithiole-2-ylidene}-1,3-dithiole-4,5-dithiolate(2- )) is a band insulator.

Original languageEnglish
Pages (from-to)5495-5502
Number of pages8
JournalInorganic Chemistry
Volume47
Issue number12
DOIs
Publication statusPublished - 2008 Jun 16
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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