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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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

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Electronic states
Organometallics
Gold
Metal insulator boundaries
Electric properties
conductors
Salts
electrical properties
insulators
gold
Ligands
Magnetic variables measurement
electronics
Electronic properties
salts
Cations
ligands
Infrared radiation
Molecules
magnetic measurement

ASJC Scopus subject areas

  • Inorganic Chemistry

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Electrical properties and electronic states of molecular conductors based on unsymmetrical organometallic-dithiolene gold(III) complexes. / Kubo, Kazuya; Nakao, Akiko; Ishii, Yasuyuki; Yamamoto, Takashi; Tamura, Masafumi; Kato, Reizo; Yakushi, Kyuya; Matsubayashi, Gen Etsu.

In: Inorganic Chemistry, Vol. 47, No. 12, 16.06.2008, p. 5495-5502.

Research output: Contribution to journalArticle

Kubo, Kazuya ; Nakao, Akiko ; Ishii, Yasuyuki ; Yamamoto, Takashi ; Tamura, Masafumi ; Kato, Reizo ; Yakushi, Kyuya ; Matsubayashi, Gen Etsu. / Electrical properties and electronic states of molecular conductors based on unsymmetrical organometallic-dithiolene gold(III) complexes. In: Inorganic Chemistry. 2008 ; Vol. 47, No. 12. pp. 5495-5502.
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