Electronic properties of new organic conductors based on 2,7-bis(methylthio) 1,6-dithiapyrene (MTDTPY) with TCNQ and p-benzoquinone derivatives.

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概要

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• The electronic properties of charge-transfer (CT) complexes based on a new organic donor MTDTPY with TCNQ and <I>p</I>-benzoquinone derivatives (fluoranil (FLL), chloranil (CHL), bromanil (BRL), and DDQ) have been investigated by means of electrical conductivity, thermoelectric power, ESR, and band calculation. β-MTDTPY–TCNQ, MTDTPY–CHL, and MTDTPY–BRL show a metallic electrical conduction. MTDTPY–CHL and MTDTPY–BRL are the first organic metals among the CT complexes with <I>p</I>-benzoquinone derivatives. The metal–insulator (M-I) transition takes place around 110, 240, and 125 K for β-MTDTPY–TCNQ, MTDTPY–CHL, and MTDTPY–BRL, respectively. The sharp ESR linewidth and large anisotropy of the transfer integral for β-MTDTPY–TCNQ and MTDTPY–CHL suggest a one-dimensional electronic property. Thus, the M-I transition for these complexes is considered to be caused by a Peierls instability. MTDTPY–CHL undergoes a first-order phase transition in the semiconducting phase. This phase transition disappears by applying pressure.

• 公益社団法人 日本化学会の論文

著者

• Mori Takehiko

  Institute for Molecular Science

• Murata Ichiro

  Department Of Cardiovascular Medicine Graduate School Of Medicine

• Inokuchi Hiroo

  Institute For Molecular Science

• IMAEDA Kenichi

  Institute for Molecular Science

• Enoki Toshiaki

  Institute For Molecular Science

• Sasaki Mitsuru

  Department Of Agrobioscience Graduate School Of Agricultural Science Kobe University

• Nakasuji Kazuhiro

  Department Of Chemistry Graduate School Of Science Osaka University

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