Synchrotron-radiation photoemission study of in-situ synthesized DCNQI(N,N′-dicyanoquinonediimine)-Cu salts

Akinori Tanaka, Ashish Chainani, Tatsushi Miura, Takashi Takahashi, Takahumi Miyazaki, Shinji Hasegawa, Takehiko Mori

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14 Citations (Scopus)


A photoemission study using synchrotron radiation of in-situ synthesized organic conductors (DMe-DCNQI)2Cu and (MeBr-DCNQI)2Cu is reported, where DMe-DCNQI and MeBr-DCNQI are dimethyl-N,N′-dicyanoquinonediimine and methyl, bromine-N,N′-dicyanoquinonediimine, respectively. The photon energy dependence of the valence band spectra is used to characterize the origin of the observed features. In both salts, the Cu 3d derived states are situated at 3.5-4 eV binding energy, while the C and N 2pσ states appear around 7.5 eV. The Br 4p states are found around 5 eV in (MeBr-DCNQI)2Cu. The states near the Fermi level have substantial C and N 2pπ character consistent with extended Hückel molecular orbital calculations. The absence of a resonance at the Cu 3p threshold suggests a small contribution of Cu2+ configuration in DCNQI-Cu salts.

Original languageEnglish
Pages (from-to)1-5
Number of pages5
JournalSolid State Communications
Issue number1
Publication statusPublished - 1995 Jan


  • 0511 photoelectron spectroscopy
  • chemical synthesis
  • electronic band structure
  • organic crystals
  • synchrotron radiation


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