Physical properties of quasi-one-dimensional charge-transfer metal complexes;[M(HBQD)2]TCNQ (M=Ni, Pd; H2BQD=1,2-benzoquinonedioxime)

Yuka Kagami, Fumiyasu Iwahori, Tachi Ohishi, Tetsuo Hama, Toshio Manabe, Masahiro Yamashita, Hiroshi Kitagawa, Ken Ichi Sakai, Tadaoki Mitani

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3 Citations (Scopus)


We have investigated the physical properties of [M(HBQD)2]TCNQ (M=Ni, Pd; H2BQD=1,2-benzoquinonedioxime) which consist of alternating -D-A-D-A-type stackings of transition-metal-complex donors and organic TCNQ acceptors. The degree of charge-transfer for each sample was estimated to be -0.1 from the results of IR, Raman spectra, and bond length of TCNQ. From XPS measurements, the valence state of Ni or Pd was found to be transformed at low temperature from +II to the mixed valency of +II,+III or +II,+IV, respectively. This behavior can be considered to be due to the charge-transfer from d-orbital of the transition metal to π-antibonding orbital of the HBQD ligands, which was confirmed by the lower-energy shift of IR stretching modes of C=N in HBQD. This temperature-induced charge-transfer between transition metal and ligand is the first observation in the transition-metal-complex assemblies.

Original languageEnglish
Pages (from-to)1803-1804
Number of pages2
JournalSynthetic Metals
Issue number1-3
Publication statusPublished - 1997 Feb 28
Externally publishedYes


  • Benzoquinonedioxime
  • Charge-transfer salt
  • Infrared and raman spectroscopy
  • Photoelectron spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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