Electronic structures of quasi-one-dimensional halogen-bridged Ni(III) complexes with strong electron-correlations

M. Yamashita, T. Manabe, T. Kawashima, H. Okamoto, H. Kitagawa

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

In the quasi-one-dimensional halogen-bridged metal complexes, the Pt and Pd compounds have charge density wave (CDW) states or the M(II)-M(IV) mixed-valence states where the bridging halogens are distorted from the midpoints between neighboring two metal ions due to the stronger electron-phonon interaction. However, Ni compounds have spin density wave (SDW) states or the M(III) states where the bridging halogens are located at the midpoints between neighboring two metal ions, due to the stronger electron-correlation. These Ni compounds are not Mott-insulators but charge-transfer-insulators. The electronic structures in [Ni(III)(chxn)2X]Y2 (chxn=cyclohexanediamine; X=Cl, Br and mixed-halides; Y=Cl, Br, mixed-helides, NO3, ClO4 and BF4) are tuned by substituting the bridging halogens and counteranions. The competition between the SDW states in Ni(III) sites and the CDW states in Pd(II)-Pd(IV) sites in the Ni-Pd mixed-metal compounds, Ni(l-χ)Pd(χ)(chxn)2Br3, has been investigated. The Pd(II)-Pd(IV) states are approaching the Pd(III) states with increase of the Ni components in this system due to the stronger electron-correlation in Ni(III) sites. (C) 1999 Elsevier Science S.A.

Original languageEnglish
Pages (from-to)309-330
Number of pages22
JournalCoordination Chemistry Reviews
Volume190-192
DOIs
Publication statusPublished - 1999 Dec 1
Externally publishedYes

Keywords

  • Charge density wave
  • MX-chains
  • Peierls-Hubbard model
  • Spin density wave

ASJC Scopus subject areas

  • Chemistry(all)
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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