Haldane gap systems

Masahiro Yamashita, Tomohiko Ishii, Hiroyuki Matsuzaka

Research output: Contribution to journalReview articlepeer-review

56 Citations (Scopus)


Haldane gap compounds with S = 1 formulated as [Ni(AA)2X]Y ((AA)2 = (diamines)2, linear-tetramines, N4-macrocycles; X = NO2 and N3; Y = ClO4, BF4 and PF6) and (CH3)4N[Ni(NO2)3], and with S = 2 formulated as [Mn(AA)2Cl3] (AA = bipy and phen) are described. They have one-dimensional structures with bridging ligands. The Haldane conjecture was proven by magnetic susceptibility and high-field magnetization measurements. The magnitudes of the Haldane gap with S = 1 can be controlled by combination of the bridging ligands, in-plane ligands, and counteranions as follows: X, N3 > NO2; AA, en ≥ tn > linear-tetramines > dmpn > Me6[14]aneN4; ≧ [15]aneN4; Y, ClO4 > PF6. In spite of a similar structure to Haldane gap compounds, the [Ni([15]aneN4)N3]PF6 and [Ni(en)2(NO2)]BF4 species show spin-glass behavior, which is very novel in one-dimensional spin systems. The [Mn(bipy)Cl3] is regarded as the first example of the Haldane gap system with S = 2.

Original languageEnglish
Pages (from-to)347-366
Number of pages20
JournalCoordination Chemistry Reviews
Issue number1
Publication statusPublished - 2000 Jan 1
Externally publishedYes


  • Haldane gap
  • One-dimensional Heisenberg antiferromagnet
  • One-dimensional Mn compounds
  • One-dimensional Ni compounds

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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