Crystal structure and electrochemical properties of CuII complexes with 1,2-bis(2-hydroxybenzamido)benzene

Yukinari Sunatsuki, Ryoko Hirata, Yuri Motoda, Masaaki Nakamura, Naohide Matsumoto, Fumiaki Kai

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The tetramethylammonium and potassium salts of [1,2-bis(2-oxybenzamidato)benzene]copper(II) abbreviated as [NMe4]2[Cu(hbab)] and K2[Cu(hbab)] were prepared and characterized. The x-ray analysis of the potassium salt, K2[Cu(hbab)]·5DMF, revealed a unique one-dimensional chain structure consisting of {[KO3][K(Cu(hbab)O]}n as the resulting unit, where each K+ ion is surrounded octahedrally by six oxygen atoms and all the oxygen atoms play the role of a bridging group to the K+ ion. The tetramethylammonium salt, [NMe4]2[Cu(hbab)]·H2O, behaves as a 2 : 1 electrolyte in the 10-3 mol dm-3 solutions of methanol, acetonitrile and DMF, while the potassium salt behaves as a 2 : 1 electrolyte in methanol and as a 1 : 1 electrolyte in acetonitrile and DMF. The CuII/III redox potentials of the tetramethylammonium salt in DMF under the presence of 2 equivalent molar of K+, Na+, and Li+ shift to more positive values than those without alkali metal ions, where the magnitude of the positive shift increases with increasing of charge density of alkali metal ion, namely Li+ > Na+ > K-. The charge effect due to ion pair formation between [Cu(hbab)]2- and Na+ or K+ causes the potential shift, while the potential shift in the case of the Li+ ion is brought about by the decrease of donor ability of the phenolic oxygens, besides the charge effect.

Original languageEnglish
Pages (from-to)4105-4111
Number of pages7
Issue number23
Publication statusPublished - Sept 1997
Externally publishedYes


  • Counter cation effect
  • Crystal structure
  • Electrochemical property
  • Ion pair formation
  • Solvent effect

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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