Speciation study of an imidazolate-bridged copper(II)-zinc(II) complex in aqueous solution

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The solution equilibrium and the binding mode of the species in the five-component system containing two metal ions (copper(II) and zinc(II)) and three ligands (A = diethylenetriamine, B = imidazole, C = tris(2-aminoethyl) amine) were investigated by pH-potentiometric titration, UV-visible spectrophotometry and EPR (electron paramagnetic resonance) spectroscopic titration in aqueous solution in the 2-11 pH range. An imidazolate-bridged heterobinuclear complex (ACuBH-1ZnC) was found to evolve above pH = 7 and was stable between pH 7 and 11. The existence of the ACuBH-1ZnC complex (by determination of its molecular weight) was proved by mass spectrometry (ESI-MS (electrospray ionization mass spectrometry) and MALDI (matrix-assisted laser desorption/ionization) techniques). The electrochemical behaviour and the superoxide dismutase activity of this complex were also tested by cyclic voltammetry and the Riboflavin/NBT (nitro blue tetrazolium) assay, respectively.

Original languageEnglish
Pages (from-to)1619-1629
Number of pages11
JournalJournal of Inorganic Biochemistry
Issue number8
Publication statusPublished - Aug 1 2005


  • Imidazolate-bridged complex
  • Mass spectrometry
  • Riboflavin/NBT assay
  • Solution equilibrium
  • Superoxide dismutase (SOD) mimic

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry

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