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

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Abstract

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
Volume99
Issue number8
DOIs
Publication statusPublished - Aug 2005

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Titration
Mass spectrometry
Zinc
Copper
Electrospray ionization
Riboflavin
Spectrophotometry
Cyclic voltammetry
Superoxide Dismutase
Ionization
Metal ions
Paramagnetic resonance
Assays
Desorption
Molecular weight
Ligands
Electrospray Ionization Mass Spectrometry
Lasers
Electron Spin Resonance Spectroscopy
Mass Spectrometry

Keywords

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

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry

Cite this

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title = "Speciation study of an imidazolate-bridged copper(II)-zinc(II) complex in aqueous solution",
abstract = "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.",
keywords = "Imidazolate-bridged complex, Mass spectrometry, Riboflavin/NBT assay, Solution equilibrium, Superoxide dismutase (SOD) mimic",
author = "I. Szil{\'a}gyi and I. Lab{\'a}di and K. Hern{\'a}di and I. P{\'a}link{\'o} and N. Nagy and L. Korecz and A. Rockenbauer and Z. Kele and T. Kiss",
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T1 - Speciation study of an imidazolate-bridged copper(II)-zinc(II) complex in aqueous solution

AU - Szilágyi, I.

AU - Labádi, I.

AU - Hernádi, K.

AU - Pálinkó, I.

AU - Nagy, N.

AU - Korecz, L.

AU - Rockenbauer, A.

AU - Kele, Z.

AU - Kiss, T.

PY - 2005/8

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N2 - 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.

AB - 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.

KW - Imidazolate-bridged complex

KW - Mass spectrometry

KW - Riboflavin/NBT assay

KW - Solution equilibrium

KW - Superoxide dismutase (SOD) mimic

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