Article ID Journal Published Year Pages File Type
10574287 Journal of Inorganic Biochemistry 2005 11 Pages PDF
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.
Related Topics
Physical Sciences and Engineering Chemistry Inorganic Chemistry
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