Abstract
Equilibrium studies of the mixed-ligand complexes of the copper(II) ion with pentamethyldiethylenetriamine ( N, N, N′, N″, N″-pentamethyl-[bis(2-aminoethyl)amine], Me 5dien) as a primary ligand and methioninehydroxamic acid (2-amino-4-(methylthio)butanehydroxamic acid, Metha) or histidinehydroxamic acid (2-amino-3-(4′-imidazolyl)propanehydroxamicacid, Hisha) as a secondary ligand L were performed by potentiometric titration, UV–Vis and EPR spectroscopy. The results show that in these ternary systems the dinuclear [Cu 2(Me 5dien)L 2H −1] + mixed-ligand species is formed as a predominant one in the basic solution. The monouclear [Cu(Me 5dien)L] + species is formed in low concentration. Our spectroscopic results indicate that the geometry of these mixed-ligand five-coordinate complexes is strongly distorted towards trigonal-bipyramidal.
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