Abstract
Abstract Formation equilibria of ternary copper(I)-macrocyclic triamine ([11]aneN3, [12]aneN3, iso[12]aneN3, and [12]aneN3S) complexes with monodentate π-ligand (SCN−, CH3CN, or imidazole) were studied by the polarographic method. The copper(I)-macrocyclic triamine complexes in solutions containing an excess monodentate π-ligand were found to produce a polarogram consisting of two separate reduction steps of equal height. The chemical equilibria for the formation of the 1 : 1 : 1 ratio copper(I) mixed ligand complexes including macrocyclic triamine and π-ligand were determined by studying the effects of solution pH and concentrations of macrocyclic triamine and π-ligand on the half-wave potential of the 2nd reduction step, which appears at more negative potentials. The eleven-membered macrocyclic triamine, [11]aneN3, forms the most thermodynamically stable copper(I) mixed ligand complex, [CuIL(A)]1−b. The formation constants for 1 : 1 : 1 ratio copper(II), macrocyclic triamine, and monodentate π-ligand were determined potentiometrically by studying the effects of SCN−, CH3CN, or imidazole concentration on the formation equilibrium of copper(II)-macrocyclic triamine complexes.
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