Copper(II) complexes of diamino diamide and diamino diamine in aqueous solution

In order to study the difference on the equilibrium, spectral properties of copper(II) complexes of diamino diamide and diamino diamine, new tetradent ate ligands, 4,7-dimethyl-4,7-diazadecanediamide (4,7-N,N'-Me-2-L-2,2,2) an d 1,10-diamino-4,7-dimethyl-4,7-diazadecane (4,7-N,N'-Me-2-3,2,3-tet), have been synthesized. Synthetic procedures for these new ligands are described . Their protonation constants have been determined potentiometrically in 0. 10 M KCl at 25.0 degrees C. The formation of their copper(II) complexes hav e been investigated quantitatively by the potentiometric technique and by t he measurement of their electronic spectra.