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.