Equilibria and Stability in Glycine, Tartrate and Tryptophan Complexes, Investigation on Interactions in Cu(II) Binary and Ternary Systems in Aqueous Solution
The acidity and stability constants of M(Gly)1, M(Ttr)1,
and M(Trp)1 M: Cu2+, Cu(Bpy2)2+,
and Cu(Phen3)2+ complexes, were
determined by potentiometric pH titration. It is shown that the stability of
the binary Cu(L), (L: Gly, Ttr, and Trp) complex is determined by the basicity
of the carboxylate group on one side and amino group on the other side. It is
demonstrated that the equilibrium, Cu(Ha4)2+ + Cu(L) Cu(Har)(L) + Cu2+,
is displacement due to the
well known experience that mixed ligand complexes formed by a divalent 3d ion,
a heteroaromatic N base and
an O donor ligand possess increased stability. The stability constants of the
1:1 complexes formed between Cu2+, Cu(Bpy)2+ or Cu(Phen)2+
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