The stability of hexacyanoferrate(ll)-amine(methylamine, ethylenediamine, diethylenetriamine and tetraethylenepentamine) was determined potentiometrically. Species Fe( CN)6(A )HOj -4) (A = amine) are formed in all the systems investigated, with j = 1 ... n + 2 (n = number of aminogroups). Some other complexes Fe(CN)6(A)iH j (with i > 1) were also found. The stability of these complexes is fairly high: the full protonated amine species, show for the reaction Fe(CN)~- + nnA n§ : Fe(CN)6(A)[-l(nn -n) an equilibrium constant given by logK = 0.686 + 2.1On. Factors affecting the stability are discussed in comparison with similar systems, together with the importance of interferences.
Binding of Hexacyanoferrate(II) by Aliphatic Amines in Aqueous Solution.
DE STEFANO, Concetta;FOTI, Claudia;GIUFFRE', Ottavia
1996-01-01
Abstract
The stability of hexacyanoferrate(ll)-amine(methylamine, ethylenediamine, diethylenetriamine and tetraethylenepentamine) was determined potentiometrically. Species Fe( CN)6(A )HOj -4) (A = amine) are formed in all the systems investigated, with j = 1 ... n + 2 (n = number of aminogroups). Some other complexes Fe(CN)6(A)iH j (with i > 1) were also found. The stability of these complexes is fairly high: the full protonated amine species, show for the reaction Fe(CN)~- + nnA n§ : Fe(CN)6(A)[-l(nn -n) an equilibrium constant given by logK = 0.686 + 2.1On. Factors affecting the stability are discussed in comparison with similar systems, together with the importance of interferences.Pubblicazioni consigliate
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