Binding of hexacyanoferrate(II) by aliphatic amines in aqueous solution |
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| Authors: | Concetta De Stefano Claudia Foti Ottavia Giuffré |
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| Institution: | (1) Dipartimento di Chimica Inorganica, Analitica e Struttura Molecolare dell'Università, Salita Sperone 31, 98166 S. Agata di Messina, Italy |
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| Abstract: | The stability of hexacyanoferrate(II)-amine(methylamine, ethylenediamine, diethylenetriamine and tetraethylenepentamine) was determined potentiometrically. Species Fe(CN)6(A)H
j
(j–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)iHj (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)6
4- + HnAn+ = Fe(CN)6(A)Hn
(n-4) an equilibrium constant given by logK=0.686+2.10n. Factors affecting the stability are discussed in comparison with similar systems, together with the importance of interferences. |
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| Keywords: | Hexacyanoferrate(II) complexes polyamine complexes complex formation in aqueous solution anion coordination chemistry ligand-ligand interactions formation constants |
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