Complex formation equilibria in iron(III)-L-alanine system |
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Authors: | Predrag Djurdjević Ratomir Jelić |
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Affiliation: | (1) Faculty of Science, Institute of Chemistry, P.O. Box 60, 34000 Kragujevac, Yugoslavia |
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Abstract: | Summary Complex formation in iron(III)-L-alanine solutions was studied by emf glass electrode and spectrophotometric measurements, in 0.5 mol dm –3 (Na)NO3 medium, at 25 ° C. In the concentration range 0.5 [Fe]0 20.0, 5.0 [Ala]0 1000.0 (mmol dm–3) and 1.0 -log [H+] 3.5; {[Ala]/[Fe] = 10:1-100:1| the equilibria in the title system were explained by the model including the species FeHL, FeL, Fe(OH)L, Fe2(OH)2L2 (where HL denotes L-alanine) and several hydrolytic products. The stability constants of complexes are given. The mechanism of formation and structure of complexes in solution is proposed.Abbreviations Ala alaninate ion - HAla alanine (zwitterion) - AlaH alanine (neutral) - H2Ala+ alanine cation |
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