Abstract
Equilibria occurring between glycine (L) and magnesium(II) and calcium(II) were studied by measuring at 25 °C the electromotive force (e.m.f.) of the cell: (−) Pt, H2/SolutionS/R.E. (+) where R.E. is the reference electrode described in the text.
Equilibria taking place in solutions containing iron(II) and glycine were investigated by means of the cell: (−) R.E./SolutionS/G.E. (+) where G.E. is the glass electrode. The general composition of solutionS was in both cases the following:
B M inM 2+;H M in H+;A M inL; 3.00M in ClO −4 ; (3-H-2B)M in Na+.
Experimental data were explained by assuming the existence of the species:: MgL(log β1,0,1=1.53±0.05); MgL 2(log β2,0,1=2.26±0.05); CaL(log β1,0,1==0.75±0.03); FeL(log β1,0,1=4.20±0.04).
Protonation constants of aminoacetate, not known in the experimental conditions selected, were determined by means of e.m.f. measurements carried out with a H2 electrode.
Zusammenfassung
Die Gleichgewichte zwischen Glycin (L) und Magnesium(II) bzw. Calcium(II) wurden bei 25 °C durch E.M.K. Messungen der folgenden Meßkette untersucht: (−) Pt, H2/ProbenlösungS/R.E. (+) wobei R.E. Referenz-Elektrode bedeutet (siehe Text).
Zum Studium der Reaktion zwischen Eisen(II) und Glycin bei 25 °C wurde folgende Meßkette benutzt: (−) R.E./ProbenlösungS/G.E. (+) wobei G.E. Glas-Elektrode bedeutet.
Alle Meßproben hatten die folgende allgemeine Zusammensetzung:B M inM 2+;H M in H+;A M inL; 3,00M in ClO −4 ; (3-H-2B)M in Na+.
Die experimentellen Daten konnten unter Annahme folgender Komplexe erklärt werden: MgL(log β1,0,1=1,53±0,05); MgL 2(log β2,0,1=2,26±0,05); CaL(log β1,0,1=0,75±0,03); FeL(log β1,0,1=4,20±0,04). Die Protonierungskonstanten von Aminoacetat, die bei den gewählten experimentellen Bedingungen nicht bekannt sind, wurden mittels E.M.K. Messungen (mit Wasserstoff-Elektrode) bestimmt.
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Bottari, E., Porto, R. Complex formation between glycine and magnesium (II), calcium(II), and iron(II) at 25 °C in 3.00M NaClO4 . Monatsh Chem 113, 1245–1252 (1982). https://doi.org/10.1007/BF00808739
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DOI: https://doi.org/10.1007/BF00808739