Summary
Acidity (dehydronation) constants of N,N-dimethylthreonine (DMT) and stability constants of its complexes with Cu+2, Ni+2, and Co+2 were determined in aqueous solution by means of potentiometric titration. UV/Vis spectra were also taken during the titration. It is suggested thatDMT acts as a bidentate ligand toward copper(II) by engaging either (a) amino and carboxyl groups (in [Cu(DMT)] and [Cu(DMT)2]), or, (b) upon dehydronation, amino and hydroxyl groups (in [Cu(DMT)H−1], [Cu(DMT)2H−1], and [Cu(DMT)2H−2]). It is suggested that the coordination in threoninato andallo-threoninato complexes is similar to that described under (a).
Zusammenfassung
Dehydronierungskonstanten des N,N-Dimethylthreonins(DMT)sowie die Stabilitätskonstanten seiner Komplexe mit Co+2, Ni+2 und Cu+2 in wässriger Lössung wurden mittels potentiometrischer Titration bestimmt. Auch UV/Vis Spektren wurden während der Titration aufgenommen. Die Daten zeigen, daß in den [Cu(DMT)]- und [Cu(DMT)2]-Komplexen die Amino- und Carboxylgruppen koordiniert sind, während in den dehydronierten Komplexen ([Cu(DMT)H−1],[Cu(DMT)2H−1] und [Cu(DMT)2H−2]) die Donorgruppen-NH2 und -OH sind.
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Based upon Master of Science thesis submitted to the University of Zagreb, Croatia byB. Blagović
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Blagović, B., Paulić, N., Raos, N. et al. Transition metal complexes of N,N-dimethylthreonine: Stability and UV/Vis spectra. Monatsh Chem 125, 1083–1089 (1994). https://doi.org/10.1007/BF00811516
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DOI: https://doi.org/10.1007/BF00811516