Potentiometric and spectral studies of complex formation of La(III), Pr(III) and Lu(III) with aspartic acid and asparagine
1987
The composition and stability of La3+, Pr3+ and Lu3+ complexes with aspartic acid and asparagine were analysed. The formation of complexes of the typeML andMHL was determined for La3+ and Pr3+ with aspartic acid, and of the typeMHL for Lu3+ with aspartic acid. For La3+, Pr3+ and Lu3+ with asparagine the formation ofML(OH) complexes was observed. By means of1H NMR and13C NMR studies the participation in the coordination of both -COOH groups was determined for aspartic acid, whereas for asparagine the participation of the -COOH group was determined in complexes with La3+, Pr3+, and of the -COOH and the -NH2 groups in the complex with Lu3+.
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