Stability constants of binary complexes of some rare earth and nuclear metal ions with some peptides at 0.1 M ionic strength pH-metrically

Interaction of Pm(III), Gd(III), HO(III), Er(III), Ce(IV), Pr(IV), Tb(IV), UO2(II), Th(IV) metal ions with Glycyl- Glycyl-Glycine (L1), L-Alanyl-L-Alanyl-L-Alanine (L2), DL-Alanyl-DL-Phenyl-Alanine (L3) and DL-Alanyl-Glycine (L4) have been studied at 0.1 M ionic strengths [NaClO4, 1 M] pH-metrically. The deviation between ligand curves and free acid curves showed the dissociation of -COOH and -NH3 + group. The deviation between ligand curves and metal curves showed the commencement of complex formation. Proton-ligand stability constant (pK) and metalligand stability constant of the binary complex are evaluated using Irving-Rossotti's expression. Complex systems are carried out by using Calvin-Bjerrum titration method in an inert atmosphere

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