Equilibrium studies on some binary complexes of La(III), Ce(III), Pr(III) and Nd(III) with ligands containing N-N donor atoms

The present paper describes a potentiometric study on formation constants of binary complexes of inner transition "4f" metal ions La(III), Ce(III), Pr(III) and Nd(III) with amines such as ethylene-diamine, N-N-dimethyl ethylenediamine, N-N-diethyl ethylene-diamine, 1,2-diaminopropane and 1,3-diaminopropane carried out at constant temperature 30 +/-0.1 degreesC and ionic strength mu =0.2 M dm(-3) (NaClO4). Various factors influencing the formation and stabilities of binary complexes have been discussed.