STUDY ON THE FORMATION OF COMPLEXES BETWEEN Pr, Nd AND Sm WITH L-ALANIN AND AXETYL AXETON

Abstract

     The stability constant of the mixed ligand complexes and simple ligand complexes formed between Pr3+, Nd3+, Sm3+ with L-alanin and acetyl acetone were determined by potentionmetric titration in aqueous solution (25  10C, I= 0,1). The complexes following 1:2 proportion have forms of Lnala2+, Ln AcAc2+, Ln(AcAc)2. ,the best formation of complexes occurs in the range of pH from 6 to 8; following 1:1:1 propotion ; 1:2:1 propotion have forms of  LnAcAcala+, Ln(AcAc)2ala, the best formation of complexes occurs in the range of pH from 7 to 9. The mixed ligand complexes  become much stronger than the simple ligand complexes.