TERNARY COMPLEXES .4. EQUILIBRIUM STUDY OF THE MIXED COMPLEXES OF URANYL-ION WITH PYRIDINE DICARBOXYLIC AND ALIPHATIC DICARBOXYLIC-ACIDS

The stability constants of mixed pyridine dicarboxylic-dicarboxylic acid complexes of uranyl ion have been determined at 30°C and ionic strength μ = 0.1 M(NaCLO4). The pyridine dicarboxylic used is quinolinic the dicarboxylic acids are malonic, succinic, itaconic, glutaric and adipic acid. In all these systems the ternary complexes were more stable than the corresponding binary complexes. The stabilities of the ternary complexes depend on the nature of the donor atoms, size of the chelate ring and steric hindrance in one of the binary complexes. © 1979.