Uranyl complexes of n-alkanediaminotetra-acetic acids

The uranyl complexes of n-propanediaminetetra-acetic acid, n-butanediaminetetra-acetic acid and n-hexanediaminetetra-acetic acid have been studied by potentiometry, with computer evaluation of the titration data by the MINIQUAD program. Stability constants of the 1:1 and 2:1 metal:ligand chelates have been determined as well as the respective hydrolysis and polymerization constants at 25° in 0.10 M and 1.00 M KNO 3 . The influence of the length of the alkane chain of the ligands on the complexes formed is discussed.