Abstract
AbstractThe complexation of NpV ions with a tetradentate ligand with oxygen and nitrogen donors, 1,10‐phenanthroline‐2,9‐dicarboxylic acid (denoted as H2L), was studied in aqueous solutions by spectrophotometric and calorimetric methods. NpV ions form a very strong 1:1 complex, NpO2L–, with the stability constant log β = 11.73 ± 0.02 in 0.1 M NaClO4 at 25 °C. It is a much stronger complex than those of NpV ions with related ligands such as picolinic acid or dipicolinic acid, as the higher denticity of 1,10‐phenanthroline‐2,9‐dicarboxylic acid results in a larger entropic effect on the complexation. It is expected that the amide derivatives of 1,10‐phenanthroline‐2,9‐dicarboxylic acid would be excellent extractants in the separation of NpV ions, which are problematic in actinide separation processes owing to their very low extractability by many extractants.
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