Complexation of Am(III) and Eu(III) with DRAPA ( N , N -dialkyl-6-amide-pyridine-2-carboxylic acid).

The similarity of the coordination chemistry of Am(III) and Eu(III) and two homologous tridentate ligands, N , N -di-2-ethylhexyl-6-amide-pyridine-2-carboxylic acid (DEHAPA, HL') in solvent extraction and N , N -dimethyl-6-amide-pyridine-2-carboxylic acid (DMAPA, HL) in aqueous solution and in the solid state, is revealed structurally and spectroscopically with complexes ML' 3 (org), ML 3 (aq) and ML 3 (s), respectively.