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(2R,2′S)-2,2′-oxybis-( N,N -didecylpropanamide) ( cis -mTDDGA) and (2R,2′R)-2,2′-oxybis-( N,N -didecylpropanamide) ( trans -mTDDGA) were studied using time-resolved laser fluorescence spectroscopy (TRLFS), vibronic side-band spectroscopy (VSBS) and density functional theory calculations (DFT) to find reasons for their different extraction properties. Stability constants of the respective Cm(III) and Eu(III) complexes show  cis -mTDDGA to be the superior ligand which is in agreement with results from extraction experiments.  cis -mTDDGA extracts Cm(III) and Eu(III) as 1:3 complexes. In case of  trans -mTDDGA, 1:2 complexes of the form [M( trans -mTDDGA) 2 (η 1 -NO 3 )(H 2 O) 2 ] 2+  (M = Cm, Eu) are extracted additionally to the 1:3 complexes. VSBS and DFT confirm the presence of inner-sphere nitrate in the 1:2 complex.

Spectroscopic investigation of the different complexation and extraction properties of diastereomeric diglycolamide ligands