Malonamides are known and extensively studied for their lanthanide and actinide extracting properties. Those studies have also highlighted aggregated phenomena and a splitting of the organic phase, in some particular experimental conditions. To explain this behaviour of extractants, 1H NMR was used to study micellar phenomena by the determination of the self-diffusion coefficients of two malonamides only different by the length of their alkyl chain (DMDBTDMA and DMDBPMA), in presence of n-dodecane and for systems saturated with water or anhydrous. Several information on the aggregates and on the malonamide supramolecular structure were obtained by fitting the curves of self-diffusion coefficient vs. concentration and by conjugated NMR experimental data to potentiometric titrations and physical measurements.
