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Phys Chem Chem Phys. 2007 Oct 7;9(37):5162-70. Epub 2007 Jul 30.

Characterisation of the supramolecular structure of malonamides by application of pulsed field gradients in NMR spectroscopy.

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CEA Marcoule, DEN/DRCP/SCPS/LCAM, BP17171, 30207, Bagnols sur C├Ęze, France.


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, (1)H 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.

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