, Cependant, à l'échelle supramoléculaire, deux comportements différents ont été observés en fonction de la concentration de monoamide étudiée (0,5 ou 1,5 mol/L dans l'heptane). Les solutions de monoamide 0,5 mol/L contiennent de larges agrégats polymétalliques. Ils sont constitués de cations uranyles liés entre eux par des nitrates pontants. Le complexe L2UO2(NO3)2 est très peu présent dans ces solutions. Les solutions contenant 1,5 mol/L de monoamide dans l'heptane présentent une organisation très différente, Après extraction de nitrate d'uranyle, les résultats expérimentaux (IR, ESI-MS) n'ont pas montré de différences importantes au niveau moléculaire entre les différentes solutions de monoamide

, Nous avons également étudié une solution de MOEHA dans l'heptane après démixtion de la phase organique suite à l'extraction d'une grande quantité de nitrate d'uranyle. L'étude des phases légère et lourde montre que l'organisation dépend essentiellement de la composition de la phase (concentration de ligand et de cation) plutôt que de l'origine de celle-ci

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