Abstract
Two new Np(V) malonates, LiNpO2L·2H2O and KNpO2L, where L = CH2(COO)2, were synthesized, and their characteristics were studied. Similar to their chemical analogs with Na+, NH4+, and Cs+ ions in the outer sphere, these compounds transform into well crystallized neptunyl(V) compounds of the MNpO2CO3·nH2O type on heating in sealed ampules beneath the layer of the corresponding alkali metal or ammonium malonate solution at a temperature higher than 140°C. Under hydrothermal conditions (NpO2)2L·4H2O is not converted to lower hydrates, and above 135°C it decomposes to form a dark gray amorphous product.
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