The title compounds, Na[{AmO(2)}(C(2)H(3)O(2))(3)], (I), and (CH(6)N(3))[{AmO(2)}(C(4)H(5)O(2))(3)], (II), contain complex anions in which AmO(2)(2+) cations are surrounded by three bidentate-chelating carboxylate groups. The atoms of the AmO(2) group and the Na atoms in (I) are situated on threefold axes. All the atoms in (II) occupy general positions. Both compounds are isomorphous with earlier studied analogous compounds of previous members of the actinide (An) series.
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