Sodium tris(acetato-κ²O,O′)dioxidoamericate(VI) and guanidinium tris(cyclopropanecarboxylato-κ²O,O′)dioxidoamericate(VI)

The title compounds, Na[{AmO₂}(C₂H₃O₂)₃], (I), and (CH₆N₃)[{AmO₂}(C₄H₅O₂)₃], (II), contain complex anions in which AmO₂²⁺ cations are surrounded by three bidentate-chelating carboxylate groups. The atoms of the AmO₂ 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.