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A series of isostructural compounds of the composition Na7H[EMo12O42]·12H2O, where E(IV) = Ce, Th, U, Np, or Pu, were synthesized and structurally characterized. In the [EMo12O42]8– heteropolyanion (HPA), the central E(IV) atom is surrounded by six Mo2O9 groups, each constituted by two octahedra sharing a common face. The coordination polyhedron (CP) of the central atom is a weakly distorted icosahedron...
The structure of new mixed-valent An(IV)/Np(V) compounds [An(NpO2)(H2O)3(CBr3COO)5]·CBr3COOH·nH2O, where An(IV) = Th and Np, was studied. Two independent Np(V) atoms have the coordination surrounding in the form of pentagonal bipyramids with the O atoms of NpO 2+ dioxocations in apical positions; the equatorial planes of the bipyramids are constituted by the O atoms of five CBr3COO− ions. Two independent...
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