Crystal Structure of a Double Oxalate of Np(V) and Co(NH3) 6 3+ , Co(NH3)6NpO2(C2O4)2·1.5H2O

Abstract

The crystal structure of a dioxalate complex Co(NH3)6NpO2(C2O4)2·1.5H2O was studied. The structure consists of centrosymmetrical dimeric anions [NpO2(C2O4)2] 2 6− , [Co(NH3)6]3+ cations, and water molecules of crystallization. The NpO 2 + dioxocations have close Np-O bond lengths (average 1.824 A) and are noticeably bent (ONpO angle 175.6°). Each dioxocation in the [NpO2(C2O4)2] 2 6− anion is surrounded by five oxygen atoms of three C2O 4 2− anions; the Np coordination polyhedra are pentagonal bipyramids sharing a common edge.