Model of the crystal structure of Np(VI) sulfate with dimethyl sulfoxide, NpO2SO4 ⋅ 2SO(CH3)2 ⋅ H2O

Abstract

A new complex compound, neptunium(VI) sulfate, was grown from aqueous solutions and studied by the methods of X-ray structure analysis. The model of the crystal structure was determined by direct methods within the sp. gr. P21 and was refined in the anisotropic approximation (R = 6.2%, 1044 independent reflections). The structure is built by tetragonal and hexagonal Np bipyramids. A hexagonal bipyramid can be considered as a polyhedron derived from a pentagonal bipyramid, in which one equatorial O atom is replaced by two atoms located above and below the equatorial plane. The polyhedra are linked in chains through S-tetrahedra. The chains are linked into a three-dimensional framework by hydrogen bonds with the participation of DMSO groups.