Abstract
Crystal structure of Np[S2CN(C2H5)2]4 has been determined. The environment of the Np atom is formed by eight sulfur atoms. The coordination polyhedron of the Np atom is a dodecahedron. The Np-S bond lengths vary from 2.782(2) to 2.812(2) A (average 2.795 A). Two independent (H5C2)2NCS 2 − anions are characterized by different orientations of the diethylcarbamate fragments. A comparison of the geometric characteristics of the coordination polyhedra of the compounds An[S2CN(C2H5)2]4 (An = Th, Np) and Np(S2CN(C2H5)2)4][N(C2H5)4 shows that the average Np-S bond lengths in the coordination polyhedra decrease by the same value on going from Th4+ to Np4+ and from Np3+ to Np4+.
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