Crystal and molecular structure of tris(dimethyl sulphoxide)trinitratoytterbium

Abstract

The title complex crystallises in the monoclinic space group P2₁/c with Z=4 in a unit cell of dimensions a=10.08 (2), b=12.74(2), c=16.02(2)Å, and β=100.5(3)°. The structure was solved by the heavy-atom method and refined by three-dimensional least-squares procedures, from 2172 visually estimated independent reflections, to R 0.078. The ytterbium is co-ordinated by nine oxygen atoms which form a tricapped trigonal prism. The three dmso oxygen atoms occupy a triangular face of the trigonal prism while the six oxygen atoms from the three nitrate groups occupy the remaining sites. The Yb-O distances are 2.23-2.48 Å. All three nitrate groups are bidentate. The sulphur atom of one dmso group is disordered.