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.