Synthesis and crystal structure of (N-2-oxyphenylsalicylaldiminato) bis(dimethylsulphoxide)dioxouranium(VI)

Two compounds, UO2A·2dmso and UO2A·dmso· H2O (A = N-2-oxyphenylsalicylaldiminato) have been synthesized and characterized, and the X-ray crystal structure of the former has been determined from diffractometer data. The substance crystallizes in the monoclinic system, space group P21/n, with a = 20.76(2), b = 8.10(2), c = 12.98(2) Å, and β = 96.84(4)°, Z = 4. The final conventional R was 0.073, In this compound the U atom is at the centre of a distorted pentagonal bipyramid whos apexs are occupied by the O atoms of the linear uranyl group. The ligand has a chair-like configuration. The UO(A) bond distances (2.20 and 2.19 Å) are shorter than the UO(dmso) ones (2.43 Å); whereas the nitrogen atom, which is significantly displaced from the equatorial plane, makes with the metal atom a rather long bond (2.73 Å). The structure is partially disordered