CONFORMATIONAL ISOMERS OF N,N'-BIS-SALICYLIDENE-1,5-DIAMINO-3-OXAPENTANE-DIOXOURANIUM(VI) - 2 EXAMPLES OF COMPOUNDS CONTAINING BENT URANYL GROUPS

The title compound (saloden UO2) has been prepared and isolated in two crystalline modifications α and β. The α form crystallizes in orthorhombic system space group P212121 with a = 24.183(14), b = 10.525(7), c = 7.110(4) A ̊, Z = 4; the β form has the same space group wti a = 23.348(12), b = 11.786(6), c = 6.586(4), Z = 4. In both modifications the coordination geometry of the uranium atoms is a pentagonal bipyramid with the pentadentate ligand coordinated in a plane normal to the uranyl group. The compounds may be considered as conformational isomers differing mainly in the spatial arrangement of the ethylenic chains. The uranyl group is non-linear in both forms. A further species incorporating a chloroform molecule of solvation has been prepared. The IR and Raman spectral data are also reported and discussed. © 1978.