SYNTHESIS AND CHARACTERIZATION OF AQUO[N,N'-ETHYLENEBIS (3-ETHOXYSALICYLIDENEAMINATO)]DIOXOURANIUM(VI)

The synthesis, spectra and structure of [UO2(3-EtOsalen) (H2O)] . H2O [where (3-EtOsalen) is the Schiff base N,N'-ethylenebis(3-ethoxysalicy lidieniminato)] are reported. The IR spectra and H-1 and C-13 NMR spec tra of the free ligand and the uranyl complex were recorded. Assignmen t of the IR bands and NMR chemical shifts are given. Four bands were o bserved for the complex, 455, 396, 341 and 267 nm in acetonitrile and 472, 396, 345 and 269 nm in dimethyl sulphoxide. The weak bands at 455 and 472 nm are assigned to the (1)E --> (2) pi(u) transition. The UO 22+ ion is coordinated to two nitrogen,and two oxygen atoms of the lig and, with a water molecule completing the characteristic seven-coordin ate, pentagonal-bipyramidal geometry. Another water molecule completes the crystal structure and is involved in several intra- and intermole cular hydrogen bonds.