New Dioxouranium(VI) Complexes of Tridentate Schiff Bases Derived from o−Cresotic Acid Hydrazide and Various Aldehydes/Ketones

Abstract

Six new dioxouranium(VI) complexes of the type trans−UO₂L·CH₃OH, where LH₂ = a Schiff base derived from o−cresotic acid hydrazide and salicylaldehyde, 5-chlorosalicylaldehyde, 2-hydroxy-1-naphthaldehyde, o−hydroxyacetophenone, o−hydroxybenzophenone and pyridoxal, have been synthesized and characterized on the basis of elemental analysis, molecular weight, conductance, magnetic susceptibility, IR, NMR and electronic spectral measurements. The complexes are non-electrolytes, monomers, diamagnetic and six-coordinated. The Schiff bases behave as dibasic tridentate ligands and coordinate through the phenolic oxygen, azomethine nitrogen and enolic oxygen atoms. The complexes have a trans−O=U=O structure and show a strong and broad band at 21000–23000 cm⁻¹ due to the 1σ⁺ _g––> 3πu transition.