Uranium(VI), Thorium(IV) and Scandium(III) Complexes of Tropolone

Abstract

<p> New complexes formed between U(VI), Th(IV) and Sc(III) and tropolone have been prepared. These include the solvates UO2T2⋅X and ThT4⋅X (T = the tropolone anion; X =H2O and CH3OH), and the unsolvated chelate Sc3⋅. Some U(VI), Th(IV) and Sc(III) tropolonates reported in the literature have been re-examined and found to be incorrectly formulated.</p> <p> The adduct chelates UO2T2⋅HT, ScT3⋅HT and the previously unreported ThT4⋅HT have been prepared. Evidence has been presented for hydrogen-bonding in the additional monodentate tropolone ligand.</p> <p> The thermal conversion of the above solvates and adducts to yield UO2T2, ThT4 and ScT3 has been described.</p> <p> The ability of tropolone and other bidentate ligands to displace the water molecule in UO2T2⋅H2O and ThT4⋅H2O, and the addition of such ligands to ScT3, has been studied.</p>