Synthesis of cationic uranium compounds by protonolysis of amide precursors: amide and chloroamide complexes

Abstract

The chloroamide compounds [U(NEt₂)Cl₃(thf)] and [U(NEt₂)₂Cl₂] were isolated from the comproportionation reactions of [U(NEt₂)₄] and UCl₄ in tetrahydrofuran (thf) and were converted respectively into the cationic derivatives [UCl₃(thf)₂]BPh₄ and [U(NEt₂)Cl₂(thf)₂]BPh₄ by treatment with NHEt₃BPh₄. Protonolysis of [U(NEt₂)₄] afforded the monocation [U(NEt₂)₃]⁺ which was itself transformed into the dication [U(NEt₂)₂(thf)₃]²⁺; the crystal structures of [U(NEt₂)₃(thf)₃]BPh₄ and [U(NEt₂)₂(py)₅][BPh₄]₂·1.5py (py = pyridine) have been determined.