SYNTHESIS OF CATIONIC URANIUM-COMPOUNDS BY PROTONOLYSIS OF AMIDE PRECURSORS - AMIDE AND CHLOROAMIDE COMPLEXES

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