Synthesis and crystal structure of [U(η-C 5Me 5) 2(OC 4H 8) 2][BPh 4], the first cationic cyclopentadienyl compound of uranium(III)

Abstract

The mixed amide complexes [U(NEt 2) 2(N{SiMe 3} 2) 2] and [U(η-C 8H 8)(NEt 2)(N{SiMe 3} 2)] reacted in tetrahydrofuran (THF) with NEt 3HBPh 4 to give the cations [U(NEt 2)(N{SiMe 3} 2) 2(THF) x ] + and [U(η-C 8H 8)(N{SiMe 3} 2)(THF) x ] +. The bis(trimethylsilyl) amide complex [U(η-C 5Me 5) 2(N{SiMe 3} 2)] was inert towards NEt 3HBPh 4 but its treatment with NH 4BPh 4 afforded the cationic uranium(III) compound [U(η-C 5Me 5) 2(THF) 2][BPh 4], the crystal structure of which has been determined.