ELECTROCHEMICAL PROPERTIES OF BIS(DICARBOLLIDE)URANIUM DIBROMIDE

The cyclic voltammogram of [(eta(5)-C2B9H11)(2)UBr2]. 2[Li(THF4)] show s the electrochemical generation of a uranium-(III) species. Subsequen t Na/Hg reduction of [(eta(5)-C2B9H11)(2)UBr2]. 2[Li(THF4)] leads to t he new isolable uranium(III) species [(eta(5)-C2B9H11)(2)UBr(THF)]. 2[ Li(THF)(x)] (x = 2-4). The green uranium(III) complex was characterize d by NMR and elemental analysis and its structure determined by single -crystal X-ray crystallography. The coordination geometry around the d inegative uranium(III) moiety is pseudotetrahedral with two dicarbolli de ligands, a bromide ligand, and a THF ligand. The electrochemical pr operties of the dicarbollide complex are discussed and compared to sim ilar cyclopentadienyluranium complexes.