Tripodal Tris(siloxide) Ligand Supported Trivalent Rare-earth Metal Complexes and Redox Reactivity

Tripodal tris(siloxide) ligand supported rare-earth metal complexes LLn(III) (Ln = Ce, Pr, Tb, Y, Lu) were synthesized. The Ce(III) complex was oxidized with [N(CHBr)][SbCl] to a Ce(IV) chloride complex, which reacted with BuONa to form a Ce(IV) -butoxide complex, one displaying a reduction potential cathodically shifted relative to that of Ce(IV) chloride complex.