MONOMER, MU-OXO DIMER, DI(MU-OXO) DIMER INTERCONVERSION OF NITRIDOTECHNETIUM(VI) COMPLEXES IN SOLUTION

The interconversion of monomeric and mu-oxo and di(mu-oxo) dimeric nit ridotechnetium(VI) species in solution has been studied by ESR and UV- Vis spectrophotometry. High acidity and the presence of coordinating a nions favour the monomeric form. In very weakly coordinating acids the mu-oxo and di(mu-oxo) aquanitrido cations have been identified. (AsPh (4))(2)[{TcNX(2)}(2)(mu O)(2)] (X = Cl, Br) have been prepared and the chloro complex shown to be a useful starting material for the prepara tion of di(mu-oxo) dimers by substitution.