Abstract
The reactions of four β-diketonatoruthenium(III) complexes in the presence of HNO3 andp-MeC6H4SO3H in the 45° and 57° range were followed spectrophotometrically in Me2CO∶H2O mixtures. Dissociation of Ru(acac)3 follows [H+]-dependent and [H+]2-dependent paths, whereas the bzac and F3acacF3 complexes follow only the [H+]-dependent path. The bzbz (Dibenzoylmethanate) complex is inert. Protonation of the bound ligand leads to its rupture from the metal ion. The bzac complex is kinetically more inert than the acac complex, because of extra stability arising from interaction of the (bzac) benzene ring with the pseudo-aromatic diketonate ring of the complex. Considering the kinetic labilities, the complexes may be arranged in the order Ru(F3acacF3)3>Ru(acac)3>Ru(bzac)3>Ru(bzbz)3.
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