ANION-CATALYZED HETEROLYSIS OF CHROMIUM-CARBON SIGMA-BONDS - EFFECT OF DIFFERENT ANIONS, TEMPERATURE, AND PRESSURE

The anion-catalyzed heterolysis reaction of (H2O)5CrC(CH3)2OH2+ was st udied as a function of anion concentration, temperature, and pressure for a series of 10 different organic and inorganic oxy anions, for whi ch the pK(a) values range between 0 and 7. The reported rate data indi cate that the catalytic effect increases with basicity of the anion. T he volumes of activation for the catalyzed heterolysis reactions are a ll significantly positive and support the operation of a dissociativel y activated heterolysis mechanism. The results are discussed in refere nce to related data reported in the literature.