Relative Kinetic Stability of Cerium(IV) Complexes with Some Organic Compounds of the Aliphatic Series

A quantitative criterion of the kinetic stabilization of unstable metal oxidation states during complexation has been proposed on the basis of the of a comparative analysis of the stability constants β1yn and rate constants kn = 1 of intramolecular redox decomposition of cerium(IV) complexes [CeHyLn]4+y–nk with a number of aliphatic organic compounds (L = HkR, R(OH)k) in sulfate and nitrate media, as well as established correlations between log kn = 1 and log β1yn. This criterion is defined as the relative kinetic stability of the complexes to intramolecular redox decomposition –log (kn = 1/k0n = 1) determined from the log kn = 1–log β1yn correlations. The latter have been found to associeted with the Nernst equation.