Ligand Effects on the Rate and Mechanism of Solvent Exchange at Rhodium(III) and Iridium(III)

Abstract

The rate constants and activation parameters for solvent exchange for a series of Rh^III and Ir^III complexes of the form [M(H₂O)₆]³⁺ (M = Rh or Ir) and [Cp*M(S)₃]²⁺ (M = Rh or Ir, and S = H₂O, MeCN, or Me₂SO) have been determined by NMR spectroscopy as a function of free-solvent concentration, temperature, and pressure, and the mechanisms for the respective exchange processes have been inferred.