A note on the stoichiometric mechanism for ligand replacement reactions of square-planar complexes of platinum(II)

Based on available evidence in literature, particularly insensitivity of the rate on the overall charge on the complex, ligand replacement reactions of square-planar complexes of platinum(II) are best regarded as interchange (1) process in which bond formation and bond dissociation make comparable contributions in generating the transition state. But for isoelectronic gold(III) the reactions are associative (A).