Rates and mechanisms of substitution reactions of platinum dithiolato-complexes

Abstract

Kinetics and mechanisms of substitution reactions of square-planar platinum(II) dithiolato-complexes [Pt(S–S)₂]^2–[S–S^2–=(NC)₂C:CS₂^2–(cet), S(NC)C:C(NC)S^2–(ct), NO₂CH:CS₂^2–(net), S(O)C:C(O)S^2–(dta), NC–N:CS₂^2–(cimd), and NC(Ph)C:CS₂^2–(npet)], with both uni- and bi-dentate nucleophiles have been studied in aqueous solution. The reactions are second order, first order in substrate and first order in nucleophile. Activation parameters have been measured for a number of the reactions. The results permit a comparison of the reaction mechanisms and relative reactivities of dithiolato-complexes of nickel, palladium, and platinum.