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Reactivity of Neutral Nitrogen Donors in Planar d8 Metal Complexes. Part 1. The System <1,2-Bis(phenylsulfanyl)-ethane>dichloroplatinum(II) with Pyridines in Methanol. Effect of Basicity and Steric Hindrance
The kinetics of the forward and reverse steps of the process + am <-/-> (+) + Cl(-) (am = one of a number of pyridines and other heterocyclic nitrogen bases covering a wide range of basicity) has been studied in methanol at 25 deg C.Both forward and reverse reactions obey the usual two-term rate law observed in square-planar substitution.The second-order rate constants for the forward reactions, k2f, show only a slight dependence upon the nature of the entering pyridine, and steric hindrance due to the presence of one or two methyl groups in alpha position to the nitrogen markedly decreases the reactivity.The first- and second-order rate constants for the reverse reaction are very sensitive to the basicity of the leaving group and a plot of log k2r against the pKa of the conjugate acids of unhindered pyridines is linear with a slope of -0.56.Steric retardation for monosubstituted alpha-methylpyridines is relatively small.The equilibrium constants for these reactions have been determined from the ratio of the rate constants and a plot of log K against the pKa of the unhindered pyridines is linear with a slope of 0.58.The results are compared with data from the literature and discussed in terms of the reaction profile.
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Reference：
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis