Abstract
Picolinic acid (picH) reacts with [Pd(α-/β-NaiR)Cl 2] [α-/β-NaiR = 1-alkyl-2-(naphthyl-α-/β-azo)imidazole] in acetonitrile (MeCN) medium to give [Pd(α-/β-NaiR)(pic)](ClO 4). The products are characterized by spectroscopic techniques (FT-IR, UV–Vis, NMR). The reaction kinetics show first order dependence of rate on each of the concentration of Pd(II) complex and picH. Addition of LiCl to the reaction decreases the rate of reaction and has proved the cleavage of Pd–Cl bond at the rate-determining step. Thermodynamic parameters (Δ ‡ H° and Δ ‡ S°) are determined from variable temperature kinetic studies. The magnitude of the second order rate constant, k 2 increases as in the order: Pd(NaiEt)Cl 2 < Pd(NaiMe)Cl 2 < Pd(NaiBz)Cl 2 as well as Pd(β-NaiR)Cl 2 < Pd(α-NaiR)Cl 2.
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