Spectral, kinetic and thermodynamic studies of Pd (II) with Schiff base derived from L-asparagine and furfuraldehyde in the presence of 8-hydroxyquinoline

Abstract

In this study, a Pd (II) complex of the type [Pd(L1)(L2)] (where L1: Schiff base derived from L-asparagine and furfuraldehyde; L2: 8-hydoxyquinoline) was synthesized and characterised using elemental analysis, magnetic moment, conductivity, ESI-MS, UV-Visible, FT-IR, 1H NMR, 13C NMR, XRD, SEM, EDX, and TG-DTA. The reaction conditions were determined as pH 7 and λ = 465 nm. When the reaction kinetics were examined, the rate formula was found to be v = k [Pd2+][L1]1/2[L2]1/2 and k = 2.51 × 10−3 lmol−1s−1. The activation energy (Ea) and Arrhenius constant (A) were calculated from the Arrhenius equation as 3.107 kJmol−1 and 5.38 × 10−5 s−1, respectively. Thermodynamic parameters, enthalpy, ∆H (kJmol−1), entropy, ∆S (Jmol−1), Gibbs free energy, ∆G (kJmol−1) and equilibrium constant, Ke, were determined at temperatures of 293.2, 313.2, 333.2 and 353.2 K. According to the thermodynamic parameters, the reaction was a non-spontaneous process. In addition, catalytic ability of the complex was investigated and it was observed that the complex could effectively catalyse epoxidation of cis-1,2-diphenylethylene with meta-chloroperoxybenzoic acid.