Synthesis, crystal structure and ligand based catalytic activity of octahedral salen Schiff base Co(III) compounds

Two octahedral cobalt(III) compounds ([(CoLCN)-C-1(H2O)]-DMF (1) and [(CoLL3)-L-2] - H2O (2)) were synthesized by using two Schiff bases, H2L1 and H2L2 and are well-characterized by different spectral methods. Catalytic ability of the compounds were studied by the catecholase oxidation reaction. Among the two compounds, compound 2 with bare aldehydic type coligand catalysed the 3,5-di-tertiarybutylcatechol (3,5-DTBC) into corresponding quinone. Here, the nature of the ligand exhibited a significant role in the oxidation of the substrate. A catalytic loop is proposed to explain the mechanistic aspect of the reaction and different kinetic parameters (V-max (3.31 x 10(-3) M) and K-M (3.43 x 10(-3) M mM(-1)) were also determined. (C) 2020 Elsevier B.V. All rights reserved.