Pyrano[2,3-c]pyrazole ligand and their transition metal complex with nickel (Ni II MPC) were synthesized and characterization by elemental analyses, magnetic susceptibility, FT IR, UV-Vis, and mass spectroscopy. Complex have been investigated as functional models for catechol oxidase activity by using a catechol as a model substrate. According to the kinetic measurement results, the rate of catechol oxidation follows first order kinetics. Nickel complex has been used in homogenous oxidation of catechol in presence of a green oxidant H 2 O 2. kinetic parameters were obtained V max = 2.
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