The kinetics and mechanism of the electrochemical redox reaction of 3-(3,5-dimethilpirazole-1-yl)-6-R-1,2,4,5-tetrazines and their Cu(II), Co(II), and Ni(II) complexes were studied by voltammetry on glassy carbon electrodes in aqueous acetonitrile. The characteristics of electrode processes in the studied systems were determined. © 2023, Pleiades Publishing, Ltd.