“…For this reason, interest in the synthesis of Mn ion complexes to study their structural, chemical, electrochemical and oxidative properties has developed and continues to grow [5][6][7]. However, the problems of separating the catalyst from the reaction products and regenerating its active form are causing research to shift from homogeneous catalysis toward heterogeneous catalysis and electrocatalysis [8][9][10][11][12][13][14]. Catalysts are immobilized in inorganic materials [10] and in polymers [11,12].…”