Electrocatalytic oxidation of organic substrates with oxygen using ruthenium—Schiff base complex

Synthesis, Characterization, and Electrochemical Study of Tetradentate Ruthenium‐Schiff Base Complexes: Dioxygen Activation with a Cytochrome P450 Model Using 1‐ or 2‐Methylimidazole as Axial Bases

“…As soon as these superoxo species are produced, the electrophilic intermediates (i.e., C 6 H 5 -CO + ) react faster to produce the metal-oxo species [6,21,47]. Of course, an important enhancement of the two cathodic peak currents I pc (O 2 ) was observed at each one of the both reduction waves E pc1 and E pc2 as previously indicated.…”

“…Benzoic anhydride reacts with superoxo intermediates, giving an oxo compound with elimination of one oxygen atom according to the following equation [6,21,36,47]:…”

“…During the last decade, the tetradentate Schiff base complexes of transition metals have been extensively studied mainly with manganese, iron, cobalt, copper, and nickel [1][2][3][4][5] while those of ruthenium are relatively less studied [6]. Thus, it was demonstrated that such materials might be involved in several applications such as in catalysis [7] or electrocatalysis [8] by activating many small molecules like carbon dioxide [9] or molecular oxygen [10].…”

“…In some steps, molecular dioxygen fixation, water elimination, and peroxo high oxidation state metal (i.e., Fe IV ) and so forth, are involved In all cases, the active form of the coordinated iron ion is axially linked to a sulfur protein. Therefore, a large number of cytochrome P450 oxocomplexes, including the nonporphyrinic ligands such as Schiff base complexes, have been tested for their catalytic activity [13][14][15][16][17] and their electrocatalytic properties [8,[17][18][19][20][21][22][23][24][25][26]. Thus, new catalysts deriving from symmetrical tetradentate ruthenium-Schiff base complexes seem to be more and more attractive and efficient in catalysis [27,28].…”

“…Thus, new catalysts deriving from symmetrical tetradentate ruthenium-Schiff base complexes seem to be more and more attractive and efficient in catalysis [27,28]. These new electrocatalytic systems have been less studied than those currently applied in catalysis [6].…”